[Bug 235060] [boot] FreeBSD 12.0 Release DVD and CD will not boot on PowerMac G5 Quad

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235060

Justin Hibbits <jhibbits at FreeBSD.org> changed:

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                 CC|                            |jhibbits at FreeBSD.org

--- Comment #21 from Justin Hibbits <jhibbits at FreeBSD.org> ---
Hi Curtis.  It's been reported that less memory actually makes the PowerMac G5
boot correctly.  I'm trying to understand why Mark's SLB hack is necessary,
since it should logically be necessary on any other AIM-architecture platform,
including my POWER9, so I'm really confused.  Unfortunately, my G5 no longer
works, and actually died shortly before I committed the change that reportedly
broke G5s.  I was/still am hoping that someone could go beyond Mark's diving,
and determine just why the APs can't handle SLB faults at that point in the
boot process, because they really should be able to.

kern.smp.disabled=1 should make any G5 boot correctly, but then you're
obviously stuck with only a single CPU.

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