Open Devices Wide Screen 2.0Open Devices Wide Screen 2.0

Open Devices

For some of the Xperia™ devices, we provide Android™ Open Source Project (AOSP) device configurations on GitHub. This means that the software will be open for you as a developer to use and contribute to. This is a way for us to support the open Android community, and it is also a tool for us to facilitate and verify contributions to AOSP.

Build AOSP Oreo 8.1

1Prepare your Java environment

To prevent errors generated by having the wrong version of Java installed on your computer, we will start by removing any conflicting Java version and adding the correct version. Java 8 is needed to build Android 8.x.x.

  1. On your computer: In a terminal window, enter the following command:
    sudo apt-get purge openjdk-* icedtea-* icedtea6-*
  2. A guide will appear on the screen. Follow the instructions to remove Java.
  3. Once Java is removed, install the correct version of Java by entering the following commands in a terminal window:
    sudo apt-get update
    sudo apt-get install openjdk-8-jdk
    java -version

    You should now see something similar to the following in your terminal window:

    java version "1.8.0_91"
    OpenJDK Runtime Environment (build 1.8.0_91-8u91-b14-0ubuntu4~14.04-b14)
    OpenJDK 64-Bit Server VM (build 25.91-b14, mixed mode)

2Install the necessary tools to make an Android build

To be able to build the images that you will later flash on your device, you need to install a set of software packages and libraries which give you the tools to compile source code into binary files that can run on your device.

  1. In a terminal window, enter the following commands, all at once:
    sudo apt-get install bison g++-multilib git gperf libxml2-utils make zlib1g-dev:i386 zip liblz4-tool libncurses5

Now you have the tools you need to compile and build a flashable AOSP image. Follow the steps below to learn how to do this.

3Download Repo tool and set PATH

In order to access and use the source code available on the Sonyxperiadev GitHub, you need to install the Repo tool that is provided by Google.

  1. In a terminal window, enter the following commands to download and install Repo, and set the right access rules for it:
    mkdir ~/bin
    curl http://commondatastorage.googleapis.com/git-repo-downloads/repo > ~/bin/repo
    chmod a+x ~/bin/repo
  2. Open the bashrc file included in the repo tool:
    sudo nano ~/.bashrc
  3. To set the right path for your local bin folder, paste the following code to a new line at the very bottom of the bashrc file, and then save the file using Ctrl+X:
    export PATH=~/bin:$PATH
  4. Reload bash variables to include the new path:
    source ~/.bashrc

Now you have all the tools you need and can move on to initializing the AOSP code and Xperia device configurations. Learn how to do this below!

4Initialise the AOSP tree

The next step is to create a folder on your computer, and then download the Android source code to it.  To do this, take note of the branch in the Build information and follow the steps below.

Build information:
  • security revision: Dec 2018
  • build: OPM7.181205.001
  • branch: android-8.1.0_r52

For more information, see Android Codenames, Tags, and Build Numbers.

 

  1. In a terminal window, enter the following commands:
    mkdir ~/android
    cd ~/android
    repo init -u https://android.googlesource.com/platform/manifest -b <branch>

    Note: The downloaded data is around 20 GB, and for a successful build you need 100 GB free hard disk space. Depending on your Internet connection, it can take quite a long time to download the source code. When the download has finished you have the basic AOSP source code on your computer.

  2. Clone the local_manifests from GitHub using the following commands:
    cd .repo
    git clone https://github.com/sonyxperiadev/local_manifests
    cd local_manifests
    git checkout <branch>
    cd ../..

    Note: These repos include a precompiled kernel. If you want to change or improve the kernel, you can recompile a new kernel. The new kernel binary should be placed in the corresponding device repository along with new kernel modules for wireless hardware. For more information, see the page how to rebuild kernels for Xperia devices.

  3. To download the code into the device repos created above, run the command:
    repo sync
  4. Cherry-pick the upstream patches
    ./repo_update.sh

5Build AOSP images that can be flashed

Now you are ready to build AOSP images that can be flashed to a device. To do this, you have to point out your specific device and then start building the images.

  1. Enter the following commands:
    source build/envsetup.sh && lunch
  2. When prompted, pick the number corresponding to your device in the list displayed and press enter.
  3. To start the build, type:
    make –j <insert the cpu thread number of your computer>

    This step will take a long time. It may take up to several hours, so go grab a coffee or play a game while you wait. When it’s done, AOSP images that can be flashed to a device will be ready.

6Flash AOSP image to your device

Before you flash the images that you built in the previous step, you must make sure your device is unlocked through Sony’s unlock boot loader service. Then you can flash the AOSP images on your device by following these steps:

  1. On your device: Connect the device to your computer in Fastboot mode, by pressing volume up while inserting the USB cable. When the device is in Fastboot mode, the LED on the device will be illuminated in blue.
  2. On your computer: Flash the boot, recovery, system and userdata images by entering the following commands in a terminal window:
    fastboot flash boot out/target/product/<device>/boot.img
    fastboot flash recovery out/target/product/<device>/recovery.img
    fastboot flash system out/target/product/<device>/system.img
    fastboot flash vendor out/target/product/<device>/vendor.img
    fastboot flash userdata out/target/product/<device>/userdata.img

    Note: It’s not necessary to re-flash the userdata every time you flash your device, but sometimes the new software is incompatible with previous content, which might result in a device that doesn’t boot. If you experience this, try to re-flash only the userdata again.

    Note: Recovery.img or vendor.img images may be missing depending on device layout.

  3. Now when you disconnect your device from the computer and start it, it will be running AOSP.

7Flash vendor image to your device

  1. Download the vendor image corresponding your device from List of devices and resources.
  2. Unpack the vendor zip file to obtain the vendor image.
    unzip SW_binaries_for_Xperia_AOSP_O_MR0_4.4_<release version>_<platform>.zip

    Note: Release version should be equivalent to the latest downloaded image version, and platform should match your device.

  3. On your device: Connect the device to your computer in Fastboot mode, by pressing volume up while inserting the USB cable. When the device is in Fastboot mode, the LED on the device will be illuminated in blue.
  4. On your computer: Flash the vendor image by entering the following commands in a terminal window:
    fastboot flash oem SW_binaries_for_Xperia_AOSP_O_MR0_4.4_<release version>_<platform>.img

    Note: Release version should be equivalent to the latest downloaded image version, and platform should match your device.

We hope this tutorial will help you get started building your own version of Android for Xperia devices. Feel free to contribute your work back to our repositories on our Sonyxperiadev GitHub account. We will review and merge your code as soon as possible.