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doc: dfu: Add dfu documentation
Add documentation for dfu stack and "dfu" command. Reviewed-by: Lukasz Majewski <lukma@denx.de> Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
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Patrick Delaunay
Marek Vasut
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doc/README.dfu
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144
doc/README.dfu
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# SPDX-License-Identifier: GPL-2.0+
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Device Firmware Upgrade (DFU)
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Overview:
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The Device Firmware Upgrade (DFU) allows to download and upload firmware
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to/from U-Boot connected over USB.
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U-boot follows the Universal Serial Bus Device Class Specification for
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Device Firmware Upgrade Version 1.1 the USB forum (DFU v1.1 in www.usb.org).
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U-Boot implements this DFU capability (CONFIG_DFU) with the command dfu
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(cmd/dfu.c / CONFIG_CMD_DFU) based on:
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- the DFU stack (common/dfu.c and common/spl/spl_dfu.c), based on the
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USB DFU download gadget (drivers/usb/gadget/f_dfu.c)
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- The access to mediums is done in DFU backends (driver/dfu)
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Today the supported DFU backends are:
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- MMC (RAW or FAT / EXT2 / EXT3 / EXT4 file system)
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- NAND
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- RAM
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- SF (serial flash)
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These DFU backends are also used by
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- the dfutftp (see README.dfutftp)
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- the thordown command (cmd/thordown.c and gadget/f_thor.c)
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Configuration Options:
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CONFIG_DFU
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CONFIG_DFU_OVER_USB
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CONFIG_DFU_MMC
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CONFIG_DFU_NAND
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CONFIG_DFU_RAM
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CONFIG_DFU_SF
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CONFIG_CMD_DFU
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Environment variables:
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the dfu command use 3 environments variables:
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"dfu_alt_info" : the DFU setting for the USB download gadget with a comma
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separated string of information on each alternate:
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dfu_alt_info="<alt1>;<alt2>;....;<altN>"
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"dfu_bufsiz" : size of the DFU buffer, when absent, use
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CONFIG_SYS_DFU_DATA_BUF_SIZE (8MiB by default)
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"dfu_hash_algo" : name of the hash algorithm to use
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Commands:
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dfu <USB_controller> <interface> <dev> list
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list the alternate device defined in "dfu_alt_info"
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dfu <USB_controller> <interface> <dev>
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start the dfu stack on the USB instance with the selected medium
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backend and use the "dfu_alt_info" variable to configure the
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alternate setting and link each one with the medium
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The dfu command continue until receive a ^C in console or
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a DFU detach transaction from HOST.
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The possible values of <interface> are :
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(with <USB controller> = 0 in the dfu command example)
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"mmc" (for eMMC and SD card)
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cmd: dfu 0 mmc <dev>
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each element in "dfu_alt_info" =
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<name> raw <offset> <size> raw access to mmc device
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<name> part <dev> <part_id> raw acces to partition
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<name> fat <dev> <part_id> file in FAT partition
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<name> ext4 <dev> <part_id> file in EXT4 partition
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with <partid> is the GPT or DOS partition index
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"nand" (raw slc nand device)
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cmd: dfu 0 nand <dev>
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each element in "dfu_alt_info" =
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<name> raw <offset> <size> raw access to mmc device
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<name> part <dev> <part_id> raw acces to partition
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<name> partubi <dev> <part_id> raw acces to ubi partition
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with <partid> is the MTD partition index
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"ram"
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cmd: dfu 0 ram <dev>
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(<dev> is not used for RAM target)
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each element in "dfu_alt_info" =
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<name> ram <offset> <size> raw access to ram
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"sf" (serial flash : NOR)
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cmd: dfu 0 sf <dev>
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each element in "dfu_alt_info" =
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<name> ram <offset> <size> raw access to sf device
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Host tools:
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When U-Boot runs the dfu stack, the DFU host tools can be used
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to send/receive firmwares on each configurated alternate.
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For example dfu-util is a host side implementation of the DFU 1.1
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specifications(http://dfu-util.sourceforge.net/) which works with U-Boot.
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Usage:
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Example for firmware located in eMMC or SD card, with:
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- alternate 1 (alt=1) for SPL partition (GPT partition 1)
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- alternate 2 (alt=2) for U-Boot partition (GPT partition 2)
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The U-Boot configuration is:
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U-Boot> env set dfu_alt_info "spl part 0 1;u-boot part 0 2"
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U-Boot> dfu 0 mmc 0 list
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DFU alt settings list:
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dev: eMMC alt: 0 name: spl layout: RAW_ADDR
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dev: eMMC alt: 1 name: u-boot layout: RAW_ADDR
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Boot> dfu 0 mmc 0
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On the Host side:
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list the available alternate setting:
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$> dfu-util -l
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dfu-util 0.9
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Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
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Copyright 2010-2016 Tormod Volden and Stefan Schmidt
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This program is Free Software and has ABSOLUTELY NO WARRANTY
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Please report bugs to http://sourceforge.net/p/dfu-util/tickets/
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Found DFU: [0483:5720] ver=0200, devnum=45, cfg=1, intf=0, path="3-1.3.1", \
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alt=1, name="u-boot", serial="003A00203438510D36383238"
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Found DFU: [0483:5720] ver=0200, devnum=45, cfg=1, intf=0, path="3-1.3.1", \
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alt=0, name="spl", serial="003A00203438510D36383238"
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To download to U-Boot, use -D option
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$> dfu-util -a 0 -D u-boot-spl.bin
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$> dfu-util -a 1 -D u-boot.bin
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To upload from U-Boot, use -U option
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$> dfu-util -a 0 -U u-boot-spl.bin
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$> dfu-util -a 1 -U u-boot.bin
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To request a DFU detach and reset the USB connection:
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$> dfu-util -a 0 -e -R
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