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From: John Baldwin <jhb@freebsd.org>
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Date: Tue, 10 Apr 2007 12:48:25 -0400
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Cc: Darren Pilgrim <phi@evilphi.com>,
	Dag-Erling =?iso-8859-1?q?Sm=F8rgrav?= <des@des.no>
Subject: Re: what can i do with a 486?
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On Friday 06 April 2007 14:54, Dag-Erling Sm=F8rgrav wrote:
> Darren Pilgrim <phi@evilphi.com> writes:
> > Dag-Erling Sm=F8rgrav wrote:
> > > Darren Pilgrim <phi@evilphi.com> writes:
> > > > Well for one you should probably not try to boot an i686 kernel
> > > > on a 486....
> > > It's not an i686 kernel.  It's an i486 kernel with code to
> > > recognize and support i586 and i686 CPUs.
> > Technically it's neither.  It's an i386 kernel with support for
> > 486-, 586- and 686-class CPUs.
>=20
> No.  It won't run on an i386.  Atomic operations are ridiculously
> inefficient on the i386 (no cmpxchg), so we don't use i386-compatible
> code unless I386_CPU was specified.

And support for I386_CPU was removed in 6.0.

=2D-=20
John Baldwin