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bsp-guide: Minor introduction rewrite and formatting BSP workflow.
(From yocto-docs rev: 697d8ce39a122a33faebf1ab66b6bb16bfab5986) Signed-off-by: Scott Rifenbark <srifenbark@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Scott Rifenbark
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Richard Purdie
Richard Purdie
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@@ -714,34 +714,25 @@
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<title>Developing a Board Support Package (BSP)</title>
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<para>
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A BSP is a collection of recipes that, when applied during a build, results in
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an image that you can run on a particular board.
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Thus, the package when compiled into the new image, supports the operation of the board.
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</para>
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<note>
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For a brief list of terms used when describing the development process in the Yocto Project,
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see the
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"<ulink url='&YOCTO_DOCS_REF_URL;#yocto-project-terms'>Yocto Project Terms</ulink>" section.
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</note>
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<para>
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The remainder of this section presents the basic
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steps used to create a BSP using the Yocto Project's
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This section contains the high-level procedure you can follow
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to create a BSP using the Yocto Project's
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<link linkend='using-the-yocto-projects-bsp-tools'>BSP Tools</link>.
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Although not required for BSP creation, the
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<filename>meta-intel</filename> repository, which contains
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many BSPs supported by the Yocto Project, is part of the example.
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many BSPs supported by the Yocto Project, is part of the
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example.
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</para>
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<para>
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For an example that shows how to create a new layer using the tools, see the
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For an example that shows how to create a new layer using
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the tools, see the
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"<link linkend='creating-a-new-bsp-layer-using-the-yocto-bsp-script'>Creating a New BSP Layer Using the yocto-bsp Script</link>"
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section.
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</para>
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<para>
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The following illustration and list summarize the BSP creation general workflow.
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The following illustration and list summarize the BSP
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creation general workflow.
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</para>
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<para>
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@@ -750,149 +741,185 @@
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<para>
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<orderedlist>
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<listitem><para><emphasis>Set up your host development system to support
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development using the Yocto Project</emphasis>: See the
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<listitem><para>
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<emphasis>Set Up Your Host Development System to Support
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Development Using the Yocto Project:</emphasis>
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See the
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"<ulink url='&YOCTO_DOCS_QS_URL;#the-linux-distro'>The Linux Distribution</ulink>"
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and the
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"<ulink url='&YOCTO_DOCS_QS_URL;#packages'>The Build Host Packages</ulink>" sections both
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in the Yocto Project Quick Start for requirements.</para></listitem>
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<listitem><para><emphasis>Establish a local copy of the project files on your
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system</emphasis>: You need this
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"<ulink url='&YOCTO_DOCS_QS_URL;#packages'>The Build Host Packages</ulink>"
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sections both in the Yocto Project Quick Start for
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build host requirements.
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</para></listitem>
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<listitem><para>
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<emphasis>Establish a Local Copy of the Project Files on
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Your System:</emphasis>
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You need this
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<ulink url='&YOCTO_DOCS_REF_URL;#source-directory'>Source Directory</ulink>
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available on your host system.
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Having these files on your system gives you access to the build
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process and to the tools you need.
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Having these files on your system gives you access to the
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build process and to the tools you need.
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For information on how to set up the Source Directory,
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see the
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"<ulink url='&YOCTO_DOCS_DEV_URL;#working-with-yocto-project-source-files'>Working With Yocto Project Source Files</ulink>"
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section in the Yocto Project Development Manual.
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</para></listitem>
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<listitem><para><emphasis>Establish the <filename>meta-intel</filename>
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repository on your system</emphasis>: Having local copies
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of these supported BSP layers on your system gives you
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access to layers you might be able to build on or modify
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to create your BSP.
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<listitem><para>
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<emphasis>Establish the <filename>meta-intel</filename>
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Repository on Your System:</emphasis>
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Having local copies of these supported BSP layers on
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your system gives you access to layers you might be able
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to build on or modify to create your BSP.
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For information on how to get these files, see the
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"<ulink url='&YOCTO_DOCS_DEV_URL;#setting-up-bsp-layers'>Setting Up BSP Layers</ulink>"
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section in the Yocto Project Development Manual.
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</para></listitem>
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<listitem><para><emphasis>Create your own BSP layer using the
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<link linkend='creating-a-new-bsp-layer-using-the-yocto-bsp-script'><filename>yocto-bsp</filename></link> script</emphasis>:
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Layers are ideal for
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isolating and storing work for a given piece of hardware.
