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Date: Wed, 12 Apr 2006 11:48:50 +0200
From: Bastos Fernandez Alexandre <ALEBAS@televes.com>
To: linuxppc-embedded list <linuxppc-embedded@ozlabs.org>
Subject: Watchdog on MPC82xx
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Hi list,

I am trying to use the on-chip watchdog timer in the MPC8248 to
recover from system hangs.

I have been following the guidelines from the changes I have found
from Compulab.

In u-boot, the watchdog is activated and works fine. The changes in
the kernel are, basically, assigning the ppd_md.heartbeat to a function
which resets the watchdog. This is supposed to start reseting the wdt
after ppc_md.setup_arch is invoked, but this is not working, and the
kernel keeps rebooting during startup.

I have tried to catch the point when this happens to force a WD service
sequence before that, but I had no success.

So, can anyone give me some guidelines for this job? I have seen from
freescale docs that MPC83xx watchdog may be the same than MPC82xx one.
So, could I use the same approach than used on MPC83xx boards?

http://patchwork.ozlabs.org/linuxppc//patch?id=4118


Thanks in advance

Alex