[Bug 233863] r345425 on PowerMac G5 may require kern.smp.disabled=1 and must set usefdt=1 which causes net interface reorder

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

--- Comment #24 from Mark Millard <[email protected]> ---
I did some experimenting on a 1 GiByte iMac G3 with
the SSD that I've been using for the 32-bit powerpc
FreeBSD testing with these patches.

For non-usefdt mode, it seemed to boot and operate
okay for the little bit I did with the iMac G3.

But for usefdt mode, towards the end of booting or
not all that long after logging in, it crashed. The
details were not stable for where or the type of
panic.

What was sort of consistent was moea_* involvement,
despite just-what varying:

moea_pvo_find_va (via moea_is_prefaultable)
moea_pvo_to_pte
moea_pvo_enter

Unfortunately, I happened to have a non-debug kernel
context at the time. If I try again, it will be with
a debug kernel. The swap/page space was rather large
for the RAM. I could try with no swap enabled.

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