Open GPU Documentation by AMD
Chip manufacturer AMD has released documentation for its ATI graphics chips on the "Open GPU Documentation" website.
The website, which was set up just recently, is part of the AMD homepage. AMD uses it to provide comprehensive documentation at register level for AMD graphics chips. Thus far, documentation for the AMD R5xx, AMD R6xx and AMD RS6xx series chips has been published. According to AMD this includes both information on chips for both desktops and mobile devices. As the website says: "Documents for mobile chips are a superset of the desktop chip documentation; they contain all the desktop chip information as well as any relevant mobile additions." On top of this, AMD has set up a separate email address for queries from developers.
The published documents, titled M56, M76, RV630 and RS690, have been publically available since September 2007 via the X.Org website. Documentation for the 3D and R600 2D is likely to follow in the near future.
The "Open GPU Documentation" label implies that the documentation does not bind developers to any further commitments, however, this has not always been the case. In the period leading up to the release, there were contradictory reports stating that the documentation would only be made available to developers after signing a confidentiality agreement (see the Linux Magazine report here).
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