The document is a presentation about professional tools for embedded Linux given at OSCON in 2012. It introduces the Yocto Project, which aims to unify embedded Linux development. It discusses the project's goals of providing consistent tools across architectures. It outlines the project components like the build system, libraries, and governance structure. It then covers the development process involving layers, recipes, and adjustment points. Finally, it provides instructions for getting started, including downloading, configuring, building, and using the Hob interface.

1. Professional Tools for Embedded Linux
Jeff Osier-Mixon, Intel Corporation
Yocto Project Community Manager
OSCON | 7/19/2012
© 2012 The Linux Foundation. All rights reserved.

2. [ yoc-to ]
The smallest unit of measure,
equal to one septillionth (10-24).
Agenda:
 Introduction
 Development Process
 Getting Started
 Q&A

3. Introduction

4. Introducing the Yocto Project
• Overall goals
• Project components
• Governance
• Relationships
Yocto Project presentation @ OSCON 2012
4 © 2012 The Linux Foundation. All rights reserved

5. Introducing the Yocto Project
→ Overall Goals
• Unify the embedded Linux development experience by providing
consistent, interoperable tools, metadata, & processes on all
popular architectures (ARM, Intel, MIPS, PowerPC)
• Respond to the needs of embedded systems developers
• Provide upstream resources for commercial providers
• Encourage community involvement
• Maintain community relationships
• Test thoroughly & provide nightly build structure
• Release on 6-month cadence
Yocto Project presentation @ OSCON 2012
5 © 2012 The Linux Foundation. All rights reserved

6. Introducing the Yocto Project
→ Overview
[video: https://vimeo.com/24743626]
Yocto Project presentation @ OSCON 2012
6 © 2012 The Linux Foundation. All rights reserved

7. Introducing the Yocto Project
→ Project Components
• Build system
– Poky reference system
• BitBake (build tool)
• OpenEmbedded Core (core metadata)
• Core BSPs & layers
• Creates reference distribution
– Development tools
• Application Development Toolkit & Eclipse IDE
• Hob graphical interface
– Related build tools
• Cross-prelink, pseudo, swabber, autobuilder
• Embedded Library: EGLIBC
• Build Appliance
• Reference projects
Yocto Project presentation @ OSCON 2012
7 © 2012 The Linux Foundation. All rights reserved

8. Introducing the Yocto Project
→ Governance
• Open source umbrella project
• Organized under the Linux Foundation
• Split governance model
• Technical Leadership Team
• Advisory Board made up of participating organizations
Yocto Project presentation @ OSCON 2012
8 © 2012 The Linux Foundation. All rights reserved
All logos are trademarks of their respective owners.

9. Introducing the Yocto Project
→ Governance: Roles
Technical Team
Advisory Board
Voting Members Chief Architect
Advocacy Subgroup Maintainers/Leaders
Finance Subgroup Shared Maintainerships
Infrastructure Subgroup Project & Team Management
Systems Administrator Documentation, Build, QA
Contributors
Yocto Project presentation @ OSCON 2012
9 © 2012 The Linux Foundation. All rights reserved

10. Introducing the Yocto Project
→ Governance: Relationships
The Linux Foundation
Parent organization
Upstream Projects
Mutually beneficial
OpenEmbedded Project
It’s complicated
The World
It’s awesome
Yocto Project presentation @ OSCON 2012
10 © 2012 The Linux Foundation. All rights reserved

11. Introducing the Yocto Project
→ Governance: Relationships
upstream
projects
Technical Team
Advisory Board
Voting Members Chief Architect
Advocacy Subgroup Maintainers/Leaders
Finance Subgroup Shared Maintainerships
Infrastructure Subgroup Project & Team Management
Systems Administrator Documentation, Build, QA
Contributors
Yocto Project presentation @ OSCON 2012
11 © 2012 The Linux Foundation. All rights reserved
All logos are trademarks of their respective owners.

12. Development

13. Development Process
• Build system components
• Workflow diagram
• Adjustment points
Yocto Project presentation @ OSCON 2012
13 © 2012 The Linux Foundation. All rights reserved

14. Development Process
→ Build System Components
• BitBake: build engine, follows metadata instructions
• Metadata: instructions for BitBake (recipes, classes, config files)
• OpenEmbedded Core: core set of metadata for OE-based systems
• Poky: a reference build system for the Yocto Project: includes
BitBake & OpenEmbedded Core, produces reference distro
• Package: software component in a package format
• Image: final build output, often a kernel and root filesystem
• Recipe: instructions on how to build a package
• Layer: set of related recipes intended to fit alongside other layers
• Cross-development tools or cross-compiler: tools that provide
binary output for a different architecture from the one they run on
• Toolchain: compiler, debugger, binary utilites, etc. designed to
work together for a specific architecture
• BSP: board support package, contains hardware-specific drivers and
other components for a specific architecture, board, or chipset
Yocto Project presentation @ OSCON 2012
14 © 2012 The Linux Foundation. All rights reserved

15. Development Process
→ Build System Components: BitBake
• Build engine, originally derived from Portage
• Relatively simple, highly configurable
• Operates on metadata
• Sequentially steps through tasks
• Maintainership shared with OpenEmbedded
Yocto Project presentation @ OSCON 2012
15 © 2012 The Linux Foundation. All rights reserved

16. Development Process
→ Build System Components: Layers
• openembedded-core
– Core classes and image recipes
– QEMU-emulated machine definitions
– Maintainership shared with OpenEmbedded
• linux-yocto
– Stable kernel at release time; moving to LTSI kernel
• BSP layers
– meta-intel: Intel processors and SoCs
– meta-ti: Texas Instruments boards
– meta-freescale: Freescale iMx development boards
• Feature layers
– meta-ivi
– meta-rt
• Many more (see git.yoctoproject.org)
Yocto Project presentation @ OSCON 2012
16 © 2012 The Linux Foundation. All rights reserved

17. Development Process
→ Build System Components: Poky
• Reference build system – a representation of the Yocto Project
• Includes BitBake, openembedded-core
• Can build multiple image types
– core-image-minimal
– core-image-base
– core-image-sato
Yocto Project presentation @ OSCON 2012
17 © 2012 The Linux Foundation. All rights reserved

18. Development Process
→ Workflow Diagram
Yocto Project presentation @ OSCON 2012
18 © 2012 The Linux Foundation. All rights reserved

19. Development Process
→ Adjustment Points
• During development
• Configuration
• During build
Yocto Project presentation @ OSCON 2012
19 © 2012 The Linux Foundation. All rights reserved

20. Getting Started

21. Getting Started
• Download
• Configure your environment
• Configure the image
• Build & rebuild
• A look at Hob
Yocto Project presentation @ OSCON 2012
21 © 2012 The Linux Foundation. All rights reserved

22. Getting Started
→ Download
• Tarball (packaged release):
$ wget http://downloads.yoctoproject.org/releases/yocto/
yocto-1.2/poky-denzil-7.0.tar.bz2
$ tar xjf poky-denzil-7.0.tar.bz2
• Git (tip of master branch):
$ git clone git://git.yoctoproject.org/poky.git
• Virtual machine:
$ wget http://downloads.yoctoproject.org/releases/yocto/
yocto-1.2/tools/Build_Appliance.zip
Yocto Project presentation @ OSCON 2012
22 © 2012 The Linux Foundation. All rights reserved

23. Getting Started
→ Configure Your Environment
• Install required packages (Ubuntu shown):
$ sudo apt-get install sed wget subversion git-core coreutils
unzip texi2html texinfo libsdl1.2-dev docbook-utils fop gawk
python-pysqlite2 diffstat make gcc build-essential xsltproc
g++ desktop-file-utils chrpath libgl1-mesa-dev libglu1-mesa-dev
autoconf automake groff libtool xterm libxml-parser-perl
• Set up environment variables:
$ cd poky-denzil-7.0
$ ./oe-init-build-env
### Shell environment set up for builds.
###You can now run 'bitbake <target>‘
Common targets are:
core-image-minimal
core-image-sato
meta-toolchain
. . .
23

