[Bug 231967] [PowerPC64] Rebooting results in a hang after an OPAL command issued

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231967

            Bug ID: 231967
           Summary: [PowerPC64] Rebooting results in a hang after an OPAL
                    command issued
           Product: Base System
           Version: CURRENT
          Hardware: powerpc
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: sbruno at FreeBSD.org

When rebooting the power8 machines (pylon and archon), the host will fully
shutdown and hang after issuing the OPAL reboot command.

I can see similar behavior from the debugger when I try to reset the host as
well.  I'm trying to update petitboot on these machines to see if that's a
cause, but they are resisting.

root at pylon.nyi:~ # reboot
Oct  3 14:50:58 pylon reboot[9337]: rebooted by root
Oct  3 14:50:58 pylon syslogd: exiting on signal 15
Waiting (max 60 seconds) for system process `vnlru' to stop... done
Waiting (max 60 seconds) for system process `syncer' to stop... 
Syncing disks, vnodes remaining... 0 0 0 0 0 0 0 0 done
Waiting (max 60 seconds) for system thread `bufdaemon' to stop... done
Waiting (max 60 seconds) for system thread `bufspacedaemon-0' to stop... done
Waiting (max 60 seconds) for system thread `bufspacedaemon-1' to stop... done
Waiting (max 60 seconds) for system thread `bufspacedaemon-2' to stop... done
Waiting (max 60 seconds) for system thread `bufspacedaemon-3' to stop... done
Waiting (max 60 seconds) for system thread `bufspacedaemon-4' to stop... done
Waiting (max 60 seconds) for system thread `bufspacedaemon-5' to stop... done
Waiting (max 60 seconds) for system thread `bufspacedaemon-6' to stop... done
All buffers synced.
Uptime: 5m1s
[288855839410,5] OPAL: Reboot request...

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