how to feed the external hardware watchdog in the imx6sx uboot.

pisces · ‎08-16-2021

Hi

we add an external watchdog on our board. so we need to feed this on our uboot stage.

i had enabled CONFIG_HW_WATCHDOG and CONFIG_IMX_WATCHDOG and also rewrite the function of hw_watchdog_reset. but it still doesn't work.

We use the GPIO1_IO03 to feed the external wd.

code like this:

struct gpio_regs *regs =(struct gpio_regs *)GPIO1_BASE_ADDR;

u32 l;
l = readl(&regs->gpio_dir);
l |= 1 << 3;
writel(l, &regs->gpio_dir);//set dir.

l = readl(&regs->gpio_dr);
l &= ~(1 << 3);
writel(l, &regs->gpio_dr);
for(i=0;i<1000;i++);
l |= 1 << 3;
writel(l, &regs->gpio_dr);

Once, in uboot, it run to this code, our board will reset auto.

does anyone have any ideas ? or who know how to feed external watchdog correctly on uboot ?

thanks.

igorpadykov · ‎08-16-2021

Hi Frank

one can look at uboot wdog documentation

there is uboot imx_watchdog_reset() function in driver which seems never used in codes,

one can try to adjust it for external wdog :

In general may be recommended to post it on uboot mail list

Best regards
igor