Hello,
>
> It's the weirdy 32-bit Sparc with OFW & PCI. Text mode works, but from
> failing miserably to get X working myself on it, I'm not sure if 
> getting
> X working this way would be easier rather than trying to drive the
> framebuffer hardware directly, if I understand what this does 
> correctly.
I'm trying to get XFree86 to work on a Ultra10. Since it wants wscons 
support and I prefer hacking the kernel instead of XFree I added a 
console driver which uses wsdisplay.

> All I seem to remember is that the X sources were quite rigid about 
> what
> hardware a 32-bit Sparc had, and PCI wasn't one of them.

Yes, Xsun and friends support only some SBus hardware as far as I know. 
The Ultra10 has a PCI ATI Rage onboard so if I'm successful it 
shouldn't be too problematic to get the JavaStation to work too.
But don't hold your breath, it's still pretty bug-ridden.

have fun
Michael