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Date: Wed, 7 Nov 2007 15:12:12 -0600 (CST)
From: Mark Tinguely <tinguely@casselton.net>
Message-Id: <200711072112.lA7LCCJi041692@casselton.net>
To: rpaulo@freebsd.org, sobomax@freebsd.org
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Cc: rink@freebsd.org, freebsd-current@freebsd.org, freebsd-i386@freebsd.org,
	freebsd-hardware@freebsd.org
Subject: Re: MacBook users: possible fix for the SMP problem
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>  I don't really like the fact that it has to be turned on manually. Is it 
>  possible to make this automatic based on BIOS Id or something like this?
>
>  -Maxim

(Thread summary because of text removal - "On some systems, namely MacBooks
 we need to disallow the legacy USB circuit to generate an SMI# because this
 can  cause several problems, namely: incorrect CPU frequency detection and
 failure to start the APs." - taken from patch explaination).

This sounds like a great compiler option / C code definition. It can be
compiled into kernel and left as the default if you need it. It should
not go into GENERIC.

--Mark Tinguely.