RE: Problems restarting after watchdog

["Paul Chernett" <paul dot chernett at grandeye dot com>]

The problem turns out to be that the IXP425 doesn't have an external reset
pin so external devices - especially flash aren't reset when the watchdog
fires leading to the situation you describe.

Our solution will be to use an external watchdog device.

Thanks.


> -----Original Message-----
> From: Andrew Lunn [mailto:andrew@lunn.ch]
> Sent: 22 December 2004 08:29
> To: Paul Chernett
> Cc: ecos-devel@sources.redhat.com
> Subject: Re: Problems restarting after watchdog
>
>
> On Wed, Dec 22, 2004 at 07:51:27AM -0000, Paul Chernett wrote:
> > Hi,
> > 	we're running linux from RedBoot on an Intel IXP425 board. When the
> > watchdog in the IXP425 fires RedBoot often fails to start up and restart
> > Linux - everything just hangs.
>
> I've had a similar problem on another target. Sometimes after a
> watchdog reset the board did not boot. This turned out to be a
> hardware design error. The flash devices were not getting reset. This
> meant if a flash erase/program was going on when the watchdog went
> off, the flash remained unaccessable and the device could not boot.
>
> The same could be happening with your system. Some device is not
> getting reset back to power on state causing the system to not boot
> correctly.
>
>         Andrew
>