path: root/meta/conf/documentation.conf

# this file holds documentation for known keys, possible values and
# their meanings. Please update, correct and extend this documentation.
# Mail your changes to openembedded-devel@openembedded.org

# DESCRIPTIONS FOR TASKS #

do_bootimg[doc] = "Creates a bootable live image"
do_build[doc] = "Default task for a recipe - depends on all other normal tasks required to 'build' a recipe"
do_bundle_initramfs[doc] = "Combines an initial ramdisk image and kernel together to form a single image"
do_checkuri[doc] = "Validates the SRC_URI value"
do_checkuriall[doc] = "Validates the SRC_URI value for all recipes required to build a target"
do_clean[doc] = "Removes all output files for a target"
do_cleanall[doc] = "Removes all output files, shared state cache, and downloaded source files for a target"
do_cleansstate[doc] = "Removes all output files and shared state cache for a target"
do_compile[doc] = "Compiles the source in the compilation directory"
do_compile_kernelmodules[doc] = "Compiles loadable modules for the Linux kernel"
do_compile_ptest_base[doc] = "Compiles the runtime test suite included in the software being built"
do_configure[doc] = "Configures the source by enabling and disabling any build-time and configuration options for the software being built"
do_configure_ptest_base[doc] = "Configures the runtime test suite included in the software being built"
do_deploy[doc] = "Writes deployable output files to the deploy directory"
do_devpyshell[doc] = "Starts an interactive Python shell for development/debugging"
do_devshell[doc] = "Starts a shell with the environment set up for development/debugging"
do_diffconfig[doc] = "Compares the old and new config files after running do_menuconfig for the kernel"
do_fetch[doc] = "Fetches the source code"
do_fetchall[doc] = "Fetches all remote sources required to build a target"
do_install[doc] = "Copies files from the compilation directory to a holding area"
do_install_ptest_base[doc] = "Copies the runtime test suite files from the compilation directory to a holding area"
do_kernel_checkout[doc] = "Checks out source/meta branches for a linux-yocto style kernel"
do_kernel_configcheck[doc] = "Validates the kernel configuration for a linux-yocto style kernel"
do_kernel_configme[doc] = "Assembles the kernel configuration for a linux-yocto style kernel"
do_kernel_link_images[doc] = "Creates a symbolic link in arch/$arch/boot for vmlinux and vmlinuz kernel images"
do_listtasks[doc] = "Lists all defined tasks for a target"
do_menuconfig[doc] = "Runs 'make menuconfig' for the kernel"
do_package[doc] = "Analyzes the content of the holding area and splits it into subsets based on available packages and files"
do_package_index[doc] = "Creates or updates the index in the Package Feed area"
do_package_qa[doc] = "Runs QA checks on packaged files"
do_package_write_deb[doc] = "Creates the actual DEB packages and places them in the Package Feed area"
do_package_write_ipk[doc] = "Creates the actual IPK packages and places them in the Package Feed area"
do_package_write_rpm[doc] = "Creates the actual RPM packages and places them in the Package Feed area"
do_package_write_tar[doc] = "Creates tar archives for packages and places them in the Package Feed area"
do_packagedata[doc] = "Creates package metadata used by the build system to generate the final packages"
do_patch[doc] = "Locates patch files and applies them to the source code"
do_populate_lic[doc] = "Writes license information for the recipe that is collected later when the image is constructed"
do_populate_sdk[doc] = "Creates the file and directory structure for an installable SDK"
do_populate_sysroot[doc] = "Copies a subset of files installed by do_install into the sysroot in order to make them available to other recipes"
do_rm_work[doc] = "Removes work files after the build system has finished with them"
do_rm_work_all[doc] = "Top-level task for removing work files after the build system has finished with them"
do_rootfs[doc] = "Creates the root filesystem (file and directory structure) for an image"
do_savedefconfig[doc] = "Creates a minimal Linux kernel configuration file"
do_sizecheck[doc] = "Checks the size of the kernel image against KERNEL_IMAGE_MAXSIZE (if set)"
do_spdx[doc] = "A build stage that takes the source code and scans it on a remote FOSSOLOGY server in order to produce an SPDX document"
do_strip[doc] = "Strips unneeded sections out of the Linux kernel image"
do_testimage[doc] = "Boots an image and performs runtime tests within the image"
do_testimage_auto[doc] = "Boots an image and performs runtime tests within the image immediately after it has been built"
do_testsdk[doc] = "Installs an SDK and performs runtime tests on the tools installed by it"
do_uboot_mkimage[doc] = "Creates a uImage file from the kernel for the U-Boot bootloader"
do_unpack[doc] = "Unpacks the source code into a working directory"
do_validate_branches[doc] = "Ensures that the source/meta branches are on the locations specified by their SRCREV values for a linux-yocto style kernel"
do_vmimg[doc] = "Creates an image for use with VMware or VirtualBox compatible virtual machine hosts (based on IMAGE_FSTYPES either .vmdk or .vdi)"

