The AMD64 Embedded Processors and Chipset Linux Support web page is open for business.
http://www.amd.com/us-en/ConnectivitySolutions/ProductInformation/0,,50_2330...
This page has links to AMD supported open source projects like coreboot and it also links to the public documents. I have updated AMD public documents coreboot wiki page with the new links. http://www.coreboot.org/AMD_Public_Documents
Please let me know if you have any questions, complaints, etc.
Marc