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    SubjectRe: 2.6.0-test9-bk16 ALi M5229 kernel boot error
    On Tue, Nov 11, 2003 at 10:58:45PM -0800, David S. Miller wrote:
    > On Wed, 12 Nov 2003 04:31:34 +0000
    > wrote:
    > > Wrong fix, AFAICS. Original condition is bogus, no arguments here.
    > > However, the point is
    > > "tweak our southbridge only if northbridge is known to be OK with that"
    > > and not
    > > "tweak southbridge only if it's ours"
    > >
    > > IOW, proper check is || of those two.
    > I agree with Al's analysis, and this is the kind of logic needed on
    > sparc64 boxes as well.

    I'm not sure there was any logic at all, given extremely misleading
    comments in the original code. That "south-bridge's enable bit" stands
    for "enable input pins for 80-conductor cable detection" according
    to my (rather sparse) docs, and I don't understand why the hell it has
    anything to do with a northbridge.
    Someone with a more complete ALi documentation ought to verify that...

    > Indeed, blindly deref'ing 'isa_dev' here was pretty bogus :)

    Perhaps the source of this bug was the fact that M5229 controllers
    are always part of the southbridge chip and therefore respective
    "isa_dev" must exist. However, PCI IDs are re-writable on newer
    ALi chips, which was probably the case.

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