[Bug 35457] [rs690m] Graphics corruption with ati x1200

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Wed May 9 06:48:46 PDT 2012


--- Comment #42 from Alex Deucher <agd5f at yahoo.com> 2012-05-09 06:48:46 PDT ---
(In reply to comment #39)
> I do have a question for devs... I have been all over the initialization code
> and I cannot find a place where the sideport RAM is treated as distinct from
> the UMA "vram".  Is this stuff set up by the atombios? Is there a way to see
> what hardware addresses ranges are assigned? Is there a way to fix the GART
> (table) if the bios is setting up overlapping or otherwise broken addresses for
> GTT, UMA and sideport vram?

It's not treated separately from UMA from the driver's perspective (or the HW
for that matter).  The hw as an FB aperture that points to stolen system memory
(for UMA only) or some combination of sideport and stolen system memory for
(sideport+UMA or sideport only).  The bios normally sets up the sideport and
UMA as interleaved if both are enabled for maximum performance.  GART is a
separate aperture and has nothing to do with sideport or the stolen system
memory block.

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