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Date:      Wed, 18 Aug 1999 16:24:38 -0700
From:      Ludwig Pummer <ludwigp@bigfoot.com>
To:        "Paul T. Root" <proot@iaces.com>
Cc:        jason@townnews.com (Jason), freebsd-questions@FreeBSD.ORG
Subject:   Re: CPU Upgrade
Message-ID:  <4.2.0.58.19990818161356.00be2650@toy>
In-Reply-To: <199908181735.MAA00584@iaces.com>
References:  <37BAE53F.616CD4F7@townnews.com>

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At 12:35 PM 8/18/1999 -0500, Paul T. Root wrote:
>In a previous message, Jason said:
> > We're running FreeBSD 2.2.5-Stable on a slower system, and we'd like to
> > upgrade the processor in the machine. WIll we need to recompile the
> > kernel if we perform this upgrade? If so, I'd appreciate the details on
> > why (I'm a curious sort when it comes to things like this). I can't seem
> > to find any solid information on the subject...
>
>You won't need to if you aren't changing processor types.

I feel like extending his answer a bit.

If you _are_ changing processor types (like from a 486/Cyrix MediaGX to a 
Pentium/K6/K6-2/Cyrix, or a Pentium/K6/K6-2 to a Pentium II/Pentium 
III/Xeon), then you need to make sure you have one of the lines:
cpu     "I586_CPU"
cpu     "I686_CPU"

You could just recompile a kernel with both of those lines (and a line for 
a 486, if that's what you have now). It doesn't hurt to have the lines and 
not have the CPU (except maybe that the kernel eats up a bit more disk and 
RAM). But if you don't have the proper cpu line, then your kernel won't boot.

--Ludwig Pummer <ludwigp@bigfoot.com>


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