documentation/adt-manual/adt-eclipse.xml: Initial draft for Eclipse chapter.
This is the initial draft of the Eclipse chapter. (From OE-Core rev: 44512573d62fa5e209bf227d6811f9a94ec42372) Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<chapter id='adt-eclipse'>
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<title>Yocto Project Kernel Architecture and Use Manual</title>
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<section id='eclipse'>
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<title>Introduction</title>
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<title>Working Within Eclipse</title>
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<para>
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The Yocto Project presents the kernel as a fully patched, history-clean git
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repository.
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The git tree represents the selected features, board support,
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and configurations extensively tested by Yocto Project.
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The Yocto Project kernel allows the end user to leverage community
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best practices to seamlessly manage the development, build and debug cycles.
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The Eclipse IDE is a popular development environment and it fully supports
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development using Yocto Project.
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When you install and configure the Eclipse Yocto Project Plug-in into
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the Eclipse IDE you maximize your Yocto Project design experience.
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Installing and configuring the Plug-in results in an environment that
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has extensions specifically designed to let you more easily develop software.
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These extensions allow for cross-compilation and deployment and execution of
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your output into a QEMU emulation session.
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You can also perform cross-debugging and profiling.
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The environment also has a suite of tools that allows you to perform
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remote profiling, tracing, collection of power data, collection of
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latency data, and collection of performance data.
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</para>
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<para>
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This manual describes the Yocto Project kernel by providing information
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on its history, organization, benefits, and use.
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The manual consists of two sections:
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<itemizedlist>
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<listitem><para>Concepts - Describes concepts behind the kernel.
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You will understand how the kernel is organized and why it is organized in
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the way it is. You will understand the benefits of the kernel's organization
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and the mechanisms used to work with the kernel and how to apply it in your
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design process.</para></listitem>
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<listitem><para>Using the Kernel - Describes best practices and "how-to" information
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that lets you put the kernel to practical use. Some examples are "How to Build a
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Project Specific Tree", "How to Examine Changes in a Branch", and "Saving Kernel
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Modifications."</para></listitem>
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</itemizedlist>
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This section describes how to install and configure the Eclipse IDE
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Yocto Plug-in and how to use it to develop your Yocto Project.
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</para>
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<section id='setting-up-the-eclipse-ide'>
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<title>Setting Up the Eclipse IDE</title>
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<para>
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For more information on the kernel, see the following links:
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<itemizedlist>
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<listitem><para><ulink url='http://ldn.linuxfoundation.org/book/1-a-guide-kernel-development-process'></ulink></para></listitem>
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<listitem><para><ulink url='http://userweb.kernel.org/~akpm/stuff/tpp.txt'></ulink></para></listitem>
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<listitem><para><ulink url='http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob_plain;f=Documentation/HOWTO;hb=HEAD'></ulink></para></listitem>
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</itemizedlist>
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To develop within the Eclipse IDE you need to do the following:
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<orderedlist>
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<listitem><para>Be sure the optimal version of Eclipse IDE
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is installed.</para></listitem>
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<listitem><para>Install required Eclipse plug-ins prior to installing
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the Eclipse Yocto Plug-in.</para></listitem>
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<listitem><para>Configure the Eclipse Yocto Plug-in.</para></listitem>
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</orderedlist>
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</para>
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<section id='installing-eclipse-ide'>
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<title>Installing Eclipse IDE</title>
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<para>
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You can find more information on Yocto Project by visiting the website at
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<ulink url='http://www.yoctoproject.org'></ulink>.
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It is recommended that you have the Helios 3.6.1 version of the
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Eclipse IDE installed on your development system.
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If you don’t have this version you can find it at
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<ulink url='http://www.eclipse.org/downloads'></ulink>.
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From that site, choose the Eclipse Classic version.
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This version contains the Eclipse Platform, the Java Development
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Tools (JDT), and the Plug-in Development Environment.
