Hi weidong sun:
By default, Imx8qm download linux image files through the type-C interface. As shown in the picture "Default Download". But now i want download linux image files througt the USBOH interface. I refer to the "8.5 How to enable USB 2.0 in U-Boot for i.MX 8QuadMax/8QuadXPlus"section of "Android_User's_Guide.pdf", The modifications on linux is invalid. But it's work on Android platform. The attached file is my modification of u-boot.