高可靠性的嵌入式软件现场更新方法

New update method with high-reliability for embedded system software

针对传统嵌入式软件更新方法的不足,提出了一种高可靠性的嵌入式软件现场更新方法,通过读取SD卡上的更新文件来更新嵌入式设备的Flash分区,从而实现设备软件的更新。该方法在保证快速更新功能的前提下,采用更新文件兼容性避错检测、双Bootloader设计、更新文件验证及软件异常处理机制,有效提高了软件的避错、容错性能。通过Nelson模型可靠性评估及其在产品中的应用,证明该更新方法具有高可靠性。

Concerning the shortages of traditional embedded software updates a new on-site update method with highreliability was proposed which achieved embedded system software updating by copying update files from a SD card to the flash partitions of the embedded device.On condition of fast update the compatibility detection of update files for faultavoidance the double-Bootloader design the test and verification of the update files and the exception handling mechanism were adopted to effectively improve fault-avoidance and fault-tolerance properties of the software.The high reliability of this method is proved through the reliability assessment based on the Nelson model and the application in the product.