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[xuyuanzhi]

When download the Imx8m's Image, the Imx8m EVK board use the J901 USB TYPE-C conncector. I wonder when use the Mfgtool download the Image through this port , the usb is running USB2.0 or USB3.0?  When downloading Image, if only the usb1_dp and usb1_dn is needed, the other usb signals is not neceasary? Thank you!

[Yuri]

Hello,

  Note, after boot ROM loads some primary bootloader, this bootloader can use USB3. 

Regards,

Yuri.

[Yuri · Accepted solution]

Hello,

  The boot ROM supports the USB OTG port for boot purposes. The other USB ports on the chip are not supported for boot. So, only OTG (USB2) signals (including OTG_ID) are involved in the serial boot mode.

Have a great day,
Yuri

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[xuyuanzhi]

"only OTG (USB2) signals (including OTG_ID) are involved in the serial boot mode".  Are you meaning that  : only OTG (USB1, not USB2) signals (including USB1_ID, USB1_DP, USB1_DN and USB1_VBUS) are involved in the serial downloading mode? Thank you!

[Yuri]

Correct.

[xuyuanzhi]

Thank you!