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Port recognition by device

I have connected a da Vinci TMS320DM365-OV7915 EVM to a linux PC through USB port. I have written an application for USB CDC class driver for the PC to communicate with the EVM board. The master (PC) has recognised the ttyACM0 driver. But the device has not. So.. I would be very grateful if you could explain to me how does the EVM board recognizes which port is validated?

Thank you,

-Sai