I have put the ofwboot.xcf and netbsd.GENERIC_MD.gz files in
the root directory of an HFS+ partition (hd:12).

Booting from Open Firware fails with a Decrementer Exception.
Here is a transcript:

0 > dev /openprom  ok
0 > .properties
name			openprom
device_type		BootROM
model			OpenFirmware 3
relative-addressing
supports-bootinfo
boot-syntax		00000001

  ok
0 > boot hd:12,\ofwboot.xcf netbsd.GENERIC_MD.gz
load-size=e148 adler32=db640f80

loading XCOFF

tsize=cbc0 dsize=14a8 bsize=2670 entry=640000
SECTIONS:
.text   00640000 00640000 0000cbc0 000000e0
.data   0064d000 0064d000 000014a8 0000cca0
.bss    0064e4a8 0064e4a8 00002670 00000000
loading .text, done..
loading .data, done..
clearing .bss, done..

>> NetBSD/macppc OpenFirmware Boot, REvision 1.6
>> (autobuild@tgm.daemon.org, Sun Sep  8 21:53:46 UTC 2002)
5946708+219188=0x5e179c
 start=0x800000

Decrementer exception at   %SRR0: 000000ba   %SRR1: 0000ba00
 ok
0 >

Is my Powerbook simply unsupported for the moment, or is there
something I can do to fix this?

Thanks,

Neil.