By means of this below post on forum
I am able to understand how to enable GPIO pin to be accessed at Linux. But, i am not sure of which file to modify. If you look at the above link, there is specific file which needs tobe modified.
Can somebody please let me know which file to modify [I am working on BSC9131 RDB].
Also, wanted to know what other options do i have to access GPIO apart from the method stated above [in the weblink].