详细介绍清根文件系统的基本结构，以及选择所需要的系统库、内核模块和应用程序等，配置好各种初始化脚本文件，选择合适的文件系统类型。(The basic structure of the root file system is introduced in detail, as well as the system library, kernel module and application program needed to be selected. Various initialization s