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Old 07-22-2010, 02:51 PM
Andres Cimmarusti
 
Default Bug#583933: Bug # 583933: xserver-xorg-video-radeon: Latest radeon + KMS ASIC bug error message

In this xorg-radeon mailing list thread below the issue was discussed and it was stated by the developers that after patch: http://people.freedesktop.org/~agd5f/0001-drm-radeon-kms-fix-gtt-MC-base-alignment-on-rs4xx-rs.patch


The code that causes the DRM error be removed

Please patch kernel 2.6.32 in Squeeze!

Andres

--- On Fri, 7/16/10, Jerome Glisse <glisse@freedesktop.org> wrote:


From: Jerome Glisse <glisse@freedesktop.org>
Subject: Re: DRM_ERROR("Forcing to 32M GART size (because of ASIC bug ?)
");
To: "Alex Deucher" <alexdeucher@gmail.com>

Cc: "Andres Cimmarusti" <andrescimmarusti@yahoo.com>, xorg-driver-ati@lists.x.org
Date: Friday, July 16, 2010, 10:33 AM


On 07/16/2010 09:53 AM, Alex Deucher wrote:
> On Fri, Jul 16, 2010 at 12:45 AM, Andres Cimmarusti
> <andrescimmarusti@yahoo.com>* wrote:

>>
>> In the kernel: drivers/gpu/drm/radeon/rs400.c
>>
>> You will find this piece of code:
>>
>>* * * * * if (rdev->family == CHIP_RS400 || rdev->family == CHIP_RS480) {

>>* * * * * * * * * /* FIXME: RS400&* RS480 seems to have issue with GART size
>>* * * * * * * * **** if 4G of system memory (needs more testing) */
>>* * * * * * * * * rdev->mc.gtt_size = 32 * 1024 * 1024;

>>* * * * * * * * * DRM_ERROR("Forcing to 32M GART size (because of ASIC bug ?)
");
>>* * * * * }
>>
>>
I don't have 4Gb of system memory (I have 2Gb DDR) so I deleted the
whole thing and compiled my kernel fine. Testing it didn't lead me to
any problems. My gtt size went from 32Mb to 512Mb. Is this ok? my card
is supposed to have 128 Mb of VRAM.
>>
>> Also if the
issue is only when you are above 4Gb of system memory, couldn't there
be some sort of if statement that could probe the memory and if it was
bigger than 4G then it would force 32mb on gtt memory.?
>>
>> should I play it safe? I guess I don't really understand what gtt memory is
>>
>
> GTT is system memory that is mapped into the video card's address

> space so it can be read from or rendered to; it's separate from vram.
> I don't recall why we added that quirk, Jerome or Dave may remember,
> but I suspect, it should be ok to remove it after this patch:

> http://people.freedesktop.org/~agd5f/0001-drm-radeon-kms-fix-gtt-MC-base-alignment-on-rs4xx-rs.patch

> is applied.
>
> Alex

Yes i think it should be ok to remove it after your patch.
I would like to test it but might not have the hw handy.

Cheers,
Jerome
 

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