port-macppc/59550: Power Mac G5 boot regression

[gson%gson.org@localhost (Andreas Gustafsson)]

>Number:         59550
>Category:       port-macppc
>Synopsis:       Power Mac G5 boot regression
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    port-macppc-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Jul 24 16:55:01 +0000 2025
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current
>Organization:
  
>Environment:
System: NetBSD
Architecture: powerpc
Machine: macppc
>Description:

The modified POWERMAC_G5 kernel I recently managed to boot on a Power
Mac G5 as described in PR 59529 no longer boots since this commit:

  2025.07.20.09.41.19 martin src/sys/arch/macppc/conf/GENERIC 1.383

  Enable PAX_ASLR

The last output from OFW is:

  loading .data, done..
  clearing .bss, done..

  Invalid memory access at    $SRR0:  00000000.00e00384      $SRR1:  10000000.00003030
   ok
  0 >

where the "$" is actually a character I don't recognize.

This is booting from a CD containing ofwboot.xcf and the kernel, both
built from the same -current sources.  Since the error happens so
early, I suspect this is a problem with ofwboot.xcf rather than the
kernel.

Reverting the commit makes the boot work again.

>How-To-Repeat:

>Fix: