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53 lines
1.7 KiB
Diff
53 lines
1.7 KiB
Diff
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From f0501e81fbaa51cfc8c28c60bc3fc7965fde94f4 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
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Date: Sat, 21 Dec 2013 19:39:12 +0100
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Subject: [PATCH] mtd: bcm47xxpart: alternative MAGIC for board_data partition
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Some devices (like WNDR3700v3) have board_data without MPFR magic, some
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extra header or extra NVRAM around 0x100. In such case we have to look
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for another magic which is BD 0B 0D BD (BD probably stands for Board
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Data). It's located "far far away", so instead of extending buffer add
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another mtd_read.
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Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
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Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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---
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drivers/mtd/bcm47xxpart.c | 16 ++++++++++++++++
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1 file changed, 16 insertions(+)
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--- a/drivers/mtd/bcm47xxpart.c
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+++ b/drivers/mtd/bcm47xxpart.c
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@@ -27,6 +27,7 @@
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/* Magics */
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#define BOARD_DATA_MAGIC 0x5246504D /* MPFR */
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+#define BOARD_DATA_MAGIC2 0xBD0D0BBD
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#define CFE_MAGIC 0x43464531 /* 1EFC */
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#define FACTORY_MAGIC 0x59544346 /* FCTY */
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#define POT_MAGIC1 0x54544f50 /* POTT */
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@@ -192,6 +193,21 @@ static int bcm47xxpart_parse(struct mtd_
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offset, 0);
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continue;
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}
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+
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+ /* Read middle of the block */
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+ if (mtd_read(master, offset + 0x8000, 0x4,
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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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+ continue;
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+ }
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+
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+ /* Some devices (ex. WNDR3700v3) don't have a standard 'MPFR' */
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+ if (buf[0x000 / 4] == BOARD_DATA_MAGIC2) {
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+ bcm47xxpart_add_part(&parts[curr_part++], "board_data",
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+ offset, MTD_WRITEABLE);
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+ continue;
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+ }
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}
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/* Look for NVRAM at the end of the last block. */
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