thanks to all those who answered my /dev/mem questions!

I eventually decided that /dev/mem does not support 
the mmap() system call, by looking at conf.c and mem.c

I can, however, open /dev/mem O_RDWR by changing 
the kernel security level back to 0.  Unfortunately,
(but perhaps wisely) only process 1 can do this,
so I had to recompile kern_sysctl.c to do it.

I was trying to access the VIA from user space to
hack on the ADB without recoompiling the kernel and
rebooting everytime I try something.  This can probably
be done w/o mmap().

-Daniel Risacher