[Bug 196542] System stops booting with "ACPI APIC Table: <INTEL DENLOW>"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196542

--- Comment #14 from John Baldwin <jhb at FreeBSD.org> ---
(In reply to Jonas Keidel from comment #12)

To be clear, does the machine hang at the image you provided?  If so, it
appears to be hung in ipi_startup?

Can you instrument ipi_startup?  The calls in there to lapic_ipi_wait(-1) can
potentially hang forever.  One thing you can do is to change the '-1's to
1000000 and seeing if the machine boots.  It seems that Linux does this (it
just gives up waiting if the ICR bit doesn't clear).

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