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    SubjectRe: Athlon: Try this (was: Re: Athlon bug stomping #2)
    >  > > +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);
    >> > + }
    >> > +}
    >> >
    >> > Well, these are cosmetic changes anyway...
    >> > What is more important now:
    >> > 1) Do we have people who still see Athlon bug with the patch?
    >> > 2) Do Alan read these messages? ;-)
    >> Im watching the discussion with interest. If it proves to be the magic
    >> bullet I will ask VIA for guidance on the issue
    >Not being a developer or guru on the internal software workings of the
    >hardware here, I have to ask, does this clear up some bug, or does it
    >disable the optimizations causing the problem? Is this a *fix* or a

    AFAICT, it's a *fix*. The register in question is "for debug use
    only, never write anything other than zero in it" but generally shows
    non-zero when a faulty BIOS is installed. We're zeroing the bit that
    appears to cause the problem. It's highly unlikely to be an extra
    optimisation - if it is, it's an unsafe one.

    from: Jonathan "Chromatix" Morton
    mail: (not for attachments)
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