基于ARM的芯片多数为复杂的片上系统，这种复杂系统里的多数硬件模块都是可配置的，需要由软件来设置其需要的工作状态。因此在用户的应用程序之前，需要由专门的一段代码来完成对系统的初始化。-The majority of ARM-based chips for complex system on chip, the majority of this complex system of hardware modules are configurable, which requires software to set the working status of their needs. Therefore, the user application, you need a special code from the completion of system initialization.