While Intel has long backed an open-source graphics driver for
their integrated graphics driver, it was not up until last year when
Intel released the i965/G35 documentation that there was public,
NDA-free documentation concerning their newer IGPs. Later that year they
then released the GMA X4500HD series and since then we have been waiting
for them to push out public documentation concerning their G45 chipset.
Well, Intel has finally come to the table with this documentation and it
is very extensive. This documentation drop today is split into several
volumes and makes up well over 1,000 pages of Intel hardware
documentation and register descriptions that are available under the
Creative Common Attribution, No Derivative Works license.