linux-kernel - Re: Bootup support for watchdog with short timeout (touch_nmi

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Date:	Mon, 29 Oct 2007 21:54:54 -0500
From:	Josh Boyer <jwboyer@...il.com>
To:	lsorense@...lub.uwaterloo.ca (Lennart Sorensen)
Cc:	Stefan Roese <stefan.roese@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: Bootup support for watchdog with short timeout
 (touch_nmi_watchdog()?)

On Mon, 29 Oct 2007 15:45:03 -0400
lsorense@...lub.uwaterloo.ca (Lennart Sorensen) wrote:

> On Mon, Oct 29, 2007 at 03:22:27PM +0100, Stefan Roese wrote:
> > I'm trying to implement support for a board specific watchdog on a PPC440EPx 
> > board with a very short timeout. In this case, the watchdog has to 
> > be "kicked" at least every 100ms, even while booting and the real watchdog 
> > driver not running yet. While looking for trigger places in the kernel 
> > source, I noticed the already existing "touch_nmi_watchdog()" function, which 
> > seems to be doing what I need. Even if the name not exactly matches my 
> > hardware setup.
> > 
> > My question now is, is it recommended to use this 
> > touch_nmi_watchdog() "infrastructure" for my PPC custom specific watchdog 
> > during bootup? And if yes, should it perhaps be renamed to a more generic 
> > name, like "touch_watchdog"?
> > 
> > Please advise. Thanks.
> 
> No idea really.  Who would design a watchdog with such a short trigger
> time?  That doesn't seem to be useful in any way.

To some degree, it's configurable.  But the generic question still
stands.  It seems like a decent idea to me.  Making touch_watchdog (or
whatever it winds up being called) nice across arches might be fun.

josh
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