path: root/target/linux/ramips/patches-4.4/0039-mtd-add-mt7621-nand-support.patch

From 0e1c4e3c97b83b4e7da65b1c56f0a7d40736ac53 Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Sun, 27 Jul 2014 11:05:17 +0100
Subject: [PATCH 39/53] mtd: add mt7621 nand support

Signed-off-by: John Crispin <blogic@openwrt.org>
---
 drivers/mtd/nand/Kconfig            |    6 +
 drivers/mtd/nand/Makefile           |    1 +
 drivers/mtd/nand/bmt.c              |  750 ++++++++++++
 drivers/mtd/nand/bmt.h              |   80 ++
 drivers/mtd/nand/dev-nand.c         |   63 +
 drivers/mtd/nand/mt6575_typedefs.h  |  340 ++++++
 drivers/mtd/nand/mtk_nand.c         | 2304 +++++++++++++++++++++++++++++++++++
 drivers/mtd/nand/mtk_nand.h         |  452 +++++++
 drivers/mtd/nand/nand_base.c        |    6 +-
 drivers/mtd/nand/nand_bbt.c         |   19 +
 drivers/mtd/nand/nand_def.h         |  123 ++
 drivers/mtd/nand/nand_device_list.h |   55 +
 drivers/mtd/nand/partition.h        |  115 ++
 13 files changed, 4311 insertions(+), 3 deletions(-)
 create mode 100644 drivers/mtd/nand/bmt.c
 create mode 100644 drivers/mtd/nand/bmt.h
 create mode 100644 drivers/mtd/nand/dev-nand.c
 create mode 100644 drivers/mtd/nand/mt6575_typedefs.h
 create mode 100644 drivers/mtd/nand/mtk_nand.c
 create mode 100644 drivers/mtd/nand/mtk_nand.h
 create mode 100644 drivers/mtd/nand/nand_def.h
 create mode 100644 drivers/mtd/nand/nand_device_list.h
 create mode 100644 drivers/mtd/nand/partition.h

--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -546,4 +546,10 @@ config MTD_NAND_HISI504
 	help
 	  Enables support for NAND controller on Hisilicon SoC Hip04.
 
+config MTK_MTD_NAND
+	tristate "Support for MTK SoC NAND controller"
+	depends on SOC_MT7621
+	select MTD_NAND_IDS
+	select MTD_NAND_ECC
+
 endif # MTD_NAND
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -55,5 +55,6 @@ obj-$(CONFIG_MTD_NAND_BCM47XXNFLASH)	+=
 obj-$(CONFIG_MTD_NAND_SUNXI)		+= sunxi_nand.o
 obj-$(CONFIG_MTD_NAND_HISI504)	        += hisi504_nand.o
 obj-$(CONFIG_MTD_NAND_BRCMNAND)		+= brcmnand/
+obj-$(CONFIG_MTK_MTD_NAND)                      += mtk_nand.o bmt.o
 
 nand-objs := nand_base.o nand_bbt.o nand_timings.o
--- /dev/null
+++ b/drivers/mtd/nand/bmt.c
@@ -0,0 +1,750 @@
+#include "bmt.h"
+
+typedef struct
+{
+    char signature[3];
+    u8 version;
+    u8 bad_count;               // bad block count in pool
+    u8 mapped_count;            // mapped block count in pool
+    u8 checksum;
+    u8 reseverd[13];
+} phys_bmt_header;
+
+typedef struct
+{
+    phys_bmt_header header;
+    bmt_entry table[MAX_BMT_SIZE];
+} phys_bmt_struct;
+
+typedef struct
+{
+    char signature[3];
+} bmt_oob_data;
+
+static char MAIN_SIGNATURE[] = "BMT";
+static char OOB_SIGNATURE[] = "bmt";
+#define SIGNATURE_SIZE      (3)
+
+#define MAX_DAT_SIZE        0x1000
+#define MAX_OOB_SIZE        0x80
+
+static struct mtd_info *mtd_bmt;
+static struct nand_chip *nand_chip_bmt;
+#define BLOCK_SIZE_BMT          (1 << nand_chip_bmt->phys_erase_shift)
+#define PAGE_SIZE_BMT           (1 << nand_chip_bmt->page_shift)
+
+#define OFFSET(block)       ((block) * BLOCK_SIZE_BMT)  
+#define PAGE_ADDR(block)    ((block) * BLOCK_SIZE_BMT / PAGE_SIZE_BMT)
+
+/*********************************************************************
+* Flash is splited into 2 parts, system part is for normal system    *
+* system usage, size is system_block_count, another is replace pool  *
+*    +-------------------------------------------------+             *
+*    |     system_block_count     |   bmt_block_count  |             *
+*    +-------------------------------------------------+             *
+*********************************************************************/
+static u32 total_block_count;   // block number in flash
+static u32 system_block_count;
+static int bmt_block_count;     // bmt table size
+// static int bmt_count;               // block used in bmt
+static int page_per_block;      // page per count
+
+static u32 bmt_block_index;     // bmt block index
+static bmt_struct bmt;          // dynamic created global bmt table
+
+static u8 dat_buf[MAX_DAT_SIZE];
+static u8 oob_buf[MAX_OOB_SIZE];
+static bool pool_erased;
+
+/***************************************************************
+*                                                              
+* Interface adaptor for preloader/uboot/kernel                 
+*    These interfaces operate on physical address, read/write
+*       physical data.
+*                                                              
+***************************************************************/
+int nand_read_page_bmt(u32 page, u8 * dat, u8 * oob)
+{
+    return mtk_nand_exec_read_page(mtd_bmt, page, PAGE_SIZE_BMT, dat, oob);
+}
+
+bool nand_block_bad_bmt(u32 offset)
+{
+    return mtk_nand_block_bad_hw(mtd_bmt, offset);
+}
+
+bool nand_erase_bmt(u32 offset)
+{
+    int status;
+    if (offset < 0x20000)
+    {
+        MSG(INIT, "erase offset: 0x%x\n", offset);
+    }
+
+    status = mtk_nand_erase_hw(mtd_bmt, offset / PAGE_SIZE_BMT); // as nand_chip structure doesn't have a erase function defined
+    if (status & NAND_STATUS_FAIL)
+        return false;
+    else
+        return true;
+}
+
+int mark_block_bad_bmt(u32 offset)
+{
+    return mtk_nand_block_markbad_hw(mtd_bmt, offset);   //mark_block_bad_hw(offset);
+}
+
+bool nand_write_page_bmt(u32 page, u8 * dat, u8 * oob)
+{
+    if (mtk_nand_exec_write_page(mtd_bmt, page, PAGE_SIZE_BMT, dat, oob))
+        return false;
+    else
+        return true;
+}
+
+/***************************************************************
+*                                                              *
+* static internal function                                     *
+*                                                              *
+***************************************************************/
+static void dump_bmt_info(bmt_struct * bmt)
+{
+    int i;
+
+    MSG(INIT, "BMT v%d. total %d mapping:\n", bmt->version, bmt->mapped_count);
+    for (i = 0; i < bmt->mapped_count; i++)
+    {
+        MSG(INIT, "\t0x%x -> 0x%x\n", bmt->table[i].bad_index, bmt->table[i].mapped_index);
+    }
+}
+
+static bool match_bmt_signature(u8 * dat, u8 * oob)
+{
+
+    if (memcmp(dat + MAIN_SIGNATURE_OFFSET, MAIN_SIGNATURE, SIGNATURE_SIZE))
+    {
+        return false;
+    }
+
+    if (memcmp(oob + OOB_SIGNATURE_OFFSET, OOB_SIGNATURE, SIGNATURE_SIZE))
+    {
+        MSG(INIT, "main signature match, oob signature doesn't match, but ignore\n");
+    }
+    return true;
+}
+
+static u8 cal_bmt_checksum(phys_bmt_struct * phys_table, int bmt_size)
+{
+    int i;
+    u8 checksum = 0;
+    u8 *dat = (u8 *) phys_table;
+
+    checksum += phys_table->header.version;
+    checksum += phys_table->header.mapped_count;
+
+    dat += sizeof(phys_bmt_header);
+    for (i = 0; i < bmt_size * sizeof(bmt_entry); i++)
+    {
+        checksum += dat[i];
+    }
+
+    return checksum;
+}
+
+
+static int is_block_mapped(int index)
+{
+    int i;
+    for (i = 0; i < bmt.mapped_count; i++)
+    {
+        if (index == bmt.table[i].mapped_index)
+            return i;
+    }
+    return -1;
+}
+
+static bool is_page_used(u8 * dat, u8 * oob)
+{
+    return ((oob[OOB_INDEX_OFFSET] != 0xFF) || (oob[OOB_INDEX_OFFSET + 1] != 0xFF));
+}
+
+static bool valid_bmt_data(phys_bmt_struct * phys_table)
+{
+    int i;
+    u8 checksum = cal_bmt_checksum(phys_table, bmt_block_count);
+
+    // checksum correct?
+    if (phys_table->header.checksum != checksum)
+    {
+        MSG(INIT, "BMT Data checksum error: %x %x\n", phys_table->header.checksum, checksum);
+        return false;
+    }
+
+    MSG(INIT, "BMT Checksum is: 0x%x\n", phys_table->header.checksum);
+
+    // block index correct?
+    for (i = 0; i < phys_table->header.mapped_count; i++)
+    {
+        if (phys_table->table[i].bad_index >= total_block_count || phys_table->table[i].mapped_index >= total_block_count || phys_table->table[i].mapped_index < system_block_count)
+        {
+            MSG(INIT, "index error: bad_index: %d, mapped_index: %d\n", phys_table->table[i].bad_index, phys_table->table[i].mapped_index);
+            return false;
+        }
+    }
+
+    // pass check, valid bmt.
+    MSG(INIT, "Valid BMT, version v%d\n", phys_table->header.version);
+    return true;
+}
+
+static void fill_nand_bmt_buffer(bmt_struct * bmt, u8 * dat, u8 * oob)
+{
+    phys_bmt_struct phys_bmt;
+
+    dump_bmt_info(bmt);
+
+    // fill phys_bmt_struct structure with bmt_struct
+    memset(&phys_bmt, 0xFF, sizeof(phys_bmt));
+
+    memcpy(phys_bmt.header.signature, MAIN_SIGNATURE, SIGNATURE_SIZE);
+    phys_bmt.header.version = BMT_VERSION;
+    // phys_bmt.header.bad_count = bmt->bad_count;
+    phys_bmt.header.mapped_count = bmt->mapped_count;
+    memcpy(phys_bmt.table, bmt->table, sizeof(bmt_entry) * bmt_block_count);
+
+    phys_bmt.header.checksum = cal_bmt_checksum(&phys_bmt, bmt_block_count);
+
+    memcpy(dat + MAIN_SIGNATURE_OFFSET, &phys_bmt, sizeof(phys_bmt));
+    memcpy(oob + OOB_SIGNATURE_OFFSET, OOB_SIGNATURE, SIGNATURE_SIZE);
+}
+
+// return valid index if found BMT, else return 0
+static int load_bmt_data(int start, int pool_size)
+{
+    int bmt_index = start + pool_size - 1;  // find from the end
+    phys_bmt_struct phys_table;
+    int i;
+
+    MSG(INIT, "[%s]: begin to search BMT from block 0x%x\n", __FUNCTION__, bmt_index);
+
+    for (bmt_index = start + pool_size - 1; bmt_index >= start; bmt_index--)
+    {
+        if (nand_block_bad_bmt(OFFSET(bmt_index)))
+        {
+            MSG(INIT, "Skip bad block: %d\n", bmt_index);
+            continue;
+        }
+
+        if (!nand_read_page_bmt(PAGE_ADDR(bmt_index), dat_buf, oob_buf))
+        {
+            MSG(INIT, "Error found when read block %d\n", bmt_index);
+            continue;
+        }
+
+        if (!match_bmt_signature(dat_buf, oob_buf))
+        {
+            continue;
+        }
+
+        MSG(INIT, "Match bmt signature @ block: 0x%x\n", bmt_index);
+
+        memcpy(&phys_table, dat_buf + MAIN_SIGNATURE_OFFSET, sizeof(phys_table));
+
+        if (!valid_bmt_data(&phys_table))
+        {
+            MSG(INIT, "BMT data is not correct %d\n", bmt_index);
+            continue;
+        } else
+        {
+            bmt.mapped_count = phys_table.header.mapped_count;
+            bmt.version = phys_table.header.version;
+            // bmt.bad_count = phys_table.header.bad_count;
+            memcpy(bmt.table, phys_table.table, bmt.mapped_count * sizeof(bmt_entry));
+
+            MSG(INIT, "bmt found at block: %d, mapped block: %d\n", bmt_index, bmt.mapped_count);
+
+            for (i = 0; i < bmt.mapped_count; i++)
+            {
+                if (!nand_block_bad_bmt(OFFSET(bmt.table[i].bad_index)))
+                {
+                    MSG(INIT, "block 0x%x is not mark bad, should be power lost last time\n", bmt.table[i].bad_index);
+                    mark_block_bad_bmt(OFFSET(bmt.table[i].bad_index));
+                }
+            }
+
+            return bmt_index;
+        }
+    }
+
+    MSG(INIT, "bmt block not found!\n");
+    return 0;
+}
+
+/*************************************************************************
+* Find an available block and erase.                                     *
+* start_from_end: if true, find available block from end of flash.       *
+*                 else, find from the beginning of the pool              *
+* need_erase: if true, all unmapped blocks in the pool will be erased    *
+*************************************************************************/
+static int find_available_block(bool start_from_end)
+{
+    int i;                      // , j;
+    int block = system_block_count;
+    int direction;
+    // int avail_index = 0;
+    MSG(INIT, "Try to find_available_block, pool_erase: %d\n", pool_erased);
+
+    // erase all un-mapped blocks in pool when finding avaliable block
+    if (!pool_erased)
+    {
+        MSG(INIT, "Erase all un-mapped blocks in pool\n");
+        for (i = 0; i < bmt_block_count; i++)
+        {
+            if (block == bmt_block_index)
+            {
+                MSG(INIT, "Skip bmt block 0x%x\n", block);
+                continue;
+            }
+
+            if (nand_block_bad_bmt(OFFSET(block + i)))
+            {
+                MSG(INIT, "Skip bad block 0x%x\n", block + i);
+                continue;
+            }
+//if(block==4095)
+//{
+//  continue;
+//}
+
+            if (is_block_mapped(block + i) >= 0)
+            {
+                MSG(INIT, "Skip mapped block 0x%x\n", block + i);
+                continue;
+            }
+
+            if (!nand_erase_bmt(OFFSET(block + i)))
+            {
+                MSG(INIT, "Erase block 0x%x failed\n", block + i);
+                mark_block_bad_bmt(OFFSET(block + i));
+            }
+        }
+
+        pool_erased = 1;
+    }
+
+    if (start_from_end)
+    {
+        block = total_block_count - 1;
+        direction = -1;
+    } else
+    {
+        block = system_block_count;
+        direction = 1;
+    }
+
+    for (i = 0; i < bmt_block_count; i++, block += direction)
+    {
+        if (block == bmt_block_index)
+        {
+            MSG(INIT, "Skip bmt block 0x%x\n", block);
+            continue;
+        }
+
+        if (nand_block_bad_bmt(OFFSET(block)))
+        {
+            MSG(INIT, "Skip bad block 0x%x\n", block);
+            continue;
+        }
+
+        if (is_block_mapped(block) >= 0)
+        {
+            MSG(INIT, "Skip mapped block 0x%x\n", block);
+            continue;
+        }
+
+        MSG(INIT, "Find block 0x%x available\n", block);
+        return block;
+    }
+
+    return 0;
+}
+
+static unsigned short get_bad_index_from_oob(u8 * oob_buf)
+{
+    unsigned short index;
+    memcpy(&index, oob_buf + OOB_INDEX_OFFSET, OOB_INDEX_SIZE);
+
+    return index;
+}
+
+void set_bad_index_to_oob(u8 * oob, u16 index)
+{
+    memcpy(oob + OOB_INDEX_OFFSET, &index, sizeof(index));
+}
+
+static int migrate_from_bad(int offset, u8 * write_dat, u8 * write_oob)
+{
+    int page;
+    int error_block = offset / BLOCK_SIZE_BMT;
+    int error_page = (offset / PAGE_SIZE_BMT) % page_per_block;
+    int to_index;
+
+    memcpy(oob_buf, write_oob, MAX_OOB_SIZE);
+
+    to_index = find_available_block(false);
+
+    if (!to_index)
+    {
+        MSG(INIT, "Cannot find an available block for BMT\n");
+        return 0;
+    }
+
+    {                           // migrate error page first
+        MSG(INIT, "Write error page: 0x%x\n", error_page);
+        if (!write_dat)
+        {
+            nand_read_page_bmt(PAGE_ADDR(error_block) + error_page, dat_buf, NULL);
+            write_dat = dat_buf;
+        }
+        // memcpy(oob_buf, write_oob, MAX_OOB_SIZE);
+
+        if (error_block < system_block_count)
+            set_bad_index_to_oob(oob_buf, error_block); // if error_block is already a mapped block, original mapping index is in OOB.
+
+        if (!nand_write_page_bmt(PAGE_ADDR(to_index) + error_page, write_dat, oob_buf))
+        {
+            MSG(INIT, "Write to page 0x%x fail\n", PAGE_ADDR(to_index) + error_page);
+            mark_block_bad_bmt(to_index);
+            return migrate_from_bad(offset, write_dat, write_oob);
+        }
+    }
+
+    for (page = 0; page < page_per_block; page++)
+    {
+        if (page != error_page)
+        {
+            nand_read_page_bmt(PAGE_ADDR(error_block) + page, dat_buf, oob_buf);
+            if (is_page_used(dat_buf, oob_buf))
+            {
+                if (error_block < system_block_count)
+                {
+                    set_bad_index_to_oob(oob_buf, error_block);
+                }
+                MSG(INIT, "\tmigrate page 0x%x to page 0x%x\n", PAGE_ADDR(error_block) + page, PAGE_ADDR(to_index) + page);
+                if (!nand_write_page_bmt(PAGE_ADDR(to_index) + page, dat_buf, oob_buf))
+                {
+                    MSG(INIT, "Write to page 0x%x fail\n", PAGE_ADDR(to_index) + page);
+                    mark_block_bad_bmt(to_index);
+                    return migrate_from_bad(offset, write_dat, write_oob);
+                }
+            }
+        }
+    }
+
+    MSG(INIT, "Migrate from 0x%x to 0x%x done!\n", error_block, to_index);
+
+    return to_index;
+}
+
+static bool write_bmt_to_flash(u8 * dat, u8 * oob)
+{
+    bool need_erase = true;
+    MSG(INIT, "Try to write BMT\n");
+
+    if (bmt_block_index == 0)
+    {
+        // if we don't have index, we don't need to erase found block as it has been erased in find_available_block()
+        need_erase = false;
+        if (!(bmt_block_index = find_available_block(true)))
+        {
+            MSG(INIT, "Cannot find an available block for BMT\n");
+            return false;
+        }
+    }
+
+    MSG(INIT, "Find BMT block: 0x%x\n", bmt_block_index);
+
+    // write bmt to flash
+    if (need_erase)
+    {
+        if (!nand_erase_bmt(OFFSET(bmt_block_index)))
+        {
+            MSG(INIT, "BMT block erase fail, mark bad: 0x%x\n", bmt_block_index);
+            mark_block_bad_bmt(OFFSET(bmt_block_index));
+            // bmt.bad_count++;
+
+            bmt_block_index = 0;
+            return write_bmt_to_flash(dat, oob);    // recursive call 
+        }
+    }
+
+    if (!nand_write_page_bmt(PAGE_ADDR(bmt_block_index), dat, oob))
+    {
+        MSG(INIT, "Write BMT data fail, need to write again\n");
+        mark_block_bad_bmt(OFFSET(bmt_block_index));
+        // bmt.bad_count++;
+
+        bmt_block_index = 0;
+        return write_bmt_to_flash(dat, oob);    // recursive call 
+    }
+
+    MSG(INIT, "Write BMT data to block 0x%x success\n", bmt_block_index);
+    return true;
+}
+
+/*******************************************************************
+* Reconstruct bmt, called when found bmt info doesn't match bad 
+* block info in flash.
+* 
+* Return NULL for failure
+*******************************************************************/
+bmt_struct *reconstruct_bmt(bmt_struct * bmt)
+{
+    int i;
+    int index = system_block_count;
+    unsigned short bad_index;
+    int mapped;
+
+    // init everything in BMT struct 
+    bmt->version = BMT_VERSION;
+    bmt->bad_count = 0;
+    bmt->mapped_count = 0;
+
+    memset(bmt->table, 0, bmt_block_count * sizeof(bmt_entry));
+
+    for (i = 0; i < bmt_block_count; i++, index++)
+    {
+        if (nand_block_bad_bmt(OFFSET(index)))
+        {
+            MSG(INIT, "Skip bad block: 0x%x\n", index);
+            // bmt->bad_count++;
+            continue;
+        }
+
+        MSG(INIT, "read page: 0x%x\n", PAGE_ADDR(index));
+        nand_read_page_bmt(PAGE_ADDR(index), dat_buf, oob_buf);
+        /* if (mtk_nand_read_page_hw(PAGE_ADDR(index), dat_buf))
+           {
+           MSG(INIT,  "Error when read block %d\n", bmt_block_index);
+           continue;
+           } */
+
+        if ((bad_index = get_bad_index_from_oob(oob_buf)) >= system_block_count)
+        {
+            MSG(INIT, "get bad index: 0x%x\n", bad_index);
+            if (bad_index != 0xFFFF)
+                MSG(INIT, "Invalid bad index found in block 0x%x, bad index 0x%x\n", index, bad_index);
+            continue;
+        }
+
+        MSG(INIT, "Block 0x%x is mapped to bad block: 0x%x\n", index, bad_index);
+
+        if (!nand_block_bad_bmt(OFFSET(bad_index)))
+        {
+            MSG(INIT, "\tbut block 0x%x is not marked as bad, invalid mapping\n", bad_index);
+            continue;           // no need to erase here, it will be erased later when trying to write BMT
+        }
+
+        if ((mapped = is_block_mapped(bad_index)) >= 0)
+        {
+            MSG(INIT, "bad block 0x%x is mapped to 0x%x, should be caused by power lost, replace with one\n", bmt->table[mapped].bad_index, bmt->table[mapped].mapped_index);
+            bmt->table[mapped].mapped_index = index;    // use new one instead.
+        } else
+        {
+            // add mapping to BMT
+            bmt->table[bmt->mapped_count].bad_index = bad_index;
+            bmt->table[bmt->mapped_count].mapped_index = index;
+            bmt->mapped_count++;
+        }
+
+        MSG(INIT, "Add mapping: 0x%x -> 0x%x to BMT\n", bad_index, index);
+
+    }
+
+    MSG(INIT, "Scan replace pool done, mapped block: %d\n", bmt->mapped_count);
+    // dump_bmt_info(bmt);
+
+    // fill NAND BMT buffer
+    memset(oob_buf, 0xFF, sizeof(oob_buf));
+    fill_nand_bmt_buffer(bmt, dat_buf, oob_buf);
+
+    // write BMT back
+    if (!write_bmt_to_flash(dat_buf, oob_buf))
+    {
+        MSG(INIT, "TRAGEDY: cannot find a place to write BMT!!!!\n");
+    }
+
+    return bmt;
+}
+
+/*******************************************************************
+* [BMT Interface]
+*
+* Description:
+*   Init bmt from nand. Reconstruct if not found or data error
+*
+* Parameter:
+*   size: size of bmt and replace pool
+* 
+* Return: 
+*   NULL for failure, and a bmt struct for success
+*******************************************************************/
+bmt_struct *init_bmt(struct nand_chip * chip, int size)
+{
+    struct mtk_nand_host *host;
+
+    if (size > 0 && size < MAX_BMT_SIZE)
+    {
+        MSG(INIT, "Init bmt table, size: %d\n", size);
+        bmt_block_count = size;
+    } else
+    {
+        MSG(INIT, "Invalid bmt table size: %d\n", size);
+        return NULL;
+    }
+    nand_chip_bmt = chip;
+    system_block_count = chip->chipsize >> chip->phys_erase_shift;
+    total_block_count = bmt_block_count + system_block_count;
+    page_per_block = BLOCK_SIZE_BMT / PAGE_SIZE_BMT;
+    host = (struct mtk_nand_host *)chip->priv;
+    mtd_bmt = &host->mtd;
+
+    MSG(INIT, "mtd_bmt: %p, nand_chip_bmt: %p\n", mtd_bmt, nand_chip_bmt);
+    MSG(INIT, "bmt count: %d, system count: %d\n", bmt_block_count, system_block_count);
+
+    // set this flag, and unmapped block in pool will be erased.
