14. cp--------- to copy the contents in the memory
      cp 32000000 0 40000--------- to copy 0x40000 bytes of contents from the address 0x32000000 in the memory to the 0x0

15. mw--------- to write the contents in the RAM，
     mw 32000000 ff 10000---------to set the 0x10000 bytes of contents that starts from the address 0x32000000 to be 0xFF

16. md--------- to modify the contents in the RAM,
      md 32000000 (base address of memory)

17. usb---------
    l usb start--------- to start the USB function
    l usb info--------- to list devices
    l usb scan--------- to scan usb storage(U disk) devices

18. fatls usb 0---------to list the files in the first U disk

19. fatload--------- to read a file in the FAT, for example:
      fatload usb 0:0 32000000 aa.txt --------- to read the aa.txt file in the USB to 0x32000000 in the physical memory

20. flinfo--------- to list the information of Flash

21. loadb--------- to receive files from kermit or super terminal via KERMIT protocol

22. nfs: nfs 32000000 192.168.0.2: aa.txt --------- to read the “aa.txt” file from the NFS filesystem in the 192.168.0.2 to the address 0x32000000 in the memory.