mirror of
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078beafb2d
It is far too easy to forget to set FWUPD_DEVICE_FLAG_NO_GUID_MATCHING for new
plugins, and without it it all works really well *until* a user has two devices
of the same type installed at the same time and then one 'disappears' for hard
to explain reasons. Typically we only need it for replug anyway!
Explicitly opt-in to this rarely-required behaviour, with the default to just
use the physical and logical IDs. Also document the update behavior for each
plugin to explain why the flag is being used.
This allows you to have two identical Unifying plugged in without one of them
being hidden from the user, at the same time allowing a HIDRAW<->USB transition
when going to and from bootloader and runtime modes.
This removes the workaround added in 99eb3f06b6.
Fixes https://github.com/fwupd/fwupd/issues/2915
59 lines
1.9 KiB
Markdown
59 lines
1.9 KiB
Markdown
DFU Support
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===========
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Introduction
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------------
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Device Firmware Update is a standard that allows USB devices to be easily and
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safely updated by any operating system.
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Firmware Format
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---------------
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The daemon will decompress the cabinet archive and extract a firmware blob in
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DFU or DfuSe file format.
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This plugin supports the following protocol IDs:
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* org.usb.dfu
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* com.st.dfuse
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GUID Generation
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---------------
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These devices use the standard USB DeviceInstanceId values, e.g.
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* `USB\VID_273F&PID_1003&REV_0001`
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* `USB\VID_273F&PID_1003`
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* `USB\VID_273F`
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Update Behavior
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---------------
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A DFU device usually presents in runtime mode (with optional DFU runtime), but
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on detach re-enumerates with an additional required DFU descriptor. On attach
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the device again re-enumerates back to the runtime mode.
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For this reason the `REPLUG_MATCH_GUID` internal device flag is used so that
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the bootloader and runtime modes are treated as the same device.
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Vendor ID Security
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------------------
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The vendor ID is set from the USB vendor, for example `USB:0x0A12`
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Quirk use
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---------
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This plugin uses the following plugin-specific quirks:
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| Quirk | Description | Minimum fwupd version |
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|------------------------|---------------------------------------------|-----------------------|
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|`DfuFlags` | Optional quirks for a DFU device which doesn't follow the DFU 1.0 or 1.1 specification | 1.0.1|
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|`DfuForceVersion` | Forces a specific DFU version for the hardware device. This is required if the device does not set, or sets incorrectly, items in the DFU functional descriptor. |1.0.1|
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|`DfuForceTimeout` | Forces a specific device timeout, in ms | 1.4.0 |
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|`DfuForceTransferSize` | Forces a target transfer size, in bytes | 1.5.6 |
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External interface access
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-------------------------
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This plugin requires read/write access to `/dev/bus/usb`.
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