System can't detect USB hub when cold boot

System can’t detect USB hub when cold boot, need replug USB hub or reboot system.
Not all USB hub will meet this problem

Hi,
Please do power-cycle after booting:
https://elinux.org/L4T_Jetson/r32.2.1_patch
[Jetson Nano]Power control

Our NC_N1 carrier board doesn’t use Realtek USB hub chip as Jetson Nano Developer Kit. we use default usb 3.0 and use external usb hub. if any suggestion for this case.

Hi,
We would suggest you perform USB compliance test.
https://developer.nvidia.com/jetson-nano-interface-tuning-and-compliance-guide-application-note

Is there any way to reset the default USB3.0 port?

Hi,
It is not possible due to design of Nano module. So we work with hub vendor to have the sample app of executing power cycle.