Installer randomly hangs during Powermac G4 install

Hello,

I have a Powermac G4 "Quicksilver" / dual 800 MHz / 1.5G RAM machine
that has a 802.11b/g Wireless PCI card (with a Marvell Libertas 8335
chipset). I currently only have wireless net access, and I can get
that in Linux or FreeBSD only on x86 platforms using ndiswrapper (or
equivalent). Thanks to the great folks at OpenBSD, there's a
reverse-engineered 'malo(4)' driver for this chipset that works on any
platform including ppc.

http://www.openbsd.org/cgi-bin/man.cgi?query=malo

So, I did manage to get the card up and working in OpenBSD 4.2 on an
x86 box, but have since replaced the box with the aforementioned
Powermac. The problem now is that I am not able to complete the
installation of OpenBSD due to various "hangs" at different points
during the install. I have tried using both install42.iso and
install43.iso. By "hang", i mean that the installer (and the machine)
simply stops responding at arbitrary points during the install, and I
can't do anything save a hard reboot. The points at which the hangs
are happening roughly in order of occurrence:

- When drives are being formatted after exiting the label editor
- When the sets are being retrieved from the CD (specifically while
retrieving base42)
- When I go into the shell and fsck a disk that had a bad superblock
(which happened because I had to hard-reboot)

The obvious problems I can think of:
- The disk is bad: Actually, it's fine. It's a 120G western digital
disk that has been formatted (and I just reformatted / refscked it
using the Debian Linux Installer to make sure). The entire disk is for
OpenBSD, and I've tried with both MBR and HFS partition tables to no
avail.
- The installation media or iso is bad: Again, don't think so. The
md5s match, I tried with both install42.iso and install43.iso (from
snapshots), and with two different CD-Rs.

I've never had a crash during a Linux install (I've done it 4 or 5
times) on this machine. I am also unable to try installing OpenBSD
using cd42.iso as I need the full system first before I can install
malo(4) and get the wireless card up.

Any suggestions for getting more debugging output or making the
install go to completion are appreciated (I've been trying to get this
working for quite a while).

thank you,
marq