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<chapter id='dev-manual-start'>

<title>Getting Started with the Yocto Project</title>

<para>
    This chapter provides procedures related to getting set up to use the
    Yocto Project.
    For a more front-to-end process that takes you from minimally preparing
    a build host through building an image, see the
    <ulink url='&YOCTO_DOCS_QS_URL;'>Yocto Project Quick Start</ulink>.
</para>

<section id='setting-up-the-development-host-to-use-the-yocto-project'>
    <title>Setting Up the Development Host to Use the Yocto Project</title>

    <para>
        This section provides procedures to set up your development host to
        use the Yocto Project.
        You can use the Yocto Project on a native Linux development host or
        you can use
        <ulink url='https://git.yoctoproject.org/cgit/cgit.cgi/crops/about/'>CROPS</ulink>,
        which leverages
        <ulink url='https://www.docker.com/'>Docker Containers</ulink>,
        to prepare any Linux, Mac, or Windows development host.
    </para>

    <para>
        Once your development host is set up to use the Yocto Project,
        further steps are necessary depending on what you want to
        accomplish.
        See the following references for information on how to prepare for
        Board Support Package (BSP) development, kernel development, and
        development using the <trademark class='trade'>Eclipse</trademark> IDE:
        <itemizedlist>
            <listitem><para>
                <emphasis>BSP Development:</emphasis>
                See the
                "<ulink url='&YOCTO_DOCS_BSP_URL;#preparing-your-build-host-to-work-with-bsp-layers'>Preparing Your Build Host to Work With BSP Layers</ulink>"
                section in the Yocto Project Board Support Package (BSP)
                Developer's Guide.
                </para></listitem>
            <listitem><para>
                <emphasis>Kernel Development:</emphasis>
                See the
                "<ulink url='&YOCTO_DOCS_KERNEL_DEV_URL;#preparing-the-build-host-to-work-on-the-kernel'>Preparing the Build Host to Work on the Kernel</ulink>"
                section in the Yocto Project Linux Kernel Development Manual.
                </para></listitem>
            <listitem><para>
                <emphasis>Eclipse Development:</emphasis>
                See the
                "<ulink url='&YOCTO_DOCS_SDK_URL;#sdk-developing-applications-using-eclipse'>Developing Applications Using Eclipse</ulink>"
                section in the Yocto Project Software Development Kit (SDK)
                Developer's Guide.
                </para></listitem>
        </itemizedlist>
    </para>

    <section id='setting-up-a-native-linux-host'>
        <title>Setting Up a Native Linux Host</title>

        <para>
            Follow these steps to prepare a native Linux machine as your
            Yocto Project development host:
            <orderedlist>
                <listitem><para>
                    <emphasis>Use a Supported Linux Distribution:</emphasis>
                    You should have a reasonably current Linux-based host
                    system.
                    You will have the best results with a recent release of
                    Fedora, openSUSE, Debian, Ubuntu, or CentOS as these
                    releases are frequently tested against the Yocto Project
                    and officially supported.
                    For a list of the distributions under validation and their
                    status, see the
                    "<ulink url='&YOCTO_DOCS_REF_URL;#detailed-supported-distros'>Supported Linux Distributions</ulink>" section
                    in the Yocto Project Reference Manual and the wiki page at
                    <ulink url='&YOCTO_WIKI_URL;/wiki/Distribution_Support'>Distribution Support</ulink>.
                    </para></listitem>
                <listitem><para>
                    <emphasis>Have Enough Free Memory:</emphasis>
                    You should have at least 50 Gbytes of free disk space
                    for building images.
                    </para></listitem>
                <listitem><para>
                    <emphasis>Meet Minimal Version Requirements:</emphasis>
                    The OpenEmbedded build system should be able to run on any
                    modern distribution that has the following versions for
                    Git, tar, and Python.
                    <itemizedlist>
                        <listitem><para>
                            Git 1.8.3.1 or greater
                            </para></listitem>
                        <listitem><para>
                            tar 1.27 or greater
                            </para></listitem>
                        <listitem><para>
                            Python 3.4.0 or greater.
                            </para></listitem>
                    </itemizedlist>
                    If your build host does not meet any of these three listed
                    version requirements, you can take steps to prepare the
                    system so that you can still use the Yocto Project.
                    See the
                    "<ulink url='&YOCTO_DOCS_REF_URL;#required-git-tar-and-python-versions'>Required Git, tar, and Python Versions</ulink>"
                    section in the Yocto Project Reference Manual for
                    information.
                    </para></listitem>
                <listitem><para>
                    <emphasis>Install Development Host Packages:</emphasis>
                    Required development host packages vary depending on your
                    build machine and what you want to do with the Yocto
                    Project.
                    Collectively, the number of required packages is large
                    if you want to be able to cover all cases.</para>

                    <para>For lists of required packages for all scenarios,
                    see the
                    "<ulink url='&YOCTO_DOCS_REF_URL;#required-packages-for-the-host-development-system'>Required Packages for the Host Development System</ulink>"
                    section in the Yocto Project Reference Manual.
                    </para></listitem>
            </orderedlist>
        </para>
    </section>

    <section id='setting-up-to-use-crops'>
        <title>Setting Up to Use CROss PlatformS (CROPS)</title>

        <para>
            With
            <ulink url='https://git.yoctoproject.org/cgit/cgit.cgi/crops/about/'>CROPS</ulink>,
            which leverages
            <ulink url='https://www.docker.com/'>Docker Containers</ulink>,
            you can create a Yocto Project development environment that
            is operating system agnostic.
            You can set up a container in which you can develop using the
            Yocto Project on a Windows, Mac, or Linux  machine.
        </para>

        <para>
            Follow these general steps to prepare a Windows, Mac, or Linux
            machine as your Yocto Project development host:
            <orderedlist>
                <listitem><para>
                    <emphasis>Go to the Docker Installation Site:</emphasis>
                    <ulink url='https://www.docker.com/what-docker'>Docker</ulink>
                    is a software container platform that you need to install
                    on the host development machine.
                    To start the installation process, see the
                    <ulink url='https://docs.docker.com/engine/installation/'>Docker Installation</ulink>
                    site.
                    </para></listitem>
                <listitem><para>
                    <emphasis>Choose Your Docker Edition:</emphasis>
                    Docker comes in several editions.
                    For the Yocto Project, the stable community edition
                    (i.e. "Docker CE Stable") is adequate.
                    You can learn more about the Docker editions from the
                    site.
                    </para></listitem>
                <listitem><para>
                    <emphasis>Go the Install Site for Your Platform:</emphasis>
                    Click the link for the Docker edition associated with
                    your development host machine's native software.
                    For example, if your machine is running Microsoft
                    Windows Version 10 and you want the Docker CE Stable
                    edition, click that link under "Supported Platforms".
                    </para></listitem>
                <listitem><para>
                    <emphasis>Understand What You Need:</emphasis>
                    The install page has pre-requisites your machine must
                    meet.
                    Be sure you read through this page and make sure your
                    machine meets the requirements to run Docker.
                    If your machine does not meet the requirements, the page
                    has instructions to handle exceptions.
                    For example, to run Docker on Windows 10, you must have
                    the pro version of the operating system.
                    If you have the home version, you need to install the
                    <ulink url='https://docs.docker.com/toolbox/overview/#ready-to-get-started'>Docker Toolbox</ulink>.
                    </para>

                    <para>Another example is that a Windows machine needs to
                    have Microsoft Hyper-V.
                    If you have a legacy version of the the Microsoft
                    operating system or for any other reason you do not have
                    Microsoft Hyper-V, you would have to enter the BIOS and
                    enable virtualization.
                    </para></listitem>
                <listitem><para>
                    <emphasis>Install the Software:</emphasis>
                    Once you have understood all the pre-requisites, you can
                    download and install the appropriate software.
                    Follow the instructions for your specific machine and
                    the type of the software you need to install.
                    </para></listitem>
                <listitem><para>
                    <emphasis>Optionally Orient Yourself With Dockers:</emphasis>
                    If you are unfamiliar with Dockers and the container
                    concept, you can learn more here -
                    <ulink url='https://docs.docker.com/get-started/'></ulink>.
                    You should be able to launch Docker or the Docker Toolbox
                    and have a terminal shell on your development host.
                    </para></listitem>
                <listitem><para>
                    <emphasis>Set Up the Containers to Use the Yocto Project:</emphasis>
                    Go to
                    <ulink url='https://github.com/crops/docker-win-mac-docs/wiki'></ulink>
                    and follow the directions for your particular
                    development host (i.e. Linux, Mac, or Windows).</para>

