In any embedded system, there are multiple components like memory, communication channels, IOs, user interfaces and even multiple processing element. There is a need for a mechanism to streamline access to these resources and help manage them efficiently and based on various usage scenarios. Using Operating Systems for this purpose is the best and sometimes the only way to meet the overall functional and performance requirements. There are a variety of OS’s available for use in embedded systems ranging from a basic RTOS to a monolithic kernel powered full-fledged OS. Choosing the right OS for the right hardware and right application is the foremost step in developing the embedded software. And in most cases the OS’s are not readily run-able in the target hardware and its underlying hardware interfacing part called the Board Support Package needs some amount of customization.