# Fastboot

## Introduction

This plugin is used to update hardware that uses the fastboot protocol.

## Firmware Format

The daemon will decompress the cabinet archive and extract a firmware blob in
ZIP file format. Inside the zip file must be all the firmware images for each
partition and a manifest file. The partition images can be in any format, but
the manifest must be either an Android `flashfile.xml` format file, or a QFIL
`partition_nand.xml` format file.

For both types, all partitions with a defined image found in the zip file will
be updated.

This plugin supports the following protocol ID:

* com.google.fastboot

## GUID Generation

These devices use the standard USB DeviceInstanceId values, e.g.

* `USB\VID_18D1&PID_4EE0&REV_0001`
* `USB\VID_18D1&PID_4EE0`
* `USB\VID_18D1`

## Update Behavior

A fastboot device usually presents in runtime mode (or with no interface),
but if the user puts the device into fastboot mode using a physical button
it then enumerates with a USB descriptor. On attach the device reboots to
runtime mode which *may* mean the device "goes away".

For this reason the `REPLUG_MATCH_GUID` internal device flag is used so that
the bootloader and runtime modes are treated as the same device.

## Quirk Use

This plugin uses the following plugin-specific quirk:

### FastbootBlockSize

Block size to use for transfers.

Since: 1.2.2

## Vendor ID Security

The vendor ID is set from the USB vendor, for example `USB:0x18D1`

## External Interface Access

This plugin requires read/write access to `/dev/bus/usb`.