+    pool_erased = 0;
+    memset(bmt.table, 0, size * sizeof(bmt_entry));
+    if ((bmt_block_index = load_bmt_data(system_block_count, size)))
+    {
+        MSG(INIT, "Load bmt data success @ block 0x%x\n", bmt_block_index);
+        dump_bmt_info(&bmt);
+        return &bmt;
+    } else
+    {
+        MSG(INIT, "Load bmt data fail, need re-construct!\n");
+#ifndef __UBOOT_NAND__            // BMT is not re-constructed in UBOOT.
+        if (reconstruct_bmt(&bmt))
+            return &bmt;
+        else
+#endif
+            return NULL;
+    }
+}
+
+/*******************************************************************
+* [BMT Interface]
+*
+* Description:
+*   Update BMT.
+*
+* Parameter:
+*   offset: update block/page offset.
+*   reason: update reason, see update_reason_t for reason.
+*   dat/oob: data and oob buffer for write fail.
+* 
+* Return: 
+*   Return true for success, and false for failure.
+*******************************************************************/
+bool update_bmt(u32 offset, update_reason_t reason, u8 * dat, u8 * oob)
+{
+    int map_index;
+    int orig_bad_block = -1;
+    // int bmt_update_index;
+    int i;
+    int bad_index = offset / BLOCK_SIZE_BMT;
+
+#ifndef MTK_NAND_BMT
+	return false;
+#endif
+    if (reason == UPDATE_WRITE_FAIL)
+    {
+        MSG(INIT, "Write fail, need to migrate\n");
+        if (!(map_index = migrate_from_bad(offset, dat, oob)))
+        {
+            MSG(INIT, "migrate fail\n");
+            return false;
+        }
+    } else
+    {
+        if (!(map_index = find_available_block(false)))
+        {
+            MSG(INIT, "Cannot find block in pool\n");
+            return false;
+        }
+    }
+
+    // now let's update BMT
+    if (bad_index >= system_block_count)    // mapped block become bad, find original bad block
+    {
+        for (i = 0; i < bmt_block_count; i++)
+        {
+            if (bmt.table[i].mapped_index == bad_index)
+            {
+                orig_bad_block = bmt.table[i].bad_index;
+                break;
+            }
+        }
+        // bmt.bad_count++;
+        MSG(INIT, "Mapped block becomes bad, orig bad block is 0x%x\n", orig_bad_block);
+
+        bmt.table[i].mapped_index = map_index;
+    } else
+    {
+        bmt.table[bmt.mapped_count].mapped_index = map_index;
+        bmt.table[bmt.mapped_count].bad_index = bad_index;
+        bmt.mapped_count++;
+    }
+
+    memset(oob_buf, 0xFF, sizeof(oob_buf));
+    fill_nand_bmt_buffer(&bmt, dat_buf, oob_buf);
+    if (!write_bmt_to_flash(dat_buf, oob_buf))
+        return false;
+
+    mark_block_bad_bmt(offset);
+
+    return true;
+}
+
+/*******************************************************************
+* [BMT Interface]
+*
+* Description:
+*   Given an block index, return mapped index if it's mapped, else 
+*   return given index.
+*
+* Parameter:
+*   index: given an block index. This value cannot exceed 
+*   system_block_count.
+*
+* Return NULL for failure
+*******************************************************************/
+u16 get_mapping_block_index(int index)
+{
+    int i;
+#ifndef MTK_NAND_BMT
+	return index;
+#endif
+    if (index > system_block_count)
+    {
+        return index;
+    }
+
+    for (i = 0; i < bmt.mapped_count; i++)
+    {
+        if (bmt.table[i].bad_index == index)
+        {
+            return bmt.table[i].mapped_index;
+        }
+    }
+
+    return index;
+}
+#ifdef __KERNEL_NAND__
+EXPORT_SYMBOL_GPL(init_bmt);
+EXPORT_SYMBOL_GPL(update_bmt);
+EXPORT_SYMBOL_GPL(get_mapping_block_index);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("MediaTek");
+MODULE_DESCRIPTION("Bad Block mapping management for MediaTek NAND Flash Driver");
+#endif
--- /dev/null
+++ b/drivers/mtd/nand/bmt.h
@@ -0,0 +1,80 @@
+#ifndef __BMT_H__
+#define __BMT_H__
+
+#include "nand_def.h"
+
+#if defined(__PRELOADER_NAND__)
+
+#include "nand.h"
+
+#elif defined(__UBOOT_NAND__)
+
+#include <linux/mtd/nand.h>
+#include "mtk_nand.h"
+
+#elif defined(__KERNEL_NAND__)
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/module.h>
+#include "mtk_nand.h"
+
+#endif
+
+
+#define MAX_BMT_SIZE        (0x80)
+#define BMT_VERSION         (1) // initial version
+
+#define MAIN_SIGNATURE_OFFSET   (0)
+#define OOB_SIGNATURE_OFFSET    (1)
+#define OOB_INDEX_OFFSET        (29)
+#define OOB_INDEX_SIZE          (2)
+#define FAKE_INDEX              (0xAAAA)
+
+typedef struct _bmt_entry_
+{
+    u16 bad_index;              // bad block index
+    u16 mapped_index;           // mapping block index in the replace pool
+} bmt_entry;
+
+typedef enum
+{
+    UPDATE_ERASE_FAIL,
+    UPDATE_WRITE_FAIL,
+    UPDATE_UNMAPPED_BLOCK,
+    UPDATE_REASON_COUNT,
+} update_reason_t;
+
+typedef struct
+{
+    bmt_entry table[MAX_BMT_SIZE];
+    u8 version;
+    u8 mapped_count;            // mapped block count in pool
+    u8 bad_count;               // bad block count in pool. Not used in V1
+} bmt_struct;
+
+/***************************************************************
+*                                                              *
+* Interface BMT need to use                                    *
+*                                                              *
+***************************************************************/
+extern bool mtk_nand_exec_read_page(struct mtd_info *mtd, u32 row, u32 page_size, u8 * dat, u8 * oob);
+extern int mtk_nand_block_bad_hw(struct mtd_info *mtd, loff_t ofs);
+extern int mtk_nand_erase_hw(struct mtd_info *mtd, int page);
+extern int mtk_nand_block_markbad_hw(struct mtd_info *mtd, loff_t ofs);
+extern int mtk_nand_exec_write_page(struct mtd_info *mtd, u32 row, u32 page_size, u8 * dat, u8 * oob);
+
+
+/***************************************************************
+*                                                              *
+* Different function interface for preloader/uboot/kernel      *
+*                                                              *
+***************************************************************/
+void set_bad_index_to_oob(u8 * oob, u16 index);
+
+
+bmt_struct *init_bmt(struct nand_chip *nand, int size);
+bool update_bmt(u32 offset, update_reason_t reason, u8 * dat, u8 * oob);
+unsigned short get_mapping_block_index(int index);
+
+#endif                          // #ifndef __BMT_H__
--- /dev/null
+++ b/drivers/mtd/nand/dev-nand.c
@@ -0,0 +1,63 @@
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+
+#include "mt6575_typedefs.h"
+
+#define RALINK_NAND_CTRL_BASE               0xBE003000
+#define NFI_base    RALINK_NAND_CTRL_BASE
+#define RALINK_NANDECC_CTRL_BASE    0xBE003800
+#define NFIECC_base RALINK_NANDECC_CTRL_BASE
+#define MT7621_NFI_IRQ_ID		SURFBOARDINT_NAND
+#define MT7621_NFIECC_IRQ_ID	SURFBOARDINT_NAND_ECC
+
+#define SURFBOARDINT_NAND 22
+#define SURFBOARDINT_NAND_ECC 23
+
+static struct resource MT7621_resource_nand[] = {
+        {
+                .start          = NFI_base,
+                .end            = NFI_base + 0x1A0,
+                .flags          = IORESOURCE_MEM,
+        },
+        {
+                .start          = NFIECC_base,
+                .end            = NFIECC_base + 0x150,
+                .flags          = IORESOURCE_MEM,
+        },
+        {
+                .start          = MT7621_NFI_IRQ_ID,
+                .flags          = IORESOURCE_IRQ,
+        },
+        {
+                .start          = MT7621_NFIECC_IRQ_ID,
+                .flags          = IORESOURCE_IRQ,
+        },
+};
+
+static struct platform_device MT7621_nand_dev = {
+    .name = "MT7621-NAND",
+    .id   = 0,
+        .num_resources  = ARRAY_SIZE(MT7621_resource_nand),
+        .resource               = MT7621_resource_nand,
+    .dev            = {
+        .platform_data = &mt7621_nand_hw,
+    },
+};
+
+
+int __init mtk_nand_register(void)
+{
+
+	int retval = 0;
+
+	retval = platform_device_register(&MT7621_nand_dev);
+	if (retval != 0) {
+		printk(KERN_ERR "register nand device fail\n");
+		return retval;
+	}
+
+
+	return retval;
+}
+arch_initcall(mtk_nand_register);
--- /dev/null
+++ b/drivers/mtd/nand/mt6575_typedefs.h
@@ -0,0 +1,340 @@
+/* Copyright Statement:
+ *
+ * This software/firmware and related documentation ("MediaTek Software") are
+ * protected under relevant copyright laws. The information contained herein
+ * is confidential and proprietary to MediaTek Inc. and/or its licensors.
+ * Without the prior written permission of MediaTek inc. and/or its licensors,
+ * any reproduction, modification, use or disclosure of MediaTek Software,
+ * and information contained herein, in whole or in part, shall be strictly prohibited.
+ */
+/* MediaTek Inc. (C) 2010. All rights reserved.
+ *
+ * BY OPENING THIS FILE, RECEIVER HEREBY UNEQUIVOCALLY ACKNOWLEDGES AND AGREES
+ * THAT THE SOFTWARE/FIRMWARE AND ITS DOCUMENTATIONS ("MEDIATEK SOFTWARE")
+ * RECEIVED FROM MEDIATEK AND/OR ITS REPRESENTATIVES ARE PROVIDED TO RECEIVER ON
+ * AN "AS-IS" BASIS ONLY. MEDIATEK EXPRESSLY DISCLAIMS ANY AND ALL WARRANTIES,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT.
+ * NEITHER DOES MEDIATEK PROVIDE ANY WARRANTY WHATSOEVER WITH RESPECT TO THE
+ * SOFTWARE OF ANY THIRD PARTY WHICH MAY BE USED BY, INCORPORATED IN, OR
+ * SUPPLIED WITH THE MEDIATEK SOFTWARE, AND RECEIVER AGREES TO LOOK ONLY TO SUCH
+ * THIRD PARTY FOR ANY WARRANTY CLAIM RELATING THERETO. RECEIVER EXPRESSLY ACKNOWLEDGES
+ * THAT IT IS RECEIVER'S SOLE RESPONSIBILITY TO OBTAIN FROM ANY THIRD PARTY ALL PROPER LICENSES
+ * CONTAINED IN MEDIATEK SOFTWARE. MEDIATEK SHALL ALSO NOT BE RESPONSIBLE FOR ANY MEDIATEK
+ * SOFTWARE RELEASES MADE TO RECEIVER'S SPECIFICATION OR TO CONFORM TO A PARTICULAR
+ * STANDARD OR OPEN FORUM. RECEIVER'S SOLE AND EXCLUSIVE REMEDY AND MEDIATEK'S ENTIRE AND
+ * CUMULATIVE LIABILITY WITH RESPECT TO THE MEDIATEK SOFTWARE RELEASED HEREUNDER WILL BE,
+ * AT MEDIATEK'S OPTION, TO REVISE OR REPLACE THE MEDIATEK SOFTWARE AT ISSUE,
+ * OR REFUND ANY SOFTWARE LICENSE FEES OR SERVICE CHARGE PAID BY RECEIVER TO
+ * MEDIATEK FOR SUCH MEDIATEK SOFTWARE AT ISSUE.
+ *
+ * The following software/firmware and/or related documentation ("MediaTek Software")
+ * have been modified by MediaTek Inc. All revisions are subject to any receiver's
+ * applicable license agreements with MediaTek Inc.
+ */
+
+/*****************************************************************************
+*  Copyright Statement:
+*  --------------------
+*  This software is protected by Copyright and the information contained
+*  herein is confidential. The software may not be copied and the information
+*  contained herein may not be used or disclosed except with the written
+*  permission of MediaTek Inc. (C) 2008
+*
+*  BY OPENING THIS FILE, BUYER HEREBY UNEQUIVOCALLY ACKNOWLEDGES AND AGREES
+*  THAT THE SOFTWARE/FIRMWARE AND ITS DOCUMENTATIONS ("MEDIATEK SOFTWARE")
+*  RECEIVED FROM MEDIATEK AND/OR ITS REPRESENTATIVES ARE PROVIDED TO BUYER ON
+*  AN "AS-IS" BASIS ONLY. MEDIATEK EXPRESSLY DISCLAIMS ANY AND ALL WARRANTIES,
+*  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
+*  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT.
+*  NEITHER DOES MEDIATEK PROVIDE ANY WARRANTY WHATSOEVER WITH RESPECT TO THE
+*  SOFTWARE OF ANY THIRD PARTY WHICH MAY BE USED BY, INCORPORATED IN, OR
+*  SUPPLIED WITH THE MEDIATEK SOFTWARE, AND BUYER AGREES TO LOOK ONLY TO SUCH
+*  THIRD PARTY FOR ANY WARRANTY CLAIM RELATING THERETO. MEDIATEK SHALL ALSO
+*  NOT BE RESPONSIBLE FOR ANY MEDIATEK SOFTWARE RELEASES MADE TO BUYER'S
+*  SPECIFICATION OR TO CONFORM TO A PARTICULAR STANDARD OR OPEN FORUM.
+*
+*  BUYER'S SOLE AND EXCLUSIVE REMEDY AND MEDIATEK'S ENTIRE AND CUMULATIVE
+*  LIABILITY WITH RESPECT TO THE MEDIATEK SOFTWARE RELEASED HEREUNDER WILL BE,
+*  AT MEDIATEK'S OPTION, TO REVISE OR REPLACE THE MEDIATEK SOFTWARE AT ISSUE,
+*  OR REFUND ANY SOFTWARE LICENSE FEES OR SERVICE CHARGE PAID BY BUYER TO
+*  MEDIATEK FOR SUCH MEDIATEK SOFTWARE AT ISSUE.
+*
+*  THE TRANSACTION CONTEMPLATED HEREUNDER SHALL BE CONSTRUED IN ACCORDANCE
+*  WITH THE LAWS OF THE STATE OF CALIFORNIA, USA, EXCLUDING ITS CONFLICT OF
+*  LAWS PRINCIPLES.  ANY DISPUTES, CONTROVERSIES OR CLAIMS ARISING THEREOF AND
+*  RELATED THERETO SHALL BE SETTLED BY ARBITRATION IN SAN FRANCISCO, CA, UNDER
+*  THE RULES OF THE INTERNATIONAL CHAMBER OF COMMERCE (ICC).
+*
+*****************************************************************************/
+
+#ifndef _MT6575_TYPEDEFS_H
+#define _MT6575_TYPEDEFS_H
+
+#if defined (__KERNEL_NAND__)
+#include <linux/bug.h>
+#else
+#define true 		1 
+#define false 		0  
+#define bool		u8
+#endif
+
+// ---------------------------------------------------------------------------
+//  Basic Type Definitions
+// ---------------------------------------------------------------------------
+
+typedef volatile unsigned char  *P_kal_uint8;
+typedef volatile unsigned short *P_kal_uint16;
+typedef volatile unsigned int   *P_kal_uint32;
+
+typedef long            LONG;
+typedef unsigned char   UBYTE;
+typedef short           SHORT;
+
+typedef signed char     kal_int8;
+typedef signed short    kal_int16;
+typedef signed int      kal_int32;
+typedef long long       kal_int64;
+typedef unsigned char   kal_uint8;
+typedef unsigned short  kal_uint16;
+typedef unsigned int    kal_uint32;
+typedef unsigned long long  kal_uint64;
+typedef char            kal_char;
+
+typedef unsigned int            *UINT32P;
+typedef volatile unsigned short *UINT16P;
+typedef volatile unsigned char  *UINT8P;
+typedef unsigned char           *U8P;
+
+typedef volatile unsigned char  *P_U8;
+typedef volatile signed char    *P_S8;
+typedef volatile unsigned short *P_U16;
+typedef volatile signed short   *P_S16;
+typedef volatile unsigned int   *P_U32;
+typedef volatile signed int     *P_S32;
+typedef unsigned long long      *P_U64;
+typedef signed long long        *P_S64;
+
+typedef unsigned char       U8;
+typedef signed char         S8;
+typedef unsigned short      U16;
+typedef signed short        S16;
+typedef unsigned int        U32;
+typedef signed int          S32;
+typedef unsigned long long  U64;
+typedef signed long long    S64;
+//typedef unsigned char       bool;
+
+typedef unsigned char   UINT8;
+typedef unsigned short  UINT16;
+typedef unsigned int    UINT32;
+typedef unsigned short  USHORT;
+typedef signed char     INT8;
+typedef signed short    INT16;
+typedef signed int      INT32;
+typedef unsigned int    DWORD;
+typedef void            VOID;
+typedef unsigned char   BYTE;
+typedef float           FLOAT;
+
+typedef char           *LPCSTR;
+typedef short          *LPWSTR;
+
+
+// ---------------------------------------------------------------------------
+//  Constants
+// ---------------------------------------------------------------------------
+
+#define IMPORT  EXTERN
+#ifndef __cplusplus
+  #define EXTERN  extern
+#else
+  #define EXTERN  extern "C"
+#endif
+#define LOCAL     static
+#define GLOBAL
+#define EXPORT    GLOBAL
+
+#define EQ        ==
+#define NEQ       !=
+#define AND       &&
+#define OR        ||
+#define XOR(A,B)  ((!(A) AND (B)) OR ((A) AND !(B)))
+
+#ifndef FALSE
+  #define FALSE (0)
+#endif
+
+#ifndef TRUE
+  #define TRUE  (1)
+#endif
+
+#ifndef NULL
+  #define NULL  (0)
+#endif
+
+//enum boolean {false, true};
+enum {RX, TX, NONE};
+
+#ifndef BOOL
+typedef unsigned char  BOOL;
+#endif
+
+typedef enum {
+   KAL_FALSE = 0,
+   KAL_TRUE  = 1,
+} kal_bool;
+
+
+// ---------------------------------------------------------------------------
+//  Type Casting
+// ---------------------------------------------------------------------------
+
+#define AS_INT32(x)     (*(INT32 *)((void*)x))
+#define AS_INT16(x)     (*(INT16 *)((void*)x))
+#define AS_INT8(x)      (*(INT8  *)((void*)x))
+
+#define AS_UINT32(x)    (*(UINT32 *)((void*)x))
+#define AS_UINT16(x)    (*(UINT16 *)((void*)x))
+#define AS_UINT8(x)     (*(UINT8  *)((void*)x))
+
+
+// ---------------------------------------------------------------------------
+//  Register Manipulations
+// ---------------------------------------------------------------------------
+
+#define READ_REGISTER_UINT32(reg) \
+    (*(volatile UINT32 * const)(reg))
+
+#define WRITE_REGISTER_UINT32(reg, val) \
+    (*(volatile UINT32 * const)(reg)) = (val)
+
+#define READ_REGISTER_UINT16(reg) \
+    (*(volatile UINT16 * const)(reg))
+
+#define WRITE_REGISTER_UINT16(reg, val) \
+    (*(volatile UINT16 * const)(reg)) = (val)
+
+#define READ_REGISTER_UINT8(reg) \
+    (*(volatile UINT8 * const)(reg))
+
+#define WRITE_REGISTER_UINT8(reg, val) \
+    (*(volatile UINT8 * const)(reg)) = (val)
+
+#define INREG8(x)           READ_REGISTER_UINT8((UINT8*)((void*)(x)))
+#define OUTREG8(x, y)       WRITE_REGISTER_UINT8((UINT8*)((void*)(x)), (UINT8)(y))
+#define SETREG8(x, y)       OUTREG8(x, INREG8(x)|(y))
+#define CLRREG8(x, y)       OUTREG8(x, INREG8(x)&~(y))
+#define MASKREG8(x, y, z)   OUTREG8(x, (INREG8(x)&~(y))|(z))
+
+#define INREG16(x)          READ_REGISTER_UINT16((UINT16*)((void*)(x)))
+#define OUTREG16(x, y)      WRITE_REGISTER_UINT16((UINT16*)((void*)(x)),(UINT16)(y))
+#define SETREG16(x, y)      OUTREG16(x, INREG16(x)|(y))
+#define CLRREG16(x, y)      OUTREG16(x, INREG16(x)&~(y))
+#define MASKREG16(x, y, z)  OUTREG16(x, (INREG16(x)&~(y))|(z))
+
+#define INREG32(x)          READ_REGISTER_UINT32((UINT32*)((void*)(x)))
+#define OUTREG32(x, y)      WRITE_REGISTER_UINT32((UINT32*)((void*)(x)), (UINT32)(y))
+#define SETREG32(x, y)      OUTREG32(x, INREG32(x)|(y))
+#define CLRREG32(x, y)      OUTREG32(x, INREG32(x)&~(y))
+#define MASKREG32(x, y, z)  OUTREG32(x, (INREG32(x)&~(y))|(z))
+
+
+#define DRV_Reg8(addr)              INREG8(addr)
+#define DRV_WriteReg8(addr, data)   OUTREG8(addr, data)
+#define DRV_SetReg8(addr, data)     SETREG8(addr, data)
+#define DRV_ClrReg8(addr, data)     CLRREG8(addr, data)
+
+#define DRV_Reg16(addr)             INREG16(addr)
+#define DRV_WriteReg16(addr, data)  OUTREG16(addr, data)
+#define DRV_SetReg16(addr, data)    SETREG16(addr, data)
+#define DRV_ClrReg16(addr, data)    CLRREG16(addr, data)
+
+#define DRV_Reg32(addr)             INREG32(addr)
+#define DRV_WriteReg32(addr, data)  OUTREG32(addr, data)
+#define DRV_SetReg32(addr, data)    SETREG32(addr, data)
+#define DRV_ClrReg32(addr, data)    CLRREG32(addr, data)
+
+// !!! DEPRECATED, WILL BE REMOVED LATER !!!