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A layer is really just a location or area in which you place
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the recipes and configurations for your BSP.
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<listitem><para>
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<emphasis>Create Your Own BSP Layer Using the
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<link linkend='creating-a-new-bsp-layer-using-the-yocto-bsp-script'><filename>yocto-bsp</filename></link>
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script:</emphasis>
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Layers are ideal for isolating and storing work for a
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given piece of hardware.
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A layer is really just a location or area in which you
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place the recipes and configurations for your BSP.
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In fact, a BSP is, in itself, a special type of layer.
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The simplest way to create a new BSP layer that is compliant with the
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Yocto Project is to use the <filename>yocto-bsp</filename> script.
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The simplest way to create a new BSP layer that is
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compliant with the Yocto Project is to use the
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<filename>yocto-bsp</filename> script.
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For information about that script, see the
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"<link linkend='creating-a-new-bsp-layer-using-the-yocto-bsp-script'>Creating a New BSP Layer Using the yocto-bsp Script</link>"
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section.</para>
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<para>Another example that illustrates a layer
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is an application.
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Suppose you are creating an application that has
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library or other dependencies in order for it to
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compile and run.
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The layer, in this case, would be where all the
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recipes that define those dependencies are kept.
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The key point for a layer is that it is an isolated
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area that contains all the relevant information for
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the project that the OpenEmbedded build system knows
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about.
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For more information on layers, see the
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"<ulink url='&YOCTO_DOCS_DEV_URL;#understanding-and-creating-layers'>Understanding and Creating Layers</ulink>"
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section in the Yocto Project Development Manual.
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For more information on BSP layers, see the
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"<link linkend='bsp-layers'>BSP Layers</link>"
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section.
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</para>
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<note><title>Notes</title>
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<para>Five BSPs exist that are part of the Yocto
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Project release:
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<filename>beaglebone</filename> (ARM),
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<filename>mpc8315e</filename> (PowerPC),
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and <filename>edgerouter</filename> (MIPS).
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The recipes and configurations for these five BSPs
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are located and dispersed within the
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<ulink url='&YOCTO_DOCS_REF_URL;#source-directory'>Source Directory</ulink>.
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</para>
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<para>
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Another example that illustrates a layer
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is an application.
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Suppose you are creating an application that has
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library or other dependencies in order for it to
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compile and run.
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The layer, in this case, would be where all the
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recipes that define those dependencies are kept.
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The key point for a layer is that it is an isolated
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area that contains all the relevant information for
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the project that the OpenEmbedded build system knows
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about.
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For more information on layers, see the
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"<ulink url='&YOCTO_DOCS_DEV_URL;#understanding-and-creating-layers'>Understanding and Creating Layers</ulink>"
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section in the Yocto Project Development Manual.
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For more information on BSP layers, see the
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"<link linkend='bsp-layers'>BSP Layers</link>"
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section.
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<note>
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<para>
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Five BSPs exist that are part of the Yocto Project release:
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<filename>beaglebone</filename> (ARM),
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<filename>mpc8315e</filename> (PowerPC),
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and <filename>edgerouter</filename> (MIPS).
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The recipes and configurations for these five BSPs
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are located and dispersed within the
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<ulink url='&YOCTO_DOCS_REF_URL;#source-directory'>Source Directory</ulink>.
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</para>
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<para>Three core Intel BSPs exist as part of the Yocto
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Project release in the
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<filename>meta-intel</filename> layer:
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<itemizedlist>
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<listitem><para>
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<filename>intel-core2-32</filename>,
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which is a BSP optimized for the Core2 family of CPUs
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as well as all CPUs prior to the Silvermont core.
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</para></listitem>
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<listitem><para>
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<filename>intel-corei7-64</filename>,
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which is a BSP optimized for Nehalem and later
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Core and Xeon CPUs as well as Silvermont and later
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Atom CPUs, such as the Baytrail SoCs.
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</para></listitem>
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<listitem><para>
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<filename>intel-quark</filename>,
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which is a BSP optimized for the Intel Galileo
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gen1 & gen2 development boards.
