i.MX53 with externel watchdog: How to detect Cold boot or Warm boot

[sprasad]

Hi All,

I am working on i.MX53 processor and my board have external watchdog.
My board resets with either external watch dog or soft reset.

In my application, need to find cold boot or warm boot. Do we have a choice to find cold boot or warm boot even it resets because of external watch dog or soft reset.

any one can help?

Thanks and Regards,

Prasad

[weidong_sun · Accepted solution]

Hello,sprasad,

     The following is just my personal advice ,Maybe they are useful:

NO.1

(1)hardware

Using 2 GPIOs on i.MX53 to sample Warm reset and cold reset. For Warm reset and Cold reset , delay their ouput time to CPU and PMIC.

(2)software

when warm reset or cold reset occur, software records it.

NO.2

Maybe you can use a low cost MCU to sample them.

Regards

weidong

[sprasad]

Thanks for your reply. My board have external watchdog which resets power supply to processor. Automatically when watchdog resets my board it GPIOs also gets cleared. If my understanding wrong please correct me.

Regards

S Prasad