# DESCRIPTIONS FOR VARIABLES #

#A

ALLOW_EMPTY[doc] = "Specifies if an output package should still be produced if it is empty."
ALTERNATIVE[doc] = "Lists commands in a package that need an alternative binary naming scheme."
ALTERNATIVE_LINK_NAME[doc] = "Used by the alternatives system to map duplicated commands to actual locations."
ALTERNATIVE_PRIORITY[doc] = "Used by the alternatives system to create default priorities for duplicated commands."
ALTERNATIVE_TARGET[doc] = "Used by the alternatives system to create default link locations for duplicated commands."
ASSUME_PROVIDED[doc] = "List of packages (recipes actually) that are assumed to be implicitly available. BitBake does not build these packages."
ASSUME_SHLIBS[doc] = "List of shlib:package[_version] mappings. Useful for lib packages in ASSUME_PROVIDED, for which automatic shlib dependency tracking does not work."
AUTHOR[doc] = "Email address used to contact the original author(s) in order to send patches and forward bugs."
AUTO_SYSLINUXMENU[doc] = "Enables creating an automatic menu for the syslinux bootloader."
AUTOREV[doc] = "When SRCREV is set to the value of this variable, it specifies to use the latest source revision in the repository."

#B

B[doc] = "The Build Directory. The OpenEmbedded build system places generated objects into the Build Directory during a recipe's build process."
BAD_RECOMMENDATIONS[doc] = "A list of packages not to install despite being recommended by a recipe. Support for this variable exists only when using the IPK or RPM packaging backends."
BB_DANGLINGAPPENDS_WARNONLY[doc] = "Defines how BitBake handles situations where an append file (.bbappend) has no corresponding recipe file (.bb)."
BB_DISKMON_DIRS[doc] = "Monitors disk space and available inodes during the build and allows you to control the build based on these parameters."
BB_DISKMON_WARNINTERVAL[doc] = "Defines the disk space and free inode warning intervals. To set these intervals, define the variable in the conf/local.conf file in the Build Directory."
BB_GENERATE_MIRROR_TARBALLS[doc] = "Causes tarballs of the Git repositories to be placed in the DL_DIR directory."
BB_NUMBER_THREADS[doc] = "The maximum number of tasks BitBake should run in parallel at any one time. A good rule of thumb is to set this variable to twice the number of cores."
BBCLASSEXTEND[doc] = "Allows you to extend a recipe so that it builds variants of the software. Common variants for recipes are 'native', 'cross', 'nativesdk' and multilibs."
BBFILE_COLLECTIONS[doc] = "Lists the names of configured layers. These names are used to find the other BBFILE_* variables."
BBFILE_PATTERN[doc] = "Variable that expands to match files from BBFILES in a particular layer. This variable is used in the layer.conf file and must be suffixed with the name of a layer."
BBFILE_PRIORITY[doc] = "Assigns the priority for recipe files in each layer. Setting this variable allows you to prioritize a layer against other layers that contain the same recipe."
BBFILES[doc] = "List of recipe files used by BitBake to build software."
BBINCLUDELOGS[doc] = "Variable that controls how BitBake displays logs on build failure."
BBINCLUDELOGS_LINES[doc] = "Amount of log lines printed on failure."
BBLAYERS[doc] = "Lists the layers to enable during the build. This variable is defined in the bblayers.conf configuration file."
BBMASK[doc] = "Prevents BitBake from processing specific recipes or recipe append files."
BBPATH[doc] = "Used by BitBake to locate .bbclass and configuration files. This variable is analogous to the PATH variable."
BBSERVER[doc] = "Points to the server that runs memory-resident BitBake."
BINCONFIG_GLOB[doc] = "When inheriting binconfig.bbclass from a recipe, this variable specifies a wildcard for configuration scripts that need editing."
BP[doc] = "The base recipe name and version but without any special recipe name suffix (i.e. -native, lib64-, and so forth). BP is comprised of ${BPN}-${PV}"
BPN[doc] = "The bare name of the recipe. This variable is a version of the PN variable but removes common suffixes and prefixes."
BUGTRACKER[doc] = "Specifies a URL for an upstream bug tracking website for a recipe."
BUILD_ARCH[doc] = "The name of the building architecture (e.g. i686)."
BUILD_OS[doc] = "The operating system (in lower case) of the building architecture (e.g. linux)."
BUILDDIR[doc] = "Points to the location of the Build Directory."
BUILDSTATS_BASE[doc] = "Points to the location of the directory that holds build statistics when you use and enable the buildstats class."
BUSYBOX_SPLIT_SUID[doc] = "For the BusyBox recipe, specifies whether to split the output executable file into two parts: one for features that require setuid root, and one for the remaining features."

