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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
The Yocto build system
- Build system objectives
- Building deployable images
- Layers and layer priorities
- Directory layout
- Configuration files (local, machine and distribution)
- The bitbake tool
- Using Yocto
- Building a package
- Building an image (root file system + u-boot + kernel)
- Miscellaneous tools around Yocto
| Exercise: |
Building a root file system using Yocto |
| Exercise: |
Use bitbake commands to build package & images |
| Exercise: |
Building a root file system using Yocto |
| Exercise: |
Build an extensible SDK for the generated image |
| Exercise: |
Deploy the generated image |
Yocto package 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
- Adding a new layer
- Layer structure
- Various kinds of layers
| Exercise: |
Adding a new layer |
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
- Debugging recipes
- Debugging recipe selection
- Debugging dependencies
- Debugging tasks
- Defining packaging
- Automatically starting a program
| Exercise: |
Writing a recipe for a local user-maintained package |
| Exercise: |
Writing and debugging a package recipe for an autotools-based package |
| Exercise: |
Starting a program at boot (systemd) |
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
- Defining new tasks
- Task declaration
- Coding tasks
| Exercise: |
Adding patches and dependencies to a community package |
| Exercise: |
Adding a rootfsinstall task to directly copy the output of a user package in the rootfs image |
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 |
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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, …)
- Users and groups management
- Package management
| Exercise: |
Writing and building an image recipe |
| Exercise: |
Add new users to the image |
| Exercise: |
Create an image with package support for OTA deployment |
| Exercise: |
Test OTA update on the generated image |
Fourth Day
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 |
Develop and debug applications using SDK and eclipse
- Adding eclipse remote debug packages
- Configuring eclipse
| Exercise: |
Create remote debugging session using eclipse |
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 |
Porting Yocto
- Porting Yocto to a new board
- BSP architecture
- Selecting and configuring u-boot recipe
- Selecting and configuring kernel recipe
- Adding a new BSP layer (yocto-bsp create)
| Exercise: |
Creating a new BSP layer |
Fifth Day
BSP Development
- Adding a custom u-boot to Yocto
- Customizing the Yocto kernel recipe
- Setting the default configuration
- Adding patches
- Specifying the kernel sources
- Configuring Linux Kernel
- Using menuconfig
- Using patches
- Creating Configuration Fragments
- Validating Configuration
- Kernel device tree
| Exercise: |
Create u-boot and kernel recipes to use custom versions, test the result |
| Exercise: |
Patch kernel and activate new options using a fragment |
| Exercise: |
Create and use a new device tree |
Out-of-Tree Modules
- Adding modules to image
- Creating an out-of-tree module
- Kernel modules with eSDK
| Exercise: |
Build and test modules |
Tailoring the build system
- Setting up a Yocto source cache
- Local, per system, cache setup
- Setting up a global, network wide, cache
- Customizing the build system
- Using a prebuilt toolchain
- Using a pre-compiled kernel
- Optimizing Yocto build times
- Using prebuilt, binary, packages
- Using shared compilation caches
| Exercise: |
Setting up a global source cache |
| Exercise: |
Setting up an optimized build environment and rebuilding an image |
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