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Subject: [Bug 196542] System stops booting with "ACPI APIC Table: <INTEL 
 DENLOW>"
Date: Mon, 26 Jan 2015 15:59:09 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196542

--- Comment #11 from John Baldwin <jhb@FreeBSD.org> ---
I assume you've let it sit for more than 5 seconds?  Normally if trying to
start an AP times out, it panics after waiting about 5 seconds.  I'm puzzled
that it is hanging forever without panic'ing.  The reason to test with legacy
USB disabled is to try to narrow down a possible cause (similar to HTT) btw.

If you are up for one more test, can you also instrument the "start_ap"
function to verify that it at least gets into the spin loop and is spinning
when it dies?  (Maybe print out something periodically in the wait loop, could
start with once a second, but if that doesn't output you could make it print
more often to see if it is looping at all, or if it is hanging in the DELAY()
call)

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