On Thu, Apr 14, 2011 at 05:34:46PM -0400, Alex Deucher wrote: > On Thu, Apr 14, 2011 at 5:09 PM, Joerg Roedel <joro@xxxxxxxxxx> wrote: > > 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. > > I know what it's for. In the IGP graphics chip is also part of the > north bridge, but it may not be related at all. Okay, just wanted to make clear that it is part of the CPU and not of the chipset :) > > 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. I havn't tested with an hd5000 > > yet. The failing notebook has an hd4200 mobility. > > What exact model is the hd3000? Is it IGP GPU or a discrete GPU? It > it's an IGP, it's identical to the hd4200 programming-wise. It is an IGP card, an "ATI Technologies Inc RS780M/RS780MN [Radeon HD 3200 Graphics]" according to lspci. > > Btw. what happens if the gpu accesses an unmapped address in the gtt > > range? > > It's redirected to a dummy page. So there should be no issue too, this is a very weird bug. Joerg _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
