> From: Dale Ghent <da...@elemental.org>
> Date: Wed, 30 Dec 2015 15:34:14 -0500
> 
> I managed to get a slow-motion video of the console and transcribe
> the first several lines of CPU setup and probing from a verbose
> boot. It seems that the kernel isn't finding a lot of stuff here.
> 
> >>> bios probe won
> bios0 at mainbus0: SMBIUOS rev. 2.8 @ 0xed8b0 (55 entries)
> bios0: vendor American Megatrends Inc. version "1.0b" date 09/09/2015
> bios0: Supermicro X10SDV-8C-TLN4F
> >>> probing for mpbios0
> >>> mpbios probe returned 0
> >>> probing for acpi0
> >>> acpi probe returned 1
> >>> acpi probe won
> acpi0 at bios0: rev 2
> acpi0: tables DSDT FACP APIC FPDT FIDT SPMI NCFG UEFI HPET WDDT SSDT BGRT 
> SSDT PRAD SMAR HEST BERT ERST EINJ
> >>> probing for acpiec*
> >>> acpiec probe returned 0
> >>> probing for acpimadt0
> >>> acpimadt probe returned 0
> >>> probing for acpiprt*
> >>> acpiprt returned 0
> >>> no winning probe
> >>> probing for acpiec*
> >>> acpiec probe returned 0
> >>> probing for acpimadt0
> >>> acpimadt probe returned 0
> >>> probing for acpiprt*
> >>> acpiprt returned 0
> >>> no winning probe
> >>> probing for acpiec*
> >>> acpiec probe returned 0
> >>> probing for acpimadt0
> >>> acpimadt probe returned 0
> >>> probing for acpiprt*
> >>> acpiprt returned 0
> >>> acpimadt0 probe won
> acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
> >>> probing for cpu0
> >>> cpu probe returned 1
> >>> probing for ioapic*
> >>> ioapic probe returned 0
> >>> probing for efifb0
> >>> efifb probe returned 0
> >>> probing for pci*
> >>> pci probe returned 0
> >>> probing for isa0
> >>> isa probe returned 0
> >>> cpu probe won
> cpu0 at mainbus0: apid 0 (application processor)
> cpu0: not started

Ok, that's not good.  Typically cpu0 is the boot processor and not an
application processor.  And our kernel code might rely on that.

As a workaround, you could try enabling only a single core in the
BIOS.  The user manual for these SuperMicro machines seems to suggest
that would be possible.

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