port-macppc/45984: Recent HEAD (5.99.64) macppc kernels cannot boot

[dhgutteridge%sympatico.ca@localhost]

>Number:         45984
>Category:       port-macppc
>Synopsis:       Recent HEAD (5.99.64) macppc kernels cannot boot
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    port-macppc-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Feb 11 18:25:00 +0000 2012
>Originator:     David H. Gutteridge
>Release:        5.99.64/macppc
>Organization:
>Environment:
>Description:
I'm no longer able to boot NetBSD kernels on my old iBook SE laptop.
I upgraded the ofwboot.xcf to what's packaged with the latest 5.99.64
build, then tried to boot the GENERIC and INSTALL kernels.  Instead
of a successful boot, I get this error message:

DEFAULT CATCH!, code=400 at     %SRR0:  001001b0     %SRR1:  40003030

Here's what works:

Old ofwboot.xcf from the NetBSD-4 branch + NetBSD-4 branch kernel
New ofwboot.xcf from 5.99.64 + NetBSD-4 branch kernel

Here's what doesn't work:

Old ofwboot.xcf from the NetBSD-4 branch + 5.99.64 kernel
New ofwboot.xcf from 5.99.64 + 5.99.64 GENERIC kernel
New ofwboot.xcf from 5.99.64 + 5.99.64 INSTALL kernel

(Note this is distinct from PR 44895, in which a new ofwboot.xcf
cannot boot a kernel.  I have no troubles with the new ofwboot.xcf,
it's the kernels that are triggering the error.)

>How-To-Repeat:
As above, try booting a new kernel.
>Fix: