topic Re: iMX8M Serial Download to Internal Boot Mode in i.MX Processors

iMX8M Serial Download to Internal Boot Mode

sahilnayak — Tue, 22 Sep 2020 12:45:46 GMT

Hi NXP Team,

We had one query regarding boot mode switching in iMX8M.

When we flash the processor in serial download mode, after flashing, is there any way we can switch to internal boot mode without rebooting the processor??

Your quick response will be highly appreciated.

Re: iMX8M Serial Download to Internal Boot Mode

weidong_sun — Tue, 22 Sep 2020 13:27:47 GMT

Hi sahilnayak ,

From Serial Download mode to internal boot mode, BOOT_MODE[1:0] pins must be re-configred, then reset proccessor. system will boot from internal mode. No other way to realize the purpose.

Have a nice day!

B.R,

weidong

Re: iMX8M Serial Download to Internal Boot Mode

sahilnayak — Tue, 22 Sep 2020 14:17:37 GMT

Hi Weidong,

Thanks for your quick response.

We have battery in our system which will remain embedded all the time.

Consider the situation where we are flashing image first time in the processor. So by BOOT_MODE configurations, we will be in internal boot mode only. When we power ON it will automatically go in serial downloader, as there is no image in the processor.

In that case after flashing processor, can we use the ONOFF pin to power OFF and then power ON the processor, so that it can boot from internal boot mode??

Please advice and provide appropriate solution.

Re: iMX8M Serial Download to Internal Boot Mode

weidong_sun — Wed, 23 Sep 2020 00:13:32 GMT

Hi sahilnayak,

If eMMC on board is empty, it means that it is the first time to program image into eMMC, you can do like this:

1. Setting BOOT_MODE[1:0] internal mode

2. Download images to board.

3. reset board.

cold reset or warm reset are both ok.

---cold reset : means reset PMIC , which is similar to power on.

---warm reset: reset cpu via POR_B pin.

So don't need operation ON/OFF.

Hope above information is helpful for you.

Have a nice day!

B.R,

Weidong

Re: iMX8M Serial Download to Internal Boot Mode

xarowubas — Fri, 25 Sep 2020 21:29:02 GMT

If you're flashing Android images you can use fastboot, without entering serial download mode