Building Embedded Linux UDOONEO
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Yocto is an open source project that provides tools and methods to create custom Linux-based systems for embedded devices. It uses a build system and configuration files to generate a customized root filesystem containing packages and tools specific to the target hardware. Users can create their own software layers and recipes to build new packages or customize existing ones.
Building Embedded Linux UDOONEO
- 1. Yocto – UDOO NEO Embedded Linux
- 2. Yocto is ? • Not an embedded linux distribution, creates the a custom one • Widely adopted throughout the embedded / IoT industry • An open source and supports many CPU Hardware Architecture • Easy to migrate to another architecture • Constantly validated by testing all the releases • Designed for constraint embedded / IoT device needs • Provides the comprehensive set of toolchain capabilities • Allows to build / rebuild the individual packages separately • Can be configured for any device based on its flash, ram size
- 3. Yocto Layer OpenEmbedded Core Metadata ( oe-core ) Yocto Layer Meta-Data (meta-yocto) Hardware Specific BSP Layer UI (Optional Layer) Commercial Layer Development Specific Layer
- 5. Yocto Releases Releases Code Name Poky Version Yoco Project 2.5 Sumo 19.0 Yoco Project 2.4 Rocko 18.0 Yoco Project 2.3 Pyro 17.0 Yoco Project 2.2 Morty 16.0 Yoco Project 2.1 Krogoth 15.0 Yoco Project 2.0 Jethro 14.0 Yoco Project 1.8 Fido 13.0 Yoco Project 1.7 Dizzy 12.0 Yoco Project 1.6 Daisy 11.0 Yoco Project 1.5 Dora 10.0 Yoco Project 1.4 Dylan 9.0
- 6. Bitbake • Package management tool used by Gentoo Linux System. • Standalone, maintained and distribution independent tool • make-like software building tool for embedded linux systems. • Creates complete image consisting of root file system, linux kernel and bootloader. • Receipe • Specify how a particular package built • Consist of source URL (https, http, ftp, cvs, svn, git, local file system) • Used to resolve the package dependencies • Native or cross-compilation of software packages • Does the installation of packages on appropriate file locations
- 7. Recipes – Basic Tasks Tasks Function Description FETCH do_fetch Locate and Download the source code UNPACK do_unpack Unpack the source into working directory PATCH do_patch Apply any patches CONFIGURE do_configure Performs the pre-build configuration, if any COMPILE do_compile Compile the source code INSTALL do_install Install the resulting build into Working dir POPULATE_SYSROOT do_populate_sysroot Copy artifacts into sysroot PACKAGE do_package Create binary packages
- 8. Yocto Building for UDOO NEO Source Downloading, Setup Environment and Image Generation
- 9. Repo • Is a tool built on top of git • Does not meant to replace git, it makes easier to work with git. • Manages many git repositories • Automates the process of downloading repositories. • Uploads to revision control systems like git. • Executable python script that can be used anywhere. • Install Repo Utility $ curl http://commondatastorage.googleapis.com/git-repo-downloads/repo > repo $ chmod a+x repo $ PATH=${PATH}:$(PWD)
- 10. Yocto on UDOO Neo Boards • Clone the BSP Sources $ mkdir udoo-neo-yocto $ cd udoo-neo-yocto $ repo init -u https://github.com/graugans/fsl-community-bsp-platform -b krogoth $ repo sync • Prepare the Build Environment $ MACHINE=udooneo source ./setup-environment build
- 11. Yocto on UDOO Neo Boards • Fix the Layer setup (conf/bblayer.conf) ${BSPDIR}/sources/poky/meta-yocto ${BSPDIR}/sources/meta-openembedded/meta-oe + ${BSPDIR}/sources/meta-openembedded/meta-python + ${BSPDIR}/sources/meta-openembedded/meta-networking ${BSPDIR}/sources/meta-openembedded/meta-multimedia ${BSPDIR}/sources/meta-fsl-arm + ${BSPDIR}/sources/meta-udoo • Build the command line image $ MACHINE=udooneo bitbake udoo-image-full-cmdline • Creating a SD Card Image $ wic create udoo-sdcard -e udoo-image-full-cmdline -o /var/tmp/wic/udooneo • Writing into Micro SD Card $ sudo dd if=/tmp/wic/udooneo/build/udoo-sdcard-201804081228-mmcblk.direct of=/dev/sdX bs=1M
- 12. Yocto Receipe Creating, Configuring, Building new receipe
- 13. Create New Layer • Prepare the Build Environment $ MACHINE=udooneo source ./setup-environment build • Create Example layer $ cd ../sources $yocto-layer create mylayer
- 14. bblayer.conf • build/conf/bblayer.conf POKY_BBLAYERS_CONF_VERSION = "2" BBPATH = "${TOPDIR}" BSPDIR := "${@os.path.abspath(os.path.dirname(d.getVar('FILE', True)) + '/../..')}" BBFILES ?= "" BBLAYERS = " ${BSPDIR}/sources/poky/meta ${BSPDIR}/sources/poky/meta-poky ${BSPDIR}/sources/meta-openembedded/meta-oe ${BSPDIR}/sources/meta-openembedded/meta-python ${BSPDIR}/sources/meta-openembedded/meta-networking ${BSPDIR}/sources/meta-openembedded/meta-multimedia ${BSPDIR}/sources/meta-fsl-arm ${BSPDIR}/sources/meta-udoo ${BSPDIR}/sources/meta-fsl-arm-extra ${BSPDIR}/sources/meta-fsl-demos ${BSPDIR}/sources/meta-mylayer "
- 15. layer.conf • sources/meta-myrecipe/conf/layer.conf # We have a conf and classes directory, add to BBPATH BBPATH .= ":${LAYERDIR}" # We have recipes-* directories, add to BBFILES BBFILES += "${LAYERDIR}/recipes-*/*/*.bb ${LAYERDIR}/recipes-*/*/*.bbappend" BBFILE_COLLECTIONS += "myrecipe" BBFILE_PATTERN_myrecipe = "^${LAYERDIR}/" BBFILE_PRIORITY_myrecipe = "6"
- 16. myexample_0.1.bb • sources/meta-myrecipe/recipes-example/example/myexample_0.1.bb # # This file was derived from the 'Hello World!' example recipe in the # Yocto Project Development Manual. # SUMMARY = "Simple helloworld application" SECTION = "examples" LICENSE = "MIT" LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda2f7b4f302" SRC_URI = "file://helloworld.c" S = "${WORKDIR}" do_compile() { ${CC} helloworld.c -o helloworld } do_install() { install -d ${D}${bindir} install -m 0755 helloworld ${D}${bindir} }
- 17. Web : www.neeveetech.com E-Mail : [email protected] Thank You. Subscribe for updates