enable watchdog in u-boot

[mishuk]

Hi !

We use zynq-7000 SoC.  We enable watchdog support in DTS file and watchdog works in Linux fine.  How can I get watchdog working in u-boot ?  I would like to load recovery linux image in case of loading linux freezes (broken image, broken rootfs, etc).  Is it possible ?

[kayas257]

Hello, 

I had enabled watchdog in u boot by adding 

#DEFINE CONFIG_WD

#DEFINE CONFIG_WDT_CDNS

In platform-top.h file in petalinux, 

Hope this solves your problem

[mishuk]

I added CONFIG_WD and CONFIG_WDT_CDNS

through project-spec/meta-user/recipes-bsp/u-boot/files/user_XXX.cfg and rebuild u-boot. I have tested watchdog timer in u-boot : it does not work.  What have I missed ? How can I tune watchdog parameters ?

[kayas257]

Did you set pmu flag to enable hardware watchdog?

Is it working in linux?

Which petalinux version ru using?

[mishuk]

Watchdog works in linux as expected.
We use petalinux 2017.2
Where must I enable PMU flag to enable hardware watchdog ?

[kayas257]

Sorry not for zynq 7000, pmu flags are only for zynq ultra scale, I have similar issue with uboot after upgrading to petalinux 2020.1, I will update once I solve it, but in 2019.2 it worked for me by adding that lines in platform-top.h file. 

[kayas257]

Hi

I found the solution Please also enable this flags in .cfg

CONFIG_SYSRESET_WATCHDOG=y

CONFIG_SPL_WATCHDOG_SUPPORT=y

CONFIG_SPL_WDT=y

CONFIG_WDT_CDNS=y

CONFIG_WDT=y