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authorRafał Miłecki <zajec5@gmail.com>2013-03-07 09:02:39 +0100
committerDavid Woodhouse <David.Woodhouse@intel.com>2013-03-08 11:36:00 +0000
commit91d542f4dcc231749c36114ed8e26bb27d4521e4 (patch)
tree53996b08552bef0f7e78df30f856066e07708ea9 /drivers/mtd/bcm47xxpart.c
parent5ca1088f10d6179a610067ebedc56edc7d98b986 (diff)
mtd: bcm47xxpart: look for NVRAM at the end of device
NVRAM is always placed at the end of device and it does not have to start at the beginning of a block, so check few possible offsets. Signed-off-by: Rafał Miłecki <zajec5@gmail.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/mtd/bcm47xxpart.c')
-rw-r--r--drivers/mtd/bcm47xxpart.c32
1 files changed, 25 insertions, 7 deletions
diff --git a/drivers/mtd/bcm47xxpart.c b/drivers/mtd/bcm47xxpart.c
index 4552afbad4d0..9279a9174f84 100644
--- a/drivers/mtd/bcm47xxpart.c
+++ b/drivers/mtd/bcm47xxpart.c
@@ -63,6 +63,7 @@ static int bcm47xxpart_parse(struct mtd_info *master,
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_info *master,
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_info *master,
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);
/*