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</para>
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<para>
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Once you have downloaded the tarball, extract it into a clean
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directory and complete the installation.
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</para>
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<para>
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One issue exists that you need to be aware of regarding the Java
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Virtual machine’s garbage collection (GC) process.
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The GC process does not clean up the permanent generation
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space (PermGen).
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This space stores meta-data descriptions of classes.
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The default value is set too small and it could trigger an
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out-of-memory error such as the following:
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<literallayout class='monospaced'>
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Java.lang.OutOfMemoryError: PermGen space
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</literallayout>
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</para>
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<para>
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This error causes the application to hang.
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</para>
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<para>
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To fix this issue you can use the ‐‐vmargs option when you start
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Eclipse to increase the size of the permanent generation space:
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<literallayout class='monospaced'>
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eclipse ‐‐vmargs ‐‐XX:PermSize=256M
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</literallayout>
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</para>
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</section>
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<section id='installing-required-plug-ins-and-the-eclipse-yocto-plug-in'>
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<title>Installing Required Plug-ins and the Eclipse Yocto Plug-in</title>
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<para>
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Before installing the Yocto Plug-in you need to be sure that the
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CDT 7.0, RSE 3.2, and Autotools plug-ins are all installed.
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After installing these three plug-ins, you can install the
|
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Eclipse Yocto Plug-in.
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Use the following URLs for the plug-ins:
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<orderedlist>
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<listitem><para><emphasis>CDT 7.0</emphasis> –
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<ulink url='http://download.eclipse.org/tools/cdt/releases/helios/'></ulink>:
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For CDT main features select the checkbox so you get all items.
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For CDT optional features expand the selections and check
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“C/C++ Remote Launch”.</para></listitem>
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<listitem><para><emphasis>RSE 3.2</emphasis> –
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<ulink url='http://download.eclipse.org/tm/updates/3.2'></ulink>:
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Check the box next to “TM and RSE Main Features” so you select all
|
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those items.
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Note that all items in the main features depend on 3.2.1 version.
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Expand the items under “TM and RSE Uncategorized 3.2.1” and
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select the following: “Remote System Explorer End-User Runtime”,
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“Remote System Explorer Extended SDK”, “Remote System Explorer User Actions”,
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“RSE Core”, “RSE Terminals UI”, and “Target Management Terminal”.</para></listitem>
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<listitem><para><emphasis>Autotools</emphasis> –
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<ulink url='http://download.eclipse.org/technology/linuxtools/update'></ulink>:
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Expand the items under “Linux Tools” and select “Autotools support
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for CDT (Incubation)”.</para></listitem>
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<listitem><para><emphasis>Yocto Plug-in</emphasis> –
|
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<ulink url='http://www.yoctoproject.org/downloads/eclipse-plugin/'></ulink>:
|
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Check the box next to “Development tools & SDKs for Yocto Linux”
|
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to select all the items.</para></listitem>
|
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</orderedlist>
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</para>
|
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<para>
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Follow these general steps to install a plug-in:
|
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<orderedlist>
|
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<listitem><para>From within the Eclipse IDE select the
|
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“Install New Software” item from the “Help” menu.</para></listitem>
|
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<listitem><para>Click “Add…” in the “Work with:” area.</para></listitem>
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<listitem><para>Enter the URL for the repository and leave the “Name”
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field blank.</para></listitem>
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<listitem><para>Check the boxes next to the software you need to
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install and then complete the installation.
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For information on the specific software packages you need to include,
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see the previous list.</para></listitem>
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</orderedlist>
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</para>
|
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</section>
|
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|
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<section id='configuring-the-plug-in'>
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<title>Configuring the Plug-in</title>
|
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<para>
|
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Configuring the Eclipse Yocto Plug-in involves choosing the Cross
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Compiler Options, selecting the Target Architecture, and choosing
|
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the Target Options.
|
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These settings are the default settings for all projects.
|
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You do have opportunities to change them later if you choose to when
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you configure the project.
