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Date:      Tue, 11 May 1999 22:04:51 -0400
From:      James Kalmadge <kalmadg@banet.net>
To:        Alfred Perlstein <bright@rush.net>
Cc:        Gurudatt Shenoy <gurudatt@cs.tamu.edu>, freebsd-questions@FreeBSD.ORG
Subject:   Re: 486 kernel works for 586?
Message-ID:  <3738E1C2.E088A614@banet.net>
References:  <Pine.BSF.3.96.990511123644.24802b-100000@cygnus.rush.net>

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To clarify:  I guess you are saying that  if you compile for multiple
CPU types  you're all set.  Yes?
As per:

cpu        "I486_CPU"
cpu             "I586_CPU"
cpu             "I686_CPU"

in the conf file.

Alfred Perlstein wrote:

> On Tue, 11 May 1999, Gurudatt Shenoy wrote:
>
> >
> > Hello,
> > I compiled the FreeBSD 2.2.1 kernel on a Pentium class CPU with the CPU
> > type set to "I486_CPU". However, when I boot the machine and try to use
> > this kernel, I get "CPU class unknown" error.
> > Won't a 486 kernel work on a "586" type CPU?
> >
> > I'd appreciate any feedback. Please reply to my email address - I am not
> > on the FreeBSD list.
> >
>
> MUST have the CPU type that you are going to use compiled in, there
> is no "forward/backward compatibility" it just must have that type of
> CPU compiled in.
>
> -Alfred
>
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