yocto project - oscon 7-17-2012

Professional Tools for Embedded Linux

© 2012 The Linux Foundation. All rights reserved.

Jeff Osier-Mixon, Intel Corporation

Yocto Project Community Manager

OSCON | 7/19/2012

The smallest unit of measure,

equal to one septillionth (10-24).

[ yoc-to ]

Agenda: Introduction Development Process Getting Started Q&A

Introduction

Introducing the Yocto Project

• Overall goals

• Project components

• Governance

• Relationships

Yocto Project presentation @ OSCON 2012

© 2012 The Linux Foundation. All rights reserved 4


→ 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




→ Overview

[video: https://vimeo.com/24743626]



https://vimeo.com/24743626


→ 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




→ Governance

• Open source umbrella project

• Organized under the Linux Foundation

• Split governance model

• Technical Leadership Team

• Advisory Board made up of participating organizations


© 2012 The Linux Foundation. All rights reserved

All logos are trademarks of their respective owners. 8

http://en.wikipedia.org/wiki/File:Texas_Instruments_Logo.svg

http://en.wikipedia.org/wiki/File:Intel-logo.svg

http://en.wikipedia.org/wiki/File:Logo_montavista.png

http://en.wikipedia.org/wiki/File:Mentor_logo.png

http://en.wikipedia.org/wiki/File:Wind_River_logo.gif

http://www.enea.com/software/

http://en.wikipedia.org/wiki/File:Huawei.svg


→ Governance: Roles



Advisory Board

Chief Architect

Maintainers/Leaders

Contributors

Voting Members

Advocacy Subgroup

Finance Subgroup

Infrastructure Subgroup Project & Team Management

Documentation, Build, QA

Technical Team

Systems Administrator

Shared Maintainerships


→ Governance: Relationships

Parent organization



OpenEmbedded Project

The Linux Foundation

It’s complicated

Upstream Projects Mutually beneficial

The World

It’s awesome


→ Governance: Relationships


© 2012 The Linux Foundation. All rights reserved

All logos are trademarks of their respective owners. 11

Advisory Board

Chief Architect

Maintainers/Leaders

Contributors

Voting Members

Advocacy Subgroup

Finance Subgroup

Infrastructure Subgroup Project & Team Management

Documentation, Build, QA

Technical Team

Systems Administrator

Shared Maintainerships

upstream projects

http://en.wikipedia.org/wiki/File:Texas_Instruments_Logo.svg

http://en.wikipedia.org/wiki/File:Intel-logo.svg

http://en.wikipedia.org/wiki/File:Logo_montavista.png

http://en.wikipedia.org/wiki/File:Mentor_logo.png

http://en.wikipedia.org/wiki/File:Wind_River_logo.gif

http://www.enea.com/software/

http://en.wikipedia.org/wiki/File:Huawei.svg

Development

Development Process

• Build system components

• Workflow diagram

• Adjustment points



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



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



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)



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



Development Process

→ Workflow Diagram



Development Process

→ Adjustment Points

• During development

• Configuration

• During build



Getting Started

Getting Started

• Download

• Configure your environment

• Configure the image

• Build & rebuild

• A look at Hob



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



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

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"



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)



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



Getting Started

→ A Look at Hob



More information at yoctoproject.org

Thank You!

yocto project - oscon 7-17-2012

Technology

yocto project overviewvideo

reference build system

bitbake build engine

layers crossdevelopment

final build output

core core classes

nightly build structurerelease

rights reservedall logos