[Bug 284275] Jingsha B85M-I: System hangs on boot unless kern.smp.disabled=1

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=284275

            Bug ID: 284275
           Summary: Jingsha B85M-I: System hangs on boot unless
                    kern.smp.disabled=1
           Product: Base System
           Version: 14.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: k4sum1@eclipse.cx

Created attachment 256916
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=256916&action=edit
Boot screen at freeze without kernel panic

System is a custom built PC with a Jingsha B85M-I mainboard and an i5 4570T
CPU. Booting in CSM/Legacy/MBR mode will result in the system hanging at boot.
UEFI mode is significantly more reliable, booting more often, but it still,
albeit rarely, can freeze at the same spot. (I've only seen this twice with
UEFI boot) Sometimes I get a kernel panic, but most of the time it just hangs
there. If I set kern.smp.disabled=1 the system boots up just fine.

The system just reboots if I boot without ACPI, the first few times it then
successfully booted without any changes, but I haven't been able to replicate
it again. Only one time booting without ACPI I got a kernel panic of "running
without device atpic requires a local APIC"

If I reset the system instead of powering off then back on after a failed boot,
it will sometimes successfully boot, however I haven't been able to replicate
that the past few times.

I've tested stock FreeBSD 14.2 and 13.3 (XigmaNAS 13.3.0.5), both have the same
issue and the fix is the same for both.

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