path: root/documentation/sdk-manual/sdk-appendix-obtain.xml

<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
[<!ENTITY % poky SYSTEM "../poky.ent"> %poky; ] >

<appendix id='sdk-appendix-obtain'>

<title>Obtaining the SDK</title>

<section id='sdk-locating-pre-built-sdk-installers'>
    <title>Locating Pre-Built SDK Installers</title>

    <para>
        You can use existing, pre-built toolchains by locating and running
        an SDK installer script that ships with the Yocto Project.
        Using this method, you select and download an architecture-specific
        SDK installer and then run the script to hand-install the
        toolchain.
    </para>

    <para>
        Follow these steps to locate and hand-install the toolchain:
        <orderedlist>
            <listitem><para>
                <emphasis>Go to the Installers Directory:</emphasis>
                Go to <ulink url='&YOCTO_TOOLCHAIN_DL_URL;'></ulink>
                </para></listitem>
            <listitem><para>
                <emphasis>Open the Folder for Your Development System:</emphasis>
                Open the folder that matches your host development system
                (i.e. <filename>i686</filename> for 32-bit machines or
                <filename>x86_64</filename> for 64-bit machines).
                </para></listitem>
            <listitem><para>
                <emphasis>Locate and Download the SDK Installer:</emphasis>
                You need to find and download the installer appropriate for
                your development system, target hardware, and image type.
                </para>

                <para>The installer files (<filename>*.sh</filename>) follow
                this naming convention:
                <literallayout class='monospaced'>
     poky-eglibc-<replaceable>host_system</replaceable>-core-image-<replaceable>type</replaceable>-<replaceable>arch</replaceable>-toolchain-ext-<replaceable>release</replaceable>.sh

     Where:
         <replaceable>host_system</replaceable> is a string representing your development system:
                i686 or x86_64.

         <replaceable>type</replaceable> is a string representing either a "sato" or "minimal"
                image.

         <replaceable>arch</replaceable> is a string representing the target architecture:
                aarch64, armv5e, core2-64, coretexa8hf-neon, i586, mips3242,
                mips64, or ppc7400.

         <replaceable>release</replaceable> is the version of Yocto Project.

         NOTE:
            The standard SDK installer does not have the "-ext" string as
            part of the filename.

                </literallayout>
                The toolchains provided by the Yocto Project are based off of
                the <filename>core-image-sato</filename> and
                <filename>core-image-minimal</filename> images and contain
                libraries appropriate for developing against those images.
                </para>

                <para>For example, if your host development system is a
                64-bit x86 system and you are need an extended SDK for a
                64-bit core2 target, go into the <filename>x86_64</filename>
                folder and download the following installer:
                <literallayout class='monospaced'>
     poky-glibc-x86_64-core-image-sato-core2-64-toolchain-ext-&DISTRO;.sh
                </literallayout>
                </para></listitem>
            <listitem><para>
                <emphasis>Run the Installer:</emphasis>
                Be sure you have execution privileges and run the installer.
                Following is an example from the <filename>Downloads</filename>
                directory:
                <literallayout class='monospaced'>
     $ ~/Downloads/poky-glibc-x86_64-core-image-sato-core2-64-toolchain-ext-&DISTRO;.sh
                </literallayout>
                </para></listitem>
        </orderedlist>
    </para>
</section>

<section id='sdk-building-an-sdk-installer'>
    <title>Building an SDK Installer</title>

