91 lines
3.7 KiB
ReStructuredText
91 lines
3.7 KiB
ReStructuredText
USB support
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===========
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USB host support
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----------------
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barebox has support for both USB host and USB device mode. USB devices
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take a long time to probe, so they are not probed automatically. Probing
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has to be triggered using the :ref:`command_usb` or :ref:`command_detect` command.
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USB devices in barebox are not hot-pluggable. It is expected that USB
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devices are not disconnected while barebox is running.
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USB Networking
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^^^^^^^^^^^^^^
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barebox supports ASIX-compatible devices and the SMSC95xx. After
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detection, the device shows up as eth0 and can be used like a regular network
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device.
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To use a USB network device together with the :ref:`command_ifup` command, add the
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following to ``/env/network/eth0-discover``:
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.. code-block:: sh
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#!/bin/sh
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usb
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USB mass storage
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^^^^^^^^^^^^^^^^
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barebox supports USB mass storage devices. After probing them with the :ref:`command_usb`
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command, they show up as ``/dev/diskx`` and can be used like any other device.
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USB device support
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------------------
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DFU
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^^^
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USB Device Firmware Upgrade (DFU) is an official USB device class specification of the USB
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Implementers Forum. It provides a vendor-independent way to update the firmware of embedded
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devices. The current specification is version 1.1 and can be downloaded here:
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http://www.usb.org/developers/devclass_docs/DFU_1.1.pdf
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On the barebox side, the update is handled with the :ref:`command_dfu` command.
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It is passed a list of partitions to provide to the host. The partition list
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has the form ``<file>(<name>)<flags>``. ``file`` is the path to the device or
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regular file which shall be updated. ``name`` is the name under which the partition
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shall be provided to the host. For the possible ``flags`` see
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:ref:`command_dfu`. A typical ``dfu`` command could look like this:
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.. code-block:: sh
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dfu "/dev/nand0.barebox.bb(barebox)sr,/dev/nand0.kernel.bb(kernel)r,/dev/nand0.root.bb(root)r"
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On the host side, the tool `dfu-util <http://dfu-util.gnumonks.org/>`_ can be used
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to update the partitions. It is available for most distributions and typically
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supports the following options::
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dfu-util -h
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Usage: dfu-util [options] ...
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-h --help Print this help message
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-V --version Print the version number
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-v --verbose Print verbose debug statements
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-l --list List the currently attached DFU capable USB devices
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-e --detach Detach the currently attached DFU capable USB devices
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-d --device vendor:product Specify Vendor/Product ID of DFU device
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-p --path bus-port. ... .port Specify path to DFU device
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-c --cfg config_nr Specify the Configuration of DFU device
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-i --intf intf_nr Specify the DFU Interface number
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-a --alt alt Specify the Altsetting of the DFU Interface
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by name or by number
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-t --transfer-size Specify the number of bytes per USB Transfer
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-U --upload file Read firmware from device into <file>
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-D --download file Write firmware from <file> into device
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-R --reset Issue USB Reset signalling once we're finished
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-s --dfuse-address address ST DfuSe mode, specify target address for
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raw file download or upload. Not applicable for
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DfuSe file (.dfu) downloads
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To update the kernel for the above example, you would use something like
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the following:
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.. code-block:: sh
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dfu-util -D arch/arm/boot/zImage -a kernel
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The ``dfu-util`` command automatically finds DFU-capable devices. If there are
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multiple devices found, you need to identify one with the ``-d``/``-p`` options.
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