62 lines
1.9 KiB
Diff
62 lines
1.9 KiB
Diff
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--- a/drivers/mtd/bcm47xxpart.c
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+++ b/drivers/mtd/bcm47xxpart.c
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@@ -19,6 +19,12 @@
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/* 10 parts were found on sflash on Netgear WNDR4500 */
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#define BCM47XXPART_MAX_PARTS 12
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+/*
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+ * Amount of bytes we read when analyzing each block of flash memory.
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+ * Set it big enough to allow detecting partition and reading important data.
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+ */
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+#define BCM47XXPART_BYTES_TO_READ 0x404
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+
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/* Magics */
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#define BOARD_DATA_MAGIC 0x5246504D /* MPFR */
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#define POT_MAGIC1 0x54544f50 /* POTT */
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@@ -57,17 +63,14 @@ static int bcm47xxpart_parse(struct mtd_
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struct trx_header *trx;
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int trx_part = -1;
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int last_trx_part = -1;
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- int max_bytes_to_read = 0x8004;
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if (blocksize <= 0x10000)
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blocksize = 0x10000;
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- if (blocksize == 0x20000)
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- max_bytes_to_read = 0x18004;
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/* Alloc */
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parts = kzalloc(sizeof(struct mtd_partition) * BCM47XXPART_MAX_PARTS,
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GFP_KERNEL);
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- buf = kzalloc(max_bytes_to_read, GFP_KERNEL);
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+ buf = kzalloc(BCM47XXPART_BYTES_TO_READ, GFP_KERNEL);
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/* Parse block by block looking for magics */
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for (offset = 0; offset <= master->size - blocksize;
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@@ -82,7 +85,7 @@ static int bcm47xxpart_parse(struct mtd_
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}
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/* Read beginning of the block */
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- if (mtd_read(master, offset, max_bytes_to_read,
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+ if (mtd_read(master, offset, BCM47XXPART_BYTES_TO_READ,
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&bytes_read, (uint8_t *)buf) < 0) {
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pr_err("mtd_read error while parsing (offset: 0x%X)!\n",
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offset);
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@@ -97,16 +100,9 @@ static int bcm47xxpart_parse(struct mtd_
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}
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/* Standard NVRAM */
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- if (buf[0x000 / 4] == NVRAM_HEADER ||
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- buf[0x1000 / 4] == NVRAM_HEADER ||
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- buf[0x8000 / 4] == NVRAM_HEADER ||
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- (blocksize == 0x20000 && (
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- buf[0x10000 / 4] == NVRAM_HEADER ||
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- buf[0x11000 / 4] == NVRAM_HEADER ||
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- buf[0x18000 / 4] == NVRAM_HEADER))) {
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+ if (buf[0x000 / 4] == NVRAM_HEADER) {
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bcm47xxpart_add_part(&parts[curr_part++], "nvram",
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offset, 0);
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- offset = rounddown(offset, blocksize);
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continue;
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}
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