From owner-freebsd-current@FreeBSD.ORG  Thu Jul 21 04:51:34 2005
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From: Thierry Herbelot <thierry@herbelot.com>
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Date: Thu, 21 Jul 2005 06:51:09 +0200
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Subject: Re: Two FreeBSD slices, 32bit and 64bit
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Le Thursday 21 July 2005 00:55, Mark Daniel Reidel a écrit :
> Hello,
>
> I bought an athlon64 processor recently and everything went just fine
> using my old installation of FreeBSD in 32bit mode.
> Then I decided to give amd64 a try, deleted some unneeded linux-slices
> and created a new FreeBSD slice with a single partition. The current
> layout looks like this:
>
>      Device Boot    Start       End    Blocks   Id  System
> /dev/ad2s1   *         1         7     56196    6  FAT16
> /dev/ad2s2             8        20    104422+  83  Linux
> /dev/ad2s3            21      3668  29302560   a5  FreeBSD
> /dev/ad2s4          3669     14593  87755062+   5  Extended
> /dev/ad2s5          3669      9812  49351648+  a5  FreeBSD
> /dev/ad2s6          9813     14592  38395318+   7  HPFS/NTFS
>

Hello,

I don't think booting FreeBSD from an /extended/ partition is really 
supported : FreeBSD must boot from a primary partition.

You could create more partitions in ad2s3 (ad2s3d, for example) and install 
64-bit FreeBSD in ad2s3d, then use grub to select the FreeBSD version :

title  FreeBSD 32bits
  root   (hd1,2,a)
  kernel /boot/loader
title  FreeBSD 64bits
  root   (hd1,2,d)
  kernel /boot/loader

Just use the tools are they are meant to be ;-)

	Cheers

	TfH

PS : this post does not really belong in -current - you may have better luck 
on -questions.