插入SD卡后，串口打印出下面信息：
mmc1: new high speed SDHC card at address 1234
mmcblk0: mmc1:1234 SA08G 7.21 GiB
mmcblk0: p1
当在media目录下输入’ls‘后，打印出下面信息：
UBIFS error (pid 87): ubifs_check_node: bad CRC: calculated 0xf3d45b75, read 0xb176fb8d
UBIFS error (pid 87): ubifs_check_node: bad node at LEB 138:108184
UBIFS error (pid 87): ubifs_read_node: expected node type 0
UBIFS error (pid 87): ubifs_iget: failed to read inode 488, error -117
UBIFS error (pid 87): ubifs_lookup: dead directory entry 'cf', error -117
ls: ./cf: Structure needs cleaning
card mmc1 mmcblk0p2 ram union
hdd mmcblk0p1 net realroot
不知道如何才能查看到SD卡内的数据
