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Date:      Fri, 5 Feb 1999 00:32:24 +0200 (SAT)
From:      Robert Nordier <rnordier@nordier.com>
To:        jonny@jonny.eng.br (Joao Carlos Mendes Luis)
Cc:        mike@smith.net.au, current@FreeBSD.ORG
Subject:   Re: Overview of the FreeBSD boot process, 3.1 and later
Message-ID:  <199902042232.AAA29549@ceia.nordier.com>
In-Reply-To: <199902042147.TAA21532@roma.coe.ufrj.br> from Joao Carlos Mendes Luis at "Feb 4, 99 07:47:46 pm"

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Joao Carlos Mendes Luis wrote:

> 1) Explain a bit more how boot0 works, and which consequences could
> this behavior have on another operating systems installed.  For
> example, say that it remembers the last booted slice by rewriting
> itself.  BTW: Can this be disabled ?  Sometimes this is not
> needed/wanted, and the only current solution is to use os-bs.

I think the best place to deal in detail with boot0 would be in a
boot0(8) man page, similar in approach to the present boot(8).
I'll try to get around to this in the next few days.

It's useful that Mike's document touches on boot[012], but the
loader is a big subject in it's own right -- and the one most people
will want to read up on -- whereas boot0 is not even FreeBSD-specific,
beyond being included in the distribution.

To answer your question: yes, updates can be disabled.  The easiest
method at present is to define B0FLAGS (in the Makefile) as having
bit 6 (0x40) set.  Though a utility for installing and configuring
the boot manager from the command line is in progress.

--
Robert Nordier

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