Yocto Project Reference Manual

Table of Contents

• 1 System Requirements
  • 1.1 Minimum Free Disk Space
  • 1.2 Minimum System RAM
  • 1.3 Supported Linux Distributions
  • 1.4 Required Packages for the Build Host
    • 1.4.1 Ubuntu and Debian
    • 1.4.2 Fedora Packages
    • 1.4.3 openSUSE Packages
    • 1.4.4 AlmaLinux Packages
  • 1.5 Required Git, tar, Python, make and gcc Versions
    • 1.5.1 Installing a Pre-Built buildtools Tarball with install-buildtools script
    • 1.5.2 Downloading a Pre-Built buildtools Tarball
    • 1.5.3 Building Your Own buildtools Tarball
• 2 Yocto Project Terms
• 3 Yocto Project Releases and the Stable Release Process
  • 3.1 Major and Minor Release Cadence
  • 3.2 Major Release Codenames
  • 3.3 Stable Release Process
  • 3.4 Long Term Support Releases
  • 3.5 Testing and Quality Assurance
• 4 Source Directory Structure
  • 4.1 Top-Level Core Components
    • 4.1.1 bitbake/
    • 4.1.2 build/
    • 4.1.3 documentation/
    • 4.1.4 meta/
    • 4.1.5 meta-poky/
    • 4.1.6 meta-yocto-bsp/
    • 4.1.7 meta-selftest/
    • 4.1.8 meta-skeleton/
    • 4.1.9 scripts/
    • 4.1.10 oe-init-build-env
    • 4.1.11 LICENSE, README, and README.hardware
  • 4.2 The Build Directory — build/
    • 4.2.1 build/buildhistory/
    • 4.2.2 build/cache/
    • 4.2.3 build/conf/local.conf
    • 4.2.4 build/conf/bblayers.conf
    • 4.2.5 build/downloads/
    • 4.2.6 build/sstate-cache/
    • 4.2.7 build/tmp/
      • 4.2.7.1 build/tmp/buildstats/
      • 4.2.7.2 build/tmp/cache/
      • 4.2.7.3 build/tmp/deploy/
        • 4.2.7.3.1 build/tmp/deploy/deb/
        • 4.2.7.3.2 build/tmp/deploy/rpm/
        • 4.2.7.3.3 build/tmp/deploy/ipk/
        • 4.2.7.3.4 build/tmp/deploy/licenses/
        • 4.2.7.3.5 build/tmp/deploy/images/
        • 4.2.7.3.6 build/tmp/deploy/sdk/
      • 4.2.7.4 build/tmp/sstate-control/
      • 4.2.7.5 build/tmp/sysroots-components/
      • 4.2.7.6 build/tmp/sysroots/
      • 4.2.7.7 build/tmp/stamps/
      • 4.2.7.8 build/tmp/log/
      • 4.2.7.9 build/tmp/work/
        • 4.2.7.9.1 build/tmp/work/tunearch/recipename/version/
      • 4.2.7.10 build/tmp/work-shared/
  • 4.3 The Metadata — meta/
    • 4.3.1 meta/classes*/
    • 4.3.2 meta/conf/
      • 4.3.2.1 meta/conf/machine/
      • 4.3.2.2 meta/conf/distro/
      • 4.3.2.3 meta/conf/machine-sdk/
    • 4.3.3 meta/files/
    • 4.3.4 meta/lib/
    • 4.3.5 meta/recipes-bsp/
    • 4.3.6 meta/recipes-connectivity/
    • 4.3.7 meta/recipes-core/
    • 4.3.8 meta/recipes-devtools/
    • 4.3.9 meta/recipes-extended/
    • 4.3.10 meta/recipes-gnome/
    • 4.3.11 meta/recipes-graphics/
    • 4.3.12 meta/recipes-kernel/
    • 4.3.13 meta/recipes-multimedia/
    • 4.3.14 meta/recipes-rt/
    • 4.3.15 meta/recipes-sato/
    • 4.3.16 meta/recipes-support/
    • 4.3.17 meta/site/
    • 4.3.18 meta/recipes.txt
• 5 Classes
  • 5.1 allarch
  • 5.2 archiver
  • 5.3 autotools*
  • 5.4 base
  • 5.5 bash-completion
  • 5.6 bin_package
