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authorHaris Okanovic <haris.okanovic@ni.com>2017-11-07 12:40:39 -0600
committerRichard Purdie <richard.purdie@linuxfoundation.org>2018-01-02 17:24:12 +0000
commit6c8c899849d101fd1b86aad0b8eed05c7c785924 (patch)
treedba0d3ce7a21b196c165f98c1731f112d0cf2d2b /meta/conf
parent923f91d8d8606141ce218927bc943f4f4f34bcdd (diff)
downloadopenembedded-core-6c8c899849d101fd1b86aad0b8eed05c7c785924.tar.gz
kernel: Add support for multiple kernel packages
Some distros may want to provide alternate kernel "flavors" via feeds or within bootable images. For example, readily available builds which provide certain diagnostic features can enable developers and testers to more quickly resolve issues by avoiding lengthy kernel builds. This change allows for building multiple flavors of the kernel and module packages by templatizing kernel package names via a new KERNEL_PACKAGE_NAME variable in kernel.bbclass. It defaults to the old name of "kernel", but can be overridden by certain recipes providing alternate kernel flavors. To maintain compatibility, recipes providing alternate kernel flavors cannot be the "preferred provider" for virtual/kernel. This is because OE puts the preferred provider's build and source at "tmp-glibc/work-shared/$MACHINE/kernel-build-artifacts/" and "tmp-glibc/work-shared/$MACHINE/kernel-source/" instead of "tmp-glibc/work/*/$PN/" like other recipes. Therefore, recipes using the default KERNEL_PACKAGE_NAME="kernel" follows the old semantics -- build in the old location and may be preferred provider -- while recipes using all other KERNEL_PACKAGE_NAME's build from the normal WORKDIR and don't provide "virtual/kernel". Testing: 1. Add `KERNEL_PACKAGE_NAME_pn-linux-yocto-tiny = "tiny-linux"` to local.conf so that linux-yocto-tiny may build alongside the main kernel (linux-yocto). 2. `bitbake linux-yocto linux-yocto-tiny` to build both kernel flavors. 3. Verified image and modules IPKs exist for both: tmp-glibc/deploy/ipk/qemux86/kernel-* for linux-yocto tmp-glibc/deploy/ipk/qemux86/tiny-linux* for linux-yocto-tiny 4. Verified linux-yocto is the "preferred provider", and was built in shared directory: tmp-glibc/work-shared/qemux86/kernel-* 5. Add `CORE_IMAGE_BASE_INSTALL_append_pn-core-image-base = "tiny-linux"` to local.conf to install both kernel flavors in core-image-base. 6. `bitbake core-image-base` to build an image. 7. Verified image contains two bzImage's under /boot/, with "yocto-standard" (linux-yocto recipe) selected to boot via symlink. Discussion threads: http://lists.openembedded.org/pipermail/openembedded-core/2015-December/thread.html#114122 http://lists.openembedded.org/pipermail/openembedded-core/2017-July/thread.html#139130 [YOCTO #11363] Signed-off-by: Ioan-Adrian Ratiu <adrian.ratiu@ni.com> Signed-off-by: Gratian Crisan <gratian.crisan@ni.com> Signed-off-by: Haris Okanovic <haris.okanovic@ni.com> Coauthored-by: Gratian Crisan <gratian.crisan@ni.com> Coauthored-by: Haris Okanovic <haris.okanovic@ni.com> Coauthored-by: Josh Hernstrom <josh.hernstrom@ni.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
Diffstat (limited to 'meta/conf')
-rw-r--r--meta/conf/documentation.conf1
1 files changed, 1 insertions, 0 deletions
diff --git a/meta/conf/documentation.conf b/meta/conf/documentation.conf
index 081e726d4b..995b60e158 100644
--- a/meta/conf/documentation.conf
+++ b/meta/conf/documentation.conf
@@ -247,6 +247,7 @@ KERNEL_IMAGETYPE[doc] = "The type of kernel to build for a device, usually set b
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_PACKAGE_NAME[doc] = "Name prefix for kernel packages. Defaults to 'kernel'."
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."