brcm47xx: add some more partition parser fixes by Rafał Miłecki

SVN-Revision: 35912

1 files changed, 55 insertions, 0 deletions

diff --git a/target/linux/brcm47xx/patches-3.8/025-mtd-bcm47xxpart-look-for-NVRAM-at-the-end-of-device.patch b/target/linux/brcm47xx/patches-3.8/025-mtd-bcm47xxpart-look-for-NVRAM-at-the-end-of-device.patch
new file mode 100644
index 0000000..1f82c92
--- /dev/null
+++ b/target/linux/brcm47xx/patches-3.8/025-mtd-bcm47xxpart-look-for-NVRAM-at-the-end-of-device.patch
@@ -0,0 +1,55 @@
+--- a/drivers/mtd/bcm47xxpart.c
++++ b/drivers/mtd/bcm47xxpart.c
+@@ -63,6 +63,7 @@ static int bcm47xxpart_parse(struct mtd_
+ 	struct trx_header *trx;
+ 	int trx_part = -1;
+ 	int last_trx_part = -1;
++	int possible_nvram_sizes[] = { 0x8000, 0xF000, 0x10000, };
+ 
+ 	if (blocksize <= 0x10000)
+ 		blocksize = 0x10000;
+@@ -99,13 +100,6 @@ static int bcm47xxpart_parse(struct mtd_
+ 			continue;
+ 		}
+ 
+-		/* Standard NVRAM */
+-		if (buf[0x000 / 4] == NVRAM_HEADER) {
+-			bcm47xxpart_add_part(&parts[curr_part++], "nvram",
+-					     offset, 0);
+-			continue;
+-		}
+-
+ 		/*
+ 		 * board_data starts with board_id which differs across boards,
+ 		 * but we can use 'MPFR' (hopefully) magic at 0x100
+@@ -174,6 +168,30 @@ static int bcm47xxpart_parse(struct mtd_
+ 			continue;
+ 		}
+ 	}
++
++	/* Look for NVRAM at the end of the last block. */
++	for (i = 0; i < ARRAY_SIZE(possible_nvram_sizes); i++) {
++		if (curr_part > BCM47XXPART_MAX_PARTS) {
++			pr_warn("Reached maximum number of partitions, scanning stopped!\n");
++			break;
++		}
++
++		offset = master->size - possible_nvram_sizes[i];
++		if (mtd_read(master, offset, 0x4, &bytes_read,
++			     (uint8_t *)buf) < 0) {
++			pr_err("mtd_read error while reading at offset 0x%X!\n",
++			       offset);
++			continue;
++		}
++
++		/* Standard NVRAM */
++		if (buf[0] == NVRAM_HEADER) {
++			bcm47xxpart_add_part(&parts[curr_part++], "nvram",
++					     master->size - blocksize, 0);
++			break;
++		}
++	}
++
+ 	kfree(buf);
+ 
+ 	/*