嵌入式软件在线升级系统的设计与实现

Design and Implementation of Online Software Updating for Embedded System

对嵌入式软件在线升级有利于维持系统的稳定性,可实现在线测试,支持系统在线重构,是提高系统可靠性的有效途径;对嵌入式软件的在线升级进行了研究,研究了在线升级的颗粒度和升级点的选择,分析了程序状态的识别和恢复,提出了采用动态分析与静态分析相结合的方法保证升级的安全的方法,实现了在线升级方案;基于在线升级方案构建嵌入式软件系统,实现了应用系统软件的模块级粒度的升级;最后基于在线升级系统设计实现了小卫星星务管理软件,具备了灵活的在线升级能力,表明在线升级系统具有很好的工程实用价值。

Online software updating for embedded system maintains the stability of platform, enables regression test, supports dynamic reconstruction. It also enhances system reliability and usability. Granularity and updating point is studied, recognition and restore of pro gram state is analyzed, method of online software updating based on dynamic program analysis and static source code analysis is proposed to ensure the safety of updating. Embedded online software updating system is designed and implemented with this study. Furthermore, one real On--Board Data House--keeping software is built on the basis of this system with module granularity which means online software updating system is very useful for building embedded systems.