Messages in this thread Patch in this message | | | From | Ondrej Zary <> | Subject | Re: Debugging APM - cat /proc/apm produces oops | Date | Tue, 25 Jul 2006 22:04:57 +0200 |
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This is my "fix" - patches BIOS in shadow RAM. Ugly but allows me to use APM battery status. Probably not worth including in the kernel but it might help someone...
--- linux-2.6.17.5-orig/drivers/pci/quirks.c 2006-07-15 04:38:43.000000000 +0200 +++ linux-2.6.17.5/drivers/pci/quirks.c 2006-07-26 18:41:01.000000000 +0200 @@ -1404,6 +1404,36 @@ } DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NCR, PCI_DEVICE_ID_NCR_53C810, fixup_rev1_53c810); +#ifdef CONFIG_X86 +/* + * Fix DTK FortisPro TOP-5A APM BIOS bug which causes oops on /proc/apm access + * Most probably works only with the latest BIOS rev 2.31 + */ +static void __devinit quirk_dtk_top5a(struct pci_dev *dev) +{ + u8 *patch_addr_1 = __va(0xf2f9d); + u8 orig_1[] = { 0x89, 0x5e, 0xfe }; /* mov [bp-2],bx -> this causes oops */ + u8 patch_1[] = { 0x90, 0x90, 0x90 }; /* 3x nop */ + u8 *patch_addr_2 = __va(0xf2fad); + u8 orig_2[] = { 0x83, 0x7e, 0xfe, 0x01, /* cmp w,[bp-2],1 -> second oops */ + 0x74 }; /* je somewhere -> this must be changed to jmps */ + u8 patch_2[] = { 0x90, 0x90, 0x90, 0x90, 0xeb }; /* 4x nop + jmps */ + u8 shadow_cfg; + + /* Check if it's the buggy BIOS */ + if (memcmp(patch_addr_1, &orig_1[0], ARRAY_SIZE(orig_1)) || + memcmp(patch_addr_2, &orig_2[0], ARRAY_SIZE(orig_2))) + return; + + printk(KERN_INFO "Fixing DTK FortisPro TOP-5A APM BIOS bug\n"); + pci_read_config_byte(dev, 0x59, &shadow_cfg); + pci_write_config_byte(dev, 0x59, 0x20); /* enable shadow BIOS writes */ + memcpy(patch_addr_1, patch_1, ARRAY_SIZE(patch_1)); + memcpy(patch_addr_2, patch_2, ARRAY_SIZE(patch_2)); + pci_write_config_byte(dev, 0x59, shadow_cfg); +} +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82439TX, quirk_dtk_top5a); +#endif /* CONFIG_X86 */ static void pci_do_fixups(struct pci_dev *dev, struct pci_fixup *f, struct pci_fixup *end) { -- Ondrej Zary - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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