i.MX ProcessorsのトピックRe: Watchdog rebooting kernel

Watchdog rebooting kernel

chandraevolute — Tue, 28 Jun 2016 10:46:36 GMT

I am working with watchdog now

I wrote a small piece of code to understand the working of software watchdog

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <fcntl.h>

#include <sys/ioctl.h>

#include <linux/types.h>

#include <linux/watchdog.h>

void Keep_Alive(int fd)

{

// int options = 0;

int pretimeout = 10;

int options = 0;

ioctl(fd, WDIOS_ENABLECARD, &options);

ioctl(fd, WDIOC_SETPRETIMEOUT, &pretimeout);

// ioctl(fd, WDIOC_SETOPTIONS, &options);

printf("Watchdog Alive \n");

}

void Kill(int fd)

{

write(fd, "V", 1);

printf("Watchdog killed\n");

}

int main()

{

int fd;

int timeout = 15;

fd = open("/dev/watchdog", O_WRONLY);

if(fd == -1)

{

fprintf(stderr, "Watchdog faild to open");

return ;

}

else

{

ioctl(fd, WDIOC_SETTIMEOUT, &timeout);

printf("The timeout was set to %d seconds\n", timeout);

}

while(1)

{

Keep_Alive(fd);

sleep(10);

}

// Kill(fd);

}

Output :

root@imx6ulevk:/media# ./WatchDog

The timeout was set to 15 seconds

Watchdog Alive

watchdog pre-timeout:10, 5 Seconds remained

Watchdog Alive

U-Boot 2015.04-imx_v2015.04_3.14.38_6ul_ga+g5d63276 (May 16 2016 - 14:32:19)

I am kicking the watchdog for every 10 seconds still the board is rebooting after 15 secs.

What is the wrong i am doing.

i am using imx6ulevk board and 3.14.38 kernel.

Re: Watchdog rebooting kernel

chandraevolute — Tue, 28 Jun 2016 11:11:32 GMT

my bad i overlooked the options of watchdog.

I changed ioctl(fd, WDIOC_SETPRETIMEOUT, &pretimeout); this line to ioctl(fd, WDIOC_KEEPALIVE, &options);

Re: Watchdog rebooting kernel

igorpadykov — Tue, 28 Jun 2016 11:14:12 GMT

Hi chandra

one can check if serviced correctly WDOGx_WSR register :

0x5555 Write to the Watchdog Service Register (WDOG_WSR).

0xAAAA Write to the Watchdog Service Register (WDOG_WSR).

use, for example memtool and try to reset wdog.

Best regards

igor

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Re: Watchdog rebooting kernel

chandraevolute — Tue, 28 Jun 2016 11:24:18 GMT

Hi igorpadykov

How can I write values directly to resgisters in linux?? How can I check the register values?