unable to use GPIO, UART, SPI etc in Freertos in Intel Galieo Gen 2

I am newbie in Freertos. I have just started working on Freertos, so forgive me if my question is silly. I have got Intel Galileo Gen 2 board, in which I successfully run a demo application of Freertos. Link for the tutorial is here. Now I tried to make my own application. For this I study some Freertos tutorials. Link for the tutorial is here.. After reading this tutorial I have leaed basics of Freertos but I can't figure out how to use use GPIO, UART, SPI etc of my board. There is nothing available on inteet regarding my problem. Is there any library available which I can use for my GPIO, UART, SPI etc in Freertos in Intel Galelio Gen2 or there any other approach to use GPIO, UART, SPI etc?