[U-Boot-Users] Enabling watchdog for MPC850

[Shlomo_Kut at mksinst.com]

Hi,

I enabled the watchdog both in u-boot and in Linux and it worked fine. 
Linux rebooted itself  after printing a warning message on the console. 
Thanks.

One thing I don't understand form the watchdog driver documentation.

>In open-only mode, the watchdog will not expire if the device file is not 
opened by any process, while in
>always mode the behavior is independent of the device file being opened.

How can you set open only mode without opening /dev/watchdog?

Could anybody direct me to an example of a simple watchdog application 
using the regular API?

regards

Shlomo Kut

Software Engineer
MKS Instruments
Tenta Products
Tel: 972-8-9181015
Fax: 972-8-9181020
www.mksinst.com





Wolfgang Denk <wd at denx.de>
Sent by: wd at denx.de
03/03/2004 01:54 AM

 
        To:        Shlomo_Kut at mksinst.com
        cc:        u-boot-users at lists.sourceforge.net
        Subject:        Re: [U-Boot-Users] Enabling watchdog for MPC850


Hello,

in message 
<OF711943DA.EE1C86A3-ON42256E4C.0033BE6B-08256E4C.0033E9D8 at mksinternal.com> 
you wrote:
> 
> >Please define "crash". Does the board  simply  reset  (like  after  a
> >watchdog timeout), or is there any error message, or what?
> 
> The board simply resets.

Then this is just the normal watchdog reset.

> >You always have to configure both sides to match, i. e. if you enable
> >the watchdog in U-Boot you must do so in  Linux,  and  if  you  don;t
> >enable  it  in  U-Boot  you must not enable it in Linux (althought in
> >that case you will not crash the system).
> 
> How do I enable it in Linux?

Select "CONFIG_WATCHDOG=y" and "CONFIG_WDT_MPC8XX=y".

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
An optimist believes we live in the best world possible; a  pessimist
fears this is true.