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<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<chapter id='dev-manual-start'>
<title>Getting Started with the Yocto Project</title>
<para>
This chapter introduces the Yocto Project and gives you an idea of what you need to get started.
You can find enough information to set your development host up and build or use images for
hardware supported by the Yocto Project by reading the
<ulink url='http://www.yoctoproject.org/docs/yocto-quick-start/yocto-project-qs.html'>
Yocto Project Quick Start</ulink> located on the <ulink url='http://www.yoctoproject.org'>
Yocto Project website</ulink>.
</para>
<para>
The remainder of this chapter summarizes what is in the Yocto Project Quick Start and provides
some higher level concepts you might want to consider.
</para>
<section id='introducing-the-yocto-project'>
<title>Introducing the Yocto Project</title>
<para>
The Yocto Project is an open-source collaboration project focused on embedded Linux developers.
The project provides a recent Linux kernel along with a set of system commands, libraries,
and system components suitable for the embedded developer.
The Yocto Project also features the Sato reference User Interface should you be dealing with
devices with restricted screens.
</para>
<para>
You can use the Yocto Project, which uses the BitBake build tool, to develop complete Linux
images and user-space applications for architectures based on ARM, MIPS, PowerPC, x86 and x86-64.
You can perform target-level testing and debugging as well as test in a hardware emulated environment.
And, if you are an Eclipse user, you can install an Eclipse Yocto Plug-in to allow you to
develop within that familiar environment.
</para>
</section>
<section id='getting-setup'>
<title>Getting Setup</title>
<para>
Here is what you need to get set up to use the Yocto Project:
<itemizedlist>
<listitem><para><emphasis>Host System:</emphasis> You need a recent release of Fedora,
OpenSUSE, Debian, or Ubuntu.
You should have a reasonably current Linux-based host system.
You should also have about 100 gigabytes of free disk space if you plan on building
images.</para></listitem>
<listitem><para><emphasis>Packages:</emphasis> Depending on your host system (Debian-based or RPM-based),
you need certain packages.
See the <ulink url='http://www.yoctoproject.org/docs/yocto-quick-start/yocto-project-qs.html#packages'>
The Packages</ulink> section in the Yocto Project Quick start for the exact package
requirements.</para></listitem>
<listitem><para><emphasis>Yocto Project Release:</emphasis> You need a release of the Yocto Project.
You can get set up for this one of two ways depending on whether you are going to be contributing
back into the Yocto Project source repository or not.
<itemizedlist>
<listitem><para><emphasis>Tarball Extraction:</emphasis> If you are not going to contribute
back into the Yocto Project you can simply download the Yocto Project release you want
from the website’s <ulink url='http://yoctoproject.org/download'>download page</ulink>.
Once you have the tarball, just extract it into a directory of your choice.
This method does not produce a <filename>poky</filename> Git repository.
You end up simply with a snapshot of Yocto Project files that are based on the
particular release in the tarball.
If you are interested in supported Board Support Packages (BSPs) you can also download
these release tarballs from the same site and locate them in a directory of your
choice.</para></listitem>
<listitem><para><emphasis>Git Repository Method:</emphasis> If you are going to be contributing
back into the Yocto Project you should probably use Git commands to set up a local
<filename>poky</filename> Git repository of from the Yocto Project.
Doing so creates a Git repository with a complete history of changes and allows
you to easily submit your changes upstream to the project.
For an example of how to set up your own local Git repositories see this
<ulink url='https://wiki.yoctoproject.org/wiki/Transcript:_from_git_checkout_to_meta-intel_BSP'>
wiki page</ulink>, which describes how to create both <filename>poky</filename>
and <filename>meta-intel</filename> Git repositories.</para></listitem>
</itemizedlist></para></listitem>
<listitem><para><emphasis>Supported Board Support Packages (BSPs):</emphasis> The same considerations
exist for BSPs.
You can get set up for BSP development one of two ways:
<itemizedlist>
<listitem><para><emphasis>Tarball Extraction:</emphasis> You can download any released
BSP tarball from the same
<ulink url='http://yoctoproject.org/download'>download site</ulink>.
Once you have the tarball just extract it into a directory of your choice.
Again, this method just produces a snapshot of the BSP layer in the form
of a hierarchical directory structure.</para></listitem>
<listitem><para><emphasis>Git Repository Method:</emphasis> If you are working
with a <filename>poky</filename> Git repository you should also set up a
<filename>meta-intel</filename> Git repository.
Typically, you set up the <filename>meta-intel</filename> Git repository inside
the <filename>poky</filename> Git repository.
The same
<ulink url='https://wiki.yoctoproject.org/wiki/Transcript:_from_git_checkout_to_meta-intel_BSP'>
wiki page</ulink> referenced earlier covers how to
set up the <filename>meta-intel</filename> Git repository.</para></listitem>
</itemizedlist></para></listitem>
<listitem><para><emphasis>Eclipse Yocto Plug-in:</emphasis> If you are developing using the
Eclipse Integrated Development Environment (IDE) you will need this plug-in.
See the
<ulink url='http://www.yoctoproject.org/docs/adt-manual/adt-manual.html#setting-up-the-eclipse-ide'>
Setting up the Eclipse IDE</ulink> section in the Yocto Application Development Toolkit (ADT)
User’s Guide for more information.</para></listitem>
</itemizedlist>
</para>
</section>
<section id='building-images'>
<title>Building Images</title>
<para>
The build process creates an entire Linux distribution, including the toolchain, from source.
For more information on this topic, see the
<ulink url='http://www.yoctoproject.org/docs/yocto-quick-start/yocto-project-qs.html#building-image'>
Building an Image</ulink> section in the Yocto Project Quick Start.
</para>
<para>
The build process is as follows:
<orderedlist>
<listitem><para>Make sure you have the Yocto Project files as described in the
previous section.</para></listitem>
<listitem><para>Initialize the build environment by sourcing a build environment
script.</para></listitem>
<listitem><para>Make sure the <filename>conf/local.conf</filename> configuration file is set
up how you want it.
This file defines the target machine architecture and and other build configurations.</para></listitem>
<listitem><para>Build the image using the BitBake command.
If you want information on Bitbake, see the user manual at
<ulink url='http://docs.openembedded.org/bitbake/html'></ulink>.</para></listitem>
<listitem><para>Optionally, you can run the image in the QEMU emulator.</para></listitem>
</orderedlist>
</para>
</section>
<section id='using-pre-built-binaries-and-qemu'>
<title>Using Pre-Built Binaries and QEMU</title>
<para>
Another option you have to get started is to use a pre-built binary.
This scenario is ideal for developing software applications to run on your target hardware.
To do this you need to install the stand-alone Yocto toolchain tarball and then download the
pre-built kernel that you will boot using the QEMU emulator.
Next, you must download the filesystem for your target machine’s architecture.
Finally, you set up the environment to emulate the hardware then start the emulator.
</para>
<para>
You can find details on all these steps in the
<ulink url='http://www.yoctoproject.org/docs/yocto-quick-start/yocto-project-qs.html#using-pre-built'>
Using Pre-Built Binaries and QEMU</ulink> section in the Yocto Project Quick Start.
</para>
</section>
</chapter>
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