[Bug 233863] Various PowerMac G5 models may require kern.smp.disabled=1 and must set usefdt=1 which causes net interface reorder

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233863

--- Comment #44 from Mark Millard <marklmi26-fbsd at yahoo.com> ---
Another solid powerpc64 FreeBSD incompatibility for
the PowerMac G5's is the following, not directly
addressed by any of the attachments, but a working
and in-use usefdt mode does avoid the problem. (So
it is indirectly addressed to some extent.)

When the "direct map" to high memory addresses, parts
of openfimware and FreeBSD became solidly, reliably
incompatible, leading to reproducible crashes.

Unless you want the powerpc64 FreeBSD to crash, one
thing to avoid is significant use of openfirmware,
such as via use of ofwdump, say ofwdump -ap > /dev/null .

When I wanted to use ofwdump, I booted 32-bit powerpc
FreeBSD on the G5 instead and use ofwdump from there.
(This was before I could put usefdt mode to use. Now
I've two types of contexts from which I can run ofwdump
without crashing.)

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