Powerpc port

[K. Bradford]

I have installed 7.0-RELEASE on an old Mac G4.
I have cvs'ed the latest sources (using the RELENG_7 tag)
in order to track 7.0-STABLE.

The problem:  I can boot only off the FreeBSD install CD,
by breaking into open firmware upon bootup like this:

0 > boot mac-io/ata-3 at 20000/disk at 1:,\boot\boot.tbxi

Open firmware loads this boot loader which then automagically
loads and runs the FreeBSD loader.  Then, I interrupt using the
space bar to get to the loader prompt and explicitly set the
root device to be the hard drive partition.

OK  set rootdev=mac-io/ata-4 at 1f000/disk at 0:3
(My FreeBSD root partition is 3).

Kernel boots up, mounts / off the hard drive and the system
runs fine.

Can someone advise me how to set up everything correctly
on the hard drive so I don't have to jump through all these hoops?

I'm guessing boot.tbxi is needed somewhere under /boot,
but I don't think open firmware can read a BSD partition anyway.

Documentation on the powerpc port  seems sparse.  Could
someone please point me in the right direction, or provide
brief instructions here.  As always, any help/advice is greatly
appreciated.