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Question, i.MX28 EVK boot

Question asked by AVNET JAPAN FAE (team share account) on Oct 6, 2016
Latest reply on Oct 6, 2016 by Yuri Muhin

Dear team,


I would like ask about the boot behavior of i.MX28-EVK.

Mu customer is trying to boot from SD card on your i.MX28 EVK board, and they saw the following phenomenon.

The boot goes to serial download mode even when SD-Card is inserted.

The procedure is as below;


When they set S2 switch to “1001”, and they verified SD boot operation succeeded.


After removing AC power supply from EVK, connect J82(USB-OTG port) to PC.


When they attached AC power supply to EVK, the boot seemed to go into serial download mode. Some characters seemed to be flowed out from USB port periodically.

And when they pushed POWER sw of EVK in the above situation, then SD boot started.


I think the right behavior of boot is;

Starting SD boot when S2 SW setting is set to SD card boot after power on even if USB port is connected to PC.



I think the normal POR reset of i.MX28 cannot be done by only the insertion of AC adapter to EVK. It may need to push POWER SW.

Please give your comment about the workaround of this issue.