NAND scrub: device 0 whole chip
Warning: scrub option will erase all factory set bad blocks!
There is no reliable way to recover them.
Use this command only for testing purposes if you
are sure of what you are doing!
Really scrub this NAND flash? <y/N> : y
Erasing at 0x7fe0000 -- 50% complete.
NAND 256MiB 3,3V 8-bit: MTD Erase failure: -5
Erasing at 0xc7a0000 -- 78% complete.
NAND 256MiB 3,3V 8-bit: MTD Erase failure: -5
Erasing at 0xffe0000 -- 100% complete.
OK