Download firmware through i.mx6ul OTG USB port from PC

[bulixu]

I have a custom board based on i.mx6ul and have problem in using Mfgtool2.exe to download firmware on to i.mx6ul ram through i.mx6ul OTG USB port from PC. The board is configured in serial downloader mode. A USB cable is used to connect between PC and i.Mx OTG port (USB_OTG_D+, USB_OTG_D-, USB_OTG_ID pins). When pulling USB_OTG_ID pin high, PC detects an unknown USB device, but failed in finding and installing USB device driver.

Can anybody help? I assume that the OTG USB port should be configured as device not a host for this case. Are there any specific requirements on the OTG USB cable, such as 90 Ω differential line impedance? Does NXP provide USB  driver?

Thanks,

[igorpadykov]

Hi Buli

to narrow down issue one can try i.MX6UL EVK on the same computer.

There are no specific requirements on the OTG USB cable, no special USB  driver

needed, boot ROM does not check USB_OTG_ID. For custom board one can check

hardware using Hardware Development Guide for the i.MX 6UltraLite Applications Processor
https://www.nxp.com/docs/en/user-guide/IMX6ULHDG.pdf 

Best regards
igor
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