fastboot: Update fastboot documentation

Update fastboot documentation to reflect merged USB/UDP implementation.

Signed-off-by: Alex Kiernan <alex.kiernan@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Alex Kiernan 2018-05-29 15:30:56 +00:00 committed by Marek Vasut
parent 65c96757fe
commit 277b1333b7

View file

@ -1,142 +1,214 @@
================
Android Fastboot
~~~~~~~~~~~~~~~~
================
Overview
========
The protocol that is used over USB is described in
README.android-fastboot-protocol in same directory.
The current implementation is a minimal support of the erase command,the
"oem format" command and flash command;it only supports eMMC devices.
The protocol that is used over USB and UDP is described in the
``README.android-fastboot-protocol`` file in the same directory.
The current implementation supports the following standard commands:
- ``boot``
- ``continue``
- ``download``
- ``erase`` (if enabled)
- ``flash`` (if enabled)
- ``getvar``
- ``reboot``
- ``reboot-bootloader``
- ``set_active`` (only a stub implementation which always succeeds)
The following OEM commands are supported (if enabled):
- oem format - this executes ``gpt write mmc %x $partitions``
Support for both eMMC and NAND devices is included.
Client installation
===================
The counterpart to this gadget is the fastboot client which can
be found in Android's platform/system/core repository in the fastboot
folder. It runs on Windows, Linux and even OSX. Linux user are lucky since
they only need libusb.
Windows users need to bring some time until they have Android SDK (currently
http://dl.google.com/android/installer_r12-windows.exe) installed. You
need to install ADB package which contains the required glue libraries for
accessing USB. Also you need "Google USB driver package" and "SDK platform
tools". Once installed the usb driver is placed in your SDK folder under
extras\google\usb_driver. The android_winusb.inf needs a line like
%SingleBootLoaderInterface% = USB_Install, USB\VID_0451&PID_D022
The counterpart to this is the fastboot client which can be found in
Android's ``platform/system/core`` repository in the fastboot
folder. It runs on Windows, Linux and OSX. The fastboot client is
part of the Android SDK Platform-Tools and can be downloaded from:
either in the [Google.NTx86] section for 32bit Windows or [Google.NTamd64]
for 64bit Windows. VID and PID should match whatever the fastboot is
advertising.
https://developer.android.com/studio/releases/platform-tools
Board specific
==============
USB configuration
-----------------
The fastboot gadget relies on the USB download gadget, so the following
options must be configured:
CONFIG_USB_GADGET_DOWNLOAD
CONFIG_USB_GADGET_VENDOR_NUM
CONFIG_USB_GADGET_PRODUCT_NUM
CONFIG_USB_GADGET_MANUFACTURER
::
NOTE: The CONFIG_USB_GADGET_VENDOR_NUM must be one of the numbers supported by
the fastboot client. The list of vendor IDs supported can be found in the
fastboot client source code (fastboot.c) mentioned above.
CONFIG_USB_GADGET_DOWNLOAD
CONFIG_USB_GADGET_VENDOR_NUM
CONFIG_USB_GADGET_PRODUCT_NUM
CONFIG_USB_GADGET_MANUFACTURER
The fastboot function is enabled by defining CONFIG_USB_FUNCTION_FASTBOOT,
CONFIG_CMD_FASTBOOT and CONFIG_ANDROID_BOOT_IMAGE.
NOTE: The ``CONFIG_USB_GADGET_VENDOR_NUM`` must be one of the numbers
supported by the fastboot client. The list of vendor IDs supported can
be found in the fastboot client source code.
The fastboot protocol requires a large memory buffer for downloads. This
buffer should be as large as possible for a platform. The location of the
buffer and size are set with CONFIG_FASTBOOT_BUF_ADDR and
CONFIG_FASTBOOT_BUF_SIZE.
General configuration
---------------------
The fastboot protocol requires a large memory buffer for
downloads. This buffer should be as large as possible for a
platform. The location of the buffer and size are set with
``CONFIG_FASTBOOT_BUF_ADDR`` and ``CONFIG_FASTBOOT_BUF_SIZE``. These
may be overridden on the fastboot command line using ``-l`` and
``-s``.
Fastboot environment variables
==============================
Partition aliases
-----------------
Fastboot partition aliases can also be defined for devices where GPT
limitations prevent user-friendly partition names such as "boot", "system"
and "cache". Or, where the actual partition name doesn't match a standard
partition name used commonly with fastboot. Current implentation checks
aliases when accessing partitions by name (flash_write and erase functions).
To define a partition alias add an environment variable similar to:
fastboot_partition_alias_<alias partition name>=<actual partition name>
Example: fastboot_partition_alias_boot=LNX
partition name used commonly with fastboot.
The current implementation checks aliases when accessing partitions by
name (flash_write and erase functions). To define a partition alias
add an environment variable similar to:
``fastboot_partition_alias_<alias partition name>=<actual partition name>``
for example:
``fastboot_partition_alias_boot=LNX``
Variable overrides
------------------
Variables retrived through ``getvar`` can be overridden by defining
environment variables of the form ``fastboot.<variable>``. These are
looked up first so can be used to override values which would
otherwise be returned. Using this mechanism you can also return types
for NAND filesystems, as the fully parameterised variable is looked
up, e.g.
``fastboot.partition-type:boot=jffs2``
Boot command
------------
When executing the fastboot ``boot`` command, if ``fastboot_bootcmd`` is set then
that will be executed in place of ``bootm <CONFIG_FASTBOOT_BUF_ADDR>``.
Partition Names
===============
The Fastboot implementation in U-boot allows to write images into disk
partitions (currently on eMMC). Target partitions are referred on the host
computer by their names.
The Fastboot implementation in U-Boot allows to write images into disk
partitions. Target partitions are referred on the host computer by
their names.
For GPT/EFI the respective partition name is used.
For MBR the partitions are referred by generic names according to the
following schema:
<device type> <device index letter> <partition index>
<device type><device index letter><partition index>
Example: hda3, sdb1, usbda1
Example: ``hda3``, ``sdb1``, ``usbda1``
The device type is as follows:
* IDE, ATAPI and SATA disks: hd
* SCSI disks: sd
* USB media: usbd
* MMC and SD cards: mmcsd
* Disk on chip: docd
* other: xx
* IDE, ATAPI and SATA disks: ``hd``
* SCSI disks: ``sd``
* USB media: ``usbd``
* MMC and SD cards: ``mmcsd``
* Disk on chip: ``docd``
* other: ``xx``
The device index starts from 'a' and refers to the interface (e.g. USB
The device index starts from ``a`` and refers to the interface (e.g. USB
controller, SD/MMC controller) or disk index. The partition index starts
from 1 and describes the partition number on the particular device.
from ``1`` and describes the partition number on the particular device.
Writing Partition Table
=======================
Fastboot also allows to write the partition table to the media. This can be
done by writing the respective partition table image to a special target
"gpt" or "mbr". These names can be customized by defining the following
configuration options:
CONFIG_FASTBOOT_GPT_NAME
CONFIG_FASTBOOT_MBR_NAME
::
CONFIG_FASTBOOT_GPT_NAME
CONFIG_FASTBOOT_MBR_NAME
In Action
=========
Enter into fastboot by executing the fastboot command in u-boot and you
should see:
|GADGET DRIVER: usb_dnl_fastboot
Enter into fastboot by executing the fastboot command in U-Boot for either USB:
::
=> fastboot usb 0
or UDP:
::
=> fastboot udp
link up on port 0, speed 100, full duplex
Using ethernet@4a100000 device
Listening for fastboot command on 192.168.0.102
On the client side you can fetch the bootloader version for instance:
|>fastboot getvar bootloader-version
|bootloader-version: U-Boot 2014.04-00005-gd24cabc
|finished. total time: 0.000s
::
$ fastboot getvar bootloader-version
bootloader-version: U-Boot 2014.04-00005-gd24cabc
finished. total time: 0.000s
or initiate a reboot:
|>fastboot reboot
::
$ fastboot reboot
and once the client comes back, the board should reset.
You can also specify a kernel image to boot. You have to either specify
the an image in Android format _or_ pass a binary kernel and let the
the an image in Android format *or* pass a binary kernel and let the
fastboot client wrap the Android suite around it. On OMAP for instance you
take zImage kernel and pass it to the fastboot client:
|>fastboot -b 0x80000000 -c "console=ttyO2 earlyprintk root=/dev/ram0
| mem=128M" boot zImage
|creating boot image...
|creating boot image - 1847296 bytes
|downloading 'boot.img'...
|OKAY [ 2.766s]
|booting...
|OKAY [ -0.000s]
|finished. total time: 2.766s
::
and on the gadget side you should see:
|Starting download of 1847296 bytes
|........................................................
|downloading of 1847296 bytes finished
|Booting kernel..
|## Booting Android Image at 0x81000000 ...
|Kernel load addr 0x80008000 size 1801 KiB
|Kernel command line: console=ttyO2 earlyprintk root=/dev/ram0 mem=128M
| Loading Kernel Image ... OK
|OK
|
|Starting kernel ...
$ fastboot -b 0x80000000 -c "console=ttyO2 earlyprintk root=/dev/ram0 mem=128M" boot zImage
creating boot image...
creating boot image - 1847296 bytes
downloading 'boot.img'...
OKAY [ 2.766s]
booting...
OKAY [ -0.000s]
finished. total time: 2.766s
and on the U-Boot side you should see:
::
Starting download of 1847296 bytes
........................................................
downloading of 1847296 bytes finished
Booting kernel..
## Booting Android Image at 0x81000000 ...
Kernel load addr 0x80008000 size 1801 KiB
Kernel command line: console=ttyO2 earlyprintk root=/dev/ram0 mem=128M
Loading Kernel Image ... OK
OK
Starting kernel ...