linux-kernel - Re: i686 quirk for AMD Geode

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Message-ID: <4B02D2C1.2070502@zytor.com>
Date:	Tue, 17 Nov 2009 08:43:45 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>, Pavel Machek <pavel@....cz>,
	Matteo Croce <technoboy85@...il.com>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: i686 quirk for AMD Geode

On 11/17/2009 06:34 AM, Lennart Sorensen wrote:
> On Tue, Nov 17, 2009 at 11:59:29AM +0000, Alan Cox wrote:
>>> Trying rdmsr from msr-tools 1.2 gives me:
>>>
>>> # ./rdmsr -x 0x00001810
>>> rdmsr: CPU 0 cannot read MSR 0x00001810
>>>
>>> Hmm, now what?
>>
>> Beats me - I thought the region registers were read/write.
> 
> Actually it seems I can't read any MSRs on it.
> 
> Using the same kernel, same msr module, same rdmsr on a Geode LX system
> works fine.  I can read MSRs no problem.  Seems the msr module isn't
> working on the Geode SC1200 (and hence possibly the GX1).
> 

That would seem highly unlikely ... unless the MSR flag isn't exposed in
CPUID.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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