[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 #52 from commit-hook at freebsd.org ---
A commit references this bug:

Author: jhibbits
Date: Fri May 24 01:51:58 UTC 2019
New revision: 348218
URL: https://svnweb.freebsd.org/changeset/base/348218

Log:
  MFC r347463:

  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

Changes:
_U  stable/12/
  stable/12/sys/powerpc/aim/mp_cpudep.c

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