Installing FreeBSD with undetected USB keyboard

[Kenyon Ralph]

Howdy, longtime Linux user here, finally starting to play with
FreeBSD.  Having a problem getting it installed...

I have a USB Microsoft Natural Keyboard connected to an Intel
SE440BX-2 motherboard.  The keyboard works fine in the BIOS setup and
in Linux booted from a CD.  Booting with a
6.0-RELEASE-i386-bootonly.iso CD gives me no keyboard functionality at
all.

I've tried enabling and disabling "legacy USB support" in the BIOS; no
difference.

I'm thinking that maybe if I set ukbd_load="YES" in
/boot/defaults/loader.conf.local, the keyboard might work.  But there
is no mention of modifying the installation media (either floppy or
CD) in either the Handbook or the Installation Instructions.

Obviously I can't press a key during the boot sequence to enter commands.

I've searched the mailing lists but can't find anybody with a problem
like this before.  Anybody have any ideas, besides get a PS/2
keyboard?

Thanks!

Kenyon