First Day
Introduction to Yocto
- Overview of Yocto
- History
- Yocto, Open Embedded and Poky
- Purpose of the Yocto project
- The main projects
- Yocto architecture
- Overview
- Recipes and classes
- Tasks
| Exercise: |
Setting up the labs environment |
The Yocto build system
- Build system objectives
- Building deployable images
| Exercise: |
Building a root file system using Yocto |
- Build system architecture
- Layers and layer priorities
- Directory layout
- Configuration files
- The bitbake tool
- Common options
- Using Yocto
- The bitbake tool
- Common options
- Base commands
- Building a package
- Building an image (root file system + u-boot + kernel)
| Exercise: |
Use bitbake commands to build packages and images |
- Miscellaneous tools around Yocto
- Yocto Application Development Toolkit (ADT)
- Toaster
| Exercise: |
Deploy the generated image |
Yocto recipes structure
- Recipe architecture
- Tasks
- Task dependencies
- Recipe dependencies
- The bitbake language
- Standard variables and functions
- Classes and recipes
- The base Yocto classes
- Main bitbake commands
| Exercise: |
Examine and understand real-life configuration files |
Second Day
Writing package recipes for Yocto
- Various kind of recipes and classes
- bare program
- Makefile-based package
- autotools-based package
- u-boot
- kernel
- out-of-tree module
- Recipe creation strategies
- From scratch
- Using devtool
- Using recipetool
- From an existing, similar, recipe
| Exercise: |
Writing a recipe for a local user-maintained package |
| Exercise: |
Writing a recipe for a local out-of-tree module |
- Debugging recipes
- Debugging recipe selection
- Debugging dependencies
- debugging tasks
| Exercise: |
Writing and debugging a recipe for an autotools, git-maintained, package |
| Exercise: |
Writing and debugging a recipe for an autotools library package |
- Automatically starting a program (class update-rc.d)
| Exercise: |
Starting an ssh daemon on the target |
Modifying recipes
- Customizing an existing package recipe (.bbappend)
- Recipe dependencies
- Creating and adding patches
- Creating a patch for a community-provided component
- Creating a patch for an user-maintained component
| Exercise: |
Adding patches and dependencies to a community package |
- Defining new tasks
- Task declaration
- Coding tasks
| Exercise: |
Adding a rootfsinstall task to directly copy the output of an user package in the rootfs image |
Development process using the extensible SDK and devtool
- Using devtool to create a package and its recipe
- Using devtool to modify an existing package and recipe
- Using devtool to update a recipe to build a new version of a package
| Exercise: |
Create, test and modify a recipe for an existing package using devtool |
Third Day
Creating new kinds of recipes
- Creating classes
- Creating new, independent, classes
- Inheriting from an existing class
| Exercise: |
Create a class to generalize the “rootfsinstall” task |
| Exercise: |
Create a class to build firmware packages (for example using an MCU toolchain) |
Creating a root file system
- Building a root file system with Yocto
- Creating a custom root file system
- Writing an image recipe
- Selecting the packages to build
- Selecting the file system types
- The various kinds of images
- Inheriting and customizing images
- Customizing system configuration files (network, mount points, …)
| Exercise: |
Writing and building an image recipe |
| Exercise: |
Creating a JFFS2, UBIFS or EXT2 image with Yocto |
| Exercise: |
Create an image with package support for OTA deployment |
| Exercise: |
Test OTA update on the generated image |
Writing tasks in Python
- Introduction to python
- Using python in Yocto
- The main bitbake classes
- Defining variable values in Python
- Writing tasks in Python
| Exercise: |
Writing a task and customizing a recipe in Python |
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