1. Download or Build Your Image

You need to have an image that you can run on your hardware device. You can either build that image from scratch or, if you are going to use hardware supported by AGL, you can download a ready-made image from the AGL Download Website site.

Downloading an image

For a look at the supported images, go to the AGL Download Website. You can explore that hierarchy and locate images based on the AGL release and the supported hardware.

The following list summarizes the pre-built image support:

  • Quick EMUlator (QEMU): QEMU is a generic, open source machine emulator and virtualizer. You can use QEMU as your “hardware” when you run an image built for the emulator. AGL supports QEMU images for 32 and 64-bit architectures for ARM and Intel devices.

  • DRA7xx Evaluation Module Platform: Texas Instruments Jacinto™ DRA7xx evaluation module platform helps speed up development efforts and reduces time-to-market for applications such as infotainment, reconfigurable digital cluster, or integrated digital cockpit.

  • DragonBoard 410C Development Board: QualComm’s DragonBoard™ 410c is its first development board based on a Qualcomm® Snapdragon™ 400 series processor. The credit-card sized board has advanced processing power, Wi-Fi, Bluetooth connectivity, and GPS. The board is based on the 64-bit Snapdragon 410E processor,

  • Intel Core i7 Boards: Intel offers a wide array of devices and boards. One such device that uses the Intel Core i7 board supported by AGL is the Intel® NUC Kit NUC7i7BNH. The board in this device uses a dual-core 7th Generation Intel Core i7 processor and Intel Turbo Boost Technology 2.0.

  • M3 Ultra Low-Cost Board: The MC3ULC is a Renesas R-Car Gen3 SOC development board. Depending on the SOC specialization, Renesas provides several classes of these boards. The “M” classification is for the “middle-end” version as compared to the “H” classification, which is a “high-end” version.

  • Raspberry Pi 3: The Raspberry Pi 3 uses a 1.4GHz 64-bit quad-core processor. The board features dual-band wireless LAN, Bluetooth 4.2/BLE, faster Ethernet, and Power-over-Ethernet support with separate PoE HAT.

If you want to use QEMU or you are developing an application for one the supported hardware board types, you might consider skipping the build step, which is described below, and just download your image.

As an example, suppose you want to download the 64-bit ARM-based image that you can emulate using QEMU. Furthermore, you are using the “Flounder” 6.0.0 AGL release. Go to the AGL Download Website site and follow these links:

flounder -> 6.0.0 -> qemuarm64 -> deploy -> images -> qemuarm64

From the list, you could download the Image-qemuarm64.bin image file.

Building an image

Building the image from scratch requires system preparation, build configuration, and then the build itself. Building an image for the first time can take many hours.

The following procedure describes how to build your image:

  1. Prepare Your System: Your system, known as a “build host” needs to meet some requirements in order to build images in the AGL environment. The “Preparing Your Build Host” section describes in detail how to make sure your system meets these requirements.

    In summary, do the following to prepare your system:

    • Be sure that your build system runs a modern version of a supported Linux Distribution. For a list of supported distributions, see the “Supported Linux Distributions” section in the Yocto Project Reference Manual.

      NOTE: Building images using AGL software leverages off the Yocto Project, which is an Open Source project used to create small, embedded distributions.

    • Be sure that you have updated versions of Tar, Git, Python, and the GNU Compiler Collection (GCC).

    • Install required packages on the build host. This list of packages depends on the particular Linux Distribution your build host uses. See the “Preparing Your Build Host” section for the packages you need to install for your specific distribution.

      NOTE: The definitive package requirements are documented in the “Required Packages for the Host Development System” section of the Yocto Project Reference Manual.

  2. Download the AGL source code: Getting the AGL source code involves creating an isolated work directory, securing the “repo” tool, and finally using Git to download the source code into a cloned local repository.

    Be sure to consider the source code version before downloading the source. If you want the cutting edge version of the AGL source code, download the “master” branch. Otherwise, download the latest stable AGL release.

    You can see example steps in the “Download AGL source code” section.

  3. Initialize the build environment: The build process assumes many environment variable settings, tools, tool locations, and file hierarchies. Once the AGL software is on your local system, you need to run the build setup script (i.e. aglsetup.sh) to establish environment variables and paths used during the build process.

    Because the script accepts options that define the features used in your build environment, you need to understand what features you want before running the script. For information on running the script and on the features you can choose, see the “Initializing Your Build Environment” section.

  4. Customize your build configuration: Aside from environment variables and parameters, build parameters and variables need to be defined before you start the build process. These parameters (configurations) are defined in the local.conf configuration file. In general, the defaults in that file are good enough. However, you can customize aspects by editing the local.conf file. See the “Customizing Your Build” section for the location of the file and a list of common customizations.

    NOTE: For detailed explanations of the configurations you can make in the local.conf file, consult the Yocto Project Documentation.

  5. Building the image: You use BitBake to build the image. BitBake is the engine used by the Yocto Project when building images. The command used to build the image is bitbake.

    For example, the following command builds the image for the AGL demo platform, which is an image you can emulate using QEMU:

    $ bitbake agl-demo-platform
    

    As previously mentioned, building a new image can take a long time. An initial build could take hours. Once the image has been initially built, re-builds are much quicker as BitBake takes advantage of cached artifacts.

    The build image resides in the deployment area of the build directory. For example, Assuming your top-level AGL directory is ~/workspace_agl, you find the image here:

    ~/workspace_agl/build/tmp/deploy/images/qemux86-64/agl-demo-platform-qemux86-64.vmdk.xz