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Alex Chadwick has done a fantastic job on this. He's just finished his first year of the undergraduate CS course, and has spent the summer interning for us at the computer lab working on this. It's fair to say that it's more a guide to bare-metal programming on the Raspberry Pi right now, but Alex is planning to add further material. I think a contribution many hobbyist developers will find useful is his minimal USB HID driver, which should hopefully be far easier to put in to your own minimal OS than the dwc_otg driver used in Linux (and probably a more concise source for learning what you need to know about the Raspberry Pi's USB controller).

VideoCore version anyone? :-)

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