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

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Message-ID: <20091212135035.0d01018d@lxorguk.ukuu.org.uk>
Date:	Sat, 12 Dec 2009 13:50:35 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Cypher Wu <cypher.w@...il.com>
Cc:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Questions about Watch Dog Timer under Linux.

> timer. This type of WDT is widely used in our embedded systems and we
> usually install a callback in timer interrupt to clearing WD before
> BSP starting the RTOS kernel, and then starting a task to clear WD and
> uninstall the callback.
> I'm wonder when cope with that type of WD, is there any framework
> already in the Linux kernel and booter, or I've to modify them by
> myself?

Without knowing which boot environment you are using I don't know. For
the kernel itself you may need to touch the timer early on in boot (in
your platform setup code), then set up the driver early on.

There isn't a general framework for this although there may be one I
don't know about implemented in some other specific platform.

Alan
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