#C

CACHE[doc]  = "The directory holding the cache of the metadata."
CFLAGS[doc] = "Flags passed to the C compiler for the target system. This variable evaluates to the same as TARGET_CFLAGS."
CLASSOVERRIDE[doc] = "An internal variable specifying the special class override that should currently apply (e.g. "class-target", "class-native", and so forth)."
CLEANBROKEN[doc] = "Specifies if 'make clean' does not work for a recipe (and therefore the build system should not try to use it during do_configure)"
COMBINED_FEATURES[doc] = "A set of features common between MACHINE_FEATURES and DISTRO_FEATURES."
COMMON_LICENSE_DIR[doc] = "Points to meta/files/common-licenses in the Source Directory, which is where generic license files reside."
COMPATIBLE_HOST[doc] = "A regular expression that resolves to one or more hosts (when the recipe is native) or one or more targets (when the recipe is non-native) with which a recipe is compatible."
COMPATIBLE_MACHINE[doc] = "A regular expression that resolves to one or more target machines with which a recipe is compatible."
COMPLEMENTARY_GLOB[doc] = "Defines wildcards to match when installing a list of complementary packages for all the packages installed in an image."
CONFFILES[doc] = "Identifies editable or configurable files that are part of a package."
CONFIG_SITE[doc] = "A list of files that contains autoconf test results relevant to the current build. This variable is used by the Autotools utilities when running configure."
CONFLICT_DISTRO_FEATURES[doc] = "When a recipe inherits the distro_features_check class, this variable identifies distribution features that would be in conflict should the recipe be built."
CORE_IMAGE_EXTRA_INSTALL[doc] = "Specifies the list of packages to be added to the image. You should only set this variable in the conf/local.conf file in the Build Directory."
COREBASE[doc] = "Specifies the parent directory of the OpenEmbedded Core Metadata layer (i.e. meta)."
CONF_VERSION[doc] = "Tracks the version of local.conf.  Increased each time build/conf/ changes incompatibly."
CVSDIR[doc] = "The directory where cvs checkouts will be stored in."

