You need to change the string "/pci/mac-io" to just "mac-io" in
macppc/dev/obio.c and macppc/macppc/autoconf.c. If you have a USB
keyboard as your main keyboard, you need to add "ukbd_cnattach(sc);"
after the config_found line in dev/usb/ukbd.c.

Everything else that works at all is in the tree.

-- Dan