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See “Configuring the Cross Toolchain” section later in the manual.
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</para>
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<para>
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To start, you need to do the following from within the Eclipse IDE:
|
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<itemizedlist>
|
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<listitem><para>Choose Windows -> Preferences to display
|
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the Preferences Dialog</para></listitem>
|
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<listitem><para>Click “Yocto SDK”</para></listitem>
|
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</itemizedlist>
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</para>
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|
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<section id='configuring-the-cross-compiler-options'>
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<title>Configuring the Cross-Compiler Options</title>
|
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<para>
|
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Choose between ‘SDK Root Mode’ and ‘Poky Tree Mode’ for Cross
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Compiler Options.
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<itemizedlist>
|
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<listitem><para><emphasis>SDK Root Mode</emphasis> – Select this mode
|
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when you are not concerned with building an image or you do not have
|
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a Poky build tree on your system.
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For example, suppose you are an application developer and do not
|
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need to build an image.
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You just want to use an architecture-specific toolchain on an
|
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existing kernel and root filesystem.
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When you use SDK Root Mode you are using the toolchain installed
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in the <filename>/opt/poky</filename> directory.</para></listitem>
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<listitem><para><emphasis>Poky Tree Mode</emphasis> – Select this mode
|
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if you are concerned with building images for hardware or your
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development environment already has a build tree.
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In this case you likely already have a Poky build tree installed on
|
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your system or you (or someone else) will be building one.
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When you use the Poky Tree Mode you are using the toolchain bundled
|
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inside the Poky build tree.
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If you use this mode you must also supply the Poky Root Location
|
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in the Preferences Dialog.</para></listitem>
|
||||
</itemizedlist>
|
||||
</para>
|
||||
</section>
|
||||
|
||||
<section id='configuring-the-sysroot'>
|
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<title>Configuring the Sysroot</title>
|
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<para>
|
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Specify the sysroot, which is used by both the QEMU user-space
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NFS boot process and by the cross-toolchain regardless of the
|
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mode you select (SDK Root Mode or Poky Tree Mode).
|
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For example, sysroot is the location to which you extract the
|
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downloaded image’s root filesystem to through the ADT Installer.
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</para>
|
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</section>
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|
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<section id='selecting-the-target-architecture'>
|
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<title>Selecting the Target Architecture</title>
|
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<para>
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Use the pull-down Target Architecture menu and select the
|
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target architecture.
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</para>
|
||||
<para>
|
||||
The Target Architecture is the type of hardware you are
|
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going to use or emulate.
|
||||
This pull-down menu should have the supported architectures.
|
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If the architecture you need is not listed in the menu then you
|
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will need to re-visit
|
||||
<xref linkend='adt-prepare'>
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“Preparing to Use the Application Development Toolkit (ADT)”</xref>
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section earlier in this document.
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||||
</para>
|
||||
</section>
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|
||||
<section id='choosing-the-target-options'>
|
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<title>Choosing the Target Options</title>
|
||||
<para>
|
||||
You can choose to emulate hardware using the QEMU emulator, or you
|
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can choose to use actual hardware.
|
||||
<itemizedlist>
|
||||
<listitem><para><emphasis>External HW</emphasis> – Select this option
|
||||
if you will be using actual hardware.</para></listitem>
|
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<listitem><para><emphasis>QEMU</emphasis> – Select this option if
|
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you will be using the QEMU emulator.
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If you are using the emulator you also need to locate the Kernel
|
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and you can specify custom options.</para>
|
||||
<para>In Poky Tree Mode the kernel you built will be located in the
|
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Poky Build tree in <filename>tmp/deploy/images</filename> directory.
