[Bug 205458] 11.0-CURRENT/10-STABLE powerpc64: a PowerMac G5 specific sys/powerpc/ofw/ofw_machdep.c change for reliable PowerMac G5 booting (with lots of RAM)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205458

--- Comment #20 from Mark Millard <markmi at dsl-only.net> ---
(In reply to Justin Hibbits from comment #19)

It turns out that if TARGET_ARCH=powerpc is
to work on powerpc64 PowerMac's reliably then
it needs to detect the context and also avoid
the sprg0 update.

It turns out that the problems and evidence
that I've been reporting are from the code
restoring the openfirmware sprg0 lile the
TARGET_ARCH=powerpc64 code used to do.

I'll submit a separate, new report. But I
figured the relationship would be good to
note here.

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