From: "Pádraig Brady" <P@draigBrady.com>
To: Cypher Wu <cypher.w@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Questions about Watch Dog Timer under Linux.
Date: Wed, 09 Dec 2009 17:26:58 +0000 [thread overview]
Message-ID: <4B1FDDE2.1090507@draigBrady.com> (raw)
In-Reply-To: <f9f38a550912090647q5af6cb14w84ea8d9223d82bd9@mail.gmail.com>
On 09/12/09 14:47, Cypher Wu wrote:
> I'm used to work on embedded systems, the Watch Dog Timer in our
> products is usually a seperate chip on the board wich will start to
> work after power reset and will time out in 2 seconds. The system has
> to start dog clearing from the very beginning and there have no way to
> disable WDT.
wow 2 seconds :(
It's easy to patch grub stage 1 to pat the watchdog.
I was even able to get support for the complicated iTCO intel
watchdogs in there, though your watchdog may be much simpler.
Then when the kernel started it patted the watchdog as normal.
Note I did this to support robust remote upgrade (as the boot
loader wasn't touched on upgrade), rather than to support a
very short timeout.
cheers,
Pádraig.
next prev parent reply other threads:[~2009-12-09 17:27 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-09 14:47 Questions about Watch Dog Timer under Linux Cypher Wu
2009-12-09 14:59 ` Mark Brown
2009-12-11 8:27 ` Cypher Wu
2009-12-11 10:21 ` Mark Brown
2009-12-12 3:46 ` Cypher Wu
2009-12-12 13:50 ` Alan Cox
2009-12-09 16:29 ` Alan Cox
2009-12-11 8:33 ` Cypher Wu
2009-12-09 17:26 ` Pádraig Brady [this message]
2009-12-11 8:38 ` Cypher Wu
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