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

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Date:	Thu, 17 May 2007 23:59:01 +0200
From:	Christian Volkmann <haveaniceday@...sv.de>
To:	Dave Jones <davej@...hat.com>,
	Christian Volkmann <haveaniceday@...sv.de>,
	linux-kernel@...r.kernel.org, ak@...e.de,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: 2.6.22-rc1 does not boot on VIA C3_2 cause of X86_CMPXCHG64

Dave Jones wrote:
> On Thu, May 17, 2007 at 11:28:01PM +0200, Christian Volkmann wrote:
> Though, I've *never* seen or even heard of someone with one of those CPUs,
> so whether we need to care is questionable. The mp6 did actually make it
> to manufacture aparently, but I don't think anyone actually bought one.
> http://en.wikipedia.org/wiki/Rise_Technology for a pic of this mythical beast.
> 
> 	Dave
> 

> My VIA C7 has the same problem, boots on 486 but not on C3-2 or C7
>
> --
> Hans

I suppose VIA C7 is another candidate for verify_cpu.S

Maybe something like this in assembler might be useful:
if ( ! Intel && ! AMD )
{
   andl    $~NEED_CMPXCHG64,%edx
}

This would not really harm anything but avoid this problem.
But I just don't know x86 to do this proper.

Christian
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