                    <para>Once you complete the setup instructions for your
                    machine, you have the Poky, Extensible SDK, and Toaster
                    containers available.
                    You can click those links from the page and learn more
                    about using each of those containers.
                    </para></listitem>
            </orderedlist>
            Once you have a container set up, everything is in place to
            develop just as if you were running on a native Linux machine.
            If you are going to use the Poky container, see the
            "<link linkend='cloning-the-poky-repository'>Cloning the <filename>poky</filename> Repository</link>"
            section.
            If you are going to use the Extensible SDK container, see the
            "<ulink url='&YOCTO_DOCS_SDK_URL;#sdk-extensible'>Using the Extensible SDK</ulink>"
            Chapter in the Yocto Project Software Development Kit (SDK)
            Developer's Guide.
            If you are going to use the Toaster container, see the
            "<ulink url='&YOCTO_DOCS_TOAST_URL;#toaster-manual-setup-and-use'>Setting Up and Using Toaster</ulink>"
            section in the Toaster User Manual.
        </para>
    </section>
</section>

<section id='working-with-yocto-project-source-files'>
    <title>Working With Yocto Project Source Files</title>

    <para>
        This section contains procedures related to locating and securing
        Yocto Project files.
        You establish and use these local files to work on projects.
        <note><title>Notes</title>
            <itemizedlist>
                <listitem><para>
                    For concepts and introductory information about Git as it
                    is used in the Yocto Project, see the
                    "<ulink url='&YOCTO_DOCS_REF_URL;#git'>Git</ulink>"
                    section in the Yocto Project Reference Manual.
                    </para></listitem>
                <listitem><para>
                    For concepts on Yocto Project source repositories, see the
                    "<ulink url='&YOCTO_DOCS_REF_URL;#yocto-project-repositories'>Yocto Project Source Repositories</ulink>"
                    section in the Yocto Project Reference Manual."
                    </para></listitem>
            </itemizedlist>
        </note>
    </para>

    <section id='accessing-source-repositories'>
        <title>Accessing Source Repositories</title>

        <para>
            Yocto Project maintains upstream Git
            <ulink url='&YOCTO_DOCS_REF_URL;#source-repositories'>Source Repositories</ulink>
            that you can examine and access using a browser-based UI:
            <orderedlist>
                <listitem><para>
                    <emphasis>Access Repositories:</emphasis>
                    Open a browser and go to
                    <ulink url='&YOCTO_GIT_URL;'></ulink> to access the
                    GUI-based interface into the Yocto Project source
                    repositories.
                    </para></listitem>
                <listitem><para>
                    <emphasis>Select a Repository:</emphasis>
                    Click on any repository in which you are interested (e.g.
                    <filename>poky</filename>).
                    </para></listitem>
                <listitem><para>
                    <emphasis>Find the URL Used to Clone the Repository:</emphasis>
                    At the bottom of the page, note the URL used to
                    <ulink url='&YOCTO_DOCS_REF_URL;#git-commands-clone'>clone</ulink>
                    that repository (e.g.
                    <filename>&YOCTO_GIT_URL;/poky</filename>).
                    </para></listitem>
                <listitem><para>
                    <emphasis>Examine Change History of the Repository:</emphasis>
                    At the top of the page, click on any branch in which you
                    might be interested (e.g.
                    <filename>&DISTRO_NAME_NO_CAP;</filename>).
                    You can then view the commit log or tree view for that
                    development branch.
                    </para></listitem>
            </orderedlist>
        </para>
    </section>

    <section id='accessing-index-of-releases'>
        <title>Accessing Index of Releases</title>

