linux-kernel - Re: [PATCH] x86, aperture: Check for GART before accessing GART registers

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Date:	Tue, 14 Apr 2015 20:22:48 +0200
From:	Jörg-Volker Peetz <jvpeetz@....de>
To:	Borislav Petkov <bp@...en8.de>
CC:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	x86@...nel.org, bhelgaas@...gle.com, Suravee.Suthikulpanit@....com,
	joro@...tes.org
Subject: Re: [PATCH] x86, aperture: Check for GART before accessing GART registers

Hi,

Borislav Petkov wrote on 04/14/2015 13:33:
> On Tue, Apr 14, 2015 at 01:15:43PM +0200, Jörg-Volker Peetz wrote:
>> Hi,
> 
> Hi,
> 
> please do not top-post.
> 
>> tried this patch on my HP Pavilion notebook wiht AMD Phenom II processor. The
>> BIOS has no IOMMU option.
>> With this patch I'm still seeing the AGP messages mention in the patch description.
>> Is this processor affected at all?
> 
> Your CPU has an AGP bridge but the BIOS doesn't leave an aperture so the
> kernel has to do it. Read the message.
> 
>> /proc/cpuinfo says "cpu family" 16. That is 10h?
> 
> Yes.
> 

thank you for the explanation. Somehow I thought I had a newer CPU w/o GART
registers, but I misread the patch. Maybe wishful thinking, in the hope to save
64 MB :-(
Sorry for the noise.
-- 
Regards,
jvp.

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