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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 02:09:16AM +0200, Christian wrote:

> my small VIA C3_2 box does not boot with 2.6.22-rc1.
> It even does not uncompress the kernel.
>
> The configuration as M386 M486 works. But M586 + MVIAC3_2
> does not work.
>
> solution for me, cahnge arch/i386/Kconfig.cpu
>
> --- arch/i386/Kconfig.cpu.before 2007-05-17 01:38:26.000000000 +0200
> +++ arch/i386/Kconfig.cpu 2007-05-17 00:54:52.000000000 +0200
> @@ -299,5 +299,5 @@
>
> config X86_CMPXCHG64
> bool
> - depends on !M386 && !M486
> + depends on !M386 && !M486 && !MVIAC3_2
> default y
>
>
> The related #ifdef is in ./include/asm-i386/cmpxchg.h
> May be cmpxchg8b is not supported by VIAC3_2 ?
>
> May be some other non Intel/AMD need to be excluded from X86_CMPXCHG64 ?
> May be the generic option CONFIG_X86_GENERIC need to switch this off also ?

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)

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?

Dave

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