+#define DRV_Reg(addr)               DRV_Reg16(addr)
+#define DRV_WriteReg(addr, data)    DRV_WriteReg16(addr, data)
+#define DRV_SetReg(addr, data)      DRV_SetReg16(addr, data)
+#define DRV_ClrReg(addr, data)      DRV_ClrReg16(addr, data)
+
+
+// ---------------------------------------------------------------------------
+//  Compiler Time Deduction Macros
+// ---------------------------------------------------------------------------
+
+#define _MASK_OFFSET_1(x, n)  ((x) & 0x1) ? (n) :
+#define _MASK_OFFSET_2(x, n)  _MASK_OFFSET_1((x), (n)) _MASK_OFFSET_1((x) >> 1, (n) + 1)
+#define _MASK_OFFSET_4(x, n)  _MASK_OFFSET_2((x), (n)) _MASK_OFFSET_2((x) >> 2, (n) + 2)
+#define _MASK_OFFSET_8(x, n)  _MASK_OFFSET_4((x), (n)) _MASK_OFFSET_4((x) >> 4, (n) + 4)
+#define _MASK_OFFSET_16(x, n) _MASK_OFFSET_8((x), (n)) _MASK_OFFSET_8((x) >> 8, (n) + 8)
+#define _MASK_OFFSET_32(x, n) _MASK_OFFSET_16((x), (n)) _MASK_OFFSET_16((x) >> 16, (n) + 16)
+
+#define MASK_OFFSET_ERROR (0xFFFFFFFF)
+
+#define MASK_OFFSET(x) (_MASK_OFFSET_32(x, 0) MASK_OFFSET_ERROR)
+
+
+// ---------------------------------------------------------------------------
+//  Assertions
+// ---------------------------------------------------------------------------
+
+#ifndef ASSERT
+    #define ASSERT(expr)        BUG_ON(!(expr))
+#endif
+
+#ifndef NOT_IMPLEMENTED
+    #define NOT_IMPLEMENTED()   BUG_ON(1)
+#endif    
+
+#define STATIC_ASSERT(pred)         STATIC_ASSERT_X(pred, __LINE__)
+#define STATIC_ASSERT_X(pred, line) STATIC_ASSERT_XX(pred, line)
+#define STATIC_ASSERT_XX(pred, line) \
+    extern char assertion_failed_at_##line[(pred) ? 1 : -1]
+
+// ---------------------------------------------------------------------------
+//  Resolve Compiler Warnings
+// ---------------------------------------------------------------------------
+
+#define NOT_REFERENCED(x)   { (x) = (x); }
+
+
+// ---------------------------------------------------------------------------
+//  Utilities
+// ---------------------------------------------------------------------------
+
+#define MAXIMUM(A,B)       (((A)>(B))?(A):(B))
+#define MINIMUM(A,B)       (((A)<(B))?(A):(B))
+
+#define ARY_SIZE(x) (sizeof((x)) / sizeof((x[0])))
+#define DVT_DELAYMACRO(u4Num)                                            \
+{                                                                        \
+    UINT32 u4Count = 0 ;                                                 \
+    for (u4Count = 0; u4Count < u4Num; u4Count++ );                      \
+}                                                                        \
+
+#define    A68351B      0
+#define    B68351B      1
+#define    B68351D      2
+#define    B68351E      3
+#define    UNKNOWN_IC_VERSION   0xFF
+
+/* NAND driver */
+struct mtk_nand_host_hw {
+    unsigned int nfi_bus_width;		    /* NFI_BUS_WIDTH */ 
+	unsigned int nfi_access_timing;		/* NFI_ACCESS_TIMING */  
+	unsigned int nfi_cs_num;			/* NFI_CS_NUM */
+	unsigned int nand_sec_size;			/* NAND_SECTOR_SIZE */
+	unsigned int nand_sec_shift;		/* NAND_SECTOR_SHIFT */
+	unsigned int nand_ecc_size;
+	unsigned int nand_ecc_bytes;
+	unsigned int nand_ecc_mode;
+};
+extern struct mtk_nand_host_hw mt7621_nand_hw;
+extern unsigned int	CFG_BLOCKSIZE;
+
+#endif  // _MT6575_TYPEDEFS_H
+
--- /dev/null
+++ b/drivers/mtd/nand/mtk_nand.c
@@ -0,0 +1,2304 @@
+/******************************************************************************
+* mtk_nand.c - MTK NAND Flash Device Driver
+ *
+* Copyright 2009-2012 MediaTek Co.,Ltd.
+ *
+* DESCRIPTION:
+* 	This file provid the other drivers nand relative functions
+ *
+* modification history
+* ----------------------------------------
+* v3.0, 11 Feb 2010, mtk
+* ----------------------------------------
+******************************************************************************/
+#include "nand_def.h"
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/wait.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/nand_ecc.h>
+#include <linux/dma-mapping.h>
+#include <linux/jiffies.h>
+#include <linux/platform_device.h>
+#include <linux/proc_fs.h>
+#include <linux/time.h>
+#include <linux/mm.h>
+#include <asm/io.h>
+#include <asm/cacheflush.h>
+#include <asm/uaccess.h>
+#include <linux/miscdevice.h>
+#include "mtk_nand.h"
+#include "nand_device_list.h"
+
+#include "bmt.h"
+#include "partition.h"
+
+unsigned int CFG_BLOCKSIZE;
+
+static int shift_on_bbt = 0;
+extern void nand_bbt_set(struct mtd_info *mtd, int page, int flag);
+extern int nand_bbt_get(struct mtd_info *mtd, int page);
+int mtk_nand_read_oob_hw(struct mtd_info *mtd, struct nand_chip *chip, int page);
+
+static const char * const probe_types[] = { "cmdlinepart", "ofpart", NULL };
+
+#define NAND_CMD_STATUS_MULTI  0x71
+
+void show_stack(struct task_struct *tsk, unsigned long *sp);
+extern void mt_irq_set_sens(unsigned int irq, unsigned int sens);
+extern void mt_irq_set_polarity(unsigned int irq,unsigned int polarity);
+
+struct mtk_nand_host	mtk_nand_host;	/* include mtd_info and nand_chip structs */
+struct mtk_nand_host_hw mt7621_nand_hw = {
+    .nfi_bus_width          = 8,
+    .nfi_access_timing      = NFI_DEFAULT_ACCESS_TIMING,
+    .nfi_cs_num             = NFI_CS_NUM,
+    .nand_sec_size          = 512,
+    .nand_sec_shift         = 9,
+    .nand_ecc_size          = 2048,
+    .nand_ecc_bytes         = 32,
+    .nand_ecc_mode          = NAND_ECC_HW,
+};
+
+
+/*******************************************************************************
+ * Gloable Varible Definition
+ *******************************************************************************/
+
+#define NFI_ISSUE_COMMAND(cmd, col_addr, row_addr, col_num, row_num) \
+   do { \
+      DRV_WriteReg(NFI_CMD_REG16,cmd);\
+      while (DRV_Reg32(NFI_STA_REG32) & STA_CMD_STATE);\
+      DRV_WriteReg32(NFI_COLADDR_REG32, col_addr);\
+      DRV_WriteReg32(NFI_ROWADDR_REG32, row_addr);\
+      DRV_WriteReg(NFI_ADDRNOB_REG16, col_num | (row_num<<ADDR_ROW_NOB_SHIFT));\
+      while (DRV_Reg32(NFI_STA_REG32) & STA_ADDR_STATE);\
+   }while(0);
+
+//-------------------------------------------------------------------------------
+static struct NAND_CMD g_kCMD;
+static u32 g_u4ChipVer;
+bool g_bInitDone;
+static bool g_bcmdstatus;
+static u32 g_value = 0;
+static int g_page_size;
+
+BOOL g_bHwEcc = true;
+
+
+static u8 *local_buffer_16_align;   // 16 byte aligned buffer, for HW issue
+static u8 local_buffer[4096 + 512];
+
+extern void nand_release_device(struct mtd_info *mtd);
+extern int nand_get_device(struct nand_chip *chip, struct mtd_info *mtd, int new_state);
+
+#if defined(MTK_NAND_BMT)
+static bmt_struct *g_bmt;
+#endif
+struct mtk_nand_host *host;
+extern struct mtd_partition g_pasStatic_Partition[];
+int part_num = NUM_PARTITIONS;
+int manu_id;
+int dev_id;
+
+static u8 local_oob_buf[NAND_MAX_OOBSIZE];
+
+static u8 nand_badblock_offset = 0;
+
+void nand_enable_clock(void)
+{
+    //enable_clock(MT65XX_PDN_PERI_NFI, "NAND");
+}
+
+void nand_disable_clock(void)
+{
+    //disable_clock(MT65XX_PDN_PERI_NFI, "NAND");
+}
+
+static struct nand_ecclayout nand_oob_16 = {
+	.eccbytes = 8,
+	.eccpos = {8, 9, 10, 11, 12, 13, 14, 15},
+	.oobfree = {{1, 6}, {0, 0}}
+};
+
+struct nand_ecclayout nand_oob_64 = {
+	.eccbytes = 32,
+	.eccpos = {32, 33, 34, 35, 36, 37, 38, 39,
+		40, 41, 42, 43, 44, 45, 46, 47,
+		48, 49, 50, 51, 52, 53, 54, 55,
+		56, 57, 58, 59, 60, 61, 62, 63},
+	.oobfree = {{1, 7}, {9, 7}, {17, 7}, {25, 6}, {0, 0}}
+};
+
+struct nand_ecclayout nand_oob_128 = {
+	.eccbytes = 64,
+	.eccpos = {
+		64, 65, 66, 67, 68, 69, 70, 71,
+		72, 73, 74, 75, 76, 77, 78, 79,
+		80, 81, 82, 83, 84, 85, 86, 86,
+		88, 89, 90, 91, 92, 93, 94, 95,
+		96, 97, 98, 99, 100, 101, 102, 103,
+		104, 105, 106, 107, 108, 109, 110, 111,
+		112, 113, 114, 115, 116, 117, 118, 119,
+		120, 121, 122, 123, 124, 125, 126, 127},
+	.oobfree = {{1, 7}, {9, 7}, {17, 7}, {25, 7}, {33, 7}, {41, 7}, {49, 7}, {57, 6}}
+};
+
+flashdev_info devinfo;
+
+void dump_nfi(void)
+{
+}
+
+void dump_ecc(void)
+{
+}
+
+u32
+nand_virt_to_phys_add(u32 va)
+{
+	u32 pageOffset = (va & (PAGE_SIZE - 1));
+	pgd_t *pgd;
+	pmd_t *pmd;
+	pte_t *pte;
+	u32 pa;
+
+	if (virt_addr_valid(va))
+		return __virt_to_phys(va);
+
+	if (NULL == current) {
+		printk(KERN_ERR "[nand_virt_to_phys_add] ERROR ,current is NULL! \n");
+		return 0;
+	}
+
+	if (NULL == current->mm) {
+		printk(KERN_ERR "[nand_virt_to_phys_add] ERROR current->mm is NULL! tgid=0x%x, name=%s \n", current->tgid, current->comm);
+		return 0;
+	}
+
+	pgd = pgd_offset(current->mm, va);  /* what is tsk->mm */
+	if (pgd_none(*pgd) || pgd_bad(*pgd)) {
+		printk(KERN_ERR "[nand_virt_to_phys_add] ERROR, va=0x%x, pgd invalid! \n", va);
+		return 0;
+	}
+
+	pmd = pmd_offset((pud_t *)pgd, va);
+	if (pmd_none(*pmd) || pmd_bad(*pmd)) {
+		printk(KERN_ERR "[nand_virt_to_phys_add] ERROR, va=0x%x, pmd invalid! \n", va);
+		return 0;
+	}
+
+	pte = pte_offset_map(pmd, va);
+	if (pte_present(*pte)) {
+		pa = (pte_val(*pte) & (PAGE_MASK)) | pageOffset;
+		return pa;
+	}
+
+	printk(KERN_ERR "[nand_virt_to_phys_add] ERROR va=0x%x, pte invalid! \n", va);
+	return 0;
+}
+EXPORT_SYMBOL(nand_virt_to_phys_add);
+
+bool
+get_device_info(u16 id, u32 ext_id, flashdev_info * pdevinfo)
+{
+	u32 index;
+	for (index = 0; gen_FlashTable[index].id != 0; index++) {
+		if (id == gen_FlashTable[index].id && ext_id == gen_FlashTable[index].ext_id) {
+			pdevinfo->id = gen_FlashTable[index].id;
+			pdevinfo->ext_id = gen_FlashTable[index].ext_id;
+			pdevinfo->blocksize = gen_FlashTable[index].blocksize;
+			pdevinfo->addr_cycle = gen_FlashTable[index].addr_cycle;
+			pdevinfo->iowidth = gen_FlashTable[index].iowidth;
+			pdevinfo->timmingsetting = gen_FlashTable[index].timmingsetting;
+			pdevinfo->advancedmode = gen_FlashTable[index].advancedmode;
+			pdevinfo->pagesize = gen_FlashTable[index].pagesize;
+			pdevinfo->sparesize = gen_FlashTable[index].sparesize;
+			pdevinfo->totalsize = gen_FlashTable[index].totalsize;
+			memcpy(pdevinfo->devciename, gen_FlashTable[index].devciename, sizeof(pdevinfo->devciename));
+			printk(KERN_INFO "Device found in MTK table, ID: %x, EXT_ID: %x\n", id, ext_id);
+
+			goto find;
+		}
+	}
+
+find:
+	if (0 == pdevinfo->id) {
+		printk(KERN_INFO "Device not found, ID: %x\n", id);
+		return false;
+	} else {
+		return true;
+	}
+}
+
+static void
+ECC_Config(struct mtk_nand_host_hw *hw,u32 ecc_bit)
+{
+	u32 u4ENCODESize;
+	u32 u4DECODESize;
+	u32 ecc_bit_cfg = ECC_CNFG_ECC4;
+
+	switch(ecc_bit){
+	case 4:
+		ecc_bit_cfg = ECC_CNFG_ECC4;
+		break;
+	case 8:
+		ecc_bit_cfg = ECC_CNFG_ECC8;
+		break;
+	case 10:
+		ecc_bit_cfg = ECC_CNFG_ECC10;
+		break;
+	case 12:
+		ecc_bit_cfg = ECC_CNFG_ECC12;
+		break;
+	default:
+		break;
+	}
+	DRV_WriteReg16(ECC_DECCON_REG16, DEC_DE);
+	do {
+	} while (!DRV_Reg16(ECC_DECIDLE_REG16));
+
+	DRV_WriteReg16(ECC_ENCCON_REG16, ENC_DE);
+	do {
+	} while (!DRV_Reg32(ECC_ENCIDLE_REG32));
+
+	/* setup FDM register base */
+	DRV_WriteReg32(ECC_FDMADDR_REG32, NFI_FDM0L_REG32);
+
+	/* Sector + FDM */
+	u4ENCODESize = (hw->nand_sec_size + 8) << 3;
+	/* Sector + FDM + YAFFS2 meta data bits */
+	u4DECODESize = ((hw->nand_sec_size + 8) << 3) + ecc_bit * 13;
+
+	/* configure ECC decoder && encoder */
+	DRV_WriteReg32(ECC_DECCNFG_REG32, ecc_bit_cfg | DEC_CNFG_NFI | DEC_CNFG_EMPTY_EN | (u4DECODESize << DEC_CNFG_CODE_SHIFT));
+
+	DRV_WriteReg32(ECC_ENCCNFG_REG32, ecc_bit_cfg | ENC_CNFG_NFI | (u4ENCODESize << ENC_CNFG_MSG_SHIFT));
+	NFI_SET_REG32(ECC_DECCNFG_REG32, DEC_CNFG_EL);
+}
+
+static void
+ECC_Decode_Start(void)
+{
+	while (!(DRV_Reg16(ECC_DECIDLE_REG16) & DEC_IDLE))
+		;
+	DRV_WriteReg16(ECC_DECCON_REG16, DEC_EN);
+}
+
+static void
+ECC_Decode_End(void)
+{
+	while (!(DRV_Reg16(ECC_DECIDLE_REG16) & DEC_IDLE))
+		;
+	DRV_WriteReg16(ECC_DECCON_REG16, DEC_DE);
+}
+
+static void
+ECC_Encode_Start(void)
+{
+	while (!(DRV_Reg32(ECC_ENCIDLE_REG32) & ENC_IDLE))
+		;
+	mb();
+	DRV_WriteReg16(ECC_ENCCON_REG16, ENC_EN);
+}
+
+static void
+ECC_Encode_End(void)
+{
+	/* wait for device returning idle */
+	while (!(DRV_Reg32(ECC_ENCIDLE_REG32) & ENC_IDLE)) ;
+	mb();
+	DRV_WriteReg16(ECC_ENCCON_REG16, ENC_DE);
+}
+
+static bool
+mtk_nand_check_bch_error(struct mtd_info *mtd, u8 * pDataBuf, u32 u4SecIndex, u32 u4PageAddr)
+{
+	bool bRet = true;
+	u16 u2SectorDoneMask = 1 << u4SecIndex;
+	u32 u4ErrorNumDebug, i, u4ErrNum;
+	u32 timeout = 0xFFFF;
+	// int el;
+	u32 au4ErrBitLoc[6];
+	u32 u4ErrByteLoc, u4BitOffset;
+	u32 u4ErrBitLoc1th, u4ErrBitLoc2nd;
+
+	//4 // Wait for Decode Done
+	while (0 == (u2SectorDoneMask & DRV_Reg16(ECC_DECDONE_REG16))) {
+		timeout--;
+		if (0 == timeout)
+			return false;
+	}
+	/* We will manually correct the error bits in the last sector, not all the sectors of the page! */
+	memset(au4ErrBitLoc, 0x0, sizeof(au4ErrBitLoc));
+	u4ErrorNumDebug = DRV_Reg32(ECC_DECENUM_REG32);
+	u4ErrNum = DRV_Reg32(ECC_DECENUM_REG32) >> (u4SecIndex << 2);
+	u4ErrNum &= 0xF;
+
+	if (u4ErrNum) {
+		if (0xF == u4ErrNum) {
+			mtd->ecc_stats.failed++;
+			bRet = false;
+			//printk(KERN_ERR"UnCorrectable at PageAddr=%d\n", u4PageAddr);
+		} else {
+			for (i = 0; i < ((u4ErrNum + 1) >> 1); ++i) {
+				au4ErrBitLoc[i] = DRV_Reg32(ECC_DECEL0_REG32 + i);
+				u4ErrBitLoc1th = au4ErrBitLoc[i] & 0x1FFF;
+				if (u4ErrBitLoc1th < 0x1000) {
+					u4ErrByteLoc = u4ErrBitLoc1th / 8;
+					u4BitOffset = u4ErrBitLoc1th % 8;
+					pDataBuf[u4ErrByteLoc] = pDataBuf[u4ErrByteLoc] ^ (1 << u4BitOffset);
+					mtd->ecc_stats.corrected++;
+				} else {
+					mtd->ecc_stats.failed++;
+				}
+				u4ErrBitLoc2nd = (au4ErrBitLoc[i] >> 16) & 0x1FFF;
+				if (0 != u4ErrBitLoc2nd) {
+					if (u4ErrBitLoc2nd < 0x1000) {
+						u4ErrByteLoc = u4ErrBitLoc2nd / 8;
+						u4BitOffset = u4ErrBitLoc2nd % 8;
+						pDataBuf[u4ErrByteLoc] = pDataBuf[u4ErrByteLoc] ^ (1 << u4BitOffset);
+						mtd->ecc_stats.corrected++;
+					} else {
+						mtd->ecc_stats.failed++;
+						//printk(KERN_ERR"UnCorrectable High ErrLoc=%d\n", au4ErrBitLoc[i]);
+					}
+				}
+			}
+		}
+		if (0 == (DRV_Reg16(ECC_DECFER_REG16) & (1 << u4SecIndex)))
+			bRet = false;
+	}
+	return bRet;
+}
+
+static bool
+mtk_nand_RFIFOValidSize(u16 u2Size)
+{
+	u32 timeout = 0xFFFF;
+	while (FIFO_RD_REMAIN(DRV_Reg16(NFI_FIFOSTA_REG16)) < u2Size) {
+		timeout--;
+		if (0 == timeout)
+			return false;
+	}
+	return true;
+}
+
+static bool
+mtk_nand_WFIFOValidSize(u16 u2Size)
+{
+	u32 timeout = 0xFFFF;
+
+	while (FIFO_WR_REMAIN(DRV_Reg16(NFI_FIFOSTA_REG16)) > u2Size) {
+		timeout--;
+		if (0 == timeout)
+			return false;
+	}
+	return true;
+}
+
+static bool
+mtk_nand_status_ready(u32 u4Status)
+{
+	u32 timeout = 0xFFFF;
+
+	while ((DRV_Reg32(NFI_STA_REG32) & u4Status) != 0) {
+		timeout--;
+		if (0 == timeout)
+			return false;
+	}
+	return true;
+}
+
+static bool
+mtk_nand_reset(void)
+{
+	int timeout = 0xFFFF;
+	if (DRV_Reg16(NFI_MASTERSTA_REG16)) {
+		mb();
+		DRV_WriteReg16(NFI_CON_REG16, CON_FIFO_FLUSH | CON_NFI_RST);
+		while (DRV_Reg16(NFI_MASTERSTA_REG16)) {
+			timeout--;
+			if (!timeout)
+				MSG(INIT, "Wait for NFI_MASTERSTA timeout\n");
+		}
+	}
+	/* issue reset operation */
+	mb();
+	DRV_WriteReg16(NFI_CON_REG16, CON_FIFO_FLUSH | CON_NFI_RST);
+
+	return mtk_nand_status_ready(STA_NFI_FSM_MASK | STA_NAND_BUSY) && mtk_nand_RFIFOValidSize(0) && mtk_nand_WFIFOValidSize(0);
+}
+
+static void
+mtk_nand_set_mode(u16 u2OpMode)
+{
+	u16 u2Mode = DRV_Reg16(NFI_CNFG_REG16);
+	u2Mode &= ~CNFG_OP_MODE_MASK;
+	u2Mode |= u2OpMode;
+	DRV_WriteReg16(NFI_CNFG_REG16, u2Mode);
+}
+
+static void
+mtk_nand_set_autoformat(bool bEnable)
+{
+	if (bEnable)
