How to force imx6 into serial download mode when boot fuses is set to boot from eeprom

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How to force imx6 into serial download mode when boot fuses is set to boot from eeprom

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sivaalagarsamy
Contributor II

We have a board that has fuses set to boot from eeprom. I have uboot loaded in the eeprom and it boots into uboot fine.
I need to run the memory stress test on it. As I understand, there is a SDboot version which needs UART1 and there is a USB OTG version which requires the board to run in serial download mode.

I don't have access to UART1, but I have access to USB OTG, How do I force the board to run in serial download mode?

If I earse the u-boot from eeprom and not have any SD card, will it go into serial download mode? If so, do I have to erase the eeprom in any particular way so the imx6 knows that there is nothing in eeprom to boot and falls back to serial download mode.

Thanks,

Siva

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Siva

you are right, it is sufficient to erase eeprom (in particular dcd header region)

so processor falls to serial download mode.

Best regards

igor

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