linux-kernel - Re: K8 ECC error with linux-2.6.32

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Message-ID: <20091216071443.GA18814@aftab>
Date:	Wed, 16 Dec 2009 08:14:43 +0100
From:	Borislav Petkov <borislav.petkov@....com>
To:	Johannes Hirte <johannes.hirte@....tu-ilmenau.de>
CC:	Borislav Petkov <petkovbb@...glemail.com>,
	linux-kernel@...r.kernel.org
Subject: Re: K8 ECC error with linux-2.6.32

On Tue, Dec 15, 2009 at 11:00:46PM +0100, Johannes Hirte wrote:

>
> This patch (as the BIOS option) will only disable the error reports. The error 
> itself will still occur, right? So necessary to find out why the radeon driver 
> trigger this error.

Because the graphics driver does aperture accesses with no
matching GART translation, and the hw generates mchecks for
that. The whole story on GART table walk errors is in section
"13.10.1 GART Table Walk Error Reporting" in the document here:
http://support.amd.com/us/Processor_TechDocs/32559.pdf

I can't say for sure about your BIOS, but if it is done as described in
the abovementioned section, the BIOS option should disable logging of
the error, which implies reporting too.

The patch is still needed for machines that do not have that BIOS
option.

-- 
Regards/Gruss,
Boris.

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