+		NFI_SET_REG16(NFI_CNFG_REG16, CNFG_AUTO_FMT_EN);
+	else
+		NFI_CLN_REG16(NFI_CNFG_REG16, CNFG_AUTO_FMT_EN);
+}
+
+static void
+mtk_nand_configure_fdm(u16 u2FDMSize)
+{
+	NFI_CLN_REG16(NFI_PAGEFMT_REG16, PAGEFMT_FDM_MASK | PAGEFMT_FDM_ECC_MASK);
+	NFI_SET_REG16(NFI_PAGEFMT_REG16, u2FDMSize << PAGEFMT_FDM_SHIFT);
+	NFI_SET_REG16(NFI_PAGEFMT_REG16, u2FDMSize << PAGEFMT_FDM_ECC_SHIFT);
+}
+
+static void
+mtk_nand_configure_lock(void)
+{
+	u32 u4WriteColNOB = 2;
+	u32 u4WriteRowNOB = 3;
+	u32 u4EraseColNOB = 0;
+	u32 u4EraseRowNOB = 3;
+	DRV_WriteReg16(NFI_LOCKANOB_REG16,
+		(u4WriteColNOB << PROG_CADD_NOB_SHIFT) | (u4WriteRowNOB << PROG_RADD_NOB_SHIFT) | (u4EraseColNOB << ERASE_CADD_NOB_SHIFT) | (u4EraseRowNOB << ERASE_RADD_NOB_SHIFT));
+
+	if (CHIPVER_ECO_1 == g_u4ChipVer) {
+		int i;
+		for (i = 0; i < 16; ++i) {
+			DRV_WriteReg32(NFI_LOCK00ADD_REG32 + (i << 1), 0xFFFFFFFF);
+			DRV_WriteReg32(NFI_LOCK00FMT_REG32 + (i << 1), 0xFFFFFFFF);
+		}
+		//DRV_WriteReg16(NFI_LOCKANOB_REG16, 0x0);
+		DRV_WriteReg32(NFI_LOCKCON_REG32, 0xFFFFFFFF);
+		DRV_WriteReg16(NFI_LOCK_REG16, NFI_LOCK_ON);
+	}
+}
+
+static bool
+mtk_nand_pio_ready(void)
+{
+	int count = 0;
+	while (!(DRV_Reg16(NFI_PIO_DIRDY_REG16) & 1)) {
+		count++;
+		if (count > 0xffff) {
+			printk("PIO_DIRDY timeout\n");
+			return false;
+		}
+	}
+
+	return true;
+}
+
+static bool
+mtk_nand_set_command(u16 command)
+{
+	mb();
+	DRV_WriteReg16(NFI_CMD_REG16, command);
+	return mtk_nand_status_ready(STA_CMD_STATE);
+}
+
+static bool
+mtk_nand_set_address(u32 u4ColAddr, u32 u4RowAddr, u16 u2ColNOB, u16 u2RowNOB)
+{
+	mb();
+	DRV_WriteReg32(NFI_COLADDR_REG32, u4ColAddr);
+	DRV_WriteReg32(NFI_ROWADDR_REG32, u4RowAddr);
+	DRV_WriteReg16(NFI_ADDRNOB_REG16, u2ColNOB | (u2RowNOB << ADDR_ROW_NOB_SHIFT));
+	return mtk_nand_status_ready(STA_ADDR_STATE);
+}
+
+static bool
+mtk_nand_check_RW_count(u16 u2WriteSize)
+{
+	u32 timeout = 0xFFFF;
+	u16 u2SecNum = u2WriteSize >> 9;
+
+	while (ADDRCNTR_CNTR(DRV_Reg16(NFI_ADDRCNTR_REG16)) < u2SecNum) {
+		timeout--;
+		if (0 == timeout) {
+			printk(KERN_INFO "[%s] timeout\n", __FUNCTION__);
+			return false;
+		}
+	}
+	return true;
+}
+
+static bool
+mtk_nand_ready_for_read(struct nand_chip *nand, u32 u4RowAddr, u32 u4ColAddr, bool full, u8 * buf)
+{
+	/* Reset NFI HW internal state machine and flush NFI in/out FIFO */
+	bool bRet = false;
+	u16 sec_num = 1 << (nand->page_shift - 9);
+	u32 col_addr = u4ColAddr;
+	u32 colnob = 2, rownob = devinfo.addr_cycle - 2;
+	if (nand->options & NAND_BUSWIDTH_16)
+		col_addr /= 2;
+
+	if (!mtk_nand_reset())
+		goto cleanup;
+	if (g_bHwEcc)	{
+		NFI_SET_REG16(NFI_CNFG_REG16, CNFG_HW_ECC_EN);
+	} else	{
+		NFI_CLN_REG16(NFI_CNFG_REG16, CNFG_HW_ECC_EN);
+	}
+
+	mtk_nand_set_mode(CNFG_OP_READ);
+	NFI_SET_REG16(NFI_CNFG_REG16, CNFG_READ_EN);
+	DRV_WriteReg16(NFI_CON_REG16, sec_num << CON_NFI_SEC_SHIFT);
+
+	if (full) {
+		NFI_CLN_REG16(NFI_CNFG_REG16, CNFG_AHB);
+
+		if (g_bHwEcc)
+			NFI_SET_REG16(NFI_CNFG_REG16, CNFG_HW_ECC_EN);
+		else
+			NFI_CLN_REG16(NFI_CNFG_REG16, CNFG_HW_ECC_EN);
+	} else {
+		NFI_CLN_REG16(NFI_CNFG_REG16, CNFG_HW_ECC_EN);
+		NFI_CLN_REG16(NFI_CNFG_REG16, CNFG_AHB);
+	}
+
+	mtk_nand_set_autoformat(full);
+	if (full)
+		if (g_bHwEcc)
+			ECC_Decode_Start();
+	if (!mtk_nand_set_command(NAND_CMD_READ0))
+		goto cleanup;
+	if (!mtk_nand_set_address(col_addr, u4RowAddr, colnob, rownob))
+		goto cleanup;
+	if (!mtk_nand_set_command(NAND_CMD_READSTART))
+		goto cleanup;
+	if (!mtk_nand_status_ready(STA_NAND_BUSY))
+		goto cleanup;
+
+	bRet = true;
+
+cleanup:
+	return bRet;
+}
+
+static bool
+mtk_nand_ready_for_write(struct nand_chip *nand, u32 u4RowAddr, u32 col_addr, bool full, u8 * buf)
+{
+	bool bRet = false;
+	u32 sec_num = 1 << (nand->page_shift - 9);
+	u32 colnob = 2, rownob = devinfo.addr_cycle - 2;
+	if (nand->options & NAND_BUSWIDTH_16)
+		col_addr /= 2;
+
+	/* Reset NFI HW internal state machine and flush NFI in/out FIFO */
+	if (!mtk_nand_reset())
+		return false;
+
+	mtk_nand_set_mode(CNFG_OP_PRGM);
+
+	NFI_CLN_REG16(NFI_CNFG_REG16, CNFG_READ_EN);
+
+	DRV_WriteReg16(NFI_CON_REG16, sec_num << CON_NFI_SEC_SHIFT);
+
+	if (full) {
+		NFI_CLN_REG16(NFI_CNFG_REG16, CNFG_AHB);
+		if (g_bHwEcc)
+			NFI_SET_REG16(NFI_CNFG_REG16, CNFG_HW_ECC_EN);
+		else
+			NFI_CLN_REG16(NFI_CNFG_REG16, CNFG_HW_ECC_EN);
+	} else {
+		NFI_CLN_REG16(NFI_CNFG_REG16, CNFG_HW_ECC_EN);
+		NFI_CLN_REG16(NFI_CNFG_REG16, CNFG_AHB);
+	}
+
+	mtk_nand_set_autoformat(full);
+
+	if (full)
+		if (g_bHwEcc)
+			ECC_Encode_Start();
+
+	if (!mtk_nand_set_command(NAND_CMD_SEQIN))
+		goto cleanup;
+	//1 FIXED ME: For Any Kind of AddrCycle
+	if (!mtk_nand_set_address(col_addr, u4RowAddr, colnob, rownob))
+		goto cleanup;
+
+	if (!mtk_nand_status_ready(STA_NAND_BUSY))
+		goto cleanup;
+
+	bRet = true;
+
+cleanup:
+	return bRet;
+}
+
+static bool
+mtk_nand_check_dececc_done(u32 u4SecNum)
+{
+	u32 timeout, dec_mask;
+
+	timeout = 0xffff;
+	dec_mask = (1 << u4SecNum) - 1;
+	while ((dec_mask != DRV_Reg(ECC_DECDONE_REG16)) && timeout > 0)
+		timeout--;
+	if (timeout == 0) {
+		MSG(VERIFY, "ECC_DECDONE: timeout\n");
+		return false;
+	}
+	return true;
+}
+
+static bool
+mtk_nand_mcu_read_data(u8 * buf, u32 length)
+{
+	int timeout = 0xffff;
+	u32 i;
+	u32 *buf32 = (u32 *) buf;
+	if ((u32) buf % 4 || length % 4)
+		NFI_SET_REG16(NFI_CNFG_REG16, CNFG_BYTE_RW);
+	else
+		NFI_CLN_REG16(NFI_CNFG_REG16, CNFG_BYTE_RW);
+
+	//DRV_WriteReg32(NFI_STRADDR_REG32, 0);
+	mb();
+	NFI_SET_REG16(NFI_CON_REG16, CON_NFI_BRD);
+
+	if ((u32) buf % 4 || length % 4) {
+		for (i = 0; (i < (length)) && (timeout > 0);) {
+			if (DRV_Reg16(NFI_PIO_DIRDY_REG16) & 1) {
+				*buf++ = (u8) DRV_Reg32(NFI_DATAR_REG32);
+				i++;
+			} else {
+				timeout--;
+			}
+			if (0 == timeout) {
+				printk(KERN_ERR "[%s] timeout\n", __FUNCTION__);
+				dump_nfi();
+				return false;
+			}
+		}
+	} else {
+		for (i = 0; (i < (length >> 2)) && (timeout > 0);) {
+			if (DRV_Reg16(NFI_PIO_DIRDY_REG16) & 1) {
+				*buf32++ = DRV_Reg32(NFI_DATAR_REG32);
+				i++;
+			} else {
+				timeout--;
+			}
+			if (0 == timeout) {
+				printk(KERN_ERR "[%s] timeout\n", __FUNCTION__);
+				dump_nfi();
+				return false;
+			}
+		}
+	}
+	return true;
+}
+
+static bool
+mtk_nand_read_page_data(struct mtd_info *mtd, u8 * pDataBuf, u32 u4Size)
+{
+	return mtk_nand_mcu_read_data(pDataBuf, u4Size);
+}
+
+static bool
+mtk_nand_mcu_write_data(struct mtd_info *mtd, const u8 * buf, u32 length)
+{
+	u32 timeout = 0xFFFF;
+	u32 i;
+	u32 *pBuf32;
+	NFI_CLN_REG16(NFI_CNFG_REG16, CNFG_BYTE_RW);
+	mb();
+	NFI_SET_REG16(NFI_CON_REG16, CON_NFI_BWR);
+	pBuf32 = (u32 *) buf;
+
+	if ((u32) buf % 4 || length % 4)
+		NFI_SET_REG16(NFI_CNFG_REG16, CNFG_BYTE_RW);
+	else
+		NFI_CLN_REG16(NFI_CNFG_REG16, CNFG_BYTE_RW);
+
+	if ((u32) buf % 4 || length % 4) {
+		for (i = 0; (i < (length)) && (timeout > 0);) {
+			if (DRV_Reg16(NFI_PIO_DIRDY_REG16) & 1) {
+				DRV_WriteReg32(NFI_DATAW_REG32, *buf++);
+				i++;
+			} else {
+				timeout--;
+			}
+			if (0 == timeout) {
+				printk(KERN_ERR "[%s] timeout\n", __FUNCTION__);
+				dump_nfi();
+				return false;
+			}
+		}
+	} else {
+		for (i = 0; (i < (length >> 2)) && (timeout > 0);) {
+			if (DRV_Reg16(NFI_PIO_DIRDY_REG16) & 1) {
+				DRV_WriteReg32(NFI_DATAW_REG32, *pBuf32++);
+				i++;
+			} else {
+				timeout--;
+			}
+			if (0 == timeout) {
+				printk(KERN_ERR "[%s] timeout\n", __FUNCTION__);
+				dump_nfi();
+				return false;
+			}
+		}
+	}
+
+	return true;
+}
+
+static bool
+mtk_nand_write_page_data(struct mtd_info *mtd, u8 * buf, u32 size)
+{
+	return mtk_nand_mcu_write_data(mtd, buf, size);
+}
+
+static void
+mtk_nand_read_fdm_data(u8 * pDataBuf, u32 u4SecNum)
+{
+	u32 i;
+	u32 *pBuf32 = (u32 *) pDataBuf;
+
+	if (pBuf32) {
+		for (i = 0; i < u4SecNum; ++i) {
+			*pBuf32++ = DRV_Reg32(NFI_FDM0L_REG32 + (i << 1));
+			*pBuf32++ = DRV_Reg32(NFI_FDM0M_REG32 + (i << 1));
+		}
+	}
+}
+
+static u8 fdm_buf[64];
+static void
+mtk_nand_write_fdm_data(struct nand_chip *chip, u8 * pDataBuf, u32 u4SecNum)
+{
+	u32 i, j;
+	u8 checksum = 0;
+	bool empty = true;
+	struct nand_oobfree *free_entry;
+	u32 *pBuf32;
+
+	memcpy(fdm_buf, pDataBuf, u4SecNum * 8);
+
+	free_entry = chip->ecc.layout->oobfree;
+	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free_entry[i].length; i++) {
+		for (j = 0; j < free_entry[i].length; j++) {
+			if (pDataBuf[free_entry[i].offset + j] != 0xFF)
+				empty = false;
+			checksum ^= pDataBuf[free_entry[i].offset + j];
+		}
+	}
+
+	if (!empty) {
+		fdm_buf[free_entry[i - 1].offset + free_entry[i - 1].length] = checksum;
+	}
+
+	pBuf32 = (u32 *) fdm_buf;
+	for (i = 0; i < u4SecNum; ++i) {
+		DRV_WriteReg32(NFI_FDM0L_REG32 + (i << 1), *pBuf32++);
+		DRV_WriteReg32(NFI_FDM0M_REG32 + (i << 1), *pBuf32++);
+	}
+}
+
+static void
+mtk_nand_stop_read(void)
+{
+	NFI_CLN_REG16(NFI_CON_REG16, CON_NFI_BRD);
+	mtk_nand_reset();
+	if (g_bHwEcc)
+		ECC_Decode_End();
+	DRV_WriteReg16(NFI_INTR_EN_REG16, 0);
+}
+
+static void
+mtk_nand_stop_write(void)
+{
+	NFI_CLN_REG16(NFI_CON_REG16, CON_NFI_BWR);
+	if (g_bHwEcc)
+		ECC_Encode_End();
+	DRV_WriteReg16(NFI_INTR_EN_REG16, 0);
+}
+
+bool
+mtk_nand_exec_read_page(struct mtd_info *mtd, u32 u4RowAddr, u32 u4PageSize, u8 * pPageBuf, u8 * pFDMBuf)
+{
+	u8 *buf;
+	bool bRet = true;
+	struct nand_chip *nand = mtd->priv;
+	u32 u4SecNum = u4PageSize >> 9;
+
+	if (((u32) pPageBuf % 16) && local_buffer_16_align)
+		buf = local_buffer_16_align;
+	else
+		buf = pPageBuf;
+	if (mtk_nand_ready_for_read(nand, u4RowAddr, 0, true, buf)) {
+		int j;
+		for (j = 0 ; j < u4SecNum; j++) {
+			if (!mtk_nand_read_page_data(mtd, buf+j*512, 512))
+				bRet = false;
+			if(g_bHwEcc && !mtk_nand_check_dececc_done(j+1))
+				bRet = false;
+			if(g_bHwEcc && !mtk_nand_check_bch_error(mtd, buf+j*512, j, u4RowAddr))
+				bRet = false;
+		}
+		if (!mtk_nand_status_ready(STA_NAND_BUSY))
+			bRet = false;
+
+		mtk_nand_read_fdm_data(pFDMBuf, u4SecNum);
+		mtk_nand_stop_read();
+	}
+
+	if (buf == local_buffer_16_align)
+		memcpy(pPageBuf, buf, u4PageSize);
+
+	return bRet;
+}
+
+int
+mtk_nand_exec_write_page(struct mtd_info *mtd, u32 u4RowAddr, u32 u4PageSize, u8 * pPageBuf, u8 * pFDMBuf)
+{
+	struct nand_chip *chip = mtd->priv;
+	u32 u4SecNum = u4PageSize >> 9;
+	u8 *buf;
+	u8 status;
+
+	MSG(WRITE, "mtk_nand_exec_write_page, page: 0x%x\n", u4RowAddr);
+
+	if (((u32) pPageBuf % 16) && local_buffer_16_align) {
+		printk(KERN_INFO "Data buffer not 16 bytes aligned: %p\n", pPageBuf);
+		memcpy(local_buffer_16_align, pPageBuf, mtd->writesize);
+		buf = local_buffer_16_align;
+	} else
+		buf = pPageBuf;
+
+	if (mtk_nand_ready_for_write(chip, u4RowAddr, 0, true, buf)) {
+		mtk_nand_write_fdm_data(chip, pFDMBuf, u4SecNum);
+		(void)mtk_nand_write_page_data(mtd, buf, u4PageSize);
+		(void)mtk_nand_check_RW_count(u4PageSize);
+		mtk_nand_stop_write();
+		(void)mtk_nand_set_command(NAND_CMD_PAGEPROG);
+		while (DRV_Reg32(NFI_STA_REG32) & STA_NAND_BUSY) ;
+	}
+
+	status = chip->waitfunc(mtd, chip);
+	if (status & NAND_STATUS_FAIL)
+		return -EIO;
+	return 0;
+}
+
+static int
+get_start_end_block(struct mtd_info *mtd, int block, int *start_blk, int *end_blk)
+{
+	struct nand_chip *chip = mtd->priv;
+	int i;
+
+	*start_blk = 0;
+        for (i = 0; i <= part_num; i++)
+        {
+		if (i == part_num)
+		{
+			// try the last reset partition
+			*end_blk = (chip->chipsize >> chip->phys_erase_shift) - 1;
+			if (*start_blk <= *end_blk)
+			{
+				if ((block >= *start_blk) && (block <= *end_blk))
+					break;
+			}
+		}
+		// skip All partition entry
+		else if (g_pasStatic_Partition[i].size == MTDPART_SIZ_FULL)
+		{
+			continue;
+		}
+                *end_blk = *start_blk + (g_pasStatic_Partition[i].size >> chip->phys_erase_shift) - 1;
+                if ((block >= *start_blk) && (block <= *end_blk))
+                        break;
+                *start_blk = *end_blk + 1;
+        }
+        if (*start_blk > *end_blk)
+	{
+                return -1;
+	}
+	return 0;
+}
+
+static int
+block_remap(struct mtd_info *mtd, int block)
+{
+	struct nand_chip *chip = mtd->priv;
+	int start_blk, end_blk;
+	int j, block_offset;
+	int bad_block = 0;
+
+	if (chip->bbt == NULL) {
+		printk("ERROR!! no bbt table for block_remap\n");
+		return -1;
+	}
+
+	if (get_start_end_block(mtd, block, &start_blk, &end_blk) < 0) {
+		printk("ERROR!! can not find start_blk and end_blk\n");
+		return -1;
+	}
+
+	block_offset = block - start_blk;
+	for (j = start_blk; j <= end_blk;j++) {
+		if (((chip->bbt[j >> 2] >> ((j<<1) & 0x6)) & 0x3) == 0x0) {
+			if (!block_offset)
+				break;
+			block_offset--;
+		} else {
+			bad_block++;
+		}
+	}
+	if (j <= end_blk) {
+		return j;
+	} else {
+		// remap to the bad block
+		for (j = end_blk; bad_block > 0; j--)
+		{
+			if (((chip->bbt[j >> 2] >> ((j<<1) & 0x6)) & 0x3) != 0x0)
+			{
+				bad_block--;
+				if (bad_block <= block_offset)
+					return j;
+			}
+		}
+	}
+
+	printk("Error!! block_remap error\n");
+	return -1;
+}
+
+int
+check_block_remap(struct mtd_info *mtd, int block)
+{
+	if (shift_on_bbt)
+		return  block_remap(mtd, block);
+	else
+		return block;
+}
+EXPORT_SYMBOL(check_block_remap);
+
+
+static int
+write_next_on_fail(struct mtd_info *mtd, char *write_buf, int page, int * to_blk)
+{
+	struct nand_chip *chip = mtd->priv;
+	int i, j, to_page = 0, first_page;
+	char *buf, *oob;
+	int start_blk = 0, end_blk;
+	int mapped_block;
+	int page_per_block_bit = chip->phys_erase_shift - chip->page_shift;
+	int block = page >> page_per_block_bit;
+
+	// find next available block in the same MTD partition 
+	mapped_block = block_remap(mtd, block);
+	if (mapped_block == -1)
+		return NAND_STATUS_FAIL;
+
+	get_start_end_block(mtd, block, &start_blk, &end_blk);
+
+	buf = kzalloc(mtd->writesize + mtd->oobsize, GFP_KERNEL | GFP_DMA);
+	if (buf == NULL)
+		return -1;
+
+	oob = buf + mtd->writesize;
+	for ((*to_blk) = block + 1; (*to_blk) <= end_blk ; (*to_blk)++)	{
+		if (nand_bbt_get(mtd, (*to_blk) << page_per_block_bit) == 0) {
+			int status;
+			status = mtk_nand_erase_hw(mtd, (*to_blk) << page_per_block_bit);
+			if (status & NAND_STATUS_FAIL)	{
+				mtk_nand_block_markbad_hw(mtd, (*to_blk) << chip->phys_erase_shift);
+				nand_bbt_set(mtd, (*to_blk) << page_per_block_bit, 0x3);
+			} else {
+				/* good block */
+				to_page = (*to_blk) << page_per_block_bit;
+				break;
+			}
+		}
+	}
+
+	if (!to_page) {
+		kfree(buf);
+		return -1;
+	}
+
+	first_page = (page >> page_per_block_bit) << page_per_block_bit;
+	for (i = 0; i < (1 << page_per_block_bit); i++) {
+		if ((first_page + i) != page) {
+			mtk_nand_read_oob_hw(mtd, chip, (first_page+i));
+			for (j = 0; j < mtd->oobsize; j++)
+				if (chip->oob_poi[j] != (unsigned char)0xff)
+					break;
+			if (j < mtd->oobsize)	{
+				mtk_nand_exec_read_page(mtd, (first_page+i), mtd->writesize, buf, oob);
+				memset(oob, 0xff, mtd->oobsize);
+				if (mtk_nand_exec_write_page(mtd, to_page + i, mtd->writesize, (u8 *)buf, oob) != 0) {
+					int ret, new_blk = 0;
+					nand_bbt_set(mtd, to_page, 0x3);
+					ret =  write_next_on_fail(mtd, buf, to_page + i, &new_blk);
+					if (ret) {
+						kfree(buf);
+						mtk_nand_block_markbad_hw(mtd, to_page << chip->page_shift);
+						return ret;
+					}
+					mtk_nand_block_markbad_hw(mtd, to_page << chip->page_shift);
+					*to_blk = new_blk;
+					to_page = ((*to_blk) <<  page_per_block_bit);
+				}
+			}
+		} else {
+			memset(chip->oob_poi, 0xff, mtd->oobsize);
+			if (mtk_nand_exec_write_page(mtd, to_page + i, mtd->writesize, (u8 *)write_buf, chip->oob_poi) != 0) {
+				int ret, new_blk = 0;
