擦除nandflash时出错，用的tftp擦写方式

Really scrub this NAND flash? <y/N> : y
Erasing at 0x7320000 --  45% complete.
NAND 256MiB 3,3V 8-bit: MTD Erase failure: -5
Erasing at 0x8280000 --  51% complete.
NAND 256MiB 3,3V 8-bit: MTD Erase failure: -5
Erasing at 0x9c20000 --  61% complete.
NAND 256MiB 3,3V 8-bit: MTD Erase failure: -5
Erasing at 0x9ec0000 --  62% complete.
NAND 256MiB 3,3V 8-bit: MTD Erase failure: -5
Erasing at 0xbae0000 --  73% complete.
NAND 256MiB 3,3V 8-bit: MTD Erase failure: -5
Erasing at 0xeb80000 --  92% complete.
NAND 256MiB 3,3V 8-bit: MTD Erase failure: -5
Erasing at 0xee00000 --  93% complete.
NAND 256MiB 3,3V 8-bit: MTD Erase failure: -5
Erasing at 0xf5c0000 --  96% complete.
NAND 256MiB 3,3V 8-bit: MTD Erase failure: -5
Erasing at 0xf840000 --  97% complete.
NAND 256MiB 3,3V 8-bit: MTD Erase failure: -5
Erasing at 0xffe0000 -- 100% complete.
OK
TQ2440擦除nand时出现这种情况请问哪位知道是什么问题，急，在线等！

nand坏块。应该不会影响使用