8.0rc1 not recognizing partitions on EPIA SN

First, I tried to upgrade the normal way.  I built my own kernel and 
installed it, but when I tried to boot it, I got a mountroot> prompt.  
When I printed the devices, instead of seeing ad0s1a and friends, I saw 
ad0a and ad0d (just those two for ad0).  I was still able to use the old 
(7.1) kernel fine.  Thinking it was something to do with the upgrade, I 
tried to do a reinstall.  I chose the default options, but once it got 
to the "last chance..." screen, this happened:

Unable to find device node for /dev/ad0s1b in /dev!
The creation of filesystems will be aborted.

Needless to say, the installation failed.

Like I said in the subject, this is with a VIA EPIA SN motherboard.  The 
hard drive is a CF card in a slot on the board.  The card's worked fine 
in the past, and was detected fine at partitioning time.

Forgive me if this is the wrong list, and please CC me as I am not on 
the mailing list.