24. Getting Started
→ Configure the Image
# This file is your local configuration file and is where all local user settings
# are placed. The comments in this file give some guide to the options a new user
...
# Parallelism Options
#
# These two options control how much parallelism BitBake should use. The first
# option determines how many tasks bitbake should run in parallel:
#
BB_NUMBER_THREADS = "8"
#
# The second option controls how many processes make should run in parallel when
# running compile tasks:
#
PARALLEL_MAKE = "-j 8"
...
# This sets the default machine to be qemux86 if no other machine is selected:
MACHINE ??= "qemux86"
Yocto Project presentation @ OSCON 2012
24 © 2012 The Linux Foundation. All rights reserved

25. Getting Started
→ Build & Rebuild
Pseudo is not present but is required, building this first before the main build
Parsing recipes: 100%
|##############################################################################################
################################################################################| Time: 00:00:53
Parsing of 835 .bb files complete (0 cached, 835 parsed). 1135 targets, 19 skipped, 0 masked, 0 errors.
Build Configuration:
BB_VERSION = "1.15.2"
TARGET_ARCH = "i586"
TARGET_OS = "linux"
MACHINE = "qemux86"
DISTRO = "poky"
DISTRO_VERSION = "1.2+snapshot-20120719"
TUNE_FEATURES = "m32 i586"
TARGET_FPU = ""
meta
meta-yocto = "master:99203edda6f0b09d817454d656c100b7a8806b18"
NOTE: Resolving any missing task queue dependencies
NOTE: Preparing runqueue
NOTE: Executing SetScene Tasks
NOTE: Executing RunQueue Tasks
NOTE: Running task 1 of 63 (ID: 11, /Mondo/poky/poky/meta/recipes-devtools/quilt/quilt-native_0.60.bb, do_fetch)
Yocto Project presentation @ OSCON 2012
25 © 2012 The Linux Foundation. All rights reserved

26. Getting Started
→ Build & Rebuild
NOTE: Running task 1 of 63 (ID: 11, /Mondo/poky/poky/meta/recipes-devtools/quilt/quilt-native_0.60.bb, do_fetch)
NOTE: package quilt-native-0.60-r0: task do_fetch: Started
NOTE: package quilt-native-0.60-r0: task do_fetch: Succeeded
NOTE: Running task 2 of 63 (ID: 7, /Mondo/poky/poky/meta/recipes-devtools/quilt/quilt-native_0.60.bb, do_unpack)
NOTE: package quilt-native-0.60-r0: task do_unpack: Started
NOTE: package quilt-native-0.60-r0: task do_unpack: Succeeded
NOTE: Running task 3 of 63 (ID: 8, /Mondo/poky/poky/meta/recipes-devtools/quilt/quilt-native_0.60.bb, do_patch)
NOTE: package quilt-native-0.60-r0: task do_patch: Started
NOTE: package quilt-native-0.60-r0: task do_patch: Succeeded
NOTE: Running task 4 of 63 (ID: 12, /Mondo/poky/poky/meta/recipes-devtools/quilt/quilt-native_0.60.bb, do_configure)
NOTE: package quilt-native-0.60-r0: task do_configure: Started
NOTE: package quilt-native-0.60-r0: task do_configure: Succeeded
NOTE: Running task 5 of 63 (ID: 13, /Mondo/poky/poky/meta/recipes-devtools/quilt/quilt-native_0.60.bb, do_compile)
NOTE: package quilt-native-0.60-r0: task do_compile: Started
NOTE: package quilt-native-0.60-r0: task do_compile: Succeeded
NOTE: Running task 6 of 63 (ID: 9, /Mondo/poky/poky/meta/recipes-devtools/quilt/quilt-native_0.60.bb, do_install)
NOTE: package quilt-native-0.60-r0: task do_install: Started
NOTE: package quilt-native-0.60-r0: task do_install: Succeeded
NOTE: Running task 7 of 63 (ID: 10, /Mondo/poky/poky/meta/recipes-devtools/quilt/quilt-native_0.60.bb,
do_populate_sysroot)
NOTE: package quilt-native-0.60-r0: task do_populate_sysroot: Started
NOTE: package quilt-native-0.60-r0: task do_populate_sysroot: Succeeded
Yocto Project presentation @ OSCON 2012
26 © 2012 The Linux Foundation. All rights reserved

27. Getting Started
→ A Look at Hob
Yocto Project presentation @ OSCON 2012
27 © 2012 The Linux Foundation. All rights reserved

28. More information at yoctoproject.org
Thank You!