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IWR1642: Building IWR1642 custom board

Part Number: IWR1642

Hello,

I am now trying to build a custom board using IWR1642.

Our design is almost the same with the IWR1642Boost except some GPIOs

Flashing the chip will be done through uart over USB or RS232 selective with a 0 ohm resistor.

For uart over USB, TI design uses TM4C1294NCPDTT3. Here is my question.

Do I need to program the TM4C before applying the board?

Or I just mount the part and plug it in USB port of PC, then PC automatically recognize the device? 

Please let me know it.

THANKS.

Regards

S. BAE