Prod kernel hangs on mac mini

I've tried a few things to get NetBSD going on my Mac Mini G4, but had 
some bad luck so far.

I managed to get 8.2 working on it, but it seems to be missing some 
stuff I need, e.g. no openssl in pkgsrc (blocks a lot of things,) no git ...

With 9.3, I run the installer mostly OK, but when it comes to booting 
the production kernel it panics.  ofwboot prints some messages, then the 
kernel boots and prints a couple of maybe normal lines about memory 
regions, then comes a "trap" in ISI...

Stuff scrolls past pretty quick, I get a bunch of "Faulted in DDB, 
continuing", and then stuff about  tracebacks and skipping crash dump on 
recursive panic scrolls repeatedly.


I'm wondering, since the installer kernel works OK, are there different 
kernel builds I can try?


Any help appreciated.

Thanks,
Alex