kernel-2.6-git (rev. d93a8f829fe1d2f3002f2c6ddb553d12db420412, latest on the moment).
Should be 512mb, but detected as 256mb.
Created attachment 30304 [details] [review]
The drier currently limits vram to 256 MB regardless of how much is on the card due to limitations in the max pci bar size. The most vram the CPU can map is 256 MB; the rest is only accessible via the GPU.
Proper support for more the 256 MB of vram will come eventually.