Hi,

I have a problem getting agpgart/drm to work on my TiBook, I have
tracked the problem down to that suspect looking message.

agpgart: AGP aperture is 16MB @ 0x00
[drm] AGP 0.99 on Unkiwn @ 0x00000000 16MB

which results in the following messages in my XFree86 logs:

[agp] ring handle = 0x0000000
[agp] Could not map ring

Its an ATI Radeon 7500 Mobility M7 on an Apple UniNorth 1.5 chipset.

I think the correct aperture base is one of:

AGP special page: 0xdffff000
aper_base: b8000000 MC_FB_LOC to: bbffb800, MC_AGP_LOC to: ffffc000

-- 
// Gianni Tedesco (gianni at scaramanga dot co dot uk)
lynx --source www.scaramanga.co.uk/gianni-at-ecsc.asc | gpg --import
8646BE7D: 6D9F 2287 870E A2C9 8F60 3A3C 91B5 7669 8646 BE7D