The problem is the following: there is only one company that makes videocards
that run with fully free drivers. It is ironically Intel. For example the
x3000 and x4500 have free drivers and do not require binary blobs in the
kernel.
However, the motherboards that use those videocards run on chipsets that have
no support by coreboot. I asked on the coreboot mailing list and that's more
or less what one of the devs answered me: "coreboot does not run with this
type of chipset. It would require a lot of difficult backwards engineering to
make coreboot run on these motherboards. It will not happen in the
foreseeable future."
So at the moment you cannot run a fully free system, that has 3D
acceleration. You either have 3D acceleration plus a non-free bios, or a free
bios with no 3D acceleration (a system with an AMD CPU and a Radeon/GeForce
card running in a kind of limited mode with free software drivers).
