[Bug 233863] r345425 on PowerMac G5 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 #19 from Mark Millard <marklmi26-fbsd at yahoo.com> ---
Created attachment 203844
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=203844&action=edit
Investigatory patch for sys/powerpc/aim/mmu_oea64.c

I had forgotten my old 2019-Jan-29/30 reports and patch tied
to a debug-build KASSERT failure on a old PowerMac.

See: https://lists.freebsd.org/pipermail/freebsd-ppc/2019-January/010020.html

(the Jan-30 udpate).

It was tied to activity like:

unload
load /boot/kernel/kernel
boot

or:

unload
boot -v /boot/kernel/kernel

for seeing the specific KASSERT examples that I got.

That justified looking into the code, but looking seemed
to indicate the more general problems noted on the list.
I'll not repeat the material here.

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