Question on agp

[Super Bisquit]

I've physically removed the matrox pci card and left the atu radeon agp in
the machine.
Loader.conf has agp_load="YES".
I've had a bit of trouble getting Xorg to configure and deselected setuid
and aglx.
Vesa, ati, radeon, and radeonhd are the only drivers.
I've used the mmap relax from 0 to 1.
Xorg log gives me no devices found.
Does anyone else have the same equipment- Powermac g4 quicksilver agp?
What steps am I missing and where do I need to look?
Thanks,
 Desmond