183cbff706
The Android fastboot client only communicates with specific vendor IDs. This addition to the documentation points out that fact so everyone is aware that not just any vendor ID will work and where to find the IDs that will. Signed-off-by: Clifton Barnes <cabarnes@indesign-llc.com> Cc: Rob Herring <robh@kernel.org>
96 lines
3.2 KiB
Plaintext
96 lines
3.2 KiB
Plaintext
Android Fastboot
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~~~~~~~~~~~~~~~~
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Overview
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========
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The protocol that is used over USB is described in
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README.android-fastboot-protocol in same directory.
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The current implementation does not yet support the flash and erase
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commands.
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Client installation
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===================
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The counterpart to this gadget is the fastboot client which can
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be found in Android's platform/system/core repository in the fastboot
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folder. It runs on Windows, Linux and even OSX. Linux user are lucky since
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they only need libusb.
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Windows users need to bring some time until they have Android SDK (currently
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http://dl.google.com/android/installer_r12-windows.exe) installed. You
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need to install ADB package which contains the required glue libraries for
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accessing USB. Also you need "Google USB driver package" and "SDK platform
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tools". Once installed the usb driver is placed in your SDK folder under
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extras\google\usb_driver. The android_winusb.inf needs a line like
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%SingleBootLoaderInterface% = USB_Install, USB\VID_0451&PID_D022
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either in the [Google.NTx86] section for 32bit Windows or [Google.NTamd64]
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for 64bit Windows. VID and PID should match whatever the fastboot is
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advertising.
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Board specific
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==============
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The fastboot gadget relies on the USB download gadget, so the following
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options must be configured:
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CONFIG_USBDOWNLOAD_GADGET
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CONFIG_G_DNL_VENDOR_NUM
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CONFIG_G_DNL_PRODUCT_NUM
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CONFIG_G_DNL_MANUFACTURER
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NOTE: The CONFIG_G_DNL_VENDOR_NUM must be one of the numbers supported by
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the fastboot client. The list of vendor IDs supported can be found in the
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fastboot client source code (fastboot.c) mentioned above.
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The fastboot function is enabled by defining CONFIG_CMD_FASTBOOT and
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CONFIG_ANDROID_BOOT_IMAGE.
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The fastboot protocol requires a large memory buffer for downloads. This
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buffer should be as large as possible for a platform. The location of the
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buffer and size are set with CONFIG_USB_FASTBOOT_BUF_ADDR and
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CONFIG_USB_FASTBOOT_BUF_SIZE.
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In Action
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=========
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Enter into fastboot by executing the fastboot command in u-boot and you
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should see:
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|GADGET DRIVER: usb_dnl_fastboot
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On the client side you can fetch the bootloader version for instance:
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|>fastboot getvar bootloader-version
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|bootloader-version: U-Boot 2014.04-00005-gd24cabc
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|finished. total time: 0.000s
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or initiate a reboot:
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|>fastboot reboot
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and once the client comes back, the board should reset.
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You can also specify a kernel image to boot. You have to either specify
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the an image in Android format _or_ pass a binary kernel and let the
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fastboot client wrap the Android suite around it. On OMAP for instance you
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take zImage kernel and pass it to the fastboot client:
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|>fastboot -b 0x80000000 -c "console=ttyO2 earlyprintk root=/dev/ram0
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| mem=128M" boot zImage
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|creating boot image...
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|creating boot image - 1847296 bytes
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|downloading 'boot.img'...
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|OKAY [ 2.766s]
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|booting...
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|OKAY [ -0.000s]
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|finished. total time: 2.766s
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and on the gadget side you should see:
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|Starting download of 1847296 bytes
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|........................................................
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|downloading of 1847296 bytes finished
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|Booting kernel..
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|## Booting Android Image at 0x81000000 ...
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|Kernel load addr 0x80008000 size 1801 KiB
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|Kernel command line: console=ttyO2 earlyprintk root=/dev/ram0 mem=128M
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| Loading Kernel Image ... OK
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|OK
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|Starting kernel ...
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