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In certain situations, it is necessary to have an easy and fast second ethernet interface. For example for testing some dual ethernet purposes and then properly designing the carrier board.
It s is possible to buy a well-sold USB to ethernet adapter like the [https://www.amazon.com/UGREEN-Ethernet-Adapter-Nintendo-Chromebook/dp/B00MYT481C USB to 10 /100 Mbps ethernet adapter]
This Application Note (AN) shows how to use it on a system running a DESK-MX6-L-based Yocto Linux distribution in Linux userspace and even in U-Boot.