"Just hours before the start of FOSDEM 2008 in late
February, AMD had released their R500 3D programming documentation.
This documentation paved the way for open-source developers to
begin working on a Mesa driver that would extend the earlier
R300/400 series support to enable OpenGL acceleration on the Radeon
X1000 series. This was also the first public documentation drop
concerning 3D support since AMD's open-source strategy announcement
last September. Following the 3D documentation release, two
revisions were made to add in more technical details. The first
revision added in just four pages while the second had detailed
their command processor.
"Up to that point all of the work was going into enabling
mode-setting support and other basic functionality across the R500
and R600 series in the xf86-video-radeonhd driver (and then
xf86-video-ati through AtomBIOS). Right after they announced their
open-source initiative they had released 900 pages of
specifications and then in the months that followed they released a
lot more documentation."