EWiLi's two rst editions were dedicated to the Embedded Linux operating system which has progressively constituted a strong alternative to proprietary and/or commercial solutions in embedded systems, whether it is deeply embedded or not, and this for many application domains, such as multimedia, telephony, and transport. The steering committee has considered requests from potential contributors and decided to extend the scope of the workshop to all embedded operating systems. We believe that this new perimeter will make the workshop even richer. It is the second edition of EWiLi as the embedded operating system workshop (and the 4th edition of the workshop), it aims at presenting state-of-the-art research, experimentations, signi cant and original realizations that focus on the design and implementation of embedded operating systems in both academic and industrial worlds. 2014's edition is hosted at the at the Faculdade de Cincias da Universidade de Lisboa (FCUL), in Lisbon, Portugal. It is the rst time the EWiLi workshop is organized out of France. EWiLi workshop featured three distinguished keynote speakers, delivering state-of-the-art presentation on a topic related to real-time and embedded operating systems: Mr. Pierre FICHEUX, CTO at OpenWide, Paris, France with a talk on "Android for industrial and RT applications" ; Mr. Helder SILVA, Embedded Systems Manager (Aeronautics & Space Systems Division) at EDISOFT, Portugal with a talk on "RTEMS and EDISOFT".