        <para>
            Yocto Project maintains an Index of Releases area that contains
            related files that contribute to the Yocto Project.
            Rather than Git repositories, these files represent snapshot
            tarballs.
            <note><title>Tip</title>
                The recommended method for accessing Yocto Project
                components is to use Git to clone a repository and work from
                within that local repository.
                The procedure in this section exists should you desire a
                tarball snapshot of any given component.
            </note>
            <orderedlist>
                <listitem><para>
                    <emphasis>Access the Index of Releases:</emphasis>
                    Open a browser and go to
                    <ulink url='&YOCTO_DL_URL;/releases'></ulink> to access the
                    Index of Releases.
                    The list represents released components (e.g.
                    <filename>eclipse-plugin</filename>,
                    <filename>sato</filename>, and so on).
                    <note>
                        The <filename>yocto</filename> directory contains the
                        full array of released Poky tarballs.
                        The <filename>poky</filename> directory in the
                        Index of Releases was historically used for very
                        early releases and exists for retroactive
                        completeness only.
                    </note>
                    </para></listitem>
                <listitem><para>
                    <emphasis>Select a Component:</emphasis>
                    Click on any released component in which you are interested
                    (e.g. <filename>yocto</filename>).
                    </para></listitem>
                <listitem><para>
                    <emphasis>Find the Tarball:</emphasis>
                    Drill down to find the associated tarball.
                    For example, click on <filename>yocto-2.3</filename> to
                    view files associated with the Yocto Project 2.3
                    release (e.g. <filename>poky-pyro-17.0.0tar.bz2</filename>,
                    which is the released Poky tarball).
                    </para></listitem>
                <listitem><para>
                    <emphasis>Download the Tarball:</emphasis>
                    Click a tarball to download and save a snapshot of a
                    given component.
                    </para></listitem>
            </orderedlist>
        </para>
    </section>

    <section id='using-the-downloads-page'>
        <title>Using the Downloads Page</title>

        <para>
            The
            <ulink url='&YOCTO_HOME_URL;'>Yocto Project Website</ulink>
            uses a "Downloads" area from which you can locate and download
            tarballs of any Yocto Project release.
            Rather than Git repositories, these files represent snapshot
            tarballs.
            <note><title>Tip</title>
                The recommended method for accessing Yocto Project
                components is to use Git to clone a repository and work from
                within that local repository.
                The procedure in this section exists should you desire a
                tarball snapshot of any given component.
            </note>
            <orderedlist>
                <listitem><para>
                    <emphasis>Go to the Yocto Project Website:</emphasis>
                    Open The
                    <ulink url='&YOCTO_HOME_URL;'>Yocto Project Website</ulink>
                    in your browser.
                    </para></listitem>
                <listitem><para>
                    <emphasis>Get to the Downloads Area:</emphasis>
                    Click the "Downloads" tab.
                    </para></listitem>
                <listitem><para>
                    <emphasis>Select the Type of Files:</emphasis>
                    Click the type of files you want (i.e "Build System",
                    "Tools", or "Board Support Packages (BSPs)".
                    </para></listitem>
                <listitem><para>
                    <emphasis>Locate and Download the Tarball:</emphasis>
                    From the list of releases, locate the appropriate
                    download link and download the files.
                    </para></listitem>
            </orderedlist>
        </para>
    </section>

    <section id='cloning-the-poky-repository'>
        <title>Cloning the <filename>poky</filename> Repository</title>

        <para>
            To use the Yocto Project, you need a release of the Yocto Project
            locally installed on your development system.
            The locally installed set of files is referred to as the
            <ulink url='&YOCTO_DOCS_REF_URL;#source-directory'>Source Directory</ulink>
            in the Yocto Project documentation.
        </para>

        <para>
            You create your Source Directory by using
            <ulink url='&YOCTO_DOCS_REF_URL;#git'>Git</ulink> to clone a local
            copy of the upstream <filename>poky</filename> repository.
            <note><title>Tip</title>
                The preferred method of getting the Yocto Project Source
                Directory set up is to clone the repository.
            </note>
            Working from a copy of the upstream repository allows you
            to contribute back into the Yocto Project or simply work with
            the latest software on a development branch.
            Because Git maintains and creates an upstream repository with
            a complete history of changes and you are working with a local
            clone of that repository, you have access to all the Yocto
            Project development branches and tag names used in the upstream
            repository.
        </para>

