I want access on board uart in debian but when i tried it showing permission denied. can anyone please suggest some procedure to access uart in debian.
We recently added 96Boards support to Intel's IoT mraa  and upm libraries.We validated GPIOs and I2C using Grove sensors so I see no reason why the UART support would not work.
Maybe this could be the easiest way for you. Please let me know if you encounter any issues.
 https://github.com/intel-iot-devkit/mraa/blob/master/src/arm/96boards.c https://github.com/intel-iot-devkit/upm