nvram command to join wifi before start Osx

[Aigors]

Hi, i have a question, do someone know if exist some nvarm command to write wifi-network-name and password to join wifi before starting system? 

I have one z87n-wifi with mini pci wifi card ( athereos 9285 ) natively knows by osx, i dont knoww if via nvram i can join some wifi before desktop arrive, i could imagine a sort of

nvram wifi-network="mywifi"

nvram wifi-password="password"