I've grabbed kernel source as of 20010926, and compiled in the AGP 
Aperature code in the kernel. Here's the dmesg line:
	agp0 at pchb0: aperture at 0xf8000000, size 0x4000000
XFree86 4.1.0 identifies my chip as a i810-dc100 

Frank van der Linden's /dev/agp code tests fine for this setup. However,
using XFree86-current results in a blank screen and a complete
kernel-level lock-up (the agpgart LKM, 1.5X, and XFree86 4.1.0 behaved
exactly the same way). I haven't tried getting a stack trace, although
I can if it'd help diagnosing this.

I've compiled NetBSD-current's xc (from 9/26), but its server so far says 
	SVGA: PCI: Intel Unknown chipset (0x7121) rev 3, Memory @ 0xf8000000, 0xf4000000
even with i810 as the only device in the svga server. It also gives
	SVGA: error doing ioctl(GARTIOCINFO): Invalid argument
and dies. I assume this is because /dev/agp doesn't completely emulate
the agpgart interface.

Since my poor i810 doesn't even have enough get up & go to run as a
generic VGA without AGP memory, could someone help me figure out where
to go from here?

Thanks,
David

-- 
David W. Rankin, Jr.     Christian, Husband, Father, and UNIX Sysadmin. 
   "We're the technical experts. We were hired so that management could
    ignore our recommendations and tell us how to do our jobs."
       -- Mike Andrews in <eUJE5.880$ln6.119642@news.flash.net>