  • 5.7 binconfig
  • 5.8 binconfig-disabled
  • 5.9 buildhistory
  • 5.10 buildstats
  • 5.11 buildstats-summary
  • 5.12 cargo
  • 5.13 cargo_c
  • 5.14 cargo_common
  • 5.15 cargo-update-recipe-crates
  • 5.16 ccache
  • 5.17 chrpath
  • 5.18 cmake
  • 5.19 cmake-qemu
  • 5.20 cml1
  • 5.21 compress_doc
  • 5.22 copyleft_compliance
  • 5.23 copyleft_filter
  • 5.24 core-image
  • 5.25 cpan*
  • 5.26 create-spdx
  • 5.27 cross
  • 5.28 cross-canadian
  • 5.29 crosssdk
  • 5.30 cve-check
  • 5.31 debian
  • 5.32 deploy
  • 5.33 devicetree
  • 5.34 devshell
  • 5.35 devupstream
  • 5.36 externalsrc
  • 5.37 extrausers
  • 5.38 features_check
  • 5.39 fontcache
  • 5.40 fs-uuid
  • 5.41 gconf
  • 5.42 gettext
  • 5.43 github-releases
  • 5.44 gnomebase
  • 5.45 go
  • 5.46 go-mod
  • 5.47 go-vendor
  • 5.48 gobject-introspection
  • 5.49 grub-efi
  • 5.50 gsettings
  • 5.51 gtk-doc
  • 5.52 gtk-icon-cache
  • 5.53 gtk-immodules-cache
  • 5.54 gzipnative
  • 5.55 icecc
  • 5.56 image
  • 5.57 image-buildinfo
  • 5.58 image_types
  • 5.59 image-live
  • 5.60 insane
  • 5.61 kernel
  • 5.62 kernel-arch
  • 5.63 kernel-devicetree
  • 5.64 kernel-fitimage
  • 5.65 kernel-grub
  • 5.66 kernel-module-split
  • 5.67 kernel-uboot
  • 5.68 kernel-uimage
  • 5.69 kernel-yocto
  • 5.70 kernelsrc
  • 5.71 lib_package
  • 5.72 libc*
  • 5.73 license
  • 5.74 linux-kernel-base
  • 5.75 linuxloader
  • 5.76 logging
  • 5.77 meson
  • 5.78 metadata_scm
  • 5.79 migrate_localcount
  • 5.80 mime
  • 5.81 mime-xdg
  • 5.82 mirrors
  • 5.83 module
  • 5.84 module-base
  • 5.85 multilib*
  • 5.86 native
  • 5.87 nativesdk
  • 5.88 nopackages
  • 5.89 npm
  • 5.90 oelint
  • 5.91 overlayfs
  • 5.92 overlayfs-etc
  • 5.93 own-mirrors
  • 5.94 package
  • 5.95 package_deb
  • 5.96 package_ipk
  • 5.97 package_rpm
  • 5.98 packagedata
  • 5.99 packagegroup
  • 5.100 patch
  • 5.101 perlnative
  • 5.102 pypi
  • 5.103 python_flit_core
  • 5.104 python_maturin
  • 5.105 python_mesonpy
  • 5.106 python_pep517
  • 5.107 python_poetry_core
  • 5.108 python_pyo3
  • 5.109 python-setuptools3_rust
  • 5.110 pixbufcache
  • 5.111 pkgconfig
  • 5.112 populate_sdk
  • 5.113 populate_sdk_*
  • 5.114 prexport
  • 5.115 primport
  • 5.116 prserv
  • 5.117 ptest
  • 5.118 ptest-cargo
  • 5.119 ptest-gnome
  • 5.120 python3-dir
  • 5.121 python3native
  • 5.122 python3targetconfig
  • 5.123 qemu
  • 5.124 recipe_sanity
  • 5.125 relocatable
  • 5.126 remove-libtool
  • 5.127 report-error
  • 5.128 rm_work
  • 5.129 rootfs*
  • 5.130 rust
  • 5.131 rust-common
  • 5.132 sanity
  • 5.133 scons
  • 5.134 sdl
  • 5.135 python_setuptools_build_meta
  • 5.136 setuptools3
  • 5.137 setuptools3_legacy
  • 5.138 setuptools3-base
  • 5.139 sign_rpm
  • 5.140 siteconfig
  • 5.141 siteinfo
  • 5.142 sstate
  • 5.143 staging
  • 5.144 syslinux
  • 5.145 systemd
  • 5.146 systemd-boot
  • 5.147 terminal
  • 5.148 testimage
  • 5.149 testsdk
