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authorRafał Miłecki <zajec5@gmail.com>2013-12-21 19:39:12 +0100
committerBrian Norris <computersforpeace@gmail.com>2014-01-07 10:07:37 -0800
commitf0501e81fbaa51cfc8c28c60bc3fc7965fde94f4 (patch)
tree7a280e4abc5182561764979c539bd55a706d0494 /drivers/mtd
parent4f8aaf72287578c846ed7ac8c6114aacbf416e45 (diff)
downloadlinux-f0501e81fbaa51cfc8c28c60bc3fc7965fde94f4.tar.bz2
mtd: bcm47xxpart: alternative MAGIC for board_data partition
Some devices (like WNDR3700v3) have board_data without MPFR magic, some extra header or extra NVRAM around 0x100. In such case we have to look for another magic which is BD 0B 0D BD (BD probably stands for Board Data). It's located "far far away", so instead of extending buffer add another mtd_read. Signed-off-by: Rafał Miłecki <zajec5@gmail.com> Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/bcm47xxpart.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/mtd/bcm47xxpart.c b/drivers/mtd/bcm47xxpart.c
index 877c17c7f5d3..de1eb92e42f5 100644
--- a/drivers/mtd/bcm47xxpart.c
+++ b/drivers/mtd/bcm47xxpart.c
@@ -27,6 +27,7 @@
/* Magics */
#define BOARD_DATA_MAGIC 0x5246504D /* MPFR */
+#define BOARD_DATA_MAGIC2 0xBD0D0BBD
#define CFE_MAGIC 0x43464531 /* 1EFC */
#define FACTORY_MAGIC 0x59544346 /* FCTY */
#define POT_MAGIC1 0x54544f50 /* POTT */
@@ -192,6 +193,21 @@ static int bcm47xxpart_parse(struct mtd_info *master,
offset, 0);
continue;
}
+
+ /* Read middle of the block */
+ if (mtd_read(master, offset + 0x8000, 0x4,
+ &bytes_read, (uint8_t *)buf) < 0) {
+ pr_err("mtd_read error while parsing (offset: 0x%X)!\n",
+ offset);
+ continue;
+ }
+
+ /* Some devices (ex. WNDR3700v3) don't have a standard 'MPFR' */
+ if (buf[0x000 / 4] == BOARD_DATA_MAGIC2) {
+ bcm47xxpart_add_part(&parts[curr_part++], "board_data",
+ offset, MTD_WRITEABLE);
+ continue;
+ }
}
/* Look for NVRAM at the end of the last block. */