On Fri, Apr 15, 2011 at 10:26:34AM +0200, Michel Dänzer wrote: > On Don, 2011-04-14 at 23:09 +0200, Joerg Roedel wrote: > > On Thu, Apr 14, 2011 at 10:28:43AM -0400, Alex Deucher wrote: > > > On Thu, Apr 14, 2011 at 4:56 AM, Joerg Roedel <joro@xxxxxxxxxx> wrote: > > > > And this makes a difference, with this change on-top of -rc3 the box boots > > > > fine. So there seems to be some dependency between the GART base and the GTT > > > > base even when they are in different address spaces. > > > > > > > > Alex, can you comment on this? > > > > > > As Dave said, they are completely different addresses spaces. You > > > could put the GPU aperture at 0 if you wanted (in fact we do on some > > > chips). Perhaps there's some strange interaction with the nb gart > > > since the nb gart on that chipset was designed to be used for graphics > > > and the rs780/880 can be configured to use an agp aperture. > > > Unfortunately, I'm not that familiar with the nb gart. > > > > Actually, the nb gart is part of the cpu. It is part of the cpu north > > bridge and can translate io and cpu accesses. In fact, it is a remapper > > of physical memory addresses. > > > > The problem seems to be related to specific gpu chips. On another > > notebook with an hd3000 card gtt and the nb gart aperture are both on > > 0xa0000000 too but the box works fine. > > Wasn't the working theory that the problem occurs if those two values > aren't the same? Yes it is, but this doesn't seem to be problematic on all readeon GPU chips. Joerg _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
