I am new to this but I think my question is related to the task you want to do. I want to flash my eMMC(MMC1) with a debian. I want it to use USB1. But the Sysboot option only has USB0 which does not support mass storage. Upon reading your approach, I just want to clarify something. When you boot from USB_ether, did you have u-boot in eMMC or somewhere else? I also realized that I don't have to boot from USB mass storage if I can make booting from USB ether works but I really have no idea on the u-boot side.
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