linux-kernel - Re: 2.6.22-rc1 does not boot on VIA C3_2 cause of X86

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Date:	Wed, 16 May 2007 20:05:35 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Christian <haveaniceday@...sv.de>, linux-kernel@...r.kernel.org
Subject: Re: 2.6.22-rc1 does not boot on VIA C3_2 cause of X86_CMPXCHG64

Linus Torvalds wrote:
> 
> On Thu, 17 May 2007, Christian wrote:
> 
>> Linus Torvalds wrote:
>>> Can you check? The Nehemian (C3-2) should be model 9 or greater.
>> Yes, it's a Nehemiah
> 
> Ok. If so, we should blacklist both MCYRIXIII and MVIAC3_2, I suspect.
> 
>> lola:~ # cat /proc/cpuinfo
>> flags           : fpu vme de pse tsc msr cx8 sep mtrr pge cmov pat mmx fxsr sse rng rng_en ace ace_en
> 
> However, it does seem to *claim* to support "cx8" aka cmpxchg8b. What's up 
> with that?

It gets turned on by the code in arch/i386/kernel/cpu.  It's just that
the new code that Andi added runs during setup, i.e. in real mode, so
*way* earlier than that.

	-hpa
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