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In SDK Root Mode the pre-built kernel you downloaded is located
|
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in the directory you specified when you downloaded the image.</para>
|
||||
<para>Most custom options are for advanced QEMU users to further
|
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customize their QEMU instance.
|
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These options are specified between paired angled brackets.
|
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Some options must be specified outside the brackets.
|
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Use the <filename>man qemu</filename> command to get help on all the options.
|
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The following is an example custom:
|
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<literallayout class='monospaced'>
|
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serial ‘<-m 256 –full-screen>’
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</literallayout>
|
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</para>
|
||||
<para>
|
||||
Regardless of the mode, Sysroot is already defined in the “Sysroot”
|
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field.</para></listitem>
|
||||
</itemizedlist>
|
||||
</para>
|
||||
<para>
|
||||
Click the “OK” button to save your plug-in configurations.
|
||||
</para>
|
||||
</section>
|
||||
</section>
|
||||
</section>
|
||||
|
||||
<section id='creating-the-project'>
|
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<title>Creating the Project</title>
|
||||
<para>
|
||||
You can create two types of projects: Autotools-based, or Makefile-based.
|
||||
This section describes how to create autotools-based projects from within
|
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the Eclipse IDE.
|
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For information on creating projects in a terminal window see
|
||||
<xref linkend='using-the-command-line'> “Using the Command Line”</xref>
|
||||
section.
|
||||
</para>
|
||||
<para>
|
||||
To create a project based on a Yocto template and then display the source code,
|
||||
follow these steps:
|
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<orderedlist>
|
||||
<listitem><para>Select File -> New -> Project.</para></listitem>
|
||||
<listitem><para>Double click “CC++”.</para></listitem>
|
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<listitem><para>Double click “C Project” to create the project.</para></listitem>
|
||||
<listitem><para>Double click “Yocto SDK Project”.</para></listitem>
|
||||
<listitem><para>Select “Hello World ANSI C Autotools Project”.
|
||||
This is an Autotools-based project based on a Yocto Project template.</para></listitem>
|
||||
<listitem><para>Put a name in the “Project name:” field.</para></listitem>
|
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<listitem><para>Click “Next”.</para></listitem>
|
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<listitem><para>Add information in the “Author” field.</para></listitem>
|
||||
<listitem><para>Use “GNU General Public License v2.0” for the License.</para></listitem>
|
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<listitem><para>Click “Finish”.</para></listitem>
|
||||
<listitem><para>Answer ‘Yes” to the open perspective prompt.</para></listitem>
|
||||
<listitem><para>In the Project Explorer expand your project.</para></listitem>
|
||||
<listitem><para>Expand ‘src’.</para></listitem>
|
||||
<listitem><para>Double click on your source file and the code appears
|
||||
in the window.
|
||||
This is the template.</para></listitem>
|
||||
</orderedlist>
|
||||
</para>
|
||||
</section>
|
||||
|
||||
<section id='configuring-the-cross-toolchains'>
|
||||
<title>Configuring the Cross-Toolchains</title>
|
||||
<para>
|
||||
The previous section, <xref linkend='configuring-the-cross-compiler-options'>
|
||||
“Configuring the Cross-Compiler Options”</xref>, set up the default project
|
||||
configurations.
|
||||
You can change these settings for a given project by following these steps:
|
||||
<orderedlist>
|
||||
<listitem><para>Select Project -> Invoke Yocto Tools -> Reconfigure Yocto.
|
||||
This brings up the project Yocto Settings Dialog.
|
||||
Settings are inherited from the default project configuration.
|
||||
The information in this dialogue is identical to that chosen earlier
|
||||
for the Cross Compiler Option (SDK Root Mode or Poky Tree Mode),
|
||||
the Target Architecture, and the Target Options.
|
||||
The settings are inherited from the Yocto Plug-in configuration performed
|
||||
after installing the plug-in.</para></listitem>
|
||||
<listitem><para>Select Project -> Reconfigure Project.
|
||||
This runs the <filename>autogen.sh</filename> in the workspace for your project.
