Having seen your
latest post to
misc@, if you are wanting to install OpenBSD 5.0 on a CF card to be inserted into an Alix system, it will be far simpler to set up a PXE & TFTP server, & boot the Alix system from it.
The PXE/TFTP server can be running OpenBSD 4.9 while hosting the 5.0
bsd.rd installation kernel. This information is described in
Section 6.10 of the FAQ.