#D

D[doc] = "The destination directory."
DATE[doc] = "The date the build was started using YMD format."
DATETIME[doc] = "The date and time the build was started."
DEBUG_BUILD[doc] = "Specifies to build packages with debugging information. This influences the value of the SELECTED_OPTIMIZATION variable."
DEBUG_OPTIMIZATION[doc] = "The options to pass in TARGET_CFLAGS and CFLAGS when compiling a system for debugging. This variable defaults to '-O -fno-omit-frame-pointer ${DEBUG_FLAGS} -pipe'."
DEFAULT_PREFERENCE[doc] = "Specifies a weak bias for recipe selection priority."
DEPENDS[doc] = "Lists a recipe's build-time dependencies (i.e. other recipe files)."
DEPLOY_DIR[doc] = "Points to the general area that the OpenEmbedded build system uses to place images, packages, SDKs and other output files that are ready to be used outside of the build system."
DEPLOY_DIR_IMAGE[doc] = "Points to the area that the OpenEmbedded build system uses to place images and other associated output files that are ready to be deployed onto the target machine."
DEPLOYDIR[doc] = "For recipes that inherit the deploy class, the DEPLOYDIR points to a temporary work area for deployed files."
DESCRIPTION[doc] = "The package description used by package managers. If not set, DESCRIPTION takes the value of the SUMMARY variable."
DISTRO[doc] = "The short name of the distribution. If the variable is blank, meta/conf/distro/defaultsetup.conf will be used."
DISTRO_EXTRA_RDEPENDS[doc] = "Specifies a list of distro-specific packages to add to all images. The variable only applies to the images that include packagegroup-base."
DISTRO_EXTRA_RRECOMMENDS[doc] = "Specifies a list of distro-specific packages to add to all images if the packages exist. The list of packages are automatically installed but you can remove them."
DISTRO_FEATURES[doc] = "The features enabled for the distribution."
DISTRO_FEATURES_BACKFILL[doc] = "Features to be added to DISTRO_FEATURES if not also present in DISTRO_FEATURES_BACKFILL_CONSIDERED. This variable is set in the meta/conf/bitbake.conf file and it is not intended to be user-configurable."
DISTRO_FEATURES_BACKFILL_CONSIDERED[doc] = "Features from DISTRO_FEATURES_BACKFILL that should not be backfilled (i.e. added to DISTRO_FEATURES) during the build."
DISTRO_NAME[doc] = "The long name of the distribution."
DISTRO_PN_ALIAS[doc] = "Alias names used for the recipe in various Linux distributions."
DISTRO_VERSION[doc] = "The version of the distribution."
DISTROOVERRIDES[doc] = "Lists overrides specific to the current distribution. By default, the variable list includes the value of the DISTRO variable."
DL_DIR[doc] = "The central download directory used by the build process to store downloads. By default, the directory is 'downloads' in the Build Directory."

#E

ENABLE_BINARY_LOCALE_GENERATION[doc] = "Controls which locales for glibc are generated during the build. The variable is useful if the target device has 64Mbytes of RAM or less."
ERROR_QA[doc] = "Specifies the quality assurance checks whose failures are reported as errors by the OpenEmbedded build system."
EXCLUDE_FROM_WORLD[doc] = "Directs BitBake to exclude a recipe from world builds (i.e. bitbake world)."
EXTENDPE[doc] = "Used with file and pathnames to create a prefix for a recipe's version based on the recipe's PE value. If PE is set and greater than zero for a recipe, EXTENDPE becomes that value."
EXTENDPKGV[doc] = "The full package version specification as it appears on the final packages produced by a recipe."
EXTERNALSRC[doc] = "If externalsrc.bbclass is inherited, this variable points to the source tree, which is outside of the OpenEmbedded build system."
EXTERNALSRC_BUILD[doc] = "If externalsrc.bbclass is inherited, this variable points to the directory in which the recipe's source code is built, which is outside of the OpenEmbedded build system."
EXTRA_IMAGE_FEATURES[doc] = "The list of additional features to include in an image. Configure this variable in the conf/local.conf file in the Build Directory."
EXTRA_IMAGEDEPENDS[doc] = "A list of recipes to build that do not provide packages for installing into the root filesystem. Use this variable to list recipes that are required to build the final image, but not needed in the root filesystem."
EXTRA_OECMAKE[doc] = "Additional cmake options."
EXTRA_OECONF[doc] = "Additional configure script options."
EXTRA_OEMAKE[doc] = "Additional GNU make options."
EXTRA_OESCONS[doc] = "When a recipe inherits the scons class, this variable specifies additional configuration options you want to pass to the scons command line."
EXTRA_QMAKEVARS_POST[doc] = "Configuration variables or options you want to pass to qmake when the arguments need to be after the .pro file list on the command line."
EXTRA_QMAKEVARS_PRE[doc] = "Configuration variables or options you want to pass to qmake when the arguments need to be before the .pro file list on the command line."
EXTRA_USERS_PARAMS[doc] = "When a recipe inherits the extrausers class, this variable provides image level user and group operations."

