reboot hangs

Hi,

I'm a BSD newbie, trying to get FreeBSD installed (not a Unix newbie 
though - a lot of linux and Solaris experience, plus BSD in its MacOS 
flavor).

So far, the install has gone very smoothly, with one minor glitch:  a 
reboot hangs after reporting "Rebooting..." - which seems to be 
generated by the loader code, just before it initiates a reboot

As far as I can tell, this seems to be a BIOS/motherboard issue (Foxconn 
661MXF7M1-S), but it also seems to be a problem people run into with 
various other motherboards and BIOSs.

In the Linux world, adding "reboot=b" to kernel options (use the BIOS 
reboot function) solves the problem nicely, but I can't seem to find an 
equivalent for FreeBSD.  Is there one?  Are there any other hacks available?

Thanks very much.

Miles