+				nand_bbt_set(mtd, to_page, 0x3);
+				ret =  write_next_on_fail(mtd, write_buf, to_page + i, &new_blk);
+				if (ret) {
+					kfree(buf);
+					mtk_nand_block_markbad_hw(mtd, to_page << chip->page_shift);
+					return ret;
+				}
+				mtk_nand_block_markbad_hw(mtd, to_page << chip->page_shift);
+				*to_blk = new_blk;
+				to_page = ((*to_blk) <<  page_per_block_bit);
+			}
+		}
+	}
+
+	kfree(buf);
+
+	return 0;
+}
+
+static int
+mtk_nand_write_page(struct mtd_info *mtd, struct nand_chip *chip, uint32_t offset,
+		int data_len, const u8 * buf, int oob_required, int page, int cached, int raw)
+{
+	int page_per_block = 1 << (chip->phys_erase_shift - chip->page_shift);
+	int block = page / page_per_block;
+	u16 page_in_block = page % page_per_block;
+	int mapped_block = block;
+
+#if defined(MTK_NAND_BMT)
+	mapped_block = get_mapping_block_index(block);
+	// write bad index into oob
+	if (mapped_block != block)
+		set_bad_index_to_oob(chip->oob_poi, block);
+	else
+		set_bad_index_to_oob(chip->oob_poi, FAKE_INDEX);
+#else
+	if (shift_on_bbt) {
+		mapped_block = block_remap(mtd, block);
+		if (mapped_block == -1)
+			return NAND_STATUS_FAIL;
+		if (nand_bbt_get(mtd, mapped_block << (chip->phys_erase_shift - chip->page_shift)) != 0x0)
+			return NAND_STATUS_FAIL;
+	}
+#endif
+	do {
+		if (mtk_nand_exec_write_page(mtd, page_in_block + mapped_block * page_per_block, mtd->writesize, (u8 *)buf, chip->oob_poi)) {
+			MSG(INIT, "write fail at block: 0x%x, page: 0x%x\n", mapped_block, page_in_block);
+#if defined(MTK_NAND_BMT)
+			if (update_bmt((page_in_block + mapped_block * page_per_block) << chip->page_shift, UPDATE_WRITE_FAIL, (u8 *) buf, chip->oob_poi)) {
+				MSG(INIT, "Update BMT success\n");
+				return 0;
+			} else {
+				MSG(INIT, "Update BMT fail\n");
+				return -EIO;
+			}
+#else
+			{
+				int new_blk;
+				nand_bbt_set(mtd, page_in_block + mapped_block * page_per_block, 0x3);
+				if (write_next_on_fail(mtd, (char *)buf, page_in_block + mapped_block * page_per_block, &new_blk) != 0)
+				{
+				mtk_nand_block_markbad_hw(mtd, (page_in_block + mapped_block * page_per_block) << chip->page_shift);
+				return NAND_STATUS_FAIL;
+				}
+				mtk_nand_block_markbad_hw(mtd, (page_in_block + mapped_block * page_per_block) << chip->page_shift);
+				break;
+			}
+#endif
+		} else
+			break;
+	} while(1);
+
+	return 0;
+}
+
+static void
+mtk_nand_command_bp(struct mtd_info *mtd, unsigned int command, int column, int page_addr)
+{
+	struct nand_chip *nand = mtd->priv;
+
+	switch (command) {
+	case NAND_CMD_SEQIN:
+		memset(g_kCMD.au1OOB, 0xFF, sizeof(g_kCMD.au1OOB));
+		g_kCMD.pDataBuf = NULL;
+		g_kCMD.u4RowAddr = page_addr;
+		g_kCMD.u4ColAddr = column;
+		break;
+
+	case NAND_CMD_PAGEPROG:
+		if (g_kCMD.pDataBuf || (0xFF != g_kCMD.au1OOB[nand_badblock_offset])) {
+			u8 *pDataBuf = g_kCMD.pDataBuf ? g_kCMD.pDataBuf : nand->buffers->databuf;
+			mtk_nand_exec_write_page(mtd, g_kCMD.u4RowAddr, mtd->writesize, pDataBuf, g_kCMD.au1OOB);
+			g_kCMD.u4RowAddr = (u32) - 1;
+			g_kCMD.u4OOBRowAddr = (u32) - 1;
+		}
+		break;
+
+	case NAND_CMD_READOOB:
+		g_kCMD.u4RowAddr = page_addr;
+		g_kCMD.u4ColAddr = column + mtd->writesize;
+		break;
+
+	case NAND_CMD_READ0:
+		g_kCMD.u4RowAddr = page_addr;
+		g_kCMD.u4ColAddr = column;
+		break;
+
+	case NAND_CMD_ERASE1:
+		nand->state=FL_ERASING;
+		(void)mtk_nand_reset();
+		mtk_nand_set_mode(CNFG_OP_ERASE);
+		(void)mtk_nand_set_command(NAND_CMD_ERASE1);
+		(void)mtk_nand_set_address(0, page_addr, 0, devinfo.addr_cycle - 2);
+		break;
+
+	case NAND_CMD_ERASE2:
+		(void)mtk_nand_set_command(NAND_CMD_ERASE2);
+		while (DRV_Reg32(NFI_STA_REG32) & STA_NAND_BUSY)
+			;
+		break;
+
+	case NAND_CMD_STATUS:
+		(void)mtk_nand_reset();
+		NFI_CLN_REG16(NFI_CNFG_REG16, CNFG_BYTE_RW);
+		mtk_nand_set_mode(CNFG_OP_SRD);
+		mtk_nand_set_mode(CNFG_READ_EN);
+		NFI_CLN_REG16(NFI_CNFG_REG16, CNFG_AHB);
+		NFI_CLN_REG16(NFI_CNFG_REG16, CNFG_HW_ECC_EN);
+		(void)mtk_nand_set_command(NAND_CMD_STATUS);
+		NFI_CLN_REG16(NFI_CON_REG16, CON_NFI_NOB_MASK);
+		mb();
+		DRV_WriteReg16(NFI_CON_REG16, CON_NFI_SRD | (1 << CON_NFI_NOB_SHIFT));
+		g_bcmdstatus = true;
+		break;
+
+	case NAND_CMD_RESET:
+		(void)mtk_nand_reset();
+		DRV_WriteReg16(NFI_INTR_EN_REG16, INTR_RST_DONE_EN);
+		(void)mtk_nand_set_command(NAND_CMD_RESET);
+		DRV_WriteReg16(NFI_BASE+0x44, 0xF1);
+		while(!(DRV_Reg16(NFI_INTR_REG16)&INTR_RST_DONE_EN))
+			;
+		break;
+
+	case NAND_CMD_READID:
+		mtk_nand_reset();
+		/* Disable HW ECC */
+		NFI_CLN_REG16(NFI_CNFG_REG16, CNFG_HW_ECC_EN);
+		NFI_CLN_REG16(NFI_CNFG_REG16, CNFG_AHB);
+		NFI_SET_REG16(NFI_CNFG_REG16, CNFG_READ_EN | CNFG_BYTE_RW);
+		(void)mtk_nand_reset();
+		mb();
+		mtk_nand_set_mode(CNFG_OP_SRD);
+		(void)mtk_nand_set_command(NAND_CMD_READID);
+		(void)mtk_nand_set_address(0, 0, 1, 0);
+		DRV_WriteReg16(NFI_CON_REG16, CON_NFI_SRD);
+		while (DRV_Reg32(NFI_STA_REG32) & STA_DATAR_STATE)
+			;
+		break;
+
+	default:
+		BUG();
+		break;
+	}
+}
+
+static void
+mtk_nand_select_chip(struct mtd_info *mtd, int chip)
+{
+	if ((chip == -1) && (false == g_bInitDone)) {
+		struct nand_chip *nand = mtd->priv;
+		struct mtk_nand_host *host = nand->priv;
+		struct mtk_nand_host_hw *hw = host->hw;
+		u32 spare_per_sector = mtd->oobsize / (mtd->writesize / 512);
+		u32 ecc_bit = 4;
+		u32 spare_bit = PAGEFMT_SPARE_16;
+
+		if (spare_per_sector >= 28) {
+			spare_bit = PAGEFMT_SPARE_28;
+			ecc_bit = 12;
+			spare_per_sector = 28;
+		} else if (spare_per_sector >= 27) {
+			spare_bit = PAGEFMT_SPARE_27;
+			ecc_bit = 8;
+			spare_per_sector = 27;
+		} else if (spare_per_sector >= 26) {
+			spare_bit = PAGEFMT_SPARE_26;
+			ecc_bit = 8;
+			spare_per_sector = 26;
+		} else if (spare_per_sector >= 16) {
+			spare_bit = PAGEFMT_SPARE_16;
+			ecc_bit = 4;
+			spare_per_sector = 16;
+		} else {
+			MSG(INIT, "[NAND]: NFI not support oobsize: %x\n", spare_per_sector);
+			ASSERT(0);
+		}
+		mtd->oobsize = spare_per_sector*(mtd->writesize/512);
+		MSG(INIT, "[NAND]select ecc bit:%d, sparesize :%d spare_per_sector=%d\n",ecc_bit,mtd->oobsize,spare_per_sector);
+		/* Setup PageFormat */
+		if (4096 == mtd->writesize) {
+			NFI_SET_REG16(NFI_PAGEFMT_REG16, (spare_bit << PAGEFMT_SPARE_SHIFT) | PAGEFMT_4K);
+			nand->cmdfunc = mtk_nand_command_bp;
+		} else if (2048 == mtd->writesize) {
+			NFI_SET_REG16(NFI_PAGEFMT_REG16, (spare_bit << PAGEFMT_SPARE_SHIFT) | PAGEFMT_2K);
+			nand->cmdfunc = mtk_nand_command_bp;
+		}
+		ECC_Config(hw,ecc_bit);
+		g_bInitDone = true;
+	}
+	switch (chip) {
+	case -1:
+		break;
+	case 0:
+	case 1:
+		/*  Jun Shen, 2011.04.13  */
+		/* Note: MT6577 EVB NAND  is mounted on CS0, but FPGA is CS1  */
+		DRV_WriteReg16(NFI_CSEL_REG16, chip);
+		/*  Jun Shen, 2011.04.13 */
+		break;
+	}
+}
+
+static uint8_t
+mtk_nand_read_byte(struct mtd_info *mtd)
+{
+	uint8_t retval = 0;
+
+	if (!mtk_nand_pio_ready()) {
+		printk("pio ready timeout\n");
+		retval = false;
+	}
+
+	if (g_bcmdstatus) {
+		retval = DRV_Reg8(NFI_DATAR_REG32);
+		NFI_CLN_REG16(NFI_CON_REG16, CON_NFI_NOB_MASK);
+		mtk_nand_reset();
+		if (g_bHwEcc) {
+			NFI_SET_REG16(NFI_CNFG_REG16, CNFG_HW_ECC_EN);
+		} else {
+			NFI_CLN_REG16(NFI_CNFG_REG16, CNFG_HW_ECC_EN);
+		}
+		g_bcmdstatus = false;
+	} else
+		retval = DRV_Reg8(NFI_DATAR_REG32);
+
+	return retval;
+}
+
+static void
+mtk_nand_read_buf(struct mtd_info *mtd, uint8_t * buf, int len)
+{
+	struct nand_chip *nand = (struct nand_chip *)mtd->priv;
+	struct NAND_CMD *pkCMD = &g_kCMD;
+	u32 u4ColAddr = pkCMD->u4ColAddr;
+	u32 u4PageSize = mtd->writesize;
+
+	if (u4ColAddr < u4PageSize) {
+		if ((u4ColAddr == 0) && (len >= u4PageSize)) {
+			mtk_nand_exec_read_page(mtd, pkCMD->u4RowAddr, u4PageSize, buf, pkCMD->au1OOB);
+			if (len > u4PageSize) {
+				u32 u4Size = min(len - u4PageSize, sizeof(pkCMD->au1OOB));
+				memcpy(buf + u4PageSize, pkCMD->au1OOB, u4Size);
+			}
+		} else {
+			mtk_nand_exec_read_page(mtd, pkCMD->u4RowAddr, u4PageSize, nand->buffers->databuf, pkCMD->au1OOB);
+			memcpy(buf, nand->buffers->databuf + u4ColAddr, len);
+		}
+		pkCMD->u4OOBRowAddr = pkCMD->u4RowAddr;
+	} else {
+		u32 u4Offset = u4ColAddr - u4PageSize;
+		u32 u4Size = min(len - u4Offset, sizeof(pkCMD->au1OOB));
+		if (pkCMD->u4OOBRowAddr != pkCMD->u4RowAddr) {
+			mtk_nand_exec_read_page(mtd, pkCMD->u4RowAddr, u4PageSize, nand->buffers->databuf, pkCMD->au1OOB);
+			pkCMD->u4OOBRowAddr = pkCMD->u4RowAddr;
+		}
+		memcpy(buf, pkCMD->au1OOB + u4Offset, u4Size);
+	}
+	pkCMD->u4ColAddr += len;
+}
+
+static void
+mtk_nand_write_buf(struct mtd_info *mtd, const uint8_t * buf, int len)
+{
+	struct NAND_CMD *pkCMD = &g_kCMD;
+	u32 u4ColAddr = pkCMD->u4ColAddr;
+	u32 u4PageSize = mtd->writesize;
+	int i4Size, i;
+
+	if (u4ColAddr >= u4PageSize) {
+		u32 u4Offset = u4ColAddr - u4PageSize;
+		u8 *pOOB = pkCMD->au1OOB + u4Offset;
+		i4Size = min(len, (int)(sizeof(pkCMD->au1OOB) - u4Offset));
+		for (i = 0; i < i4Size; i++) {
+			pOOB[i] &= buf[i];
+		}
+	} else {
+		pkCMD->pDataBuf = (u8 *) buf;
+	}
+
+	pkCMD->u4ColAddr += len;
+}
+
+static int
+mtk_nand_write_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip, const uint8_t * buf, int oob_required)
+{
+	mtk_nand_write_buf(mtd, buf, mtd->writesize);
+	mtk_nand_write_buf(mtd, chip->oob_poi, mtd->oobsize);
+	return 0;
+}
+
+static int
+mtk_nand_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip, uint8_t * buf, int oob_required, int page)
+{
+	struct NAND_CMD *pkCMD = &g_kCMD;
+	u32 u4ColAddr = pkCMD->u4ColAddr;
+	u32 u4PageSize = mtd->writesize;
+
+	if (u4ColAddr == 0) {
+		mtk_nand_exec_read_page(mtd, pkCMD->u4RowAddr, u4PageSize, buf, chip->oob_poi);
+		pkCMD->u4ColAddr += u4PageSize + mtd->oobsize;
+	}
+
+	return 0;
+}
+
+static int
+mtk_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip, u8 * buf, int page)
+{
+	int page_per_block = 1 << (chip->phys_erase_shift - chip->page_shift);
+	int block = page / page_per_block;
+	u16 page_in_block = page % page_per_block;
+	int mapped_block = block;
+
+#if defined (MTK_NAND_BMT)
+	mapped_block = get_mapping_block_index(block);
+	if (mtk_nand_exec_read_page(mtd, page_in_block + mapped_block * page_per_block,
+			mtd->writesize, buf, chip->oob_poi))
+		return 0;
+#else
+	if (shift_on_bbt) {
+		mapped_block = block_remap(mtd, block);
+		if (mapped_block == -1)
+			return NAND_STATUS_FAIL;
+		if (nand_bbt_get(mtd, mapped_block << (chip->phys_erase_shift - chip->page_shift)) != 0x0)
+			return NAND_STATUS_FAIL;
+	}
+
+	if (mtk_nand_exec_read_page(mtd, page_in_block + mapped_block * page_per_block, mtd->writesize, buf, chip->oob_poi))
+		return 0;
+	else
+		return -EIO;
+#endif
+}
+
+int
+mtk_nand_erase_hw(struct mtd_info *mtd, int page)
+{
+	struct nand_chip *chip = (struct nand_chip *)mtd->priv;
+
+	chip->erase_cmd(mtd, page);
+
+	return chip->waitfunc(mtd, chip);
+}
+
+static int
+mtk_nand_erase(struct mtd_info *mtd, int page)
+{
+	// get mapping 
+	struct nand_chip *chip = mtd->priv;
+	int page_per_block = 1 << (chip->phys_erase_shift - chip->page_shift);
+	int page_in_block = page % page_per_block;
+	int block = page / page_per_block;
+	int mapped_block = block;
+
+#if defined(MTK_NAND_BMT)    
+	mapped_block = get_mapping_block_index(block);
+#else
+	if (shift_on_bbt) {
+		mapped_block = block_remap(mtd, block);
+		if (mapped_block == -1)
+			return NAND_STATUS_FAIL;
+		if (nand_bbt_get(mtd, mapped_block << (chip->phys_erase_shift - chip->page_shift)) != 0x0)
+			return NAND_STATUS_FAIL;
+	}
+#endif
+
+	do {
+		int status = mtk_nand_erase_hw(mtd, page_in_block + page_per_block * mapped_block);
+
+		if (status & NAND_STATUS_FAIL) {
+#if defined (MTK_NAND_BMT)    	
+			if (update_bmt( (page_in_block + mapped_block * page_per_block) << chip->page_shift,
+					UPDATE_ERASE_FAIL, NULL, NULL))
+			{
+				MSG(INIT, "Erase fail at block: 0x%x, update BMT success\n", mapped_block);
+				return 0;
+			} else {
+				MSG(INIT, "Erase fail at block: 0x%x, update BMT fail\n", mapped_block);
+				return NAND_STATUS_FAIL;
+			}
+#else
+			mtk_nand_block_markbad_hw(mtd, (page_in_block + mapped_block * page_per_block) << chip->page_shift);
+			nand_bbt_set(mtd, page_in_block + mapped_block * page_per_block, 0x3);
+			if (shift_on_bbt) {
+				mapped_block = block_remap(mtd, block);
+				if (mapped_block == -1)
+					return NAND_STATUS_FAIL;
+				if (nand_bbt_get(mtd, mapped_block << (chip->phys_erase_shift - chip->page_shift)) != 0x0)
+					return NAND_STATUS_FAIL;
+			} else
+				return NAND_STATUS_FAIL;
+#endif
+		} else
+			break;
+	} while(1);
+
+	return 0;
+}
+
+static int
+mtk_nand_read_oob_raw(struct mtd_info *mtd, uint8_t * buf, int page_addr, int len)
+{
+	struct nand_chip *chip = (struct nand_chip *)mtd->priv;
+	u32 col_addr = 0;
+	u32 sector = 0;
+	int res = 0;
+	u32 colnob = 2, rawnob = devinfo.addr_cycle - 2;
+	int randomread = 0;
+	int read_len = 0;
+	int sec_num = 1<<(chip->page_shift-9);
+	int spare_per_sector = mtd->oobsize/sec_num;
+
+	if (len >  NAND_MAX_OOBSIZE || len % OOB_AVAI_PER_SECTOR || !buf) {
+		printk(KERN_WARNING "[%s] invalid parameter, len: %d, buf: %p\n", __FUNCTION__, len, buf);
+		return -EINVAL;
+	}
+	if (len > spare_per_sector)
+		randomread = 1;
+	if (!randomread || !(devinfo.advancedmode & RAMDOM_READ)) {
+		while (len > 0) {
+			read_len = min(len, spare_per_sector);
+			col_addr = NAND_SECTOR_SIZE + sector * (NAND_SECTOR_SIZE + spare_per_sector); // TODO: Fix this hard-code 16
+			if (!mtk_nand_ready_for_read(chip, page_addr, col_addr, false, NULL)) {
+				printk(KERN_WARNING "mtk_nand_ready_for_read return failed\n");
+				res = -EIO;
+				goto error;
+			}
+			if (!mtk_nand_mcu_read_data(buf + spare_per_sector * sector, read_len)) {
+				printk(KERN_WARNING "mtk_nand_mcu_read_data return failed\n");
+				res = -EIO;
+				goto error;
+			}
+			mtk_nand_check_RW_count(read_len);
+			mtk_nand_stop_read();
+			sector++;
+			len -= read_len;
+		}
+	} else {
+		col_addr = NAND_SECTOR_SIZE;
+		if (chip->options & NAND_BUSWIDTH_16)
+			col_addr /= 2;
+		if (!mtk_nand_reset())
+			goto error;
+		mtk_nand_set_mode(0x6000);
+		NFI_SET_REG16(NFI_CNFG_REG16, CNFG_READ_EN);
+		DRV_WriteReg16(NFI_CON_REG16, 4 << CON_NFI_SEC_SHIFT);
+
+		NFI_CLN_REG16(NFI_CNFG_REG16, CNFG_AHB);
+		NFI_CLN_REG16(NFI_CNFG_REG16, CNFG_HW_ECC_EN);
+
+		mtk_nand_set_autoformat(false);
+
+		if (!mtk_nand_set_command(NAND_CMD_READ0))
+			goto error;
+		//1 FIXED ME: For Any Kind of AddrCycle
+		if (!mtk_nand_set_address(col_addr, page_addr, colnob, rawnob))
+			goto error;
+		if (!mtk_nand_set_command(NAND_CMD_READSTART))
+			goto error;
+		if (!mtk_nand_status_ready(STA_NAND_BUSY))
+			goto error;
+		read_len = min(len, spare_per_sector);
+		if (!mtk_nand_mcu_read_data(buf + spare_per_sector * sector, read_len)) {
+			printk(KERN_WARNING "mtk_nand_mcu_read_data return failed first 16\n");
+			res = -EIO;
+			goto error;
+		}
+		sector++;
+		len -= read_len;
+		mtk_nand_stop_read();
+		while (len > 0) {
+			read_len = min(len,  spare_per_sector);
+			if (!mtk_nand_set_command(0x05))
+				goto error;
+			col_addr = NAND_SECTOR_SIZE + sector * (NAND_SECTOR_SIZE + spare_per_sector);
+			if (chip->options & NAND_BUSWIDTH_16)
+				col_addr /= 2;
+			DRV_WriteReg32(NFI_COLADDR_REG32, col_addr);
+			DRV_WriteReg16(NFI_ADDRNOB_REG16, 2);
+			DRV_WriteReg16(NFI_CON_REG16, 4 << CON_NFI_SEC_SHIFT);
+			if (!mtk_nand_status_ready(STA_ADDR_STATE))
+				goto error;
+			if (!mtk_nand_set_command(0xE0))
+				goto error;
+			if (!mtk_nand_status_ready(STA_NAND_BUSY))
+				goto error;
+			if (!mtk_nand_mcu_read_data(buf + spare_per_sector * sector, read_len)) {
