Hm. If this is like the other motherboard bits i've looked up then the AGPGART and APIC bits will hew pretty close to some published implementation. If that's so it won't be so difficult for the kernel guys to put in support for this chipset. Does that mean it's a political issue within the nVidia org, or perhaps a legal problem?
Anyway if there's anything we can do from the outside to help, let us know.