|
||||
The script runs <filename>libtoolize</filename>, <filename>aclocal</filename>,
|
||||
<filename>autoconf</filename>, <filename>autoheader</filename>,
|
||||
<filename>automake ‐‐a</filename>, and
|
||||
<filename>./configure</filename>.</para></listitem>
|
||||
</orderedlist>
|
||||
</para>
|
||||
</section>
|
||||
|
||||
<section id='building-the-project'>
|
||||
<title>Building the Project</title>
|
||||
<para>
|
||||
To build the project, select Project -> Build Project.
|
||||
You should see the console updated and you can note the cross-compiler you are using.
|
||||
</para>
|
||||
</section>
|
||||
|
||||
<section id='starting-qemu-in-user-space-nfs-mode'>
|
||||
<title>Starting QEMU in User Space NFS Mode</title>
|
||||
<para>
|
||||
To start the QEMU emulator from within Eclipse, follow these steps:
|
||||
<orderedlist>
|
||||
<listitem><para>Select Run -> External Tools -> External Tools Configurations...
|
||||
This selection brings up the External Tools Configurations Dialogue.</para></listitem>
|
||||
<listitem><para>Go to the left navigation area and expand ‘Program’.
|
||||
You should find the image listed.
|
||||
For example, qemu-x86_64-poky-linux.</para></listitem>
|
||||
<listitem><para>Click on the image.
|
||||
This brings up a new environment in the main area of the External
|
||||
Tools Configurations Dialogue.
|
||||
The Main tab is selected.</para></listitem>
|
||||
<listitem><para>Click “Run” next.
|
||||
This brings up a shell window.</para></listitem>
|
||||
<listitem><para>Enter your host root password in the shell window at the prompt.
|
||||
This sets up a Tap 0 connection needed for running in user-space NFS mode.</para></listitem>
|
||||
<listitem><para>Wait for QEMU to launch.</para></listitem>
|
||||
<listitem><para>Once QEMU launches you need to determine the IP Address
|
||||
for the user-space NFS.
|
||||
You can do that by going to a terminal in the QEMU and entering the
|
||||
<filename>ipconfig</filename> command.</para></listitem>
|
||||
</orderedlist>
|
||||
</para>
|
||||
</section>
|
||||
|
||||
<section id='deploying-and-debugging-the-application'>
|
||||
<title>Deploying and Debugging the Application</title>
|
||||
<para>
|
||||
Once QEMU is running you can deploy your application and use the emulator
|
||||
to perform debugging.
|
||||
Follow these steps to deploy the application.
|
||||
<orderedlist>
|
||||
<listitem><para>Select Run -> Debug Configurations...</para></listitem>
|
||||
<listitem><para>In the left area expand “C/C++Remote Application”.</para></listitem>
|
||||
<listitem><para>Locate your project and select it to bring up a new
|
||||
tabbed view in the Debug Configurations dialogue.</para></listitem>
|
||||
<listitem><para>Enter the absolute path into which you want to deploy
|
||||
the application.
|
||||
Use the Remote Absolute File Path for C/C++Application:.
|
||||
For example, enter <filename>/usr/bin/<programname></filename>.</para></listitem>
|
||||
<listitem><para>Click on the Debugger tab to see the cross-tool debugger
|
||||
you are using.</para></listitem>
|
||||
<listitem><para>Create a new connection to the QEMU instance
|
||||
by clicking on “new”.</para></listitem>
|
||||
<listitem><para>Select “TCF, which means Target Communication Framework.</para></listitem>
|
||||
<listitem><para>Click “Next”.</para></listitem>
|
||||
<listitem><para>Clear out the “host name” field and enter the IP Address
|
||||
determined earlier.</para></listitem>
|
||||
<listitem><para>Click Finish to close the new connections dialogue.</para></listitem>
|
||||
<listitem><para>Use the drop-down menu now in the “Connection” field and pick
|
||||
the IP Address you entered.</para></listitem>
|
||||
<listitem><para>Click “Debug” to bring up a login screen and login.</para></listitem>
|
||||
<listitem><para>Accept the debug perspective.</para></listitem>
|
||||
</orderedlist>
|
||||
</para>
|
||||
</section>
|
||||
|
||||
|
||||
<section id='running-user-space-tools'>
|
||||
<title>Running User-Space Tools</title>
|
||||
<para>
|
||||
As mentioned earlier in the manual several tools exist that enhance
|
||||
your development experience.
