I want to develop usb modem support on xscale processor. the serial_fd/serial.c have two configurations. Can I use the simple serial configuration to support file download. and the other cdc configuration to support usb modem? Windows box call set_configure to switch function?

for usb modem, the windows box setup a new dial, the AT command and web request transfer through which endpoint? On my case (PC)At command receive through endpoint 0, not what I expect is cdc data interface two endpoints or cdc communication interface.

why serial.c have no endpoint assigned to cdc communication interface?

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