linux-kernel - Re: i686 quirk for AMD Geode

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Message-ID: <20091118211122.GI15157@caffeine.csclub.uwaterloo.ca>
Date:	Wed, 18 Nov 2009 16:11:22 -0500
From:	lsorense@...lub.uwaterloo.ca (Lennart Sorensen)
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>,
	Valdis.Kletnieks@...edu, 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 Wed, Nov 18, 2009 at 12:59:36PM -0800, H. Peter Anvin wrote:
> On 11/18/2009 12:21 PM, Lennart Sorensen wrote:
> > 
> > OK, I added a bit of debuging print statements to msr.c and I find that
> > calling rdmsr 0x1810 returns error 0xfffffff2 (-14 that is).
> > 
> 
> What this means is the RDMSR instruction traps -- the CPU doesn't
> recognize this as a valid MSR.

Strange how it says that for every value I have tried so far.  Makes me
wonder if there is a register somewhere that disables MSR support.
I did find a lockout value but I can't read that one either (which says
it is always readable).

-- 
Len Sorensen
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