From owner-freebsd-hackers  Mon Mar 15 11: 8:34 1999
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From: Søren Schmidt <sos@freebsd.dk>
Message-Id: <199903151907.UAA21303@freebsd.dk>
Subject: Re: power-off without halt
In-Reply-To: <199903151655.JAA28147@Ilsa.StevesCafe.com> from Steve Passe at "Mar 15, 1999  9:55:54 am"
To: smp@csn.net (Steve Passe)
Date: Mon, 15 Mar 1999 20:07:59 +0100 (CET)
Cc: hackers@FreeBSD.ORG
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It seems Steve Passe wrote:
> Hi,
> 
>  We are looking at using FreeBSD as an "embedded OS" inside a line
> of instruments we are building.  I think I have a handle on all the
> issues except how to cleanly handle shutdown where there is no
> console, and thus no way to send a 'halt' command.  The requirement
> is that the user can merely turn off the power, nothing more required.
> 
>  I can modify the disk setup, kernel/util code as needed, I just need some
> idea for a workable solution.  Has anyone delt with this problem before?

Use a small circuit that gets the power off switch signal, pulls NMI
which shutdown the system, and after a sufficient timemout pulls
the power..
Nice and easy, and if the system hangs it will just be shut off after
the timeout....

KISS at work again :)

-Søren


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