BTX Halted on a MSI K8T MASTER 2 (AMD Opteron)

[Victor Leo Kallen Soto]

Hello :

I want to install FreeBSD 5.4 (64) on a MSI K8T MASTER 2 (AMD Opteron). 
But the loader freezes immediately after it starts, with the next error :
(am trying to boot from a USB CD/DVD-R/W drive)

BTX loader 1.00 BTX  version is 1.01
Console: internal video/keyboard


int=0000000d     err=00000000     efl=00030206     eip=00003dse
eax=00008001   ebx=00000700    ecx=00000000   edx=0000009f
esi=00000b32    edi=00000000     ebp=00000000   esp=000003d2
cs=f0000 ds=46ca es=46ac fs=0000 gs=0000          ss=9e3d
cs:eip=2e 0f 01 16 88 3d 0f 20-c0 0c 01 0f 22 c0 b8 30
           00 8e c0 0f 20 c0 24 fe-0f 22 c0 eb 00 66 58 c3
ss:esp=01 80 00 00 49 3c 00 00-00 00 32 0b 00 00 00 00
           00 00 f8 03 00 00 00 07-00 00 9f 00 00 00 00 00

How can this be solved ??

Thanks very much.
(I am not subscribed to this list, please cc to my email address).

Victor Kallen