It is dying in SimNow on CAR with a triple fault on this code:
/* Clear all MTRRs */
xorl %edx, %edx
movl $fixed_mtrr_msr, %esi
clear_fixed_var_mtrr:
lodsl (%esi), %eax
^^^^^^^^^^^^^^^^^^^^^^
The address is OK, somewhere in high 64KB.
Hey, it's a start!
ron