[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 #15 from Mark Millard <markmi at dsl-only.net> ---
(In reply to Justin Hibbits from comment #11)

Context: PowerMac G5 so-called "Quad Core",
full 16 GByte of RAM.
(Not the most interesting but the only powerpc64
context I currently have access to.)

I've had no problems with the classic boot
hangups and crashes since I switched to your
code (replacing my hack).

That even includes during the kernel version
bisection effort that eventually found recent
locking changes in the kernel (after -r313266)
lead to randomly occurring panics and hangups
after booting.

It is still unknown when I'll again get access
to the other, older type of PowerMac G5 (a
dual processor, single core per processor
G5).

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