在写文件体系的时分呈现如下过错：
NAND erase: device 0 whole chip
Skipping bad block at0x00254000
Skipping bad block at0x00258000
Skipping bad block at0x0025c000
Skipping bad block at0x00260000
Skipping bad block at0x00264000
Skipping bad block at0x00268000
Skipping bad block at0x0026c000
Skipping bad block at0x00270000
Skipping bad block at0x00274000
………………………………….
解决办法：
进入u-boot的指令形式，输入 nand scrub格式化就可以了！
注：TQ2440的指令形式是输入q退出菜单便是指令形式.
