bedb3444e1
There may be a case where we want to build an initramfs image that doesnt inherit the same DISTRO_FEATURES (or others) from the main image being built. For example we may want our initramfs not to inherit a certain conf or feature, say we want to use musl for a smaller footprint, but if we are using TCLIBC=glibc for our DISTRO (and inherently our main image), the initramfs image would inherit that conf and be forced to use glibc, growing in size as a side effect, currently avoiding this is not supported. Allow the kernel class to create a multiconfig dependency (mcdepends) vs depends for do_bundle_initramfs and define our INITRAMFS_IMAGE from a separate multiconfig via two new variables: INITRAMFS_MULTICONFIG and INITRAMFS_DEPLOY_DIR_IMAGE which define the multiconfig where the initramfs image should be coming from and its deploy directory respectively, these two keep a default definition which preserves current behavior (do_bundle_initramfs uses depends). Example usage: - Create and use multiconfig initramfscfg.conf and set TCLIBC=musl there, along with its TMPDIR. - Add the following to our DISTRO.conf: INITRAMFS_MULTICONFIG = "initramfscfg" and set INITRAMFS_DEPLOY_DIR_IMAGE to the DEPLOY_DIR_IMAGE of the initramfscfg multiconfig (hence our main kernel will be able to grab it from there and bundle it). This will result in our musl based initramfs bundled in our main kernel and our main image to be glibc based. (From OE-Core rev: 2d317b2685211f1b0d102705a63c0000df96f45f) Signed-off-by: Alejandro Enedino Hernandez Samaniego <alhe@linux.microsoft.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Poky
Poky is an integration of various components to form a pre-packaged build system and development environment which is used as a development and validation tool by the Yocto Project. It features support for building customised embedded style device images and custom containers. There are reference demo images ranging from X11/GTK+ to Weston, commandline and more. The system supports cross-architecture application development using QEMU emulation and a standalone toolchain and SDK suitable for IDE integration.
Additional information on the specifics of hardware that Poky supports is available in README.hardware. Further hardware support can easily be added in the form of BSP layers which extend the systems capabilities in a modular way. Many layers are available and can be found through the layer index.
As an integration layer Poky consists of several upstream projects such as BitBake, OpenEmbedded-Core, Yocto documentation, the 'meta-yocto' layer which has configuration and hardware support components. These components are all part of the Yocto Project and OpenEmbedded ecosystems.
The Yocto Project has extensive documentation about the system including a reference manual which can be found at https://docs.yoctoproject.org/
OpenEmbedded is the build architecture used by Poky and the Yocto project. For information about OpenEmbedded, see the OpenEmbedded website.
Contribution Guidelines
The project works using a mailing list patch submission process. Patches should be sent to the mailing list for the repository the components originate from (see below). Throughout the Yocto Project, the README files in the component in question should detail where to send patches, who the maintainers are and where bugs should be reported.
A guide to submitting patches to OpenEmbedded is available at:
https://www.openembedded.org/wiki/How_to_submit_a_patch_to_OpenEmbedded
There is good documentation on how to write/format patches at:
https://www.openembedded.org/wiki/Commit_Patch_Message_Guidelines
Where to Send Patches
As Poky is an integration repository (built using a tool called combo-layer), patches against the various components should be sent to their respective upstreams:
OpenEmbedded-Core (files in meta/, meta-selftest/, meta-skeleton/, scripts/):
- Git repository: https://git.openembedded.org/openembedded-core/
- Mailing list: openembedded-core@lists.openembedded.org
BitBake (files in bitbake/):
- Git repository: https://git.openembedded.org/bitbake/
- Mailing list: bitbake-devel@lists.openembedded.org
Documentation (files in documentation/):
- Git repository: https://git.yoctoproject.org/cgit/cgit.cgi/yocto-docs/
- Mailing list: docs@lists.yoctoproject.org
meta-yocto (files in meta-poky/, meta-yocto-bsp/):
- Git repository: https://git.yoctoproject.org/cgit/cgit.cgi/meta-yocto
- Mailing list: poky@lists.yoctoproject.org
If in doubt, check the openembedded-core git repository for the content you intend to modify as most files are from there unless clearly one of the above categories. Before sending, be sure the patches apply cleanly to the current git repository branch in question.