How can I boot from usb and mount rootfiles on usb?

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Mediatek MT7628AN (+ MT7612E) eval board

Hi everyone, I'm working on a chinese dual radio (2.4 and 5 Ghz) router that is based on the Mediatek MT7628AN evaluation board. The 5Ghz chip is MT7612E. I was able to install lede-17.01.4-ramips-mt7628 on it and everything works, except the 5Ghz radio (which is not even detected by LEDE). I'm sending below information about the hardware in hopes you guys have any suggestions to make the 5Ghz radio work. Thanks in advance. Complete boot log: U-Boot 1.1.3 (Feb 15 2017 - 09:49:45) Boar…