Hello,

>> Some progress - the got around the dreaded "can't map video memory
>> [a0000,10000]", although I don't have the faintest idea what went 
>> wrong
>> or why it works now.
>
> Are you perhaps seeing it work in single-user mode and not work in
> multi-user?  If so, it's probably the securelevel / INSECURE option.

No, the box runs multiuser and the Xserver as root. Only one single 
mmap() fails - the others which map the linear framebuffer, voodoo3 
specific registers and so on work - but succeeds when using a different 
file descriptor on /dev/mem. The file descriptor XFree uses isn't 
corrupted or anything, it's just picky about this single memory range 
for some weird reason.

have fun
Michael