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 scr ipt files are configured, and the appropriate file system type is selected.)