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The wic plugin creates a disk image containig one ext2/3/4 partition. No additional boot partition is required. Syslinux is installed into the image. The target device is a legacy BIOS PC. Purpose of this plugin: Other avaliable plugins create a fat partition for /boot and an ext partition for rootfs. Current linux-yocto kernel packages are not compatible with this disk layout. The boot partition is not mounted by default, hence the kernel is installed into rootfs and not into boot partition. A kernel update ends up in a bricked device. The old kernel which is still in boot likely does not even boot with updated kernel modules from /. Even if the boot partition is mounted during the kernel update the update will fail. The kernel package installs a symbolic link which is not supported by the fat partition. Creating just one ext partition for boot and rootfs solves all issues related to package based kernel updates on the device. The plugin depends on syslinux-nomtools a user space installer for syslinux on ext filesystems. Thanks to Robert Yang who implemented syslinux-nomtools and supported the implementation of this plugin. (From OE-Core rev: 4a7bd79b5100a496c9b1597b57d6dc18ba2b9c83) Signed-off-by: Adrian Freihofer <adrian.freihofer@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Poky
Poky is an integration of various components to form a complete prepackaged build system and development environment. It features support for building customised embedded device style images. There are reference demo images featuring a X11/Matchbox/GTK themed UI called Sato. The system supports cross-architecture application development using QEMU emulation and a standalone toolchain and SDK with 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 layers which extend the systems capabilities in a modular way.
As an integration layer Poky consists of several upstream projects such as BitBake, OpenEmbedded-Core, Yocto documentation and various sources of information e.g. for the hardware support. Poky is in turn a component of the Yocto Project.
The Yocto Project has extensive documentation about the system including a reference manual which can be found at: http://yoctoproject.org/documentation
OpenEmbedded-Core is a layer containing the core metadata for current versions of OpenEmbedded. It is distro-less (can build a functional image with DISTRO = "nodistro") and contains only emulated machine support.
For information about OpenEmbedded, see the OpenEmbedded website: http://www.openembedded.org/
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:
bitbake: Git repository: http://git.openembedded.org/bitbake/ Mailing list: bitbake-devel@lists.openembedded.org
documentation: Git repository: http://git.yoctoproject.org/cgit/cgit.cgi/yocto-docs/ Mailing list: yocto@yoctoproject.org
meta-yocto(-bsp): Git repository: http://git.yoctoproject.org/cgit/cgit.cgi/meta-yocto(-bsp) Mailing list: poky@yoctoproject.org
Everything else should be sent to the OpenEmbedded Core mailing list. If in doubt, check the oe-core git repository for the content you intend to modify. Before sending, be sure the patches apply cleanly to the current oe-core git repository.
Git repository: http://git.openembedded.org/openembedded-core/
Mailing list: openembedded-core@lists.openembedded.org
Note: The scripts directory should be treated with extra care as it is a mix of oe-core and poky-specific files.