FreeBSD doesn't boot at Supermicro H8SSL-i2

[Thomas Krause]

Hello,
I got a brand new Supermicro H8SSL-i2
http://www.supermicro.com/Aplus/motherboard/Opteron1000/HT1000/H8SSL-i2.cfm
but FreeBSD i386 6.2 Beta3 doesn't boot, whether if acpi is enabled or not.
The latest BIOS is installed. Here is a picture of the boot process with
verbose logging:
http://moldau.webmatic.de/h8-boot.jpg

Any ideas?

Regards,
Thomas.