说明：  学习eCos嵌入式操作系统的一个不错的资料.ECOS由Redhat推出的小型即时操作系统(Real-Time operating system)，最低编译核心可小至10K的级别，适合用于作bootloader增强，微小型系统。
(ECos embedded operating system to learn a good information. ECOS Redhat released by the small real-time operating system (Real-Time operating system), the core can be compiled down to the lowest level of 10K, suitable for use as bootloader enhanced micro system.)