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    SubjectRe: 2.6.22-rc1 does not boot on VIA C3_2 cause of X86_CMPXCHG64
    On Thu, May 17, 2007 at 01:51:34PM +0200, Andi Kleen wrote:

    > > The C3s all have cx8, but it needs to be enabled in an MSR first.
    > > (See arch/i386/kernel/cpu/centaur.c , search for CX8)
    >
    > Sigh. I wonder what genius at VIA came up with that setup.

    It was due to some incompatibility with some older Windows variants iirc.

    > > Did we add code that uses cmpxchg8b before identify_cpu() gets run ?
    > > I've not been paying attention to .22rc (busy trying to beat .21 into shape
    > > for F7) so I may have missed something obvious. Andi?
    >
    > That would be a bit complicated in pure asm code.
    > It's probably best to just not require it as in Christian's patch above.
    > Without SMP support it is not particularly needed anyways; a irq disabling
    > emulation should work.

    *nod*

    Dave

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