Whether IMx6ull supports OpenwrT or not, I see that the official website only supports 6D and 6Q, but 6U does not. Can you provide a link to the official website? My email address is 1291015298@qq.com, thank you!
It can support but NXP don´t provide the code. You need to add yourself. About the information of OpenWRT please refer to the OpenWRT website and it’s documentation: