64 bit powerpc

Hi,

This week I bought a used G5 PowerMac7,3 with 4 GB RAM and dual PowerPC 
970FX cpu's.  I didn't buy it because I miss the macppc all that much 
but because I want to test the water of creating a 64 bit port that goes 
onward to perhaps support IBM POWER5+ CPU's.  It seems Linux and FreeBSD 
are already there or on their way.

Since I'm a fan of OpenBSD I want an OpenBSD 64 bit Power(PC) port, and 
asking if anyone has experience to make this happen? What are hints that 
you can give?  Is it possible to just port over FreeBSD's low kernel 
routines and get OpenBSD/powerpc64 working that way?

My use of OpenBSD/powerpc goes back to 2.9/3.0 days (when the macppc 
port came), I had some time then and created some manpages for Dale Rahn 
for the macppc system (which are probably in the attic by now).  I love 
working with kernel code but I largely don't know what I'm doing.  My 
programming experience is limited, I program a DNS authoritative server.

At my last job I was an AIX sysadmin (in training) and worked on a POWER 
7 machine running AIX 7.2.  I left that job though so I can't use that 
hardware to test a 64 bit port.  It left an impression on me though.

Regards,

-peter