topic Re: Hardware watchdog SP706SEN in i.MX Processors

Hardware watchdog SP706SEN

haibohe — Tue, 15 Dec 2015 09:31:52 GMT

Freescale Support：您好

CPU: i.MX6Q fsl-arm-yocto-bsp.git -b imx-3.14.28-1.0.0_ga

Project requirements:

Because the product demand WDI uses an external watchdog (Hardware watchdog SP706SEN), the uboot and kernel how to add this drive IO interrupt handling it?

Hardware watchdog SP706SEN

Please help

Re: Hardware watchdog SP706SEN

igorpadykov — Wed, 16 Dec 2015 01:24:27 GMT

Hi haibo

one can modify wdog driver removing processor wdog and adding external watchdog

codes, please check attached Linux Manual Chapter 50 Watchdog (WDOG)

Driver Linux Manual. For uboot one can check

[U-Boot] [PATCH 1/1] mx51/mx53/mx6: add watchdog

Best regards

igor

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Re: Hardware watchdog SP706SEN

haibohe — Wed, 16 Dec 2015 08:48:39 GMT

SW1 for the closed, Constant reset,In the boot Start feeding the dog ,How to deal with, thank you

Re: Hardware watchdog SP706SEN

haibohe — Thu, 17 Dec 2015 08:27:25 GMT

Figure:

app test

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <fcntl.h>

int main(void)

{

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

int ret = 0;

if (fd == -1) {

perror("watchdog");

exit(EXIT_FAILURE);

}

while (1) {

ret = write(fd, "\0", 1);

if (ret != 1) {

ret = -1;

break;

}

printf("hehaibo test\n");

sleep(1);

}

close(fd);

return ret;

}

How to WDI －> 177 the output pin of the IO (DISP0_CONTRAST)

Re: Hardware watchdog SP706SEN

haibohe — Fri, 18 Dec 2015 11:21:02 GMT

From uboot to kernel's external watchdog to add code or open what flag, please help, thank you