        <para>
            Follow these steps to create a local version of the
            upstream
            <ulink url='&YOCTO_DOCS_REF_URL;#poky'><filename>poky</filename></ulink>
            Git repository.
            <orderedlist>
                <listitem><para>
                    <emphasis>Set Your Directory:</emphasis>
                    Be in the directory where you want to create your local
                    copy of poky.
                    </para></listitem>
                <listitem><para>
                    <emphasis>Clone the Repository:</emphasis>
                    The following command clones the repository and uses
                    the default name "poky" for your local repository:
                    <literallayout class='monospaced'>
     $ git clone git://git.yoctoproject.org/poky
     Cloning into 'poky'...
     remote: Counting objects: 367178, done.
     remote: Compressing objects: 100% (88161/88161), done.
     remote: Total 367178 (delta 272761), reused 366942 (delta 272525)
     Receiving objects: 100% (367178/367178), 133.26 MiB | 6.40 MiB/s, done.
     Resolving deltas: 100% (272761/272761), done.
     Checking connectivity... done.
                    </literallayout>
                    Unless you specify a specific development branch or
                    tag name, Git clones the "master" branch, which results
                    in a snapshot of the latest development changes for
                    "master".</para>

                    <para>Once the repository is created, you can change to
                    that directory and check its status.
                    Here, the single "master" branch exists on your system
                    and by default, it is checked out:
                    <literallayout class='monospaced'>
     $ cd ~/poky
     $ git status
     On branch master
     Your branch is up-to-date with 'origin/master'.
     nothing to commit, working directory clean
     $ git branch
     * master
                    </literallayout>
                    Your local repository of poky is identical to the
                    upstream poky repository at the time from which it was
                    cloned.
                    </para></listitem>
            </orderedlist>
        </para>
    </section>

    <section id='checking-out-by-branch-in-poky'>
        <title>Checking Out by Branch in Poky</title>

        <para>
            When you clone the upstream poky repository, you have access to
            all its development branches.
            Each development branch in a repository is unique as it forks
            off the "master" branch.
            To see and use the files of a particular development branch
            locally, you need to know the branch name and then specifically
            check out that development branch.
            <note>
                Checking out an active development branch by branch name
                gives you a snapshot of that particular branch at the time
                you check it out.
                Further development on top of the branch that occurs after
                check it out can occur.
            </note>
            <orderedlist>
                <listitem><para>
                    <emphasis>Switch to the Poky Directory:</emphasis>
                    If you have a local poky Git repository, switch to that
                    directory.
                    If you do not have the local copy of poky, see the
                    "<link linkend='cloning-the-poky-repository'>Cloning the <filename>poky</filename> Repository</link>"
                    section.
                    </para></listitem>
                <listitem><para>
                    <emphasis>Determine Existing Branch Names:</emphasis>
                    <literallayout class='monospaced'>
     $ git branch -a
     * master
       remotes/origin/1.1_M1
       remotes/origin/1.1_M2
       remotes/origin/1.1_M3
       remotes/origin/1.1_M4
       remotes/origin/1.2_M1
       remotes/origin/1.2_M2
       remotes/origin/1.2_M3
           .
           .
           .
       remotes/origin/master-next
       remotes/origin/master-next2
       remotes/origin/morty
       remotes/origin/pinky
       remotes/origin/purple
       remotes/origin/pyro
                    </literallayout>
                    </para></listitem>
                <listitem><para>
                    <emphasis>Checkout the Branch:</emphasis>
                    Checkout the development branch in which you want to work.
                    For example, to access the files for the Yocto Project
                    2.3 Release (Pyro), use the following command:
                    <literallayout class='monospaced'>
     $ git checkout -b pyro origin/pyro
     Branch pyro set up to track remote branch pyro from origin.
     Switched to a new branch 'pyro'
                    </literallayout>
                    The previous command checks out the "pyro" development
                    branch and reports that the branch is tracking the upstream
                    "origin/pyro" branch.</para>

                    <para>The following command displays the branches
                    that are now part of your local poky repository.
                    The asterisk character indicates the branch that is
                    currently checked out for work:
                    <literallayout class='monospaced'>
     $ git branch
       master
     * pyro
                    </literallayout>
                    </para></listitem>
            </orderedlist>
        </para>
    </section>

    <section id='checkout-out-by-tag-in-poky'>
        <title>Checking Out by Tag in Poky</title>