    <para>
        As an alternative to locating and downloading a SDK installer,
        you can build the SDK installer.
        Follow these steps:
        <orderedlist>
            <listitem><para>
                <emphasis>Set Up the Build Environment:</emphasis>
                Be sure you are set up to use BitBake in a shell.
                See the
                "<ulink url='&YOCTO_DOCS_QS_URL;#qs-building-images'>Building Images</ulink>"
                section in the Yocto Project Quick Start for steps that
                show you how to set up the Yocto Project environment.
                </para></listitem>
            <listitem><para>
                <emphasis>Make Sure You Are Building an Installer for the Correct Machine:</emphasis>
                Check to be sure that your
                <ulink url='&YOCTO_DOCS_REF_URL;#var-MACHINE'><filename>MACHINE</filename></ulink>
                variable in the <filename>local.conf</filename> file in your
                <ulink url='&YOCTO_DOCS_REF_URL;#build-directory'>Build Directory</ulink>
                matches the architecture for which you are building.
                </para></listitem>
            <listitem><para>
                <emphasis>Make Sure Your SDK Machine is Correctly Set:</emphasis>
                If you are building a toolchain designed to run on an
                architecture that differs from your current development host
                machine (i.e. the build machine), be sure that the
                <ulink url='&YOCTO_DOCS_REF_URL;#var-SDKMACHINE'><filename>SDKMACHINE</filename></ulink>
                variable in the <filename>local.conf</filename> file in your
                Build Directory is correctly set.
                </para></listitem>
            <listitem><para>
                <emphasis>Build the SDK Installer:</emphasis>
                To build the SDK installer for a standard SDK and populate
                the SDK image, use the following command form.
                Be sure to replace <replaceable>image</replaceable> with
                an image (e.g. "core-image-sato"):
                <literallayout class='monospaced'>
     $ bitbake <replaceable>image</replaceable> -c populate_sdk
                </literallayout>
                You can do the same for the extensible SDK using this command
                form:
                <literallayout class='monospaced'>
     $ bitbake <replaceable>image</replaceable> -c populate_sdk_ext
                </literallayout>
                These commands result in a SDK installer that contains the
                sysroot that matches your target root filesystem.</para>

                <para>When the <filename>bitbake</filename> command completes,
                the SDK installer will be in
                <filename>tmp/deploy/sdk</filename> in the Build Directory.
                <note><title>Notes</title>
                    <itemizedlist>
                        <listitem><para>
                            By default, this toolchain does not build static
                            binaries.
                            If you want to use the toolchain to build these
                            types of libraries, you need to be sure your SDK
                            has the appropriate static development libraries.
                            Use the
                            <ulink url='&YOCTO_DOCS_REF_URL;#var-TOOLCHAIN_TARGET_TASK'><filename>TOOLCHAIN_TARGET_TASK</filename></ulink>
                            variable inside your <filename>local.conf</filename>
                            file to install the appropriate library packages
                            in the SDK.
                            Following is an example using
                            <filename>libc</filename> static development
                            libraries:
                            <literallayout class='monospaced'>
     TOOLCHAIN_TARGET_TASK_append = " libc-staticdev"
                            </literallayout>
                            </para></listitem>
                        <listitem><para>
                            For additional information on building the
                            installer, see the
                            <ulink url='https://wiki.yoctoproject.org/wiki/TipsAndTricks/RunningEclipseAgainstBuiltImage'>Cookbook guide to Making an Eclipse Debug Capable Image</ulink>
                            wiki page.
                            </para></listitem>
                    </itemizedlist>
                </note>
            </para></listitem>
            <listitem><para>
                <emphasis>Run the Installer:</emphasis>
                You can now run the SDK installer from
                <filename>tmp/deploy/sdk</filename> in the Build Directory.
                Following is an example:
                <literallayout class='monospaced'>
     $ cd ~/poky/build/tmp/deploy/sdk
     ./poky-glibc-x86_64-core-image-sato-core2-64-toolchain-ext-&DISTRO;.sh
                </literallayout>
                </para></listitem>
        </orderedlist>
    </para>
</section>

<section id='sdk-extracting-the-root-filesystem'>
    <title>Extracting the Root Filesystem</title>

    <para>
        After installing the toolchain, for some use cases you
        might need to separately extract a root filesystem:
        <itemizedlist>
            <listitem><para>You want to boot the image using NFS.
                </para></listitem>
            <listitem><para>You want to use the root filesystem as the
                target sysroot.
                For example, the Eclipse IDE environment with the Eclipse
                Yocto Plug-in installed allows you to use QEMU to boot
                under NFS.</para></listitem>
            <listitem><para>You want to develop your target application
                using the root filesystem as the target sysroot.
                </para></listitem>
        </itemizedlist>
    </para>

    <para>
        To extract the root filesystem, first <filename>source</filename>
        the cross-development environment setup script to establish
        necessary environment variables.
        If you built the toolchain in the Build Directory, you will find
        the toolchain environment script in the
        <filename>tmp</filename> directory.
        If you installed the toolchain by hand, the environment setup
        script is located in <filename>/opt/poky/&DISTRO;</filename>.
    </para>

