自己烧写Linux 后不能启动Linux 出现以下错误

Please append a correct "root=" boot option; here are the available partitions:
1f00            1024 mtdblock0 (driver?)
1f01            3840 mtdblock1 (driver?)
1f02            3072 mtdblock2 (driver?)
1f03           61440 mtdblock3 (driver?)
1f04           61440 mtdblock4 (driver?)
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(31,3)

是不是 cmd_line 搞错了呢，请把linux的启动信息打印出来，那里面有提示的