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From: Vivek Khera <vivek@khera.org>
Date: Tue, 14 Mar 2006 10:07:42 -0500
To: Pete French <petefrench@ticketswitch.com>
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Cc: freebsd-stable@freebsd.org
Subject: Re: Cannot boot 6.1-PRERELEASE in SMP mode
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On Mar 14, 2006, at 7:41 AM, Pete French wrote:

> But FreeBSD will not boot SMP with the second processor installed.  
> It behaves
> exactly as it did with a single processor and ACPI enabled - i.e.  
> it stops
> at the 'Waiting for SCSI devices to settle" point and does not get  
> beyond
> this.

when you boot, at the FreeBSD menu, break to the command prompt and  
type this:

debug.acpi.disabled=timer
boot

and see if it works.  I have one system on which 5.4 works  
flawlessly, but anything from 6.0-REL and up requires I disable the  
ACPI timer.

If it works, just add the above line to your /boot/loader.conf file  
to make it stick across reboots.