A20 Lime2-4GB How to access ps2 ?

[AnkyB]

I m using A20Lime2-4gb with official debian8 jessie image and trying to use ps2-0 (pin PI20, PI21) and ps2-1(pin PI14, PI15) for i2c communication. I am able to use other i2c-[0-5] successfully (using python module) and now I want to access both ps2 , I have enabled both of them in script.fex.
How to access these pins ?