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From: eculp@unixmania.com
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Subject: Re: Upgrading from an old athlon to a new 64 bit one.
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Quoting RW <fbsd06@mlists.homeunix.com>:

> On Thu, 28 Jun 2007 10:12:39 -0500
> eculp@unixmania.com wrote:
>
>
>> What I am trying to do is compile an amd64 kernel, install it and
>> see what happens ;) I can always go back to the generic kernel
>> compiled in sys/i386.
>
> amd64 and i386 are different platforms in the same sense that sparc64
> and ppc are different platforms. An AMD 64 is not back-compatible to
> pentium pro code  when it's in 64-bit mode. Whilst 32-bit binaries can
> be run on the amd64 platform, they need special handling, you can't
> just mix-and-match world and kernel platforms.

Thanks, RW.  I had assumed that and had hoped to run my make  
buildworld, make buildkernel, mergemaster, make installkernel and make  
installworld then upgrade all ports.

The problem is that I haven't been able to figure out, how to build  
using all amd64.

Again very dumb on my part, I'm sure.

ed