9b3fcb0d91
There's been a recent discussion about how we can make the Yocto SDK experience better [1]. One of the ideas was to eliminate the SDK as a separate artefact altogether and simply provide everything that the SDK and eSDKs do directly in a yocto build. This does not mean that people have to 'learn Yocto', but rather that the integrators should provide a well-functioning sstate cache infrastructure (same as with minimal eSDK, really), and a few wrapper scripts for setting up the build and the SDK environment that run layer setup and bitbake behind the scenes. [1] https://lists.openembedded.org/g/openembedded-architecture/topic/thoughts_on_the_esdk/90990557 So without further ado, here's how you get a 'SDK' without building one: 1. Set up all the needed layers and a yocto build directory. 2. Run: $ bitbake meta-ide-support $ bitbake -c populate_sysroot gtk+3 (or any other target or native item that the application developer would need) $ bitbake populate-sysroots 3. Set up the SDK environment: . tmp/deploy/images/qemux86-64/environment-setup-core2-64-poky-linux (adjust accordingly) Et voila! The Unix environment is now set up to use the cross-toolchain from Yocto, exactly as in the SDK. And devtool/bitbake are available to extend it, exactly as in the eSDK. Theare are numerous benefits here: no need to produce, test, distribute and maintain separate SDK artifacts. No two separate environments for the yocto build and the SDK. Less code paths where things can go wrong. Less awkward, gigantic tarballs. Less SDK update headaches: 'updating the SDK' simply means updating the yocto layers with git fetch or layer management tooling. Built-in SDK extensibility: just run bitbake again to add more things to the sysroot, or add layers if even more things are required. How is this tested? Exactly same as the regular SDK: $ bitbake -c testsdk meta-ide-support This runs the same toolchain tests from meta/lib/oeqa/sdk/cases as the regular sdk testing does. (From OE-Core rev: 5c845d7f4ea6ae7ba18ed43180dad28775cace31) Signed-off-by: Alexander Kanavin <alex@linutronix.de> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.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.