Trying to boot a supermicro H8DMT board

Hi,

I was given these SMC h8DMT boards to experiment with.
(For liquid cooling)

Theze are server board that normally go into twin board systems.
2 Opteron 2380 per board.

It sort of boots, and gets to:
     Beasty loader
     then booting the kernel after the spinner
    prints the first few lines of boot output, like what compilers is used
    and then output stops.

I guess that it thinks it needs to write the rest to either serial console
or something else.

Does this sound familiar to anybody?
What do I need to toggle to keep writing where it started?

Thanx,
--WjW