On Friday we talked about ATI preparing to release more GPU documentation
to the public and without any Non-Disclosure Agreement, and today we have a few new details regarding the specifications for earlier Radeon GPUs. AMD's John Bridgman has posted in this Phoronix Forums thread
that he is trying to re-release the GPU specifications for the R100~200 generation of graphics processors. The to be released R300/400 documentation will also assist in further enhancing the Radeon R100/200 driver. John had also mentioned that they will probably be able to assist open-source developers in any questions that they have for even older ATI GPUs as well (ATI Rage era).