[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 #6 from John Baldwin <jhb at FreeBSD.org> ---
Comment on attachment 151604
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=151604
Bootup with printf enabled

So it looks like it hung trying to start up the second AP?  Normally though we
have a timeout here that fails and prints a message (and offers to panic :-/)
if the AP doesn't respond in time.  In the past when I've seen similar issues
they have either been due to SMI# interference (we disable legacy USB mode on
certain Macs early in the boot process to workaround similar issues) or they
were resolved via a BIOS update.  Is this a new Intel platform?

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