  • 5.150 texinfo
  • 5.151 toaster
  • 5.152 toolchain-scripts
  • 5.153 typecheck
  • 5.154 uboot-config
  • 5.155 uboot-sign
  • 5.156 uninative
  • 5.157 update-alternatives
  • 5.158 update-rc.d
  • 5.159 useradd*
  • 5.160 utility-tasks
  • 5.161 utils
  • 5.162 vala
  • 5.163 waf
• 6 Tasks
  • 6.1 Normal Recipe Build Tasks
    • 6.1.1 do_build
    • 6.1.2 do_compile
    • 6.1.3 do_compile_ptest_base
    • 6.1.4 do_configure
    • 6.1.5 do_configure_ptest_base
    • 6.1.6 do_deploy
    • 6.1.7 do_fetch
    • 6.1.8 do_image
    • 6.1.9 do_image_complete
    • 6.1.10 do_install
    • 6.1.11 do_install_ptest_base
    • 6.1.12 do_package
    • 6.1.13 do_package_qa
    • 6.1.14 do_package_write_deb
    • 6.1.15 do_package_write_ipk
    • 6.1.16 do_package_write_rpm
    • 6.1.17 do_packagedata
    • 6.1.18 do_patch
    • 6.1.19 do_populate_lic
    • 6.1.20 do_populate_sdk
    • 6.1.21 do_populate_sdk_ext
    • 6.1.22 do_populate_sysroot
    • 6.1.23 do_prepare_recipe_sysroot
    • 6.1.24 do_rm_work
    • 6.1.25 do_unpack
  • 6.2 Manually Called Tasks
    • 6.2.1 do_checkuri
    • 6.2.2 do_clean
    • 6.2.3 do_cleanall
    • 6.2.4 do_cleansstate
    • 6.2.5 do_pydevshell
    • 6.2.6 do_devshell
    • 6.2.7 do_listtasks
    • 6.2.8 do_package_index
  • 6.3 Image-Related Tasks
    • 6.3.1 do_bootimg
    • 6.3.2 do_bundle_initramfs
    • 6.3.3 do_rootfs
    • 6.3.4 do_testimage
    • 6.3.5 do_testimage_auto
  • 6.4 Kernel-Related Tasks
    • 6.4.1 do_compile_kernelmodules
    • 6.4.2 do_diffconfig
    • 6.4.3 do_kernel_checkout
    • 6.4.4 do_kernel_configcheck
    • 6.4.5 do_kernel_configme
    • 6.4.6 do_kernel_menuconfig
    • 6.4.7 do_kernel_metadata
    • 6.4.8 do_menuconfig
    • 6.4.9 do_savedefconfig
    • 6.4.10 do_shared_workdir
    • 6.4.11 do_sizecheck
    • 6.4.12 do_strip
    • 6.4.13 do_validate_branches
• 7 devtool Quick Reference
  • 7.1 Getting Help
  • 7.2 The Workspace Layer Structure
  • 7.3 Adding a New Recipe to the Workspace Layer
  • 7.4 Extracting the Source for an Existing Recipe
  • 7.5 Synchronizing a Recipe’s Extracted Source Tree
  • 7.6 Modifying an Existing Recipe
  • 7.7 Edit an Existing Recipe
  • 7.8 Updating a Recipe
  • 7.9 Checking on the Upgrade Status of a Recipe
  • 7.10 Upgrading a Recipe
  • 7.11 Resetting a Recipe
  • 7.12 Building Your Recipe
  • 7.13 Building Your Image
  • 7.14 Deploying Your Software on the Target Machine
  • 7.15 Removing Your Software from the Target Machine
  • 7.16 Creating the Workspace Layer in an Alternative Location
  • 7.17 Get the Status of the Recipes in Your Workspace
  • 7.18 Search for Available Target Recipes
• 8 OpenEmbedded Kickstart (.wks) Reference
  • 8.1 Introduction
  • 8.2 Command: part or partition
  • 8.3 Command: bootloader
• 9 QA Error and Warning Messages
  • 9.1 Introduction
  • 9.2 Errors and Warnings
  • 9.3 Configuring and Disabling QA Checks
• 10 Images
• 11 Features
  • 11.1 Machine Features
  • 11.2 Distro Features