#F

FEED_DEPLOYDIR_BASE_URI[doc] = "Allow to serve ipk deploy directory as an ad hoc feed (bogofeed). Set to base URL of the directory as exported by HTTP. Set of ad hoc feed configs will be generated in the image."
FILES[doc] = "The list of directories or files that are placed in packages."
FILESEXTRAPATHS[doc] = "Extends the search path the OpenEmbedded build system uses when looking for files and patches as it processes recipes and append files."
FILESOVERRIDES[doc] = "A subset of OVERRIDES used by the OpenEmbedded build system for creating FILESPATH."
FILESPATH[doc] = "The default set of directories the OpenEmbedded build system uses when searching for patches and files. It is defined in the base.bbclass class found in meta/classes in the Source Directory. Do not hand-edit the FILESPATH variable."
FILESYSTEM_PERMS_TABLES[doc] = "Allows you to define your own file permissions settings table as part of your configuration for the packaging process."
FONT_EXTRA_RDEPENDS[doc] = "When a recipe inherits the fontcache class, this variable specifies runtime dependencies for font packages. This variable defaults to 'fontconfig-utils'."
FONT_PACKAGES[doc] = "When a recipe inherits the fontcache class, this variable identifies packages containing font files that need to be cached by Fontconfig."
FULL_OPTIMIZATION[doc]= "The options to pass in TARGET_CFLAGS and CFLAGS when compiling an optimized system. This variable defaults to '-O2 -pipe ${DEBUG_FLAGS}'."

#G

GITDIR[doc] = "The directory where Git clones will be stored."
GROUPADD_PARAM[doc] = "When a recipe inherits the useradd class, this variable specifies for a package what parameters should be passed to the groupadd command if you wish to add a group to the system when the package is installed."
GROUPMEMS_PARAM[doc] = "When a recipe inherits the useradd class, this variable specifies for a package what parameters should be passed to the groupmems command if you wish to modify the members of a group when the package is installed."
GRUB_GFXSERIAL[doc] = "Configures the GNU GRand Unified Bootloader (GRUB) to have graphics and serial in the boot menu."
GRUB_OPTS[doc] = "Additional options to add to the GNU GRand Unified Bootloader (GRUB) configuration."
GRUB_TIMEOUT[doc] = "Specifies the timeout before executing the default LABEL in the GNU GRand Unified Bootloader (GRUB)."
GTKIMMODULES_PACKAGES[doc] = "For recipes that inherit the gtk-immodules-cache class, this variable specifies the packages that contain the GTK+ input method modules being installed when the modules are in packages other than the main package."

#H

HOMEPAGE[doc] = "Website where more information about the software the recipe is building can be found."
HOST_ARCH[doc] = "The name of the target architecture. Normally same as the TARGET_ARCH."
HOST_CC_ARCH[doc] = "The name of the host architecture. Normally same as the TARGET_CC_ARCH."
HOST_OS[doc] = "The name of the target operating system. Normally the same as the TARGET_OS."
HOST_PREFIX[doc] = "The prefix for the cross compile toolchain. Normally same as the TARGET_PREFIX."
HOST_SYS[doc] = "Specifies the system, including the architecture and the operating system, for with the build is occurring in the context of the current recipe."
HOST_VENDOR[doc] = "The name of the vendor. Normally same as the TARGET_VENDOR."

