K8 MTRR reboot on Solo

[Stefan Reinauer]

Hi,

I came a bit further with debugging my mysterious reboots after setting
up mtrr. This only happens if I build the image on an AMD64
distribution. With an older x86 distribution, the resulting image is 
operable.

Either my romcc changes were somewhat incomplete, or gcc -m32 on Opteron 
behaves different than gcc on a 32bit machine.

Stefan