  • 11.3 Image Features
  • 11.4 Feature Backfilling
• 12 Variables Glossary
• 13 Variable Context
  • 13.1 Configuration
    • 13.1.1 Distribution (Distro)
    • 13.1.2 Machine
    • 13.1.3 Local
  • 13.2 Recipes
    • 13.2.1 Required
    • 13.2.2 Dependencies
    • 13.2.3 Paths
    • 13.2.4 Extra Build Information
• 14 FAQ
  • 14.1 General questions
    • 14.1.1 How does Poky differ from OpenEmbedded?
    • 14.1.2 How can you claim Poky / OpenEmbedded-Core is stable?
    • 14.1.3 Are there any products built using the OpenEmbedded build system?
  • 14.2 Building environment
    • 14.2.1 Missing dependencies on the development system?
    • 14.2.2 How does OpenEmbedded fetch source code? Will it work through a firewall or proxy server?
  • 14.3 Using the OpenEmbedded Build system
    • 14.3.1 How do I use an external toolchain?
    • 14.3.2 Why do I get chmod permission issues?
    • 14.3.3 I see many 404 errors trying to download sources. Is anything wrong?
    • 14.3.4 Why do I get random build failures?
    • 14.3.5 Why does the build fail with iconv.h problems?
    • 14.3.6 Why don’t other recipes find the files provided by my *-native recipe?
    • 14.3.7 Can I get rid of build output so I can start over?
  • 14.4 Customizing generated images
    • 14.4.1 What does the OpenEmbedded build system produce as output?
    • 14.4.2 How do I make the Yocto Project support my board?
    • 14.4.3 How do I make the Yocto Project support my package?
    • 14.4.4 What do I need to ship for license compliance?
    • 14.4.5 Do I have to make a full reflash after recompiling one package?
    • 14.4.6 How to prevent my package from being marked as machine specific?
    • 14.4.7 What’s the difference between target and target-native?
    • 14.4.8 Why do ${bindir} and ${libdir} have strange values for -native recipes?
    • 14.4.9 How do I create images with more free space?
    • 14.4.10 Why aren’t spaces in path names supported?
    • 14.4.11 I’m adding a binary in a recipe. Why is it different in the image?
  • 14.5 Issues on the running system
    • 14.5.1 How do I disable the cursor on my touchscreen device?
    • 14.5.2 How to always bring up connected network interfaces?
• 15 Contributions and Additional Information
  • 15.1 Introduction
  • 15.2 Contributions
  • 15.3 Yocto Project Bugzilla
  • 15.4 Mailing lists
  • 15.5 Internet Relay Chat (IRC)
  • 15.6 Links and Related Documentation

---

The Yocto Project ®

<docs@lists.yoctoproject.org>

Permission is granted to copy, distribute and/or modify this document under the terms of the Creative Commons Attribution-Share Alike 2.0 UK: England & Wales as published by Creative Commons.

To report any inaccuracies or problems with this (or any other Yocto Project) manual, or to send additions or changes, please send email/patches to the Yocto Project documentation mailing list at docs@lists.yoctoproject.org or log into the Libera Chat #yocto channel.