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49 lines
1.4 KiB
49 lines
1.4 KiB
From fb1e2c8a1073297f4674ca90c7d533de5187d158 Mon Sep 17 00:00:00 2001
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From: Jonas Gorski <jogo@openwrt.org>
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Date: Sat, 9 Feb 2013 12:09:53 +0100
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Subject: [PATCH] MIPS: BCM63XX: handle huawei nvram layout
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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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Huawei uses a custom nvram layout, extending it with additional 32
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byte field. This pushes also the checksum further, causing it to
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always fail the check.
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Add an additional crc check for handling this modified nvram layout
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based on the different size.
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Reported-by: Álvaro Fernández Rojas <noltari@gmail.com>
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Signed-off-by: Jonas Gorski <jogo@openwrt.org>
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---
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arch/mips/bcm63xx/nvram.c | 18 +++++++++++++++++-
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1 file changed, 17 insertions(+), 1 deletion(-)
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--- a/arch/mips/bcm63xx/nvram.c
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+++ b/arch/mips/bcm63xx/nvram.c
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@@ -59,8 +59,24 @@ int __init bcm63xx_nvram_init(void *addr
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crc = crc32_le(~0, (u8 *)&nvram, check_len);
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- if (crc != expected_crc)
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+ if (crc != expected_crc) {
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+ /* huawei uses a modified nvram that is 32 bytes longer */
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+ if (nvram.version == 2 && !strncmp(nvram.name, "HW5", 3)) {
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+ check_len += 32;
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+
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+ /* restore old value */
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+ nvram.checksum_old = expected_crc;
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+ expected_crc = *(u32 *)&nvram.reserved3[28];
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+ /* zero the checksum field */
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+ memset(&nvram.reserved3[28], 0, 4);
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+
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+ crc = crc32_le(~0, (u8 *)&nvram, check_len);
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+
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+ if (crc == expected_crc)
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+ return 0;
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+ }
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return -EINVAL;
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+ }
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return 0;
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}
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