#I

ICECC_ENV_EXEC[doc] = "Points to the icecc-create-env script that you provide."
ICECC_PATH[doc] = "The location of the icecc binary."
ICECC_USER_CLASS_BL[doc] = "Identifies user classes that you do not want the Icecream distributed compile support to consider."
ICECC_USER_PACKAGE_BL[doc] = "Identifies user recipes that you do not want the Icecream distributed compile support to consider."
ICECC_USER_PACKAGE_WL[doc] = "Identifies user recipes that use an empty PARALLEL_MAKE variable that you want to force remote distributed compilation on using the Icecream distributed compile support."
IMAGE_BASENAME[doc] = "The base name of image output files."
IMAGE_BOOT_FILES[doc] = "Whitespace separated list of files from ${DEPLOY_DIR_IMAGE} to place in boot partition. Entries will be installed under a same name as the source file. To change the destination file name, pass a desired name after a semicolon (eg. u-boot.img;uboot)."
IMAGE_CLASSES[doc] = "A list of classes that all images should inherit."
IMAGE_FEATURES[doc] = "The primary list of features to include in an image. Configure this variable in an image recipe."
IMAGE_FSTYPES[doc] = "Formats of root filesystem images that you want to have created."
IMAGE_FSTYPES_DEBUGFS[doc] = "Formats of the debug root filesystem images that you want to have created."
IMAGE_GEN_DEBUGFS[doc] = "When set to '1', generate a companion debug object/source filesystem image."
IMAGE_INSTALL[doc] = "Specifies the packages to install into an image. Image recipes set IMAGE_INSTALL to specify the packages to install into an image through image.bbclass."
IMAGE_LINGUAS[doc] = "Specifies the list of locales to install into the image during the root filesystem construction process."
IMAGE_NAME[doc] = "The name of the output image files minus the extension."
IMAGE_OVERHEAD_FACTOR[doc] = "Defines a multiplier that the build system applies to the initial image size for cases when the multiplier times the returned disk usage value for the image is greater than the sum of IMAGE_ROOTFS_SIZE and IMAGE_ROOTFS_EXTRA_SPACE."
IMAGE_PKGTYPE[doc] = "Defines the package type (DEB, RPM, IPK, or TAR) used by the OpenEmbedded build system."
IMAGE_POSTPROCESS_COMMAND[doc] = "Added by classes to run post processing commands once the OpenEmbedded build system has created the image."
IMAGE_ROOTFS[doc] = "The location of the root filesystem while it is under construction (i.e. during do_rootfs)."
IMAGE_ROOTFS_EXTRA_SPACE[doc] = "Defines additional free disk space created in the image in Kbytes. By default, this variable is set to '0'."
IMAGE_ROOTFS_SIZE[doc] = "Defines the size in Kbytes for the generated image."
IMAGE_TYPES[doc] = "Specifies the complete list of supported image types by default."
INC_PR[doc] = "Helps define the recipe revision for recipes that share a common include file."
INCOMPATIBLE_LICENSE[doc] = "Specifies a space-separated list of license names (as they would appear in LICENSE) that should be excluded from the build. Wildcard is supported, such as '*GPLv3'"
INHIBIT_DEFAULT_DEPS[doc] = "Prevents the default dependencies, namely the C compiler and standard C library (libc), from being added to DEPENDS."
INHIBIT_PACKAGE_STRIP[doc] = "If set to "1", causes the build to not strip binaries in resulting packages."
INHERIT[doc] = "Causes the named class to be inherited at this point during parsing. The variable is only valid in configuration files."
INHERIT_DISTRO[doc] = "Lists classes that will be inherited at the distribution level. It is unlikely that you want to edit this variable."
INITRAMFS_FSTYPES[doc] = "Defines the format for the output image of an initial RAM disk (initramfs), which is used during boot."
INITRD[doc] = "Indicates a list of filesystem images to concatenate and use as an initial RAM disk (initrd)."
INITSCRIPT_NAME[doc] = "The filename of the initialization script as installed to ${sysconfdir}/init.d."
INITSCRIPT_PACKAGES[doc] = "A list of the packages that contain initscripts. This variable is used in recipes when using update-rc.d.bbclass. The variable is optional and defaults to the PN variable."
INITSCRIPT_PARAMS[doc] = "Specifies the options to pass to update-rc.d. The variable is mandatory and is used in recipes when using update-rc.d.bbclass."
INSANE_SKIP[doc] = "Specifies the QA checks to skip for a specific package within a recipe."
IPK_FEED_URIS[doc] = "List of ipkg feed records to put into generated image."

