linux-kernel - Re: Questions about Watch Dog Timer under Linux.

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Message-ID: <20091211102159.GB18825@rakim.wolfsonmicro.main>
Date:	Fri, 11 Dec 2009 10:21:59 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Cypher Wu <cypher.w@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Questions about Watch Dog Timer under Linux.

On Fri, Dec 11, 2009 at 04:27:55PM +0800, Cypher Wu wrote:

Please reply in-line to e-mails, it makes the conversation much easier
to follow.

> It seems WATCHDOG_NOWAYOUT is a software mechanism? If it is defined
> as 1 then the WDT can't be stopped if it has been started whether bye
> closing the device file or writing the magic character 'V'.

Yes, it's a kernel build time configurable option to select this
behaviour.  In effect all you'd be doing is making a driver which turns
it on all the time.
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