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Welcome! I have whitelisted you, so you can post anywhere in DevGurus.
I moved this topic into "General Discussions." Questions about actual driver development are pretty rare.
Not sure how much help you'll find, since this is an unusual topic. But here are a couple of resources that might help.
AMD's hardware documentation is here: http://developer.amd.com/resources/documentation-articles/developer-guides-manuals/
You can search to see what information is available for the processor you want to create the driver for.
If you are working in Linux there are open source drivers. You may be able to get the source code for those. You might start here: RadeonFeature.
A wikipedia page also discusses this, and that might be of help: Free and open-source graphics device driver - Wikipedia, the free encyclopedia
Good luck! I hope this helps.
The links you provided would be great place to start.