From owner-freebsd-questions  Thu May 13 16: 2:32 1999
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Date: Thu, 13 May 1999 17:59:45 -0500 (CDT)
From: Gurudatt Shenoy <gurudatt@cs.tamu.edu>
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To: James Kalmadge <kalmadg@banet.net>
Cc: Alfred Perlstein <bright@rush.net>, freebsd-questions@freebsd.org
Subject: Re: 486 kernel works for 586?
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Actually, I was asking if I could compile for "I486 _CPU" and then run
this kernel on a Pentium Class CPU (backward compatible?)

But someone pointed out that this is not possible...


On Tue, 11 May 1999, James Kalmadge wrote:

> 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
> >
> > To Unsubscribe: send mail to majordomo@FreeBSD.org
> > with "unsubscribe freebsd-questions" in the body of the message
> 
> 




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