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How to test watchdog timer values and ensuring it is working as intended

U-Boot brendan 1 participant 1 message Jan 18, 2017

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brendan

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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

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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

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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

*

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Watchdog enabled

*

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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
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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

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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

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#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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