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Date:      Wed, 07 Feb 2001 11:00:11 -0800
From:      Kris Kennaway <kris@obsecurity.org>
To:        Matthew Koivisto <mkoivist@nortelnetworks.com>
Cc:        "'freebsd-questions@freebsd.org'" <freebsd-questions@freebsd.org>
Subject:   Re: Multiple kernels
Message-ID:  <20010207110010.A29705@mollari.cthul.hu>
In-Reply-To: <E1A4B2CC91EBD1118A510000F80836F803ECAB0C@zwdld002.ca.nortel.com>; from mkoivist@nortelnetworks.com on Wed, Feb 07, 2001 at 01:32:07PM -0500
References:  <E1A4B2CC91EBD1118A510000F80836F803ECAB0C@zwdld002.ca.nortel.com>

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On Wed, Feb 07, 2001 at 01:32:07PM -0500, Matthew Koivisto wrote:
> Hi, I'm fairly new to freeBSD and I'm currently running a system with
> freeBSD 4.1 - RELEASE. I would like to upgrade to freeBSD 4.2 - RELEASE but
> I would also like to keep my old 4.1 kernel around. Is it possible to use
> the kernel boot loader to run different kernel versions like this? Or is the
> kernel boot loader just for loading kernels built with different options and
> not versions?

You can do it - see the loader manual page - but running kernels with
a different version than your userland code (even built from -STABLE
sources checked out on different days) is not supported and will break
things.

Kris

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