        <para>
            Similar to branches, the upstream repository uses tags
            to mark specific commits associated with significant points in
            a development branch (i.e. a release point or stage of a
            release).
            You might want to set up a local branch based on one of those
            points in the repository.
            The process is similar to checking out by branch name except you
            use tag names.
            <note>
                Checking out a branch based on a tag gives you a
                stable set of files not affected by development on the
                branch above the tag.
            </note>
            <orderedlist>
                <listitem><para>
                    <emphasis>Switch to the Poky Directory:</emphasis>
                    If you have a local poky Git repository, switch to that
                    directory.
                    If you do not have the local copy of poky, see the
                    "<link linkend='cloning-the-poky-repository'>Cloning the <filename>poky</filename> Repository</link>"
                    section.
                    </para></listitem>
                <listitem><para>
                    <emphasis>Fetch the Tag Names:</emphasis>
                    To checkout the branch based on a tag name, you need to
                    fetch the upstream tags into your local repository:
                    <literallayout class='monospaced'>
     $ git fetch --tags
     $
                    </literallayout>
                    </para></listitem>
                <listitem><para>
                    <emphasis>List the Tag Names:</emphasis>
                    You can list the tag names now:
                    <literallayout class='monospaced'>
     $ git tag
     1.1_M1.final
     1.1_M1.rc1
     1.1_M1.rc2
     1.1_M2.final
     1.1_M2.rc1
        .
        .
        .
     yocto-2.2
     yocto-2.2.1
     yocto-2.3
     yocto_1.5_M5.rc8
                    </literallayout>
                    </para></listitem>
                <listitem><para>
                    <emphasis>Checkout the Branch:</emphasis>
                    <literallayout class='monospaced'>
     $ git checkout tags/2.2_M2 -b my_yocto_2.2_M2
     Switched to a new branch 'my_yocto_2.2_M2'
     $ git branch
       master
     * my_yocto_2.2_M2
                    </literallayout>
                    The previous command creates and checks out a local
                    branch named "my_yocto_2.2_M2", which is based on
                    the commit in the upstream poky repository that has
                    the same tag.
                    In this example, the files you have available locally
                    as a result of the <filename>checkout</filename>
                    command are a snapshot of the
                    "morty" development branch at the point where
                    milestone two was reached.
                    </para></listitem>
            </orderedlist>
        </para>
    </section>
</section>

<section id='performing-a-simple-build'>
    <title>Performing a Simple Build</title>

    <para>
        Several methods exist that allow you to build an image within the
        Yocto Project.
        This procedure shows how to build an image using BitBake from a
        Linux host.
        <note><title>Notes</title>
            <itemizedlist>
                <listitem><para>
                    For information on how to build an image using
                    <ulink url='&YOCTO_DOCS_REF_URL;#toaster-term'>Toaster</ulink>,
                    see the
                    <ulink url='&YOCTO_DOCS_TOAST_URL;'>Yocto Project Toaster Manual</ulink>.
                    </para></listitem>
                <listitem><para>
                    For information on how to use
                    <filename>devtool</filename> to build images, see the
                    "<ulink url='&YOCTO_DOCS_SDK_URL;#using-devtool-in-your-sdk-workflow'>Using <filename>devtool</filename> in Your SDK Workflow</ulink>"
                    section in the Yocto Project Software Development Kit
                    (SDK) Developer's Guide.
                    </para></listitem>
            </itemizedlist>
        </note>
    </para>

    <para>
        The build process creates an entire Linux distribution from source
        and places it in your
        <ulink url='&YOCTO_DOCS_REF_URL;#build-directory'>Build Directory</ulink>
        under <filename>tmp/deploy/images</filename>.
        For detailed information on the build process using BitBake, see the
        "<ulink url='&YOCTO_DOCS_REF_URL;#images-dev-environment'>Images</ulink>"
        section in the Yocto Project Reference Manual.
        You can also reference the
        "<ulink url='&YOCTO_DOCS_QS_URL;#qs-building-images'>Building Images</ulink>"
        section in the Yocto Project Quick Start.
    </para>

