[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 #38 from Mark Millard <[email protected]> ---
Comment on attachment 204307
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=204307
Patch for aim/mp_cpudep.c that fixes slb-miss problem in cpudep_ap_bootstrap
for PPC970/PowerMacG5 contexts

While I have no clue why Justin H. thinks that later-is-better
for most of the code that I moved in my latest aim/mp_cpudep.c
patch, Justin has checked in -r347463 with just the HIOR part
moved:

                /* Set HIOR to 0 */
                __asm __volatile("mtspr 311,%0" :: "r"(0));
                powerpc_sync();

This certainly has allowed booting in my testing of a
-r347463 build.

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