+				printk(KERN_WARNING "mtk_nand_mcu_read_data return failed first 16\n");
+				res = -EIO;
+				goto error;
+			}
+			mtk_nand_stop_read();
+			sector++;
+			len -= read_len;
+		}
+	}
+error:
+	NFI_CLN_REG16(NFI_CON_REG16, CON_NFI_BRD);
+	return res;
+}
+
+static int
+mtk_nand_write_oob_raw(struct mtd_info *mtd, const uint8_t * buf, int page_addr, int len)
+{
+	struct nand_chip *chip = mtd->priv;
+	u32 col_addr = 0;
+	u32 sector = 0;
+	int write_len = 0;
+	int status;
+	int sec_num = 1<<(chip->page_shift-9);
+	int spare_per_sector = mtd->oobsize/sec_num;
+
+	if (len >  NAND_MAX_OOBSIZE || len % OOB_AVAI_PER_SECTOR || !buf) {
+		printk(KERN_WARNING "[%s] invalid parameter, len: %d, buf: %p\n", __FUNCTION__, len, buf);
+		return -EINVAL;
+	}
+
+	while (len > 0) {
+		write_len = min(len,  spare_per_sector);
+		col_addr = sector * (NAND_SECTOR_SIZE +  spare_per_sector) + NAND_SECTOR_SIZE;
+		if (!mtk_nand_ready_for_write(chip, page_addr, col_addr, false, NULL))
+			return -EIO;
+		if (!mtk_nand_mcu_write_data(mtd, buf + sector * spare_per_sector, write_len))
+			return -EIO;
+		(void)mtk_nand_check_RW_count(write_len);
+		NFI_CLN_REG16(NFI_CON_REG16, CON_NFI_BWR);
+		(void)mtk_nand_set_command(NAND_CMD_PAGEPROG);
+		while (DRV_Reg32(NFI_STA_REG32) & STA_NAND_BUSY)
+			;
+		status = chip->waitfunc(mtd, chip);
+		if (status & NAND_STATUS_FAIL) {
+			printk(KERN_INFO "status: %d\n", status);
+			return -EIO;
+		}
+		len -= write_len;
+		sector++;
+	}
+
+	return 0;
+}
+
+static int
+mtk_nand_write_oob_hw(struct mtd_info *mtd, struct nand_chip *chip, int page)
+{
+	int i, iter;
+	int sec_num = 1<<(chip->page_shift-9);
+	int spare_per_sector = mtd->oobsize/sec_num;
+
+	memcpy(local_oob_buf, chip->oob_poi, mtd->oobsize);
+
+	// copy ecc data
+	for (i = 0; i < chip->ecc.layout->eccbytes; i++) {
+		iter = (i / (spare_per_sector-OOB_AVAI_PER_SECTOR)) *  spare_per_sector + OOB_AVAI_PER_SECTOR + i % (spare_per_sector-OOB_AVAI_PER_SECTOR);
+		local_oob_buf[iter] = chip->oob_poi[chip->ecc.layout->eccpos[i]];
+	}
+
+	// copy FDM data
+	for (i = 0; i < sec_num; i++)
+		memcpy(&local_oob_buf[i * spare_per_sector], &chip->oob_poi[i * OOB_AVAI_PER_SECTOR], OOB_AVAI_PER_SECTOR);
+
+	return mtk_nand_write_oob_raw(mtd, local_oob_buf, page, mtd->oobsize);
+}
+
+static int mtk_nand_write_oob(struct mtd_info *mtd, struct nand_chip *chip, int page)
+{
+	int page_per_block = 1 << (chip->phys_erase_shift - chip->page_shift);
+	int block = page / page_per_block;
+	u16 page_in_block = page % page_per_block;
+	int mapped_block = block;
+
+#if defined(MTK_NAND_BMT)
+	mapped_block = get_mapping_block_index(block);
+	// write bad index into oob
+	if (mapped_block != block)
+		set_bad_index_to_oob(chip->oob_poi, block);
+	else
+		set_bad_index_to_oob(chip->oob_poi, FAKE_INDEX);
+#else
+	if (shift_on_bbt)
+	{
+		mapped_block = block_remap(mtd, block);
+		if (mapped_block == -1)
+			return NAND_STATUS_FAIL;
+		if (nand_bbt_get(mtd, mapped_block << (chip->phys_erase_shift - chip->page_shift)) != 0x0)
+			return NAND_STATUS_FAIL;
+	}
+#endif
+	do {
+		if (mtk_nand_write_oob_hw(mtd, chip, page_in_block + mapped_block * page_per_block /* page */)) {
+			MSG(INIT, "write oob fail at block: 0x%x, page: 0x%x\n", mapped_block, page_in_block);
+#if defined(MTK_NAND_BMT)      
+			if (update_bmt((page_in_block + mapped_block * page_per_block) << chip->page_shift,
+					UPDATE_WRITE_FAIL, NULL, chip->oob_poi))
+			{
+				MSG(INIT, "Update BMT success\n");
+				return 0;
+			} else {
+				MSG(INIT, "Update BMT fail\n");
+				return -EIO;
+			}
+#else
+			mtk_nand_block_markbad_hw(mtd, (page_in_block + mapped_block * page_per_block) << chip->page_shift);
+			nand_bbt_set(mtd, page_in_block + mapped_block * page_per_block, 0x3);
+			if (shift_on_bbt) {
+				mapped_block = block_remap(mtd, mapped_block);
+				if (mapped_block == -1)
+					return NAND_STATUS_FAIL;
+				if (nand_bbt_get(mtd, mapped_block << (chip->phys_erase_shift - chip->page_shift)) != 0x0)
+					return NAND_STATUS_FAIL;
+			} else {
+				return NAND_STATUS_FAIL;
+			}
+#endif
+		} else
+			break;
+	} while (1);
+
+	return 0;
+}
+
+int
+mtk_nand_block_markbad_hw(struct mtd_info *mtd, loff_t offset)
+{
+	struct nand_chip *chip = mtd->priv;
+	int block = (int)offset >> chip->phys_erase_shift;
+	int page = block * (1 << (chip->phys_erase_shift - chip->page_shift));
+	u8 buf[8];
+
+	memset(buf, 0xFF, 8);
+	buf[0] = 0;
+	return  mtk_nand_write_oob_raw(mtd, buf, page, 8);
+}
+
+static int
+mtk_nand_block_markbad(struct mtd_info *mtd, loff_t offset)
+{
+	struct nand_chip *chip = mtd->priv;
+	int block = (int)offset >> chip->phys_erase_shift;
+	int ret;
+	int mapped_block = block;
+
+	nand_get_device(chip, mtd, FL_WRITING);
+
+#if defined(MTK_NAND_BMT)    
+	mapped_block = get_mapping_block_index(block);
+	ret = mtk_nand_block_markbad_hw(mtd, mapped_block << chip->phys_erase_shift);
+#else
+	if (shift_on_bbt) {
+		mapped_block = block_remap(mtd, block);
+		if (mapped_block == -1) {
+			printk("NAND mark bad failed\n");
+			nand_release_device(mtd);
+			return NAND_STATUS_FAIL;
+		}
+	}
+	ret = mtk_nand_block_markbad_hw(mtd, mapped_block << chip->phys_erase_shift);
+#endif
+	nand_release_device(mtd);
+
+	return ret;
+}
+
+int
+mtk_nand_read_oob_hw(struct mtd_info *mtd, struct nand_chip *chip, int page)
+{
+	int i;
+	u8 iter = 0;
+
+	int sec_num = 1<<(chip->page_shift-9);
+	int spare_per_sector = mtd->oobsize/sec_num;
+
+	if (mtk_nand_read_oob_raw(mtd, chip->oob_poi, page, mtd->oobsize)) {
+		printk(KERN_ERR "[%s]mtk_nand_read_oob_raw return failed\n", __FUNCTION__);
+		return -EIO;
+	}
+
+	// adjust to ecc physical layout to memory layout
+	/*********************************************************/
+	/* FDM0 | ECC0 | FDM1 | ECC1 | FDM2 | ECC2 | FDM3 | ECC3 */
+	/*  8B  |  8B  |  8B  |  8B  |  8B  |  8B  |  8B  |  8B  */
+	/*********************************************************/
+
+	memcpy(local_oob_buf, chip->oob_poi, mtd->oobsize);
+	// copy ecc data
+	for (i = 0; i < chip->ecc.layout->eccbytes; i++) {
+		iter = (i / (spare_per_sector-OOB_AVAI_PER_SECTOR)) *  spare_per_sector + OOB_AVAI_PER_SECTOR + i % (spare_per_sector-OOB_AVAI_PER_SECTOR);
+		chip->oob_poi[chip->ecc.layout->eccpos[i]] = local_oob_buf[iter];
+	}
+
+	// copy FDM data
+	for (i = 0; i < sec_num; i++) {
+		memcpy(&chip->oob_poi[i * OOB_AVAI_PER_SECTOR], &local_oob_buf[i *  spare_per_sector], OOB_AVAI_PER_SECTOR);
+	}
+
+	return 0;
+}
+
+static int
+mtk_nand_read_oob(struct mtd_info *mtd, struct nand_chip *chip, int page)
+{
+	int page_per_block = 1 << (chip->phys_erase_shift - chip->page_shift);
+	int block = page / page_per_block;
+	u16 page_in_block = page % page_per_block;
+	int mapped_block = block;
+
+#if defined (MTK_NAND_BMT)
+	mapped_block = get_mapping_block_index(block);
+	mtk_nand_read_oob_hw(mtd, chip, page_in_block + mapped_block * page_per_block);
+#else
+	if (shift_on_bbt) {
+		mapped_block = block_remap(mtd, block);
+		if (mapped_block == -1)
+			return NAND_STATUS_FAIL;
+		// allow to read oob even if the block is bad
+	}
+	if (mtk_nand_read_oob_hw(mtd, chip, page_in_block + mapped_block * page_per_block)!=0)
+		return -1;
+#endif
+	return 0;
+}
+
+int
+mtk_nand_block_bad_hw(struct mtd_info *mtd, loff_t ofs)
+{
+	struct nand_chip *chip = (struct nand_chip *)mtd->priv;
+	int page_addr = (int)(ofs >> chip->page_shift);
+	unsigned int page_per_block = 1 << (chip->phys_erase_shift - chip->page_shift);
+	unsigned char oob_buf[8];
+
+	page_addr &= ~(page_per_block - 1);
+	if (mtk_nand_read_oob_raw(mtd, oob_buf, page_addr, sizeof(oob_buf))) {
+		printk(KERN_WARNING "mtk_nand_read_oob_raw return error\n");
+		return 1;
+	}
+
+	if (oob_buf[0] != 0xff) {
+		printk(KERN_WARNING "Bad block detected at 0x%x, oob_buf[0] is 0x%x\n", page_addr, oob_buf[0]);
+		// dump_nfi();
+		return 1;
+	}
+
+	return 0;
+}
+
+static int
+mtk_nand_block_bad(struct mtd_info *mtd, loff_t ofs, int getchip)
+{
+	int chipnr = 0;
+	struct nand_chip *chip = (struct nand_chip *)mtd->priv;
+	int block = (int)ofs >> chip->phys_erase_shift;
+	int mapped_block = block;
+	int ret;
+
+	if (getchip) {
+		chipnr = (int)(ofs >> chip->chip_shift);
+		nand_get_device(chip, mtd, FL_READING);
+		/* Select the NAND device */
+		chip->select_chip(mtd, chipnr);
+	}
+
+#if defined(MTK_NAND_BMT)    
+	mapped_block = get_mapping_block_index(block);
+#else
+	if (shift_on_bbt) {
+		mapped_block = block_remap(mtd, block);
+		if (mapped_block == -1) {
+		if (getchip)
+			nand_release_device(mtd);
+			return NAND_STATUS_FAIL;
+		}
+	}
+#endif
+
+	ret = mtk_nand_block_bad_hw(mtd, mapped_block << chip->phys_erase_shift);
+#if defined (MTK_NAND_BMT)	
+	if (ret) {
+		MSG(INIT, "Unmapped bad block: 0x%x\n", mapped_block);
+		if (update_bmt(mapped_block << chip->phys_erase_shift, UPDATE_UNMAPPED_BLOCK, NULL, NULL)) {
+			MSG(INIT, "Update BMT success\n");
+			ret = 0;
+		} else {
+			MSG(INIT, "Update BMT fail\n");
+			ret = 1;
+		}
+	}
+#endif
+
+	if (getchip)
+		nand_release_device(mtd);
+
+	return ret;
+}
+
+#ifdef CONFIG_MTD_NAND_VERIFY_WRITE
+char gacBuf[4096 + 288];
+
+static int
+mtk_nand_verify_buf(struct mtd_info *mtd, const uint8_t * buf, int len)
+{
+	struct nand_chip *chip = (struct nand_chip *)mtd->priv;
+	struct NAND_CMD *pkCMD = &g_kCMD;
+	u32 u4PageSize = mtd->writesize;
+	u32 *pSrc, *pDst;
+	int i;
+
+	mtk_nand_exec_read_page(mtd, pkCMD->u4RowAddr, u4PageSize, gacBuf, gacBuf + u4PageSize);
+
+	pSrc = (u32 *) buf;
+	pDst = (u32 *) gacBuf;
+	len = len / sizeof(u32);
+	for (i = 0; i < len; ++i) {
+		if (*pSrc != *pDst) {
+			MSG(VERIFY, "mtk_nand_verify_buf page fail at page %d\n", pkCMD->u4RowAddr);
+			return -1;
+		}
+		pSrc++;
+		pDst++;
+	}
+
+	pSrc = (u32 *) chip->oob_poi;
+	pDst = (u32 *) (gacBuf + u4PageSize);
+
+	if ((pSrc[0] != pDst[0]) || (pSrc[1] != pDst[1]) || (pSrc[2] != pDst[2]) || (pSrc[3] != pDst[3]) || (pSrc[4] != pDst[4]) || (pSrc[5] != pDst[5])) {
+	// TODO: Ask Designer Why?
+	//(pSrc[6] != pDst[6]) || (pSrc[7] != pDst[7])) 
+		MSG(VERIFY, "mtk_nand_verify_buf oob fail at page %d\n", pkCMD->u4RowAddr);
+		MSG(VERIFY, "0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x\n", pSrc[0], pSrc[1], pSrc[2], pSrc[3], pSrc[4], pSrc[5], pSrc[6], pSrc[7]);
+		MSG(VERIFY, "0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x\n", pDst[0], pDst[1], pDst[2], pDst[3], pDst[4], pDst[5], pDst[6], pDst[7]);
+		return -1;
+	}
+	return 0;
+}
+#endif
+
+static void
+mtk_nand_init_hw(struct mtk_nand_host *host) {
+	struct mtk_nand_host_hw *hw = host->hw;
+	u32 data;
+
+	data = DRV_Reg32(RALINK_SYSCTL_BASE+0x60);
+	data &= ~((0x3<<18)|(0x3<<16));
+	data |= ((0x2<<18) |(0x2<<16));
+	DRV_WriteReg32(RALINK_SYSCTL_BASE+0x60, data);
+
+	MSG(INIT, "Enable NFI Clock\n");
+	nand_enable_clock();
+
+	g_bInitDone = false;
+	g_kCMD.u4OOBRowAddr = (u32) - 1;
+
+	/* Set default NFI access timing control */
+	DRV_WriteReg32(NFI_ACCCON_REG32, hw->nfi_access_timing);
+	DRV_WriteReg16(NFI_CNFG_REG16, 0);
+	DRV_WriteReg16(NFI_PAGEFMT_REG16, 0);
+
+	/* Reset the state machine and data FIFO, because flushing FIFO */
+	(void)mtk_nand_reset();
+
+	/* Set the ECC engine */
+	if (hw->nand_ecc_mode == NAND_ECC_HW) {
+		MSG(INIT, "%s : Use HW ECC\n", MODULE_NAME);
+		if (g_bHwEcc)
+			NFI_SET_REG32(NFI_CNFG_REG16, CNFG_HW_ECC_EN);
+		ECC_Config(host->hw,4);
+		mtk_nand_configure_fdm(8);
+		mtk_nand_configure_lock();
+	}
+
+	NFI_SET_REG16(NFI_IOCON_REG16, 0x47);
+}
+
+static int mtk_nand_dev_ready(struct mtd_info *mtd)
+{
+	return !(DRV_Reg32(NFI_STA_REG32) & STA_NAND_BUSY);
+}
+
+#define FACT_BBT_BLOCK_NUM  32 // use the latest 32 BLOCK for factory bbt table
+#define FACT_BBT_OOB_SIGNATURE  1
+#define FACT_BBT_SIGNATURE_LEN  7
+const u8 oob_signature[] = "mtknand";
+static u8 *fact_bbt = 0;
+static u32 bbt_size = 0;
+
+static int
+read_fact_bbt(struct mtd_info *mtd, unsigned int page)
+{
+	struct nand_chip *chip = mtd->priv;
+
+	// read oob
+	if (mtk_nand_read_oob_hw(mtd, chip, page)==0)
+	{
+		if (chip->oob_poi[nand_badblock_offset] != 0xFF)
+		{
+			printk("Bad Block on Page %x\n", page);
+			return -1;
+		}
+		if (memcmp(&chip->oob_poi[FACT_BBT_OOB_SIGNATURE], oob_signature, FACT_BBT_SIGNATURE_LEN) != 0)
+		{
+			printk("compare signature failed %x\n", page);
+			return -1;
+		}
+		if (mtk_nand_exec_read_page(mtd, page, mtd->writesize, chip->buffers->databuf, chip->oob_poi))
+		{
+			printk("Signature matched and data read!\n");
+			memcpy(fact_bbt, chip->buffers->databuf, (bbt_size <= mtd->writesize)? bbt_size:mtd->writesize);
+			return 0;
+		}
+
+	}
+	printk("failed at page %x\n", page);
+	return -1;
+}
+
+static int
+load_fact_bbt(struct mtd_info *mtd)
+{
+	struct nand_chip *chip = mtd->priv;
+	int i;
+	u32 total_block;
+
+	total_block = 1 << (chip->chip_shift - chip->phys_erase_shift);
+	bbt_size = total_block >> 2;
+
+	if ((!fact_bbt) && (bbt_size))
+		fact_bbt = (u8 *)kmalloc(bbt_size, GFP_KERNEL);
+	if (!fact_bbt)
+		return -1;
+
+	for (i = total_block - 1; i >= (total_block - FACT_BBT_BLOCK_NUM); i--)
+	{
+		if (read_fact_bbt(mtd, i << (chip->phys_erase_shift - chip->page_shift)) == 0)
+		{
+			printk("load_fact_bbt success %d\n", i);
+			return 0;
+		}
+
+	}
+	printk("load_fact_bbt failed\n");
+	return -1;
+}
+
+static int
+mtk_nand_probe(struct platform_device *pdev)
+{
+	struct mtd_part_parser_data ppdata;
+	struct mtk_nand_host_hw *hw;
+	struct mtd_info *mtd;
+	struct nand_chip *nand_chip;
+	u8 ext_id1, ext_id2, ext_id3;
+	int err = 0;
+	int id;
+	u32 ext_id;
+	int i;
+	u32 data;
+
+	data = DRV_Reg32(RALINK_SYSCTL_BASE+0x60);
+	data &= ~((0x3<<18)|(0x3<<16));
+	data |= ((0x2<<18) |(0x2<<16));
+	DRV_WriteReg32(RALINK_SYSCTL_BASE+0x60, data);
+
+	hw = &mt7621_nand_hw,
+	BUG_ON(!hw);
+	/* Allocate memory for the device structure (and zero it) */
+	host = kzalloc(sizeof(struct mtk_nand_host), GFP_KERNEL);
+	if (!host) {
+		MSG(INIT, "mtk_nand: failed to allocate device structure.\n");
+		return -ENOMEM;
+	}
+
+	/* Allocate memory for 16 byte aligned buffer */
+	local_buffer_16_align = local_buffer + 16 - ((u32) local_buffer % 16);
+	printk(KERN_INFO "Allocate 16 byte aligned buffer: %p\n", local_buffer_16_align);
+	host->hw = hw;
+
+	/* init mtd data structure */
+	nand_chip = &host->nand_chip;
+	nand_chip->priv = host;     /* link the private data structures */
+
+	mtd = &host->mtd;
+	mtd->priv = nand_chip;
+	mtd->owner = THIS_MODULE;
+	mtd->name  = "MT7621-NAND";
+
+	hw->nand_ecc_mode = NAND_ECC_HW;
+
+	/* Set address of NAND IO lines */
+	nand_chip->IO_ADDR_R = (void __iomem *)NFI_DATAR_REG32;
+	nand_chip->IO_ADDR_W = (void __iomem *)NFI_DATAW_REG32;
+	nand_chip->chip_delay = 20; /* 20us command delay time */
+	nand_chip->ecc.mode = hw->nand_ecc_mode;    /* enable ECC */
+	nand_chip->ecc.strength = 1;
+	nand_chip->read_byte = mtk_nand_read_byte;
+	nand_chip->read_buf = mtk_nand_read_buf;
+	nand_chip->write_buf = mtk_nand_write_buf;
+#ifdef CONFIG_MTD_NAND_VERIFY_WRITE
+	nand_chip->verify_buf = mtk_nand_verify_buf;
+#endif
+	nand_chip->select_chip = mtk_nand_select_chip;
+	nand_chip->dev_ready = mtk_nand_dev_ready;
+	nand_chip->cmdfunc = mtk_nand_command_bp;
+	nand_chip->ecc.read_page = mtk_nand_read_page_hwecc;
+	nand_chip->ecc.write_page = mtk_nand_write_page_hwecc;
+
+	nand_chip->ecc.layout = &nand_oob_64;
+	nand_chip->ecc.size = hw->nand_ecc_size;    //2048
+	nand_chip->ecc.bytes = hw->nand_ecc_bytes;  //32
+
+	// For BMT, we need to revise driver architecture
+	nand_chip->write_page = mtk_nand_write_page;
+	nand_chip->ecc.write_oob = mtk_nand_write_oob;
+	nand_chip->block_markbad = mtk_nand_block_markbad;   // need to add nand_get_device()/nand_release_device().
