The design of the embedded system is advancing towards combination of software and hardware, and the embedded operation system is applied more and more extended . the embedded computer based on arm and linux attracts designers " attention by its characteristics, such as flexibility, diminishable of software and hardware, highly performance, low cost, and so on 嵌入式系统设计正在向着软硬件相结合的方向发展,嵌入式操作系统应用越来越广泛,而基于arm处理器和嵌入式linux的嵌入式计算机以其设计灵活、软硬件可裁剪、性能优越、成本低等特点和优势,倍受设计者和使用者青睐。