mtd: bcm47xxpart: find NVRAM partitions in middle blocks
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 <[email protected]>
Signed-off-by: Brian Norris <[email protected]>
diff --git a/drivers/mtd/bcm47xxpart.c b/drivers/mtd/bcm47xxpart.c
index adfa74c..8057f52 100644
--- a/drivers/mtd/bcm47xxpart.c
+++ b/drivers/mtd/bcm47xxpart.c
@@ -199,6 +199,17 @@
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 */
if (mtd_read(master, offset + 0x8000, 0x4,
&bytes_read, (uint8_t *)buf) < 0) {
