Hello,

after some more hacking to find why XFree sometimes fails to map 
certain memory ranges without any apparent reason I think I've found 
the reason - XFree doesn't use /dev/mem at all, it uses /dev/wscons0 
for both, memory and console access. Obviously wscons does some sanity 
checks when mapping things - this works well on x86 but fails horribly 
on macppc. This leaves two possible solutions - hack XFree to use 
/dev/mem for screen memory access or hack the ofb driver to allow more 
memory mappings - like the vga driver does. The cleaner solution is 
obviously to hack ofb and send-pr the result instead of buggering 
XFree.

have fun
Michael