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Intel Edison has three UART ports, i.e. port 0 - Bluetooth port 1 - auxiliary, available for general purpose use port 2 - debugging, usually console output is here Enable all of them for future use. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>