怎么释放nand剩余空间

godzilla

root@cubieboard:~/sunxi-tools# ./nand-part -f a20
check partition table copy 0: mbr: version 0x00000200, magic softw411
OK
check partition table copy 1: mbr: version 0x00000200, magic softw411
BAD!
check partition table copy 2: mbr: version 0x00000200, magic softw411
BAD!
check partition table copy 3: mbr: version 0x00000200, magic softw411
BAD!
mbr: version 0x00000200, magic softw411
5 partitions
partition  1: class =         DISK, name =   bootloader, partition start =    32768, partition size =    65536 user_type=0
partition  2: class =         DISK, name =          env, partition start =    98304, partition size =    32768 user_type=0
partition  3: class =         DISK, name =         boot, partition start =   131072, partition size =    65536 user_type=0
partition  4: class =         DISK, name =       rootfs, partition start =   196608, partition size =  4194304 user_type=0
partition  5: class =         DISK, name =        UDISK, partition start =  4390912, partition size = 10551296 user_type=0
怎么样把partition 5的空间合并崽rootfs上去，请高手解答