8/3/2023 0 Comments U boot yocto![]() You will see the linux kernel booting and eventually you will reach linux asking for the login username. ![]() To run the image on qemu you can simply run the following command: $ runqemu qemuarm nographic You can try different images like core-image-sato that has a GUI and is fully baked image but I don't need that.Īfter the build is complete you will have the output images in dir: /build-virt/tmp/deploy/images/qemuarm/ It will vary depending on your machine and internet connection. The build process took about 3 hours on my machine. This minimal image contains a very minimal set of commands and binaries and have minimal size suitable for embedded systems. The following command will start the build process for the core-image-minimal image for our target. Tip2: Do the same with SSTATE_DIR to share caches between builds. Tip: uncomment the line starting with DL_DIR and change it to a directory outside the build directory so the downloads are shared across different build environments. We will uncomment the line 'MACHINE ?= "qemuarm"' to select qemu-arm as the target for the build instead of the qemu-0x86-64 target. Later, when the build completes, the Build Directory contains all the files created during the build.įrom within the build directory, open file conf/nf and take a look into it. After the script runs, your current working directory is set to the Build Directory. $ cd pokyĪmong other things, the script creates the Build Directory, which is build-virt in this case and is located in the Source Directory. It is so simple!įrom within the poky directory, run the oe-init-build-env environment setup script to define Yocto Project’s build environment on your build host. While this is not our intended target, let's start by building for the default qemu target virt. This will checkout v3.1.4 tag into a new branch 'yocto-3.1.4-local' Building sample image for virt target The current release of dunfell is 3.1.4: $ git checkout tags/yocto-3.1.4 -b yocto-3.1.4-local I choose the LTS (long time support) version codenamed 'dunfell'. Move to the poky directory and checkout the desired tag/branch We will start by fetching poky from yocto's git repo $ git clone git:///poky If you are running another distro head to Yocto documentation to know how to install the required packages on your machine: Downloading Poky You must install these packages on your host to be able to run yocto $ sudo apt-get install gawk wget git-core diffstat unzip texinfo gcc-multilib build-essential chrpath socat cpio python3 python3-pip python3-pexpect xz-utils debianutils iputils-ping python3-git python3-jinja2 libegl1-mesa libsdl1.2-dev pylint3 xterm python3-subunit mesa-common-dev Installing required packages to run yocto You will need a build host machine running a modern linux distro, more than 50GB of free disk available and a fast internet connection. We will go through the process of adding the required bsp to build poky with our chosen target. This one models real hardware with SD Card memory as the only storage option available. I choose the QEMU vexpress-a9 target which is a model of Arm Versatile Express development board. ![]() However, that board is not interesting for me to play with since I will not gain any knowledge in creating a bsp (board support package) for real hardware targets. It supports modern buses and peripherals like PCI and PCIe. The virt machine is a modern virtual platform that does not correspond to any real hardware. Poky supports QEMU by default and already has the required recipes for the 'virt' target. Poky is a distribution provided by the Yocto project that provides a base level functional distro and build system which can be used to illustrate how to customize a distro as well as being a good starting point for your own custom distro. In this article I will go through the process of building an image for the vexpress-a9 target and all the additional tools and configurations needed to make the final image as close as possible to how a real hardware platform will look like. The project provides a standard to deliver hardware support or software stack in a scalable way.Ī recipe contains configurations and patches required to cross-compile, install and deploy a component in the final build. It is configured by a set of recipes contained in a set of layers. The Yocto project is a build system that cross-compiles your custom embedded linux distribution without the hassle of building every component (bootloader, kernel, device tree, root filesystem, c library and so on) by yourself.
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