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    SubjectRe: [PATCH] again: Re: Athlon kernel crash (i686 works)
    Yes, this patch shlud be included as configuration option,
    (also because of the long nights spended discusing this topic and
    seeing this thousands of lspci-vvvxxx output :) ), but not enabled
    byu default and with a VERY VERY clear help.

    Luigi

    On Tue, 9 Oct 2001, VDA wrote:

    > Oh no.
    >
    > Anybody still insist that 'Athlon bug' patch is not to be
    > included into mainstream kernel?
    > If someone doesn't like it, feel free to make it a config
    > option (enabled by default!) and submit an updated patch.
    > My original patch against 2.4.9 is at the end.
    >
    > Tuesday, October 09, 2001, 11:32:24 AM,
    > "Marco Berizzi" <pupilla@hotmail.com> wrote:
    > MB> I updated my motherboard from ASUS A7V to ABIT KT7A (VIA Apollo KT133A
    > MB> chipset). The kernel I had (2.4.10) started crashing on boot usually
    > MB> right after starting init. I tryed a i686 kernel and noticed it works
    > MB> OK, so I recompiled my crashy kernel only switching the processor type
    > MB> and it also worked. Changed it back to Athlon/K7/Duron and it starts
    > MB> crashing.
    >
    > MB> I also search the mailing list. My mother board is KT7A series v1.3 with
    > MB> bios revision 4T (I also try with 3N, same results). K7 at 1333MHz. BIOS
    > MB> settings are default (except I have disabled all BIOS/video shadow).
    > MB> After flash I also reset CMOS via hardware jumper.
    >
    > MB> Is there any solution to this (except compiling kernel for 6x86)?
    > --
    > Best regards, VDA
    > mailto:VDA@port.imtp.ilyichevsk.odessa.ua
    >
    > --- pci-pc.c.orig Sun Aug 12 15:54:07 2001
    > +++ pci-pc.c Tue Sep 18 16:45:21 2001
    > @@ -948,6 +948,26 @@
    > d->irq = 9;
    > }
    >
    > +/* Fixes some oopses on Athlon optimized
    > + * fast_copy_page when it uses 'movntq's
    > + * instead of 'movq's on Athlon/Duron optimized kernels.
    > + * Bit 7 at offset 0x55 seems to be responsible:
    > + * > Device 0 Offset 55 - Debug (RW)
    > + * > Bits 7-0: Reserved (do not program). default = 0
    > + * ABIT KT7A 3R BIOS: 0x89 (oopses)
    > + * ABIT KT7A YH BIOS: 0x00 (works)
    > + */
    > +static void __init pci_fixup_athlon_bug(struct pci_dev *d)
    > +{
    > + u8 v;
    > + pci_read_config_byte(d, 0x55, &v);
    > + if(v & 0x80) {
    > + printk(KERN_NOTICE "Stomping on Athlon bug.\n");
    > + v &= 0x7f; /* clear bit 55.7 */
    > + pci_write_config_byte(d, 0x55, v);
    > + }
    > +}
    > +
    > struct pci_fixup pcibios_fixups[] = {
    > { PCI_FIXUP_HEADER, PCI_VENDOR_ID_INTEL,
    > PCI_DEVICE_ID_INTEL_82451NX, pci_fixup_i450nx },
    > { PCI_FIXUP_HEADER, PCI_VENDOR_ID_INTEL,
    > PCI_DEVICE_ID_INTEL_82454GX, pci_fixup_i450gx },
    > @@ -961,6 +981,7 @@
    > /* Our bus code shouldnt need this fixup any more. Delete once
    > verified */
    > { PCI_FIXUP_HEADER, PCI_VENDOR_ID_COMPAQ,
    > PCI_DEVICE_ID_COMPAQ_6010, pci_fixup_compaq },
    > #endif
    > + { PCI_FIXUP_HEADER, PCI_VENDOR_ID_VIA,
    > PCI_DEVICE_ID_VIA_8363_0, pci_fixup_athlon_bug },
    > { PCI_FIXUP_HEADER, PCI_VENDOR_ID_UMC,
    > PCI_DEVICE_ID_UMC_UM8886BF, pci_fixup_umc_ide },
    > { PCI_FIXUP_HEADER, PCI_VENDOR_ID_SI,
    > PCI_DEVICE_ID_SI_5513, pci_fixup_ide_trash },
    > { PCI_FIXUP_HEADER, PCI_ANY_ID, PCI_ANY_ID,
    > pci_fixup_ide_bases },
    >
    >
    > -
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