    <para>
        After sourcing the environment script, use the
        <filename>runqemu-extract-sdk</filename> command and provide the
        filesystem image.
    </para>

    <para>
        Following is an example.
        The second command sets up the environment.
        In this case, the setup script is located in the
        <filename>/opt/poky/&DISTRO;</filename> directory.
        The third command extracts the root filesystem from a previously
        built filesystem that is located in the
        <filename>~/Downloads</filename> directory.
        Furthermore, this command extracts the root filesystem into the
        <filename>qemux86-sato</filename> directory:
        <literallayout class='monospaced'>
     $ cd ~
     $ source /opt/poky/&DISTRO;/environment-setup-i586-poky-linux
     $ runqemu-extract-sdk \
        ~/Downloads/core-image-sato-sdk-qemux86-2011091411831.rootfs.tar.bz2 \
        $HOME/qemux86-sato
        </literallayout>
        You could now point to the target sysroot at
        <filename>qemux86-sato</filename>.
    </para>
</section>

<section id='sdk-installed-standard-sdk-directory-structure'>
    <title>Installed Standard SDK Directory Structure</title>

    <para>
        The following figure shows the resulting directory structure after
        you install the Standard SDK by running the <filename>*.sh</filename>
        SDK installation script:
    </para>

    <para>
        <imagedata fileref="figures/sdk-installed-standard-sdk-directory.png" scale="60" align="center" />
    </para>

    <para>
        The installed SDK consists of an environment setup script for the SDK,
        a configuration file for the target, a version file for the target,
        and the root filesystem (<filename>sysroots</filename>) needed to
        develop objects for the target system.
    </para>

    <para>
        Within the figure, italicized text is used to indicate replaceable
        portions of the file or directory name.
        For example,
        <replaceable>install_dir</replaceable>/<replaceable>version</replaceable>
        is the directory where the SDK is installed.
        By default, this directory is <filename>/opt/poky/</filename>.
        And, <replaceable>version</replaceable> represents the specific
        snapshot of the SDK (e.g. <filename>&DISTRO;</filename>).
        Furthermore, <replaceable>target</replaceable> represents the target
        architecture (e.g. <filename>i586</filename>) and
        <replaceable>host</replaceable> represents the development system's
        architecture (e.g. <filename>x86_64</filename>).
        Thus, the complete names of the two directories within the
        <filename>sysroots</filename> could be
        <filename>i586-poky-linux</filename> and
        <filename>x86_64-pokysdk-linux</filename> for the target and host,
        respectively.
    </para>
</section>

<section id='sdk-installed-extensible-sdk-directory-structure'>
    <title>Installed Extensible SDK Directory Structure</title>

    <para>
        The following figure shows the resulting directory structure after
        you install the Extensible SDK by running the <filename>*.sh</filename>
        SDK installation script:
    </para>

    <para>
        <imagedata fileref="figures/sdk-installed-extensible-sdk-directory.png" scale="60" align="center" />
    </para>

    <para>
        The installed directory structure for the extensible SDK is quite
        different than the installed structure for the standard SDK.
        The extensible SDK does not separate host and target parts in the
        same manner as does the standard SDK.
        The extensible SDK uses an embedded copy of the OpenEmbedded
        build system, which has its own sysroots.
    </para>

    <para>
        Of note in the directory structure are an environment setup script
        for the SDK, a configuration file for the target, a version file for
        the target, and a log file for the OpenEmbedded build system
        preparation script run by the installer.
    </para>

    <para>
        Within the figure, italicized text is used to indicate replaceable
        portions of the file or directory name.
        For example,
        <replaceable>install_dir</replaceable> is the directory where the SDK
        is installed, which is <filename>poky_sdk</filename> by default.
        <replaceable>target</replaceable> represents the target
        architecture (e.g. <filename>i586</filename>) and
        <replaceable>host</replaceable> represents the development system's
        architecture (e.g. <filename>x86_64</filename>).
    </para>
</section>

</appendix>
<!--
vim: expandtab tw=80 ts=4
-->