ARM系统中多种启动代码的实现

Realization of Various Start Code in ARM System

在ARM系统中,启动代码的作用类似于电脑中的BIOS,它从系统上电开始就接管CPU,完成系统所需资源的配置。因此,优秀的启动代码既可以使程序快速地跳进应用程序的主函数,又可以保证程序稳定高效地运行。文章重点介绍了使用基本链接程序功能产生"映像文件"并进行加载、执行和使用分散载入描述文件创建映像并进行加载和执行。

In the ARM system, the function of start code is similar to BIOS in the computer. As the electricity starts, the start code begins to take over CPU to complete the resources disposition. Therefore, an excellent start code not only can make programs quickly jump to main funtion, but also ensure the stabilization and high efficiency. In this paper, the loading and execution of ＂image file＂generated by using basic link function are introduced. Images created by scatter loading description file are loaded and executed.