Ajay,
Is this xDot on a custom board? If it’s on the DK, the USBTX/RX pins are also connected to a UART on the interface processor. I’d have to ask our HW guys if that would be an issue. If it’s on a custom board, you probably know better than I do if it would cause any problems or not.
The NONE log level is only for the MTSLog class. It will prevent any LogError, LogInfo, LogTrace, etc statements from printing out the debug port, but it will not prevent printf statements from printing out the UART.
Cheers,
Mike