后来发现是我的busybox没有设置对导致的。
现在出现新问题了
can't open /dev/tq2440_serial0: No such file or directory
can't open /dev/tq2440_serial0: No such file or directory
can't open /dev/tq2440_serial0: No such file or directory
can't open /dev/tq2440_serial0: No such file or directory
can't open /dev/tq2440_serial0: No such file or directory
can't open /dev/tq2440_serial0: No such file or directory
can't open /dev/tq2440_serial0: No such file or directory
can't open /dev/tq2440_serial0: No such file or directory
can't open /dev/tq2440_serial0: No such file or directory
can't open /dev/tq2440_serial0: No such file or directory
can't open /dev/tq2440_serial0: No such file or directory
can't open /dev/tq2440_serial0: No such file or directory
can't open /dev/tq2440_serial0: No such file or directory
can't open /dev/tq2440_serial0: No such file or directory
can't open /dev/tq2440_serial0: No such file or directory
can't open /dev/tq2440_serial0: No such file or directory
*** Warning - bad CRC or NAND, using default environment