+	//	nand_chip->erase = mtk_nand_erase;	
+	//    nand_chip->read_page = mtk_nand_read_page;
+	nand_chip->ecc.read_oob = mtk_nand_read_oob;
+	nand_chip->block_bad = mtk_nand_block_bad;
+
+	//Qwert:Add for Uboot
+	mtk_nand_init_hw(host);
+	/* Select the device */
+	nand_chip->select_chip(mtd, NFI_DEFAULT_CS);
+
+	/*
+	* Reset the chip, required by some chips (e.g. Micron MT29FxGxxxxx)
+	* after power-up
+	*/
+	nand_chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
+
+	memset(&devinfo, 0 , sizeof(flashdev_info));
+
+	/* Send the command for reading device ID */
+
+	nand_chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);
+
+	/* Read manufacturer and device IDs */
+	manu_id = nand_chip->read_byte(mtd);
+	dev_id = nand_chip->read_byte(mtd);
+	id = dev_id | (manu_id << 8);
+	        ext_id1 = nand_chip->read_byte(mtd);
+		    ext_id2 = nand_chip->read_byte(mtd);
+		        ext_id3 = nand_chip->read_byte(mtd);
+			    ext_id = ext_id1 << 16 | ext_id2 << 8 | ext_id3;
+	if (!get_device_info(id, ext_id, &devinfo)) {
+		u32 chip_mode = RALINK_REG(RALINK_SYSCTL_BASE+0x010)&0x0F;
+		MSG(INIT, "Not Support this Device! \r\n");
+		memset(&devinfo, 0 , sizeof(flashdev_info));
+		MSG(INIT, "chip_mode=%08X\n",chip_mode);
+
+		/* apply bootstrap first */
+		devinfo.addr_cycle = 5;
+		devinfo.iowidth = 8;
+
+		switch (chip_mode) {
+		case 10:
+			devinfo.pagesize = 2048;
+			devinfo.sparesize = 128;
+			devinfo.totalsize = 128;
+			devinfo.blocksize = 128;
+			break;
+		case 11:
+			devinfo.pagesize = 4096;
+			devinfo.sparesize = 128;
+			devinfo.totalsize = 1024;
+			devinfo.blocksize = 256;
+			break;
+		case 12:
+			devinfo.pagesize = 4096;
+			devinfo.sparesize = 224;
+			devinfo.totalsize = 2048;
+			devinfo.blocksize = 512;
+			break;
+		default:
+		case 1:
+			devinfo.pagesize = 2048;
+			devinfo.sparesize = 64;
+			devinfo.totalsize = 128;
+			devinfo.blocksize = 128;
+			break;
+		}
+
+		devinfo.timmingsetting = NFI_DEFAULT_ACCESS_TIMING;
+		devinfo.devciename[0] = 'U';
+		devinfo.advancedmode = 0;
+	}
+	mtd->writesize = devinfo.pagesize;
+	mtd->erasesize = (devinfo.blocksize<<10);
+	mtd->oobsize = devinfo.sparesize;
+
+	nand_chip->chipsize = (devinfo.totalsize<<20);
+	nand_chip->page_shift = ffs(mtd->writesize) - 1;
+	nand_chip->pagemask = (nand_chip->chipsize >> nand_chip->page_shift) - 1;
+	nand_chip->phys_erase_shift = ffs(mtd->erasesize) - 1;
+	nand_chip->chip_shift = ffs(nand_chip->chipsize) - 1;//0x1C;//ffs(nand_chip->chipsize) - 1;
+	nand_chip->oob_poi = nand_chip->buffers->databuf + mtd->writesize;
+	nand_chip->badblockpos = 0;
+
+	if (devinfo.pagesize == 4096)
+		nand_chip->ecc.layout = &nand_oob_128;
+	else if (devinfo.pagesize == 2048)
+		nand_chip->ecc.layout = &nand_oob_64;
+	else if (devinfo.pagesize == 512)
+		nand_chip->ecc.layout = &nand_oob_16;
+
+	nand_chip->ecc.layout->eccbytes = devinfo.sparesize-OOB_AVAI_PER_SECTOR*(devinfo.pagesize/NAND_SECTOR_SIZE);
+	for (i = 0; i < nand_chip->ecc.layout->eccbytes; i++)
+		nand_chip->ecc.layout->eccpos[i]=OOB_AVAI_PER_SECTOR*(devinfo.pagesize/NAND_SECTOR_SIZE)+i;
+
+	MSG(INIT, "Support this Device in MTK table! %x \r\n", id);
+	hw->nfi_bus_width = devinfo.iowidth;
+	DRV_WriteReg32(NFI_ACCCON_REG32, devinfo.timmingsetting);
+
+	/* 16-bit bus width */
+	if (hw->nfi_bus_width == 16) {
+		MSG(INIT, "%s : Set the 16-bit I/O settings!\n", MODULE_NAME);
+		nand_chip->options |= NAND_BUSWIDTH_16;
+	}
+	mtd->oobsize = devinfo.sparesize;
+	hw->nfi_cs_num = 1;
+
+	/* Scan to find existance of the device */
+	if (nand_scan(mtd, hw->nfi_cs_num)) {
+		MSG(INIT, "%s : nand_scan fail.\n", MODULE_NAME);
+		err = -ENXIO;
+		goto out;
+	}
+
+	g_page_size = mtd->writesize;
+	platform_set_drvdata(pdev, host);
+	if (hw->nfi_bus_width == 16) {
+		NFI_SET_REG16(NFI_PAGEFMT_REG16, PAGEFMT_DBYTE_EN);
+	}
+
+	nand_chip->select_chip(mtd, 0);
+#if defined(MTK_NAND_BMT)  
+	nand_chip->chipsize -= (BMT_POOL_SIZE) << nand_chip->phys_erase_shift;
+#endif
+	mtd->size = nand_chip->chipsize;
+
+	CFG_BLOCKSIZE = mtd->erasesize;
+
+#if defined(MTK_NAND_BMT)
+	if (!g_bmt) {
+		if (!(g_bmt = init_bmt(nand_chip, BMT_POOL_SIZE))) {
+			MSG(INIT, "Error: init bmt failed\n");
+			return 0;
+		}
+	}
+#endif
+
+	ppdata.of_node = pdev->dev.of_node;
+	err = mtd_device_parse_register(mtd, probe_types, &ppdata,
+					NULL, 0);
+	if (!err) {
+		MSG(INIT, "[mtk_nand] probe successfully!\n");
+		nand_disable_clock();
+		shift_on_bbt = 1;
+		if (load_fact_bbt(mtd) == 0) {
+			int i;
+			for (i = 0; i < 0x100; i++)
+				nand_chip->bbt[i] |= fact_bbt[i];
+		}
+
+		return err;
+	}
+
+out:
+	MSG(INIT, "[NFI] mtk_nand_probe fail, err = %d!\n", err);
+	nand_release(mtd);
+	platform_set_drvdata(pdev, NULL);
+	kfree(host);
+	nand_disable_clock();
+	return err;
+}
+
+static int
+mtk_nand_remove(struct platform_device *pdev)
+{
+	struct mtk_nand_host *host = platform_get_drvdata(pdev);
+	struct mtd_info *mtd = &host->mtd;
+
+	nand_release(mtd);
+	kfree(host);
+	nand_disable_clock();
+
+	return 0;
+}
+
+static const struct of_device_id mt7621_nand_match[] = {
+	{ .compatible = "mtk,mt7621-nand" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, mt7621_nand_match);
+
+static struct platform_driver mtk_nand_driver = {
+	.probe = mtk_nand_probe,
+	.remove = mtk_nand_remove,
+	.driver = {
+		.name = "MT7621-NAND",
+		.owner = THIS_MODULE,
+		.of_match_table = mt7621_nand_match,
+	},
+};
+
+static int __init
+mtk_nand_init(void)
+{
+	printk("MediaTek Nand driver init, version %s\n", VERSION);
+
+	return platform_driver_register(&mtk_nand_driver);
+}
+
+static void __exit
+mtk_nand_exit(void)
+{
+	platform_driver_unregister(&mtk_nand_driver);
+}
+
+module_init(mtk_nand_init);
+module_exit(mtk_nand_exit);
+MODULE_LICENSE("GPL");
--- /dev/null
+++ b/drivers/mtd/nand/mtk_nand.h
@@ -0,0 +1,452 @@
+#ifndef __MTK_NAND_H
+#define __MTK_NAND_H
+
+#define RALINK_NAND_CTRL_BASE         0xBE003000
+#define RALINK_SYSCTL_BASE            0xBE000000
+#define RALINK_NANDECC_CTRL_BASE      0xBE003800
+/*******************************************************************************
+ * NFI Register Definition 
+ *******************************************************************************/
+
+#define NFI_CNFG_REG16  	((volatile P_U16)(NFI_BASE+0x0000))
+#define NFI_PAGEFMT_REG16   ((volatile P_U16)(NFI_BASE+0x0004))
+#define NFI_CON_REG16      	((volatile P_U16)(NFI_BASE+0x0008))
+#define NFI_ACCCON_REG32   	((volatile P_U32)(NFI_BASE+0x000C))
+#define NFI_INTR_EN_REG16   ((volatile P_U16)(NFI_BASE+0x0010))
+#define NFI_INTR_REG16      ((volatile P_U16)(NFI_BASE+0x0014))
+
+#define NFI_CMD_REG16   	((volatile P_U16)(NFI_BASE+0x0020))
+
+#define NFI_ADDRNOB_REG16   ((volatile P_U16)(NFI_BASE+0x0030))
+#define NFI_COLADDR_REG32  	((volatile P_U32)(NFI_BASE+0x0034))
+#define NFI_ROWADDR_REG32  	((volatile P_U32)(NFI_BASE+0x0038))
+
+#define NFI_STRDATA_REG16   ((volatile P_U16)(NFI_BASE+0x0040))
+
+#define NFI_DATAW_REG32    	((volatile P_U32)(NFI_BASE+0x0050))
+#define NFI_DATAR_REG32    	((volatile P_U32)(NFI_BASE+0x0054))
+#define NFI_PIO_DIRDY_REG16 ((volatile P_U16)(NFI_BASE+0x0058))
+
+#define NFI_STA_REG32      	((volatile P_U32)(NFI_BASE+0x0060))
+#define NFI_FIFOSTA_REG16   ((volatile P_U16)(NFI_BASE+0x0064))
+#define NFI_LOCKSTA_REG16   ((volatile P_U16)(NFI_BASE+0x0068))
+
+#define NFI_ADDRCNTR_REG16  ((volatile P_U16)(NFI_BASE+0x0070))
+
+#define NFI_STRADDR_REG32  	((volatile P_U32)(NFI_BASE+0x0080))
+#define NFI_BYTELEN_REG16   ((volatile P_U16)(NFI_BASE+0x0084))
+
+#define NFI_CSEL_REG16      ((volatile P_U16)(NFI_BASE+0x0090))
+#define NFI_IOCON_REG16     ((volatile P_U16)(NFI_BASE+0x0094))
+
+#define NFI_FDM0L_REG32    	((volatile P_U32)(NFI_BASE+0x00A0))
+#define NFI_FDM0M_REG32    	((volatile P_U32)(NFI_BASE+0x00A4))
+
+#define NFI_LOCK_REG16	  	((volatile P_U16)(NFI_BASE+0x0100))
+#define NFI_LOCKCON_REG32  	((volatile P_U32)(NFI_BASE+0x0104))
+#define NFI_LOCKANOB_REG16  ((volatile P_U16)(NFI_BASE+0x0108))
+#define NFI_LOCK00ADD_REG32 ((volatile P_U32)(NFI_BASE+0x0110))
+#define NFI_LOCK00FMT_REG32 ((volatile P_U32)(NFI_BASE+0x0114))
+#define NFI_LOCK01ADD_REG32 ((volatile P_U32)(NFI_BASE+0x0118))
+#define NFI_LOCK01FMT_REG32 ((volatile P_U32)(NFI_BASE+0x011C))
+#define NFI_LOCK02ADD_REG32 ((volatile P_U32)(NFI_BASE+0x0120))
+#define NFI_LOCK02FMT_REG32 ((volatile P_U32)(NFI_BASE+0x0124))
+#define NFI_LOCK03ADD_REG32 ((volatile P_U32)(NFI_BASE+0x0128))
+#define NFI_LOCK03FMT_REG32 ((volatile P_U32)(NFI_BASE+0x012C))
+#define NFI_LOCK04ADD_REG32 ((volatile P_U32)(NFI_BASE+0x0130))
+#define NFI_LOCK04FMT_REG32 ((volatile P_U32)(NFI_BASE+0x0134))
+#define NFI_LOCK05ADD_REG32 ((volatile P_U32)(NFI_BASE+0x0138))
+#define NFI_LOCK05FMT_REG32 ((volatile P_U32)(NFI_BASE+0x013C))
+#define NFI_LOCK06ADD_REG32 ((volatile P_U32)(NFI_BASE+0x0140))
+#define NFI_LOCK06FMT_REG32 ((volatile P_U32)(NFI_BASE+0x0144))
+#define NFI_LOCK07ADD_REG32 ((volatile P_U32)(NFI_BASE+0x0148))
+#define NFI_LOCK07FMT_REG32 ((volatile P_U32)(NFI_BASE+0x014C))
+#define NFI_LOCK08ADD_REG32 ((volatile P_U32)(NFI_BASE+0x0150))
+#define NFI_LOCK08FMT_REG32 ((volatile P_U32)(NFI_BASE+0x0154))
+#define NFI_LOCK09ADD_REG32 ((volatile P_U32)(NFI_BASE+0x0158))
+#define NFI_LOCK09FMT_REG32 ((volatile P_U32)(NFI_BASE+0x015C))
+#define NFI_LOCK10ADD_REG32 ((volatile P_U32)(NFI_BASE+0x0160))
+#define NFI_LOCK10FMT_REG32 ((volatile P_U32)(NFI_BASE+0x0164))
+#define NFI_LOCK11ADD_REG32 ((volatile P_U32)(NFI_BASE+0x0168))
+#define NFI_LOCK11FMT_REG32 ((volatile P_U32)(NFI_BASE+0x016C))
+#define NFI_LOCK12ADD_REG32 ((volatile P_U32)(NFI_BASE+0x0170))
+#define NFI_LOCK12FMT_REG32 ((volatile P_U32)(NFI_BASE+0x0174))
+#define NFI_LOCK13ADD_REG32 ((volatile P_U32)(NFI_BASE+0x0178))
+#define NFI_LOCK13FMT_REG32 ((volatile P_U32)(NFI_BASE+0x017C))
+#define NFI_LOCK14ADD_REG32 ((volatile P_U32)(NFI_BASE+0x0180))
+#define NFI_LOCK14FMT_REG32 ((volatile P_U32)(NFI_BASE+0x0184))
+#define NFI_LOCK15ADD_REG32 ((volatile P_U32)(NFI_BASE+0x0188))
+#define NFI_LOCK15FMT_REG32 ((volatile P_U32)(NFI_BASE+0x018C))
+
+#define NFI_FIFODATA0_REG32 ((volatile P_U32)(NFI_BASE+0x0190))
+#define NFI_FIFODATA1_REG32 ((volatile P_U32)(NFI_BASE+0x0194))
+#define NFI_FIFODATA2_REG32 ((volatile P_U32)(NFI_BASE+0x0198))
+#define NFI_FIFODATA3_REG32 ((volatile P_U32)(NFI_BASE+0x019C))
+#define NFI_MASTERSTA_REG16 ((volatile P_U16)(NFI_BASE+0x0210))
+
+
+/*******************************************************************************
+ * NFI Register Field Definition 
+ *******************************************************************************/
+
+/* NFI_CNFG */
+#define CNFG_AHB             (0x0001)
+#define CNFG_READ_EN         (0x0002)
+#define CNFG_DMA_BURST_EN    (0x0004)
+#define CNFG_BYTE_RW         (0x0040)
+#define CNFG_HW_ECC_EN       (0x0100)
+#define CNFG_AUTO_FMT_EN     (0x0200)
+#define CNFG_OP_IDLE         (0x0000)
+#define CNFG_OP_READ         (0x1000)
+#define CNFG_OP_SRD          (0x2000)
+#define CNFG_OP_PRGM         (0x3000)
+#define CNFG_OP_ERASE        (0x4000)
+#define CNFG_OP_RESET        (0x5000)
+#define CNFG_OP_CUST         (0x6000)
+#define CNFG_OP_MODE_MASK    (0x7000)
+#define CNFG_OP_MODE_SHIFT   (12)
+
+/* NFI_PAGEFMT */
+#define PAGEFMT_512          (0x0000)
+#define PAGEFMT_2K           (0x0001)
+#define PAGEFMT_4K           (0x0002)
+
+#define PAGEFMT_PAGE_MASK    (0x0003)
+
+#define PAGEFMT_DBYTE_EN     (0x0008)
+
+#define PAGEFMT_SPARE_16     (0x0000)
+#define PAGEFMT_SPARE_26     (0x0001)
+#define PAGEFMT_SPARE_27     (0x0002)
+#define PAGEFMT_SPARE_28     (0x0003)
+#define PAGEFMT_SPARE_MASK   (0x0030)
+#define PAGEFMT_SPARE_SHIFT  (4)
+
+#define PAGEFMT_FDM_MASK     (0x0F00)
+#define PAGEFMT_FDM_SHIFT    (8)
+
+#define PAGEFMT_FDM_ECC_MASK  (0xF000)
+#define PAGEFMT_FDM_ECC_SHIFT (12)
+
+/* NFI_CON */
+#define CON_FIFO_FLUSH       (0x0001)
+#define CON_NFI_RST          (0x0002)
+#define CON_NFI_SRD          (0x0010)
+
+#define CON_NFI_NOB_MASK     (0x0060)
+#define CON_NFI_NOB_SHIFT    (5)
+
+#define CON_NFI_BRD          (0x0100)
+#define CON_NFI_BWR          (0x0200)
+
+#define CON_NFI_SEC_MASK     (0xF000)
+#define CON_NFI_SEC_SHIFT    (12)
+
+/* NFI_ACCCON */
+#define ACCCON_SETTING       ()
+
+/* NFI_INTR_EN */
+#define INTR_RD_DONE_EN      (0x0001)
+#define INTR_WR_DONE_EN      (0x0002)
+#define INTR_RST_DONE_EN     (0x0004)
+#define INTR_ERASE_DONE_EN   (0x0008)
+#define INTR_BSY_RTN_EN      (0x0010)
+#define INTR_ACC_LOCK_EN     (0x0020)
+#define INTR_AHB_DONE_EN     (0x0040)
+#define INTR_ALL_INTR_DE     (0x0000)
+#define INTR_ALL_INTR_EN     (0x007F)
+
+/* NFI_INTR */
+#define INTR_RD_DONE         (0x0001)
+#define INTR_WR_DONE         (0x0002)
+#define INTR_RST_DONE        (0x0004)
+#define INTR_ERASE_DONE      (0x0008)
+#define INTR_BSY_RTN         (0x0010)
+#define INTR_ACC_LOCK        (0x0020)
+#define INTR_AHB_DONE        (0x0040)
+
+/* NFI_ADDRNOB */
+#define ADDR_COL_NOB_MASK    (0x0003)
+#define ADDR_COL_NOB_SHIFT   (0)
+#define ADDR_ROW_NOB_MASK    (0x0030)
+#define ADDR_ROW_NOB_SHIFT   (4)
+
+/* NFI_STA */
+#define STA_READ_EMPTY       (0x00001000)
+#define STA_ACC_LOCK         (0x00000010)
+#define STA_CMD_STATE        (0x00000001)
+#define STA_ADDR_STATE       (0x00000002)
+#define STA_DATAR_STATE      (0x00000004)
+#define STA_DATAW_STATE      (0x00000008)
+
+#define STA_NAND_FSM_MASK    (0x1F000000)
+#define STA_NAND_BUSY        (0x00000100)
+#define STA_NAND_BUSY_RETURN (0x00000200)
+#define STA_NFI_FSM_MASK     (0x000F0000)
+#define STA_NFI_OP_MASK      (0x0000000F)
+
+/* NFI_FIFOSTA */
+#define FIFO_RD_EMPTY        (0x0040)
+#define FIFO_RD_FULL         (0x0080)
+#define FIFO_WR_FULL         (0x8000)
+#define FIFO_WR_EMPTY        (0x4000)
+#define FIFO_RD_REMAIN(x)    (0x1F&(x))
+#define FIFO_WR_REMAIN(x)    ((0x1F00&(x))>>8)
+
+/* NFI_ADDRCNTR */
+#define ADDRCNTR_CNTR(x)     ((0xF000&(x))>>12)
+#define ADDRCNTR_OFFSET(x)   (0x03FF&(x))
+
+/* NFI_LOCK */
+#define NFI_LOCK_ON          (0x0001)
+
+/* NFI_LOCKANOB */
+#define PROG_RADD_NOB_MASK   (0x7000)
+#define PROG_RADD_NOB_SHIFT  (12)
+#define PROG_CADD_NOB_MASK   (0x0300)
+#define PROG_CADD_NOB_SHIFT  (8)
+#define ERASE_RADD_NOB_MASK   (0x0070)
+#define ERASE_RADD_NOB_SHIFT  (4)
+#define ERASE_CADD_NOB_MASK   (0x0007)
+#define ERASE_CADD_NOB_SHIFT  (0)
+
+/*******************************************************************************
+ * ECC Register Definition 
+ *******************************************************************************/
+
+#define ECC_ENCCON_REG16	((volatile P_U16)(NFIECC_BASE+0x0000))
+#define ECC_ENCCNFG_REG32  	((volatile P_U32)(NFIECC_BASE+0x0004))
+#define ECC_ENCDIADDR_REG32	((volatile P_U32)(NFIECC_BASE+0x0008))
+#define ECC_ENCIDLE_REG32  	((volatile P_U32)(NFIECC_BASE+0x000C))
+#define ECC_ENCPAR0_REG32   ((volatile P_U32)(NFIECC_BASE+0x0010))
+#define ECC_ENCPAR1_REG32   ((volatile P_U32)(NFIECC_BASE+0x0014))
+#define ECC_ENCPAR2_REG32   ((volatile P_U32)(NFIECC_BASE+0x0018))
+#define ECC_ENCPAR3_REG32   ((volatile P_U32)(NFIECC_BASE+0x001C))
+#define ECC_ENCPAR4_REG32   ((volatile P_U32)(NFIECC_BASE+0x0020))
+#define ECC_ENCSTA_REG32    ((volatile P_U32)(NFIECC_BASE+0x0024))
+#define ECC_ENCIRQEN_REG16  ((volatile P_U16)(NFIECC_BASE+0x0028))
+#define ECC_ENCIRQSTA_REG16 ((volatile P_U16)(NFIECC_BASE+0x002C))
+
+#define ECC_DECCON_REG16    ((volatile P_U16)(NFIECC_BASE+0x0100))
+#define ECC_DECCNFG_REG32   ((volatile P_U32)(NFIECC_BASE+0x0104))
+#define ECC_DECDIADDR_REG32 ((volatile P_U32)(NFIECC_BASE+0x0108))
+#define ECC_DECIDLE_REG16   ((volatile P_U16)(NFIECC_BASE+0x010C))
+#define ECC_DECFER_REG16    ((volatile P_U16)(NFIECC_BASE+0x0110))
+#define ECC_DECENUM_REG32   ((volatile P_U32)(NFIECC_BASE+0x0114))
+#define ECC_DECDONE_REG16   ((volatile P_U16)(NFIECC_BASE+0x0118))
+#define ECC_DECEL0_REG32    ((volatile P_U32)(NFIECC_BASE+0x011C))
+#define ECC_DECEL1_REG32    ((volatile P_U32)(NFIECC_BASE+0x0120))
+#define ECC_DECEL2_REG32    ((volatile P_U32)(NFIECC_BASE+0x0124))
+#define ECC_DECEL3_REG32    ((volatile P_U32)(NFIECC_BASE+0x0128))
+#define ECC_DECEL4_REG32    ((volatile P_U32)(NFIECC_BASE+0x012C))
+#define ECC_DECEL5_REG32    ((volatile P_U32)(NFIECC_BASE+0x0130))
+#define ECC_DECIRQEN_REG16  ((volatile P_U16)(NFIECC_BASE+0x0134))
+#define ECC_DECIRQSTA_REG16 ((volatile P_U16)(NFIECC_BASE+0x0138))
+#define ECC_FDMADDR_REG32   ((volatile P_U32)(NFIECC_BASE+0x013C))
+#define ECC_DECFSM_REG32    ((volatile P_U32)(NFIECC_BASE+0x0140))
+#define ECC_SYNSTA_REG32    ((volatile P_U32)(NFIECC_BASE+0x0144))
+#define ECC_DECNFIDI_REG32  ((volatile P_U32)(NFIECC_BASE+0x0148))
+#define ECC_SYN0_REG32      ((volatile P_U32)(NFIECC_BASE+0x014C))
+
+/*******************************************************************************
+ * ECC register definition
+ *******************************************************************************/
+/* ECC_ENCON */
+#define ENC_EN             		(0x0001)
+#define ENC_DE                 	(0x0000)
+
+/* ECC_ENCCNFG */
+#define ECC_CNFG_ECC4          	(0x0000)
+#define ECC_CNFG_ECC6          	(0x0001)
+#define ECC_CNFG_ECC8          	(0x0002)
+#define ECC_CNFG_ECC10         	(0x0003)
+#define ECC_CNFG_ECC12         	(0x0004)
+#define ECC_CNFG_ECC_MASK      	(0x00000007)
+
+#define ENC_CNFG_NFI           	(0x0010)
+#define ENC_CNFG_MODE_MASK     	(0x0010)
+
+#define ENC_CNFG_META6         	(0x10300000)
+#define ENC_CNFG_META8         	(0x10400000)
+
+#define ENC_CNFG_MSG_MASK  		(0x1FFF0000)
+#define ENC_CNFG_MSG_SHIFT 		(0x10)
+
+/* ECC_ENCIDLE */
+#define ENC_IDLE           		(0x0001)
+
+/* ECC_ENCSTA */
+#define STA_FSM            		(0x001F)
+#define STA_COUNT_PS       		(0xFF10)
+#define STA_COUNT_MS       		(0x3FFF0000)
+
+/* ECC_ENCIRQEN */
+#define ENC_IRQEN          		(0x0001)
+
+/* ECC_ENCIRQSTA */
+#define ENC_IRQSTA         		(0x0001)
+
+/* ECC_DECCON */
+#define DEC_EN             		(0x0001)
+#define DEC_DE             		(0x0000)
+
+/* ECC_ENCCNFG */
+#define DEC_CNFG_ECC4          (0x0000)
+//#define DEC_CNFG_ECC6          (0x0001)
+//#define DEC_CNFG_ECC12         (0x0002)
+#define DEC_CNFG_NFI           (0x0010)
+//#define DEC_CNFG_META6         (0x10300000)
+//#define DEC_CNFG_META8         (0x10400000)
+
+#define DEC_CNFG_FER           (0x01000)
+#define DEC_CNFG_EL            (0x02000)
+#define DEC_CNFG_CORRECT       (0x03000)
+#define DEC_CNFG_TYPE_MASK     (0x03000)
+
+#define DEC_CNFG_EMPTY_EN      (0x80000000)
+
+#define DEC_CNFG_CODE_MASK     (0x1FFF0000)
+#define DEC_CNFG_CODE_SHIFT    (0x10)
+
+/* ECC_DECIDLE */
+#define DEC_IDLE           		(0x0001)
+
+/* ECC_DECFER */
+#define DEC_FER0               (0x0001)
+#define DEC_FER1               (0x0002)
+#define DEC_FER2               (0x0004)
+#define DEC_FER3               (0x0008)
+#define DEC_FER4               (0x0010)
+#define DEC_FER5               (0x0020)
+#define DEC_FER6               (0x0040)
+#define DEC_FER7               (0x0080)
+
+/* ECC_DECENUM */
+#define ERR_NUM0               (0x0000000F)
+#define ERR_NUM1               (0x000000F0)
+#define ERR_NUM2               (0x00000F00)
+#define ERR_NUM3               (0x0000F000)
+#define ERR_NUM4               (0x000F0000)
+#define ERR_NUM5               (0x00F00000)
+#define ERR_NUM6               (0x0F000000)
+#define ERR_NUM7               (0xF0000000)
+
+/* ECC_DECDONE */
+#define DEC_DONE0               (0x0001)
+#define DEC_DONE1               (0x0002)
+#define DEC_DONE2               (0x0004)
+#define DEC_DONE3               (0x0008)
+#define DEC_DONE4               (0x0010)
+#define DEC_DONE5               (0x0020)
+#define DEC_DONE6               (0x0040)
+#define DEC_DONE7               (0x0080)
+
+/* ECC_DECIRQEN */
+#define DEC_IRQEN         		(0x0001)
+
+/* ECC_DECIRQSTA */
+#define DEC_IRQSTA      		(0x0001)
+
+#define CHIPVER_ECO_1           (0x8a00)
+#define CHIPVER_ECO_2           (0x8a01)
+
+//#define NAND_PFM
+
+/*******************************************************************************
+ * Data Structure Definition
+ *******************************************************************************/
+struct mtk_nand_host 
+{
+	struct nand_chip		nand_chip;
+	struct mtd_info			mtd;
+	struct mtk_nand_host_hw	*hw;
+};
+
+struct NAND_CMD
+{
+	u32	u4ColAddr;
+	u32 u4RowAddr;
+	u32 u4OOBRowAddr;
+	u8	au1OOB[288];
+	u8*	pDataBuf;
+#ifdef NAND_PFM	
+	u32 pureReadOOB;
+	u32 pureReadOOBNum;
+#endif
+};
+
+/*
+ *	ECC layout control structure. Exported to userspace for
+ *  diagnosis and to allow creation of raw images
+struct nand_ecclayout {
+	uint32_t eccbytes;
+	uint32_t eccpos[64];
+	uint32_t oobavail;
+	struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES];
+};
+*/
+#define __DEBUG_NAND		1			/* Debug information on/off */
+
+/* Debug message event */
+#define DBG_EVT_NONE		0x00000000	/* No event */
+#define DBG_EVT_INIT		0x00000001	/* Initial related event */
+#define DBG_EVT_VERIFY		0x00000002	/* Verify buffer related event */
+#define DBG_EVT_PERFORMANCE	0x00000004	/* Performance related event */
+#define DBG_EVT_READ		0x00000008	/* Read related event */
+#define DBG_EVT_WRITE		0x00000010	/* Write related event */
+#define DBG_EVT_ERASE		0x00000020	/* Erase related event */
+#define DBG_EVT_BADBLOCK	0x00000040	/* Badblock related event */
+#define DBG_EVT_POWERCTL	0x00000080	/* Suspend/Resume related event */
+
+#define DBG_EVT_ALL			0xffffffff
+
+#define DBG_EVT_MASK      	(DBG_EVT_INIT)
+
+#if __DEBUG_NAND
+#define MSG(evt, fmt, args...) \
+do {	\
+	if ((DBG_EVT_##evt) & DBG_EVT_MASK) { \
+		printk(fmt, ##args); \
+	} \
+} while(0)
+
+#define MSG_FUNC_ENTRY(f)	MSG(FUC, "<FUN_ENT>: %s\n", __FUNCTION__)
+#else
+#define MSG(evt, fmt, args...) do{}while(0)
+#define MSG_FUNC_ENTRY(f)	   do{}while(0)
+#endif
+
+#define RAMDOM_READ 1<<0
+#define CACHE_READ  1<<1
+
+typedef struct
+{
+   u16 id;          //deviceid+menuid
+   u32 ext_id; 
+   u8  addr_cycle;
+   u8  iowidth;
+   u16 totalsize;   
+   u16 blocksize;
+   u16 pagesize;
+   u16 sparesize;
+   u32 timmingsetting;
+   char devciename[14];
+   u32 advancedmode;   //
+}flashdev_info,*pflashdev_info;
+
+/* NAND driver */
+#if 0
+struct mtk_nand_host_hw {
+    unsigned int nfi_bus_width;		    /* NFI_BUS_WIDTH */ 
+	unsigned int nfi_access_timing;		/* NFI_ACCESS_TIMING */  
+	unsigned int nfi_cs_num;			/* NFI_CS_NUM */
+	unsigned int nand_sec_size;			/* NAND_SECTOR_SIZE */
+	unsigned int nand_sec_shift;		/* NAND_SECTOR_SHIFT */
+	unsigned int nand_ecc_size;
+	unsigned int nand_ecc_bytes;
+	unsigned int nand_ecc_mode;
+};
+extern struct mtk_nand_host_hw mt7621_nand_hw;
+extern u32	CFG_BLOCKSIZE;
+#endif
+#endif
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -92,7 +92,7 @@ static struct nand_ecclayout nand_oob_12
 		 .length = 78} }
 };
 
-static int nand_get_device(struct mtd_info *mtd, int new_state);
+int nand_get_device(struct mtd_info *mtd, int new_state);
 
 static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
 			     struct mtd_oob_ops *ops);
@@ -130,7 +130,7 @@ static int check_offs_len(struct mtd_inf
  *
  * Release chip lock and wake up anyone waiting on the device.
