[Bug 233863] Various PowerMac G5 models 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 #37 from [email protected] ---
A commit references this bug:

Author: jhibbits
Date: Fri May 10 19:36:15 UTC 2019
New revision: 347463
URL: https://svnweb.freebsd.org/changeset/base/347463

Log:
  powerpc: Initialize the Hardware Interrupt Offset Register (HIOR) earlier for
ppc970

  Since we now have a much larger KVA on powerpc64, it's possible to get SLB
  traps earlier in boot, possibly even before the HIOR is properly configured
  for us.  Move the HIOR setup to immediately after reset, so that we use our
  exception handlers instead of Open Firmware's.

  PR:           233863
  Submitted by: Mark Millard (partial)
  Reported by:  Mark Millard
  MFC after:    2 weeks

Changes:
  head/sys/powerpc/aim/mp_cpudep.c

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