[U-Boot] OMAP watchdog timer reset on BBB

Stefan Roese sr at denx.de
Thu Sep 12 14:37:59 UTC 2019

Hi Sam,

On 12.09.19 15:45, Sam Protsenko wrote:
> Hi Suniel,
> After transition to DM WDT, watchdog timer on BeagleBone Black resets
> the board after 1 minute or so. I'm using this defconfig: [1]. After
> disabling CONFIG_WDT and CONFIG_WATCHDOG options the board doesn't
> reset. I guess it might be happening on other boards using
> CONFIG_WDT_OMAP3 as well. The issue can be reproduced by stopping in
> U-Boot shell (=>) and waiting for 1 minute.
> Do you know by chance why it might be happening, or maybe some fix
> already exists?
> Thanks!
> [1] https://pastebin.ubuntu.com/p/Zz5bY6cYXS/

So you have enabled the watchdog and should see something like this
upon bootup:

WDT:   Started without servicing (60s timeout)

Is this correct? Then you need to enable the U-Boot internal WDT
servicing by enabling CONFIG_WATCHDOG as well, as this will
result in the internal U-Boot servicing of the watchdog. Then
you should see this upon bootup and no reset will appear in

WDT:   Started with servicing (60s timeout)

Does this help?


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