I've posted a few articles about the hurdles involved in doing 
this to port-macppc before. 

	The largest problem is that old-world machines have such a wide 
range of different video chips (Apple, Cirrus Logic, S3, ATI, 3dLabs, 
Matrox, Number 9, IX Micro/IMS, and I think Brooktree for starters). New 
world machines usually have a VGA ROM attached to the frame buffer that we 
can leverage like XF86 4.x does.

	If you're serious about doing this (MacPPC desperately 
needs this, so we can get rid of OpenFirmware once the kernel has loaded), 
check out MkLinux, Darwin, and the PPC Linux flavors and see what they do.

	Good luck,

	Chris

-- 
I'm trying to port NetBSD to my cup of tea, but it keeps kernel panicking 
on refill. This is odd, because I ported it to my toaster and my bookcase 
easily enough and it survives bread- and book-replacement fine.

Any hints?

Jared Earle - http://mail-index.netbsd.org/tech-ports/2002/07/04/0000.html