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Yocto meta layer for RAUC, the embedded Linux update framework
License: MIT License
This project forked from rauc/meta-rauc
Yocto meta layer for RAUC, the embedded Linux update framework
License: MIT License
The meta-rauc layer provides support for integrating the RAUC update tool into your device. Please see the corresponding sections below for details. Dependencies ============ This layer depends on: URI: git://git.openembedded.org/bitbake branch: master URI: git://git.openembedded.org/openembedded-core layers: meta branch: master URI: git://git.yoctoproject.org/meta-oe layers: meta-oe branch: master Patches ======= Please submit patches via GitHub pull request on https://github.com/rauc/meta-rauc Maintainer: Enrico Joerns <[email protected]> Table of Contents ================= I. Adding the rauc layer to your build II. Building RAUC III. Adding the RAUC update framework to your device IV. Configure Custom Kernel V. References I. Adding the rauc Layer to Your Build ====================================== In order to use this layer, you need to make the build system aware of it. Assuming the rauc layer exists at the top-level of your yocto build tree, you can add it to the build system by adding the location of the rauc layer to bblayers.conf, along with any other layers needed. e.g.: BBLAYERS ?= " \ /path/to/yocto/meta \ /path/to/yocto/meta-poky \ /path/to/yocto/meta-yocto-bsp \ /path/to/yocto/meta-rauc \ " II. Building RAUC ================= If you only intend to build the RAUC host tool, you may simply run bitbake rauc-native This will place the rauc binary at tmp/deploy/tools/rauc. III. Adding the RAUC Update Framework to Your Device ==================================================== To prepare your device for using RAUC as its update handler, you have to follow at least the following steps: 1. Add the `rauc` package to your systems image recipe: IMAGE_INSTALL_append = " rauc" 2. Add a rauc_%.bbappend in your device-specific (BSP) layer that installs your RAUC system configuration file under /etc/rauc/system.conf. For information on how to write the RAUC update file, please refer to the RAUC user documentation [1]. FILESEXTRAPATHS_prepend := "${THISDIR}/files:" SRC_URI_append := " file://system.conf" 3. Create a bundle recipe for your device by adding a recipe that inherits the `bundle` class and adds all desired configuration. inherit bundle RAUC_BUNDLE_SLOTS = "rootfs" RAUC_SLOT_rootfs = "my-rootfs-recipe" RAUC_KEY_FILE = "path/to/development-1.key.pem" RAUC_CERT_FILE = "path/to/development-1.cert.pem" For information on how to generate and use the key and certificate files, please refer to the RAUC user documentation [1]. For a more detailed explanation on the required and available variables, read the notes in the bundle.bbclass file. 4. Build a bundle and the rootfs for your device bitbake my-bundle-recipe IV. Configure Custom Kernel =========================== In order to use RAUC on your system, the kernel must support SquashFS and loop mounts. For the standard yocto kernel, the meta-rauc layer provides a kernel configuration fragment that enables the config options required for this. If you build your own kernel with a full custom `defconfig` file, you have to make sure that the options in `recipes-kernel/linux/linux-yocto/rauc.cfg` are enabled in your configuration, too. V. References ============= [1] RAUC user documentation http://rauc.readthedocs.io/en/latest/
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