From owner-freebsd-stable@FreeBSD.ORG  Sat Mar 10 16:39:56 2007
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Date: Sat, 10 Mar 2007 11:35:51 -0500
From: Yoshihiro Ota <ota@j.email.ne.jp>
To: Danny Braniss <danny@cs.huji.ac.il>
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Cc: freebsd-stable@freebsd.org, Ivan Voras <ivoras@fer.hr>
Subject: Re: Migrating from x86 (32) to amd64
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On Sat, 10 Mar 2007 13:57:09 +0200
Danny Braniss <danny@cs.huji.ac.il> wrote:

> > Yoshihiro Ota wrote:
> > > About one year ago, I was able to do the regular procedure after enabling i386 compat.
> > > It was just another make world for me.
> > >
> > > options         COMPAT_IA32
> > >
> > > What I mean is:
> > >
> > > #  1.  `cd /usr/src'       (or to the directory containing your source tree).
> > > #  2.  `make buildworld'
> > > #  3.  `make buildkernel KERNCONF=3DYOUR_KERNEL_HERE'     (default is GENERIC).
> > 
> > But if you already have an i386 kernel running, wouldn't running "make
> > buildkernel" just make another i386 kernel?
> 
> try
> 	make buildkernel TARGET_ARCH=amd64 KERNCONF=YOUR_KERNEL_HERE
> 
> works for me,
> 	danny
> 

I believe I have done with TARGET_ARCH=amd64 or something on the line.  As I've done it about a year ago, I don't recall some of these details.

After a couple of months, I decided to switch back to i386.  It was just to experiment amd64.  I share the same executables among multiple systems (although there are only 2 or 3) to sync software versions. (It is not often but having diffrent versions of the same software causes some problems.)  Since I have i386 machines, I cannot share amd64 binraries.