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-rw-r--r--target/linux/ramips/patches-3.9/0208-owrt-mtd-split.patch151
1 files changed, 151 insertions, 0 deletions
diff --git a/target/linux/ramips/patches-3.9/0208-owrt-mtd-split.patch b/target/linux/ramips/patches-3.9/0208-owrt-mtd-split.patch
new file mode 100644
index 0000000..f15d16f
--- /dev/null
+++ b/target/linux/ramips/patches-3.9/0208-owrt-mtd-split.patch
@@ -0,0 +1,151 @@
+From 2a295753a10823a47542c779a25bbb1f52c71281 Mon Sep 17 00:00:00 2001
+From: John Crispin <blogic@openwrt.org>
+Date: Fri, 3 Aug 2012 10:27:13 +0200
+Subject: [PATCH 19/25] owrt mtd split
+
+---
+ .../mips/include/asm/mach-lantiq/xway/lantiq_soc.h | 1 +
+ arch/mips/lantiq/setup.c | 7 +
+ drivers/mtd/Kconfig | 4 +
+ drivers/mtd/mtdpart.c | 173 +++++++++++++++++++-
+ 4 files changed, 184 insertions(+), 1 deletions(-)
+
+--- a/drivers/mtd/Kconfig
++++ b/drivers/mtd/Kconfig
+@@ -31,6 +31,10 @@ config MTD_ROOTFS_SPLIT
+ bool "Automatically split 'rootfs' partition for squashfs"
+ default y
+
++config MTD_UIMAGE_SPLIT
++ bool "Automatically split 'linux' partition into 'kernel' and 'rootfs'"
++ default y
++
+ config MTD_REDBOOT_PARTS
+ tristate "RedBoot partition table parsing"
+ ---help---
+--- a/drivers/mtd/mtdpart.c
++++ b/drivers/mtd/mtdpart.c
+@@ -833,6 +833,99 @@ static int refresh_rootfs_split(struct m
+ }
+ #endif /* CONFIG_MTD_ROOTFS_SPLIT */
+
++#ifdef CONFIG_MTD_UIMAGE_SPLIT
++static unsigned long find_uimage_size(struct mtd_info *mtd,
++ unsigned long offset)
++{
++#define UBOOT_MAGIC 0x56190527
++ unsigned long magic = 0;
++ unsigned long temp;
++ size_t len;
++ int ret;
++
++ ret = mtd_read(mtd, offset, 4, &len, (void *)&magic);
++ if (ret || len != sizeof(magic))
++ return 0;
++
++ if (le32_to_cpu(magic) != UBOOT_MAGIC)
++ return 0;
++
++ ret = mtd_read(mtd, offset + 12, 4, &len, (void *)&temp);
++ if (ret || len != sizeof(temp))
++ return 0;
++
++ return be32_to_cpu(temp) + 0x40;
++}
++
++static int detect_squashfs_partition(struct mtd_info *mtd, unsigned long offset)
++{
++ unsigned long temp;
++ size_t len;
++ int ret;
++
++ ret = mtd_read(mtd, offset, 4, &len, (void *)&temp);
++ if (ret || len != sizeof(temp))
++ return 0;
++
++ return le32_to_cpu(temp) == SQUASHFS_MAGIC;
++}
++
++static unsigned long find_squashfs_offset(struct mtd_info *mtd, unsigned long _offset)
++{
++ /* scan the first 2MB at 64K offsets */
++ int i;
++
++ for (i = 0; i < 32; i++) {
++ unsigned long offset = i * 64 * 1024;
++ if (detect_squashfs_partition(mtd, _offset + offset))
++ return offset;
++ }
++ return 0;
++}
++
++static int split_uimage(struct mtd_info *mtd,
++ const struct mtd_partition *part)
++{
++ static struct mtd_partition split_partitions[] = {
++ {
++ .name = "kernel",
++ .offset = 0x0,
++ .size = 0x0,
++ }, {
++ .name = "rootfs",
++ .offset = 0x0,
++ .size = 0x0,
++ },
++ };
++
++ split_partitions[0].size = find_uimage_size(mtd, part->offset);
++ if (!split_partitions[0].size) {
++ split_partitions[0].size = find_squashfs_offset(mtd, part->offset);
++ if (!split_partitions[0].size) {
++ pr_err("failed to split firmware partition\n");
++ return -1;
++ }
++ }
++
++ if (!detect_squashfs_partition(mtd,
++ part->offset
++ + split_partitions[0].size)) {
++ split_partitions[0].size &= ~(mtd->erasesize - 1);
++ split_partitions[0].size += mtd->erasesize;
++ } else {
++ pr_info("found squashfs behind kernel\n");
++ }
++
++ split_partitions[0].offset = part->offset;
++ split_partitions[1].offset = part->offset + split_partitions[0].size;
++ split_partitions[1].size = part->size - split_partitions[0].size;
++
++ add_mtd_partitions(mtd, split_partitions, 2);
++
++ return 0;
++}
++#endif
++
+ /*
+ * This function, given a master MTD object and a partition table, creates
+ * and registers slave MTD objects which are bound to the master according to
+@@ -849,7 +942,7 @@ int add_mtd_partitions(struct mtd_info *
+ struct mtd_part *slave;
+ uint64_t cur_offset = 0;
+ int i;
+-#ifdef CONFIG_MTD_ROOTFS_SPLIT
++#if defined(CONFIG_MTD_ROOTFS_SPLIT) || defined(CONFIG_MTD_UIMAGE_SPLIT)
+ int ret;
+ #endif
+
+@@ -866,6 +959,14 @@ int add_mtd_partitions(struct mtd_info *
+
+ add_mtd_device(&slave->mtd);
+
++#ifdef CONFIG_MTD_UIMAGE_SPLIT
++ if (!strcmp(parts[i].name, "firmware")) {
++ ret = split_uimage(master, &parts[i]);
++ if (ret)
++ printk(KERN_WARNING "Can't split firmware partition\n");
++ }
++#endif
++
+ if (!strcmp(parts[i].name, "rootfs")) {
+ #ifdef CONFIG_MTD_ROOTFS_ROOT_DEV
+ if (ROOT_DEV == 0) {