port-macppc/49907: ofwboot.xcf causes kernel panic in NetBSD 6.1.5

[deathbyfreezeray%hotmail.com@localhost]

>Number:         49907
>Category:       port-macppc
>Synopsis:       ofwboot.xcf causes kernel panic in NetBSD 6.1.5
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-macppc-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri May 15 22:25:00 +0000 2015
>Originator:     Raven King
>Release:        6.1.5
>Organization:
>Environment:
NetBSD DLS-103 6.1.5 NetBSD 6.1.5 (GENERIC) macppc
>Description:
When booting my 1.42 GHz mac mini G4 (stealth upgrade version) from the ofwboot.xcf file provided in either 6.1.5 macppc/installation in the ftp or the one provided with the newest autobuilds of -current I get a kernel panic in the bootloader that looks like this:

NetBSD/macppc OpenFirmware Boot, Revision 1.12
8038232+175536 [370048+369316]=0x887fe8
start=0x100000
No ADB support present, assuming USB keyboard
trap: kernel ISI by 0xff847288 (SRR1 0x40003030), Ir: 0x1001d0
panic: trap
Stopped

The machine will only boot properly if I use the ofwboot.xcf file from a NetBSD-5 based release.

It should be noted that this could be considered a duplicate of NetBSD Problem Report #44895. 
>How-To-Repeat:
Use a version of ofwboot.xcf newer than the one provided with NetBSD-5 based releases on a G4 mac mini.
>Fix:
A current workaround it to use the ofwboot.xcf file from a NetBSD-5 based release.