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    SubjectRe: Linux 2.6.39-rc3
    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 <> 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?

    Earthling Michel Dänzer |
    Libre software enthusiast | Debian, X and DRI developer
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