    <para>
        The following figure and list overviews the build process:
        <imagedata fileref="figures/bitbake-build-flow.png" width="7in" depth="4in" align="center" scalefit="1" />
        <orderedlist>
            <listitem><para>
                <emphasis>Set up Your Host Development System to Support
                Development Using the Yocto Project</emphasis>:
                See the
                "<ulink url='&YOCTO_DOCS_QS_URL;#yp-resources'>Setting Up to Use the Yocto Project</ulink>"
                section in the Yocto Project Quick Start for options on how
                to get a build host ready to use the Yocto Project.
                </para></listitem>
            <listitem><para>
                <emphasis>Initialize the Build Environment:</emphasis>
                Initialize the build environment by sourcing a build
                environment script (i.e.
                <ulink url='&YOCTO_DOCS_REF_URL;#structure-core-script'><filename>&OE_INIT_FILE;</filename></ulink>
                or
                <ulink url='&YOCTO_DOCS_REF_URL;#structure-memres-core-script'><filename>oe-init-build-env-memres</filename></ulink>).
                </para></listitem>
            <listitem><para>
                <emphasis>Make Sure Your <filename>local.conf</filename>
                File is Correct:</emphasis>
                Ensure the <filename>conf/local.conf</filename> configuration
                file, which is found in the
                <ulink url='&YOCTO_DOCS_REF_URL;#build-directory'>Build Directory</ulink>,
                is set up how you want it.
                This file defines many aspects of the build environment
                including the target machine architecture through the
                <filename><ulink url='&YOCTO_DOCS_REF_URL;#var-MACHINE'>MACHINE</ulink></filename> variable,
                the packaging format used during the build
                (<ulink url='&YOCTO_DOCS_REF_URL;#var-PACKAGE_CLASSES'><filename>PACKAGE_CLASSES</filename></ulink>),
                and a centralized tarball download directory through the
                <filename><ulink url='&YOCTO_DOCS_REF_URL;#var-DL_DIR'>DL_DIR</ulink></filename> variable.
                </para></listitem>
            <listitem><para>
                <emphasis>Build the Image:</emphasis>
                Build the image using the <filename>bitbake</filename> command.
                For example, the following command builds the
                <filename>core-image-minimal</filename> image:
                <literallayout class='monospaced'>
     $ bitbake core-image-minimal
                </literallayout>
                For information on BitBake, see the
                <ulink url='&YOCTO_DOCS_BB_URL;'>BitBake User Manual</ulink>.
                </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 pre-built binaries.
        The Yocto Project provides many types of binaries with each release.
        See the "<ulink url='&YOCTO_DOCS_REF_URL;#ref-images'>Images</ulink>"
        chapter in the Yocto Project Reference Manual
        for descriptions of the types of binaries that ship with a Yocto Project
        release.
    </para>

    <para>
        Using a pre-built binary is ideal for developing software
        applications to run on your target hardware.
        To do this, you need to be able to access the appropriate
        cross-toolchain tarball for the architecture on which you are
        developing.
        If you are using an SDK type image, the image ships with the complete
        toolchain native to the architecture (i.e. a toolchain designed to
        run on the
        <ulink url='&YOCTO_DOCS_REF_URL;#var-SDKMACHINE'><filename>SDKMACHINE</filename></ulink>).
        If you are not using an SDK type image, you need to separately download
        and install the stand-alone Yocto Project cross-toolchain tarball.
        See the
        "<ulink url='&YOCTO_DOCS_SDK_URL;#sdk-appendix-obtain'>Obtaining the SDK</ulink>"
        appendix in the Yocto Project Software Development Kit (SDK)
        Developer's Guide for more information on locating and installing
        cross-toolchains.
    </para>

    <para>
        Regardless of the type of image you are using, you need to download the pre-built kernel
        that you will boot in the QEMU emulator and then download and extract the target root
        filesystem for your target machine’s architecture.
        You can get architecture-specific binaries and file systems from
        <ulink url='&YOCTO_MACHINES_DL_URL;'>machines</ulink>.
        You can get installation scripts for stand-alone toolchains from
        <ulink url='&YOCTO_TOOLCHAIN_DL_URL;'>toolchains</ulink>.
        Once you have all your files, you set up the environment to emulate the hardware
        by sourcing an environment setup script.
        Finally, you start the QEMU emulator.
        You can find details on all these steps in the
        <ulink url='&YOCTO_DOCS_SDK_URL;#sdk-manual'>Yocto Project Software Development Kit (SDK) Developer's Guide</ulink>.
        You can learn more about using QEMU with the Yocto Project in the
        "<link linkend='dev-manual-qemu'>Using the Quick EMUlator (QEMU)</link>"
        section.
    </para>
</section>
-->
</chapter>
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