[U-Boot] u-boot and watchdogs

[U-Boot] u-boot and watchdogs

[Dexdyne Postmaster]

Our hardware has a watchdog which has a maximum period of 1 second.

Once I've got Linux up and going I can handle that.

I'd love to have a watchdog so that if Linux doesn't take over, the board
will reset and try again.

Is there any experience/example of u-boot driving a short-period watchdog
throughout the boot process I can try to copy?

David Collier

www.dexdyne.com

[U-Boot] u-boot and watchdogs

[rhabarber1848]

Dexdyne Postmaster wrote:

> Is there any experience/example of u-boot driving a short-period watchdog
> throughout the boot process I can try to copy?

Hi,

have a look at include/watchdog.h
http://git.denx.de/?p=u-boot.git;a=blob;f=include/watchdog.h;h=9265be9737245d7a1e8468c398aef12d07945bad;hb=HEAD

and, for example, cpu/mpc8xx/cpu.c the function watchdog_reset().

Greetings, rhabarber1848

[U-Boot] u-boot and watchdogs

[Wolfgang Denk]

Dear "Dexdyne Postmaster",

In message <memo.20090811100117.12188C@postmaster+dexdyne.com.cix.co.uk> you wrote:
> Our hardware has a watchdog which has a maximum period of 1 second.
> 
> Once I've got Linux up and going I can handle that.
> 
> I'd love to have a watchdog so that if Linux doesn't take over, the board
> will reset and try again.
> 
> Is there any experience/example of u-boot driving a short-period watchdog
> throughout the boot process I can try to copy?

Yes, that's a standard feature used by many boards. Worst case is a
80 millisecond timeout with a tolerance of +/- 20 millisec.

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
Above all else -- sky.