agp on sis 661

[Jeppe Larsen]

I've had some problems with AGP support for the SiS 661 chipset. It seems
to be found:

agp0: <SiS 661 host to AGP bridge> mem 0xe8000000-0xebffffff at device 0.0
on pci0

And this it was sysctl says:

dev.agp.0.%desc: SiS 661 host to AGP bridge
dev.agp.0.%driver: agp
dev.agp.0.%location: slot=0 function=0
dev.agp.0.%pnpinfo: vendor=0x1039 device=0x0661 subvendor=0x1043 subdevice=0x8113 class=0x060000
dev.agp.0.%parent: pci0

And a /dev/agpgart exists.

The real problem appears when I try starting X with the nvidia-drivers.
The SiS 661 chipset is not supported by the nvidia AGP driver (it was the
same under Linux, so I used the AGPGART module there), so I should used
the native FreeBSD AGP support. I have the right NvAGP option in xorg.conf
and everything, but my machine reboots when X is started. No error message
is logged anywhere.
The driver seems to work fine with my gfx-card, a GeForce4 MX 4000,
because X runs fine with AGP disabled, but with half the performance
(glxgears) than I had under Linux.

Does the FreeBSD AGP driver really supports SiS 661 or is it only finding
it? And is there some way to at least get some error-message out from the
spontanous reboot?

If this is not the right list for this sort of thing, then please tell me.

-- 
regards,
Jeppe W. Larsen

"Logic is the beginning of wisdom; not the end."