  */
-static void nand_release_device(struct mtd_info *mtd)
+void nand_release_device(struct mtd_info *mtd)
 {
 	struct nand_chip *chip = mtd->priv;
 
@@ -829,7 +829,7 @@ static void panic_nand_get_device(struct
  *
  * Get the device and lock it for exclusive access
  */
-static int
+int
 nand_get_device(struct mtd_info *mtd, int new_state)
 {
 	struct nand_chip *chip = mtd->priv;
--- a/drivers/mtd/nand/nand_bbt.c
+++ b/drivers/mtd/nand/nand_bbt.c
@@ -1374,4 +1374,23 @@ int nand_markbad_bbt(struct mtd_info *mt
 	return ret;
 }
 
+void nand_bbt_set(struct mtd_info *mtd, int page, int flag)
+{
+	struct nand_chip *this = mtd->priv;
+	int block;
+
+	block = (int)(page >> (this->bbt_erase_shift - this->page_shift - 1));
+	this->bbt[block >> 3] &= ~(0x03 << (block & 0x6));
+	this->bbt[block >> 3] |= (flag & 0x3) << (block & 0x6);
+}
+
+int nand_bbt_get(struct mtd_info *mtd, int page)
+{
+	struct nand_chip *this = mtd->priv;
+	int block;
+
+	block = (int)(page >> (this->bbt_erase_shift - this->page_shift - 1));
+	return (this->bbt[block >> 3] >> (block & 0x06)) & 0x03;
+}
+
 EXPORT_SYMBOL(nand_scan_bbt);
--- /dev/null
+++ b/drivers/mtd/nand/nand_def.h
@@ -0,0 +1,123 @@
+#ifndef __NAND_DEF_H__
+#define __NAND_DEF_H__
+
+#define VERSION  	"v2.1 Fix AHB virt2phys error"
+#define MODULE_NAME	"# MTK NAND #"
+#define PROCNAME    "driver/nand"
+
+#undef TESTTIME
+//#define __UBOOT_NAND__			1
+#define __KERNEL_NAND__		1
+//#define __PRELOADER_NAND__	1
+//#define PMT 1
+//#define _MTK_NAND_DUMMY_DRIVER
+//#define CONFIG_BADBLOCK_CHECK	1
+//#ifdef CONFIG_BADBLOCK_CHECK
+//#define MTK_NAND_BMT	1
+//#endif
+#define ECC_ENABLE		1
+#define MANUAL_CORRECT	1
+//#define __INTERNAL_USE_AHB_MODE__ 	(0)
+#define SKIP_BAD_BLOCK
+#define FACT_BBT
+
+#ifndef NAND_OTP_SUPPORT
+#define NAND_OTP_SUPPORT 0
+#endif
+
+/*******************************************************************************
+ * Macro definition 
+ *******************************************************************************/
+//#define NFI_SET_REG32(reg, value)   (DRV_WriteReg32(reg, DRV_Reg32(reg) | (value))) 
+//#define NFI_SET_REG16(reg, value)   (DRV_WriteReg16(reg, DRV_Reg16(reg) | (value)))
+//#define NFI_CLN_REG32(reg, value)   (DRV_WriteReg32(reg, DRV_Reg32(reg) & (~(value))))
+//#define NFI_CLN_REG16(reg, value)   (DRV_WriteReg16(reg, DRV_Reg16(reg) & (~(value))))
+
+#if defined (__KERNEL_NAND__)
+#define NFI_SET_REG32(reg, value) \
+do {	\
+	g_value = (DRV_Reg32(reg) | (value));\
+	DRV_WriteReg32(reg, g_value); \
+} while(0)
+
+#define NFI_SET_REG16(reg, value) \
+do {	\
+	g_value = (DRV_Reg16(reg) | (value));\
+	DRV_WriteReg16(reg, g_value); \
+} while(0)
+
+#define NFI_CLN_REG32(reg, value) \
+do {	\
+	g_value = (DRV_Reg32(reg) & (~(value)));\
+	DRV_WriteReg32(reg, g_value); \
+} while(0)
+
+#define NFI_CLN_REG16(reg, value) \
+do {	\
+	g_value = (DRV_Reg16(reg) & (~(value)));\
+	DRV_WriteReg16(reg, g_value); \
+} while(0)
+#endif
+
+#define NFI_WAIT_STATE_DONE(state) do{;}while (__raw_readl(NFI_STA_REG32) & state)
+#define NFI_WAIT_TO_READY()  do{;}while (!(__raw_readl(NFI_STA_REG32) & STA_BUSY2READY))
+
+
+#define NAND_SECTOR_SIZE (512)
+#define OOB_PER_SECTOR      (16)
+#define OOB_AVAI_PER_SECTOR (8)
+
+#ifndef PART_SIZE_BMTPOOL
+#define BMT_POOL_SIZE       (80)
+#else
+#define BMT_POOL_SIZE (PART_SIZE_BMTPOOL)
+#endif
+
+#define PMT_POOL_SIZE	(2)
+
+#define TIMEOUT_1   0x1fff
+#define TIMEOUT_2   0x8ff
+#define TIMEOUT_3   0xffff
+#define TIMEOUT_4   0xffff//5000   //PIO
+
+
+/* temporarity definiation */
+#if !defined (__KERNEL_NAND__) 
+#define KERN_INFO
+#define KERN_WARNING
+#define KERN_ERR
+#define PAGE_SIZE	(4096)
+#endif
+#define AddStorageTrace				//AddStorageTrace
+#define STORAGE_LOGGER_MSG_NAND		0
+#define NFI_BASE 					RALINK_NAND_CTRL_BASE
+#define NFIECC_BASE 				RALINK_NANDECC_CTRL_BASE
+
+#ifdef __INTERNAL_USE_AHB_MODE__
+#define MT65xx_POLARITY_LOW   0
+#define MT65XX_PDN_PERI_NFI   0
+#define MT65xx_EDGE_SENSITIVE 0
+#define MT6575_NFI_IRQ_ID                    (58)
+#endif
+
+#if defined (__KERNEL_NAND__)
+#define RALINK_REG(x)		(*((volatile u32 *)(x)))	
+#define __virt_to_phys(x)	virt_to_phys((volatile void*)x)
+#else
+#define CONFIG_MTD_NAND_VERIFY_WRITE	(1)
+#define printk	printf
+#define ra_dbg printf
+#define BUG()							//BUG()
+#define BUG_ON(x)						//BUG_ON()
+#define NUM_PARTITIONS 				1
+#endif
+
+#define NFI_DEFAULT_ACCESS_TIMING        (0x30C77fff)	//(0x44333)
+
+//uboot only support 1 cs
+#define NFI_CS_NUM                  (1)
+#define NFI_DEFAULT_CS              (0)
+
+#include "mt6575_typedefs.h"
+
+#endif /* __NAND_DEF_H__ */
--- /dev/null
+++ b/drivers/mtd/nand/nand_device_list.h
@@ -0,0 +1,55 @@
+/* Copyright Statement:
+ *
+ * This software/firmware and related documentation ("MediaTek Software") are
+ * protected under relevant copyright laws. The information contained herein
+ * is confidential and proprietary to MediaTek Inc. and/or its licensors.
+ * Without the prior written permission of MediaTek inc. and/or its licensors,
+ * any reproduction, modification, use or disclosure of MediaTek Software,
+ * and information contained herein, in whole or in part, shall be strictly prohibited.
+ */
+/* MediaTek Inc. (C) 2010. All rights reserved.
+ *
+ * BY OPENING THIS FILE, RECEIVER HEREBY UNEQUIVOCALLY ACKNOWLEDGES AND AGREES
+ * THAT THE SOFTWARE/FIRMWARE AND ITS DOCUMENTATIONS ("MEDIATEK SOFTWARE")
+ * RECEIVED FROM MEDIATEK AND/OR ITS REPRESENTATIVES ARE PROVIDED TO RECEIVER ON
+ * AN "AS-IS" BASIS ONLY. MEDIATEK EXPRESSLY DISCLAIMS ANY AND ALL WARRANTIES,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT.
+ * NEITHER DOES MEDIATEK PROVIDE ANY WARRANTY WHATSOEVER WITH RESPECT TO THE
+ * SOFTWARE OF ANY THIRD PARTY WHICH MAY BE USED BY, INCORPORATED IN, OR
+ * SUPPLIED WITH THE MEDIATEK SOFTWARE, AND RECEIVER AGREES TO LOOK ONLY TO SUCH
+ * THIRD PARTY FOR ANY WARRANTY CLAIM RELATING THERETO. RECEIVER EXPRESSLY ACKNOWLEDGES
+ * THAT IT IS RECEIVER'S SOLE RESPONSIBILITY TO OBTAIN FROM ANY THIRD PARTY ALL PROPER LICENSES
+ * CONTAINED IN MEDIATEK SOFTWARE. MEDIATEK SHALL ALSO NOT BE RESPONSIBLE FOR ANY MEDIATEK
+ * SOFTWARE RELEASES MADE TO RECEIVER'S SPECIFICATION OR TO CONFORM TO A PARTICULAR
+ * STANDARD OR OPEN FORUM. RECEIVER'S SOLE AND EXCLUSIVE REMEDY AND MEDIATEK'S ENTIRE AND
+ * CUMULATIVE LIABILITY WITH RESPECT TO THE MEDIATEK SOFTWARE RELEASED HEREUNDER WILL BE,
+ * AT MEDIATEK'S OPTION, TO REVISE OR REPLACE THE MEDIATEK SOFTWARE AT ISSUE,
+ * OR REFUND ANY SOFTWARE LICENSE FEES OR SERVICE CHARGE PAID BY RECEIVER TO
+ * MEDIATEK FOR SUCH MEDIATEK SOFTWARE AT ISSUE.
+ *
+ * The following software/firmware and/or related documentation ("MediaTek Software")
+ * have been modified by MediaTek Inc. All revisions are subject to any receiver's
+ * applicable license agreements with MediaTek Inc.
+ */
+
+#ifndef __NAND_DEVICE_LIST_H__
+#define __NAND_DEVICE_LIST_H__
+
+static const flashdev_info gen_FlashTable[]={
+	{0x20BC, 0x105554, 5, 16, 512, 128, 2048, 64, 0x1123, "EHD013151MA_5", 0},
+	{0xECBC, 0x005554, 5, 16, 512, 128, 2048, 64, 0x1123, "K524G2GACB_A0", 0},
+	{0x2CBC, 0x905556, 5, 16, 512, 128, 2048, 64, 0x21044333, "MT29C4G96MAZA", 0},
+	{0xADBC, 0x905554, 5, 16, 512, 128, 2048, 64, 0x10801011, "H9DA4GH4JJAMC", 0},
+    {0x01F1, 0x801D01, 4, 8, 128, 128, 2048, 64, 0x30C77fff, "S34ML01G100TF", 0},
+    {0x92F1, 0x8095FF, 4, 8, 128, 128, 2048, 64, 0x30C77fff, "F59L1G81A", 0},
+	{0xECD3, 0x519558, 5, 8, 1024, 128, 2048, 64, 0x44333, "K9K8G8000", 0},
+    {0xC2F1, 0x801DC2, 4, 8, 128, 128, 2048, 64, 0x30C77fff, "MX30LF1G08AA", 0},
+    {0x98D3, 0x902676, 5, 8, 1024, 256, 4096, 224, 0x00C25332, "TC58NVG3S0F", 0},
+    {0x01DA, 0x909546, 5, 8, 256, 128, 2048, 128, 0x30C77fff, "S34ML02G200TF", 0},
+    {0x01DC, 0x909556, 5, 8, 512, 128, 2048, 128, 0x30C77fff, "S34ML04G200TF", 0},
+	{0x0000, 0x000000, 0, 0, 0, 0, 0, 0, 0, "xxxxxxxxxx", 0},
+};
+
+
+#endif
--- /dev/null
+++ b/drivers/mtd/nand/partition.h
@@ -0,0 +1,115 @@
+/* Copyright Statement:
+ *
+ * This software/firmware and related documentation ("MediaTek Software") are
+ * protected under relevant copyright laws. The information contained herein
+ * is confidential and proprietary to MediaTek Inc. and/or its licensors.
+ * Without the prior written permission of MediaTek inc. and/or its licensors,
+ * any reproduction, modification, use or disclosure of MediaTek Software,
+ * and information contained herein, in whole or in part, shall be strictly prohibited.
+ */
+/* MediaTek Inc. (C) 2010. All rights reserved.
+ *
+ * BY OPENING THIS FILE, RECEIVER HEREBY UNEQUIVOCALLY ACKNOWLEDGES AND AGREES
+ * THAT THE SOFTWARE/FIRMWARE AND ITS DOCUMENTATIONS ("MEDIATEK SOFTWARE")
+ * RECEIVED FROM MEDIATEK AND/OR ITS REPRESENTATIVES ARE PROVIDED TO RECEIVER ON
+ * AN "AS-IS" BASIS ONLY. MEDIATEK EXPRESSLY DISCLAIMS ANY AND ALL WARRANTIES,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT.
+ * NEITHER DOES MEDIATEK PROVIDE ANY WARRANTY WHATSOEVER WITH RESPECT TO THE
+ * SOFTWARE OF ANY THIRD PARTY WHICH MAY BE USED BY, INCORPORATED IN, OR
+ * SUPPLIED WITH THE MEDIATEK SOFTWARE, AND RECEIVER AGREES TO LOOK ONLY TO SUCH
+ * THIRD PARTY FOR ANY WARRANTY CLAIM RELATING THERETO. RECEIVER EXPRESSLY ACKNOWLEDGES
+ * THAT IT IS RECEIVER'S SOLE RESPONSIBILITY TO OBTAIN FROM ANY THIRD PARTY ALL PROPER LICENSES
+ * CONTAINED IN MEDIATEK SOFTWARE. MEDIATEK SHALL ALSO NOT BE RESPONSIBLE FOR ANY MEDIATEK
+ * SOFTWARE RELEASES MADE TO RECEIVER'S SPECIFICATION OR TO CONFORM TO A PARTICULAR
+ * STANDARD OR OPEN FORUM. RECEIVER'S SOLE AND EXCLUSIVE REMEDY AND MEDIATEK'S ENTIRE AND
+ * CUMULATIVE LIABILITY WITH RESPECT TO THE MEDIATEK SOFTWARE RELEASED HEREUNDER WILL BE,
+ * AT MEDIATEK'S OPTION, TO REVISE OR REPLACE THE MEDIATEK SOFTWARE AT ISSUE,
+ * OR REFUND ANY SOFTWARE LICENSE FEES OR SERVICE CHARGE PAID BY RECEIVER TO
+ * MEDIATEK FOR SUCH MEDIATEK SOFTWARE AT ISSUE.
+ *
+ * The following software/firmware and/or related documentation ("MediaTek Software")
+ * have been modified by MediaTek Inc. All revisions are subject to any receiver's
+ * applicable license agreements with MediaTek Inc.
+ */
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/partitions.h>
+
+#define RECONFIG_PARTITION_SIZE 1
+
+#define MTD_BOOT_PART_SIZE  0x80000
+#define MTD_CONFIG_PART_SIZE    0x20000
+#define MTD_FACTORY_PART_SIZE   0x20000
+
+extern unsigned int  CFG_BLOCKSIZE;
+#define LARGE_MTD_BOOT_PART_SIZE       (CFG_BLOCKSIZE<<2)
+#define LARGE_MTD_CONFIG_PART_SIZE     (CFG_BLOCKSIZE<<2)
+#define LARGE_MTD_FACTORY_PART_SIZE    (CFG_BLOCKSIZE<<1)
+
+/*=======================================================================*/
+/* NAND PARTITION Mapping                                                  */
+/*=======================================================================*/
+//#ifdef CONFIG_MTD_PARTITIONS
+static struct mtd_partition g_pasStatic_Partition[] = {
+	{
+                name:           "ALL",
+                size:           MTDPART_SIZ_FULL,
+                offset:         0,
+        },
+        /* Put your own partition definitions here */
+        {
+                name:           "Bootloader",
+                size:           MTD_BOOT_PART_SIZE,
+                offset:         0,
+        }, {
+                name:           "Config",
+                size:           MTD_CONFIG_PART_SIZE,
+                offset:         MTDPART_OFS_APPEND
+        }, {
+                name:           "Factory",
+                size:           MTD_FACTORY_PART_SIZE,
+                offset:         MTDPART_OFS_APPEND
+#ifdef CONFIG_RT2880_ROOTFS_IN_FLASH
+        }, {
+                name:           "Kernel",
+                size:           MTD_KERN_PART_SIZE,
+                offset:         MTDPART_OFS_APPEND,
+        }, {
+                name:           "RootFS",
+                size:           MTD_ROOTFS_PART_SIZE,
+                offset:         MTDPART_OFS_APPEND,
+#ifdef CONFIG_ROOTFS_IN_FLASH_NO_PADDING
+        }, {
+                name:           "Kernel_RootFS",
+                size:           MTD_KERN_PART_SIZE + MTD_ROOTFS_PART_SIZE,
+                offset:         MTD_BOOT_PART_SIZE + MTD_CONFIG_PART_SIZE + MTD_FACTORY_PART_SIZE,
+#endif
+#else //CONFIG_RT2880_ROOTFS_IN_RAM
+        }, {
+                name:           "Kernel",
+                size:           0x10000,
+                offset:         MTDPART_OFS_APPEND,
+#endif
+#ifdef CONFIG_DUAL_IMAGE
+        }, {
+                name:           "Kernel2",
+                size:           MTD_KERN2_PART_SIZE,
+                offset:         MTD_KERN2_PART_OFFSET,
+#ifdef CONFIG_RT2880_ROOTFS_IN_FLASH
+        }, {
+                name:           "RootFS2",
+                size:           MTD_ROOTFS2_PART_SIZE,
+                offset:         MTD_ROOTFS2_PART_OFFSET,
+#endif
+#endif
+        }
+
+};
+
+#define NUM_PARTITIONS ARRAY_SIZE(g_pasStatic_Partition)
+extern int part_num;	// = NUM_PARTITIONS;
+//#endif
+#undef RECONFIG_PARTITION_SIZE
+