[U-Boot] How to test watchdog timer values and ensuring it is working as intended

[brendan]

Hello,

I am using an Freescale/nxp mx6solo and I want to test that the watchdog
timer is working as intended.  I have enabled it on my board and have
confirmed it during boot

> U-Boot SPL 2015.04-g0f11429-dirty (Jan 18 2017 - 05:42:24)
> 
> Part number: VSM-SOLO-102
> Assembly: AS151004858
> Date of production: 2016 Feb 08
> NAND : 512 MiB
> 
> 
> U-Boot 2015.04-g0f11429-dirty (Jan 18 2017 - 05:42:24)
> 
> CPU:   Freescale i.MX6SOLO rev1.2 at 792 MHz
> CPU:   Temperature 53 C
> Reset cause: POR
> Board: Variscite VAR-SOM-MX6 SOM-Solo 792 MHz
>        
*
> Watchdog enabled
*
> I2C:   ready
> DRAM:  1 GiB
> NAND:  512 MiB
> MMC:   FSL_SDHC: 0, FSL_SDHC: 1
> auto-detected panel VAR-WVGA MX6CB-R
> Display: VAR-WVGA MX6CB-R (800x480)
> UBI init error 22
> Error: no valid bmp image at 18100000
> In:    serial
> Out:   serial
> Err:   serial
> eMMC:  3.5 GiB
> Net:   using phy at 7
> FEC [PRIME]
> Normal Boot
> Hit any key to stop autoboot:  0 

I have just initialised the watchdog and using the provided timeout values
in /drivers/watchdog/imx_watchdog.c which are 


> void hw_watchdog_init(void)
> {
>         struct watchdog_regs *wdog = (struct watchdog_regs
> *)WDOG1_BASE_ADDR;
>         u16 timeout;
> 
>         /*
>          * The timer watchdog can be set between
>          * 0.5 and 128 Seconds. If not defined
>          * in configuration file, sets 128 Seconds
>          */
> #ifndef CONFIG_WATCHDOG_TIMEOUT_MSECS
> #define CONFIG_WATCHDOG_TIMEOUT_MSECS 128000
> #endif
>         timeout = (CONFIG_WATCHDOG_TIMEOUT_MSECS / 500) - 1;
>         writew(WCR_WDZST | WCR_WDBG | WCR_WDE | WCR_WDT | WCR_SRS |
>                 SET_WCR_WT(timeout), &wdog->wcr);
>         hw_watchdog_reset();
> }
> #endif

I want to confirm that this is working so I was wondering how I am able to
test that the system is not kicking the watchdog.

Thanks



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