samsung released ICS open souce for galaxy chat b5330 , i think we can use it for our Y am not sure about it ,
link : http://opensource.samsung.com/index.jsp;jsessionid=118A6216889722275485EEE5164E918A
link : http://opensource.samsung.com/index.jsp;jsessionid=118A6216889722275485EEE5164E918A