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mtd: bcm47xxpart: find NVRAM partitions in middle blocks

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Old devices used to have NVRAM at the very end of flash and they could
be unaligned (starting at some offset in a block).
In new devices NVRAM can be located quite randomly, however it seems to
always start at the beginning of a block. For example Netgear R6250 has
NVRAM located right after the bootloader, before the kernel partition.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Rafał Miłecki 2014-08-18 20:20:27 +02:00 committed by Brian Norris
parent 022a478ce6
commit 024629fdca
1 changed files with 11 additions and 0 deletions
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11
drivers/mtd/bcm47xxpart.c
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@ -199,6 +199,17 @@ static int bcm47xxpart_parse(struct mtd_info *master,
continue; continue;
} }
/*
* New (ARM?) devices may have NVRAM in some middle block. Last
* block will be checked later, so skip it.
*/
if (offset != master->size - blocksize &&
buf[0x000 / 4] == NVRAM_HEADER) {
bcm47xxpart_add_part(&parts[curr_part++], "nvram",
offset, 0);
continue;
}
/* Read middle of the block */ /* Read middle of the block */
if (mtd_read(master, offset + 0x8000, 0x4, if (mtd_read(master, offset + 0x8000, 0x4,
&bytes_read, (uint8_t *)buf) < 0) { &bytes_read, (uint8_t *)buf) < 0) {