Provided by: dfu-util_0.5-1_amd64 bug


       dfu-util - Device firmware update (DFU) USB programmer


       dfu-util [-ldpciatUDRhvV]


       dfu-util  is  a program that implements the host (computer) side of the USB DFU (Universal
       Serial Bus Device Firmware Upgrade) protocol.

       In the OpenMoko project (for example), this  program  is  used  to  communicate  with  the
       specially enhanced u-boot boot loader, which implements the DFU device side.


       -l, --list
              List the currently attached DFU capable USB devices.

       -d, --device VENDOR:PRODUCT
              Specify  vendor/product  ID  of  the  DFU  device.  Both  VENDOR  and  PRODUCT  are
              hexadecimal numbers (no prefix needed).  Example:

                $ dfu-util --device 1457:51ab

              If you only have one standards-compliant DFU device attached to your  PC,  this  is
              optional.  However,  as soon as you have multiple DFU devices, dfu-util will detect
              this and abort, asking you to specify which device it shall use.

       -p, --path BUS-PORT. ... .PORT
              Specify the path to the DFU device.

       -c, --cfg CONFIG-NR
              Specify the configuration of the DFU device.

       -i, --intf INTF-NR
              Specify the DFU interface number.

       -a, --alt ALT
              Specify the altsetting of the DFU interface by name or by number.

       -t, --transfer-size
              Specify the number of bytes per USB transfer. If you don't supply this option,  the
              maximum possible size for your combination of host OS and USB device is chosen (for
              optimal performance).

       -U, --upload FILE
              Read firmware from device into FILE.

              Note: Upload support is currently broken.

       -D, --download FILE
              Write firmware from FILE into device.

       -R, --reset
              Issue USB reset signalling once we are finished.

       -s, --dfuse-address
              Specify target address for raw binary download/upload on DfuSe devices.  Do not use
              this for downloading DfuSe files.

       -h, --help
              Show a help text and exit.

       -v, --verbose
              Print more information about dfu-util's operation. A second -v will turn on verbose
              logging of USB requests.

       -V, --version
              Show version information and exit.


       Here are some examples for the usage of dfu-util in the OpenMoko project (working with the
       Neo1973 hardware):

       Flashing the rootfs:
         $ dfu-util -a rootfs -R -D /path/to/openmoko-devel-image.jffs2

       Flashing the kernel:
         $ dfu-util -a kernel -R -D /path/to/uImage

       Flashing the bootloader:
         $ dfu-util -a u-boot -R -D /path/to/u-boot.bin

       Copying a kernel into RAM:
         $ dfu-util -a 0 -R -D /path/to/uImage

       Once  this  has  finished,  the  kernel  will  be available at the default load address of
       0x32000000 in Neo1973 RAM.

       Note: You cannot transfer more than 2MB of data into RAM using this method.


       Please see for some limitations  and  bugs  in  the
       current dfu-util code.

       Please    report    any    further   bugs   at   on   the   openmoko   mailing   list   at


       dfu-util is covered by the GNU General Public License (GPL), version 2 or later.


       Weston Schmidt <>
       Harald Welte <>

       This manual page was written by Uwe Hermann <>.  It  is  licensed  under
       the terms of the GNU GPL (version 2 or later).

                                        February 29, 2008                             DFU-UTIL(1)