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 11:02:05 -0400
From:	Dave Jones <davej@...hat.com>
To:	Andi Kleen <ak@...e.de>
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

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

-- 
http://www.codemonkey.org.uk
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