iMX8M Serial Download to Internal Boot Mode

[sahilnayak]

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.

[xarowubas]

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

[weidong_sun]

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

[weidong_sun]

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

[sahilnayak]

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.