#K

KARCH[doc] = "Defines the kernel architecture used when assembling the configuration. You define the KARCH variable in the BSP Descriptions."
KBRANCH[doc] = "A regular expression used by the build process to explicitly identify the kernel branch that is validated, patched and configured during a build."
KBRANCH_DEFAULT[doc] = "Defines the Linux kernel source repository's default branch used to build the Linux kernel. Unless you specify otherwise, the variable initializes to 'master'."
KERNEL_CLASSES[doc] = "A list of classes defining kernel image types that kernel class should inherit."
KERNEL_EXTRA_ARGS[doc] = "Specifies additional make command-line arguments the OpenEmbedded build system passes on when compiling the kernel."
KERNEL_FEATURES[doc] = "Includes additional metadata from the Yocto Project kernel Git repository. The metadata you add through this variable includes config fragments and features descriptions."
KERNEL_IMAGETYPE[doc] = "The type of kernel to build for a device, usually set by the machine configuration files and defaults to 'zImage'."
KERNEL_IMAGETYPES[doc] = "The list of types of kernel to build for a device, usually set by the machine configuration files and defaults to KERNEL_IMAGETYPE."
KERNEL_MODULE_AUTOLOAD[doc] = "Lists kernel modules that need to be auto-loaded during boot"
KERNEL_MODULE_PROBECONF[doc] = "Lists kernel modules for which the build system expects to find module_conf_* values that specify configuration for each of the modules"
KERNEL_PATH[doc] = "The location of the kernel sources. This variable is set to the value of the STAGING_KERNEL_DIR within the module class (module.bbclass)."
KERNEL_SRC[doc] = "The location of the kernel sources. This variable is set to the value of the STAGING_KERNEL_DIR within the module class (module.bbclass)."
KFEATURE_DESCRIPTION[doc] = "Provides a short description of a configuration fragment. You use this variable in the .scc file that describes a configuration fragment file."
KMACHINE[doc] = "The machine as known by the kernel."
KTYPE[doc] = "Defines the kernel type to be used in assembling the configuration."

#L

LAYERDEPENDS[doc] = "Lists the layers, separated by spaces, upon which this recipe depends. This variable is used in the conf/layer.conf file and must be suffixed with the name of the specific layer."
LAYERDIR[doc] = "When used inside the layer.conf configuration file, this variable provides the path of the current layer."
LAYERVERSION[doc] = "Optionally specifies the version of a layer as a single number. This variable is used in the conf/layer.conf file and must be suffixed with the name of the specific layer."
LEAD_SONAME[doc] = "Specifies the lead (or primary) compiled library file (.so) that the debian class applies its naming policy to given a recipe that packages multiple libraries."
LIC_FILES_CHKSUM[doc] = "Checksums of the license text in the recipe source code."
LICENSE[doc] = "The list of source licenses for the recipe. Logical operators '&' or '|' and parentheses can be used."
LICENSE_PATH[doc] = "Path to additional licenses used during the build."
LINUX_KERNEL_TYPE[doc] = "Defines the kernel type to be used in assembling the configuration."
LINUX_VERSION[doc] = "The Linux version from kernel.org on which the Linux kernel image being built using the OpenEmbedded build system is based. You define this variable in the kernel recipe."
LINUX_VERSION_EXTENSION[doc] = "A string extension compiled into the version string of the Linux kernel built with the OpenEmbedded build system. You define this variable in the kernel recipe."
LOCALE_UTF8_IS_DEFAULT[doc] = "If set, locale names are renamed such that those lacking an explicit encoding (e.g. en_US) will always be UTF-8, and non-UTF-8 encodings are renamed to, e.g., en_US.ISO-8859-1. Otherwise, the encoding is specified by glibc's SUPPORTED file. Not supported for precompiled locales."
LOG_DIR[doc] = "Specifies the directory to which the OpenEmbedded build system writes overall log files. The default directory is ${TMPDIR}/log"

#M

MACHINE[doc] = "Specifies the target device for which the image is built. You define MACHINE in the conf/local.conf file in the Build Directory."
MACHINE_ESSENTIAL_EXTRA_RDEPENDS[doc] = "A list of required machine-specific packages to install as part of the image being built. Because this is a 'machine essential' variable, the list of packages are essential for the machine to boot."
MACHINE_ESSENTIAL_EXTRA_RRECOMMENDS[doc] = "A list of recommended machine-specific packages to install as part of the image being built. Because this is a 'machine essential' variable, the list of packages are essential for the machine to boot."
MACHINE_EXTRA_RDEPENDS[doc] = "A list of machine-specific packages to install as part of the image being built that are not essential for the machine to boot. However, the build process for more fully-featured images depends on the packages being present."
MACHINE_EXTRA_RRECOMMENDS[doc] = "A list of machine-s