|
||||
These tools are aids in developing and debugging applications and images.
|
||||
You can run these user-space tools from within the Yocto Eclipse
|
||||
Plug-in through the Window -> YoctoTools menu.
|
||||
</para>
|
||||
<para>
|
||||
Once you pick a tool you need to configure it for the remote target.
|
||||
Every tool needs to have the connection configured.
|
||||
You must select an existing TCF-based RSE connection to the remote target.
|
||||
If one does not exist, click "New" to create one.
|
||||
</para>
|
||||
<para>
|
||||
Here are some specifics about the remote tools:
|
||||
<itemizedlist>
|
||||
<listitem><para><emphasis>OProfile:</emphasis> Selecting this tool causes
|
||||
the oprofile-server on the remote target to launch on the local host machine.
|
||||
The oprofile-viewer must be installed on the local host machine and the
|
||||
oprofile-server must be installed on the remote target, respectively, in order
|
||||
to use.
|
||||
You can locate both the viewer and server from
|
||||
<ulink url='http://git.pokylinux.org/cgit/cgit.cgi/oprofileui/'></ulink>.
|
||||
You need to compile and install the oprofile-viewer from the source code
|
||||
on your local host machine.
|
||||
The oprofile-server is installed by default in the image.</para></listitem>
|
||||
<listitem><para><emphasis>Lttng-ust:</emphasis> Selecting this tool runs
|
||||
"usttrace" on the remote target, transfers the output data back to the
|
||||
local host machine and uses "lttv-gui" to graphically display the output.
|
||||
The "lttv-gui" must be installed on the local host machine to use this tool.
|
||||
For information on how to use "lttng" to trace an application, see
|
||||
<ulink url='http://lttng.org/files/ust/manual/ust.html'></ulink>.</para>
|
||||
<para>For "Application" you must supply the absolute path name of the
|
||||
application to be traced by user mode lttng.
|
||||
For example, typing <filename>/path/to/foo</filename> triggers
|
||||
<filename>usttrace /path/to/foo</filename> on the remote target to trace the
|
||||
program <filename>/path/to/foo</filename>.</para>
|
||||
<para>"Argument" is passed to <filename>usttrace</filename>
|
||||
running on the remote target.</para></listitem>
|
||||
<listitem><para><emphasis>PowerTOP:</emphasis> Selecting this tool runs
|
||||
"PowerTOP" on the remote target machine and displays the results in a
|
||||
new view called "powertop".</para>
|
||||
<para>"Time to gather data(sec):" is the time passed in seconds before data
|
||||
is gathered from the remote target for analysis.</para>
|
||||
<para>"show pids in wakeups list:" corresponds to the -p argument
|
||||
passed to "powertop".</para></listitem>
|
||||
<listitem><para><emphasis>LatencyTOP and Perf:</emphasis> "LatencyTOP"
|
||||
identifies system latency, while "perf" monitors the system's
|
||||
performance counter registers.
|
||||
Selecting either of these tools causes an RSE terminal view to appear
|
||||
from which you can run the tools.
|
||||
Both tools refresh the entire screen to display results while they run.</para></listitem>
|
||||
</itemizedlist>
|
||||
</para>
|
||||
</section>
|
||||
|
||||
</chapter>
|
||||
<!--
|
||||
|
|
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Reference in New Issue