[Openchrome-devel] Early TTM patch
Thu Jan 27 07:48:31 PST 2011
> > This patch is against the drm-next branch. Give it a try with the KMS xorg
> > branch and let me know how it works. While you test that I'm going to put
> > some gem test together to exercise the driver.
> The VRAM probing for the KM400/KM400A/P4M800 (chipset id 0x7205) will
> fail when on the P4M800 variant because it's using a different host
> bridge and then the VRAM needs to be read from another register. The
> chipset to host bridge mapping seems to be 1:1 in all but this case.
> The VRAM probing is broken in this case too for UMS, but it might worths
> fixing it right from the start for KMS.
> There's a bug filed for this issue :
> for a host bridge probing implementation.
Just like the SiS family and some embedded Nvidia chipsets. The current
code in my patch should work since it does talk to the north bridge. I'm
going to need to access the north bridge anyways to get the memory type
that the card uses.
I did post a second version of the TTM patch at the same place.
The big difference is that besides the old api of allocation a chunk of
memory at a offset in a particular region you can now allocate the
size you want from any memory pool, which is the expected behavior of
TTM/GEM. I did test that using a special libkms with openchrome support
that I put together. Still some issues tho with freeing the memory.
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