AMD's Alex Deucher has taken the Mesa r500test
branch maintained by David Airlie for the open-source ATI R500 work and has pushed it into Mesa's r500-support
branch. This branch is for those looking to play with the initial open-source R500 DRI (Direct Rendering Infrastructure) support. Alex has also added in the remaining R500 PCI IDs so that all of you with Radeon X1000 hardware should be able to more easily experience the joys of hardware-accelerated glxgears
(Okay, it's not quite as exciting as ET:QW or Doom 3 but still a major milestone).
Still left to be tackled in regards to R500 DRI support is code cleansing, fixing the rasterizer setup, R500 fragment shader support, and as Alex says on his blog
there are other new and exciting features. Those interested in experimental RadeonHD DRM support can click here