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<http://people.freedesktop.org/%7Eagd5f/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 <[email protected]>* wrote: From: Jerome Glisse <[email protected]> Subject: Re: DRM_ERROR("Forcing to 32M GART size (because of ASIC bug ?)\n"); To: "Alex Deucher" <[email protected]> Cc: "Andres Cimmarusti" <[email protected]>, [email protected] 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 > <[email protected]<http://us.mc507.mail.yahoo.com/mc/[email protected]>> 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 ?)\n"); >> } >> >> 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<http://people.freedesktop.org/%7Eagd5f/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
