[radeonhd] r6xx-r7xx-support: getting AGP based card to work

Hi Alex, for the past weeks i was desperately trying to get AGP based card to work with the r6xx-r7xx-support branch. Unfortunately i couldn't figure out how to set up the AGP stuff correctly inside the hardware. So i remembered that you suggested on irc to force the card to PCI mode and work with that instead. After a week of try and error i've got r600_demo to work yesterday and today i was even able to watch videos with mplayer though Xv on my RV630 AGP card. Patches are attached, this doesn't seems to be the ideal way, but at least AGP cards can be tested now. Bye, Christian. PS: Resending the mail because i messed up the radeonhd and dri mailing list addresses.