linux加載rootfs 根文件系統 kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)

環境：linux內核加載本身的製做的文件系統。linux 錯誤信息有如下幾種：app 錯誤信息1：函數 Root-NFS: Server returned error -5 while mounting /mini2440/rootfs VFS: Unable to mount root fs via NFS, trying floppy. VFS: Cannot open root device

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