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I have a question, however. What about the source of the DRM microcode? Without that the driver can't be considered fully open source.
I didn't think the Intel GPUs used loadable microcode, but I could be wrong. All of the .g4a and .g4b files I saw looked like driver code (shader code called by the driver, to be precise). Anyways, the use of microcode blobs seems to be generally accepted, although there are occasional pushes to have them loaded from user space so the kernel guys don't have to feel dirty.
EDIT - geez, Intel shader code is nearly as hard to read as ours
re: ongoing 5xx love, I think the plan is to implement KMS/MM all the way back to R100 and Gallium3D/GL2 as far back as R300, so no worries.