By datasheet, do you mean the equivalent of a document detailing all the innards and details of the IC's down to the Opcodes/datapath?

Because I've gotten basically down to apparently what you're to write drivers for OSes with, and I know there is the annoying "teehee, let's implement OpenGL calls in firmware so the open source software is a stupid passthrough interface to the IC" which is understandably frustrating given I'd hoped to use my Pi to finally get around to driving graphics hardware to do something useful I can grok, but it's far from documentationless unless I'm missing something fundamental.