嵌入式系统初始化过程主要有 3 个环节，按照自底向上、从硬件到软件的次序依次为（ 请在此空作答 ）。系统级初始化主要任务是（ ）。
- A.片级初始化→系统级初始化→板级初始化
- B.片级初始化→板级初始化→系统级初始化
- C.系统级初始化→板级初始化→片级初始化
- D.系统级初始化→片级初始化→板级初始化
正确答案及解析
正确答案
解析
系统初始化过程可以分为 3 个主要环节，按照自底向上、从硬件到软件的次序依次为：片级初始化、板级初始化和系统级初始化。系统初始化：该初始化过程以软件初始化为主，主要进行操作系统的初始化。 BSP 将对嵌入式微处理器的控制权转交给嵌入式操作系统，由操作系统完成余下的初始化操作，包含加载和初始化与硬件无关的设备驱动程序，建立系统内存区，加载并初始化其他系统软件模块，如网络系统、文件系统等。最后，操作系统创建应用程序环境，并将控制权交给应用程序的入口。
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