U-Boot> nand read 0x21400000 0x00100000 0x700

NAND read: device 0 offset 0x100000, size 0x700
 1792 bytes read: OK
U-Boot> nand read 0x21400000 0x00100000 0x900

NAND read: device 0 offset 0x100000, size 0x900
 2304 bytes read: ERROR
U-Boot> nand read 0x21400000 0x00100000 0x800

NAND read: device 0 offset 0x100000, size 0x800
 2048 bytes read: ERROR
U-Boot> nand read 0x21400000 0x00100000 0x700

NAND read: device 0 offset 0x100000, size 0x700
 1792 bytes read: ERROR
U-Boot>