Can't boot an upgraded Quadra 605

Hello.  I bumped an old Quadra up with a full 68040 chip
and 132 MB of RAM.  I was able to partition and format the
drive; Mac OS 8.1 boots fine, and OpenBSD 3.6-stable
installed without a hitch.  BSD finds the kernel on the partition,
and will START to boot, and gets as far as

[ using 407118 bytes of bsd a.out symbol table ]

before apparently freezing up.  I let it sit for over an hour once,
hoping that maybe it was just reeeally slow, but it never did
anything.  I've tried different color/resolution settings.  Any
idea what I'm overlooking?  - Andy Silva