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</para></listitem>
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</itemizedlist></para>
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</note></para>
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<para>
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Three core Intel BSPs exist as part of the Yocto
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Project release in the
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<filename>meta-intel</filename> layer:
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<itemizedlist>
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<listitem><para><filename>intel-core2-32</filename>,
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which is a BSP optimized for the Core2 family of CPUs
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as well as all CPUs prior to the Silvermont core.
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</para></listitem>
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<listitem><para><filename>intel-corei7-64</filename>,
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which is a BSP optimized for Nehalem and later
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Core and Xeon CPUs as well as Silvermont and later
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Atom CPUs, such as the Baytrail SoCs.
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</para></listitem>
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<listitem><para><filename>intel-quark</filename>,
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which is a BSP optimized for the Intel Galileo
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gen1 & gen2 development boards.
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</para></listitem>
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</itemizedlist>
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</para>
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</note>
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</para>
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<para>When you set up a layer for a new BSP, you should follow a standard layout.
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<para>When you set up a layer for a new BSP, you should
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follow a standard layout.
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This layout is described in the
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"<link linkend='bsp-filelayout'>Example Filesystem Layout</link>"
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section.
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In the standard layout, you will notice a suggested structure for recipes and
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configuration information.
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In the standard layout, you will notice a suggested
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structure for recipes and configuration information.
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You can see the standard layout for a BSP by examining
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any supported BSP found in the <filename>meta-intel</filename> layer inside
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the Source Directory.</para></listitem>
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<listitem><para><emphasis>Make configuration changes to your new BSP
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layer</emphasis>: The standard BSP layer structure organizes the files you need
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to edit in <filename>conf</filename> and several <filename>recipes-*</filename>
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any supported BSP found in the
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<filename>meta-intel</filename> layer inside the Source
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Directory.
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</para></listitem>
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<listitem><para>
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<emphasis>Make Configuration Changes to Your New BSP
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Layer:</emphasis>
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The standard BSP layer structure organizes the files
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you need to edit in <filename>conf</filename> and
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several <filename>recipes-*</filename>
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directories within the BSP layer.
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Configuration changes identify where your new layer is on the local system
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and identify which kernel you are going to use.
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When you run the <filename>yocto-bsp</filename> script, you are able to interactively
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configure many things for the BSP (e.g. keyboard, touchscreen, and so forth).
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Configuration changes identify where your new layer
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is on the local system and identify which kernel you
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are going to use.
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When you run the <filename>yocto-bsp</filename> script,
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you are able to interactively configure many things for
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the BSP (e.g. keyboard, touchscreen, and so forth).
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</para></listitem>
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<listitem><para><emphasis>Make recipe changes to your new BSP layer</emphasis>: Recipe
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changes include altering recipes (<filename>.bb</filename> files), removing
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recipes you do not use, and adding new recipes or append files
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(<filename>.bbappend</filename>) that you need to support your hardware.
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<listitem><para>
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<emphasis>Make Recipe Changes to Your New BSP
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Layer:</emphasis>
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Recipe changes include altering recipes
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(<filename>.bb</filename> files), removing recipes you
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do not use, and adding new recipes or append files
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(<filename>.bbappend</filename>) that you need to
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support your hardware.
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</para></listitem>
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<listitem><para><emphasis>Prepare for the build</emphasis>: Once you have made all the
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changes to your BSP layer, there remains a few things
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you need to do for the OpenEmbedded build system in order for it to create your image.
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You need to get the build environment ready by sourcing an environment setup script
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<listitem><para>
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<emphasis>Prepare for the Build:</emphasis>
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Once you have made all the changes to your BSP layer,
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there remains a few things you need to do for the
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OpenEmbedded build system in order for it to create
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your image.
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You need to get the build environment ready by
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sourcing an environment setup script
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(i.e. <filename>oe-init-build-env</filename> or
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<filename>oe-init-build-env-memres</filename>)
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and you need to be sure two key configuration files are configured appropriately:
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the <filename>conf/local.conf</filename> and the
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and you need to be sure two key configuration
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files are configured appropriately: the
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<filename>conf/local.conf</filename> and the
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<filename>conf/bblayers.conf</filename> file.
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You must make the OpenEmbedded build system aware of your new layer.
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You must make the OpenEmbedded build system aware
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of your new layer.
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See the
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"<ulink url='&YOCTO_DOCS_DEV_URL;#enabling-your-layer'>Enabling Your Layer</ulink>"
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section in the Yocto Project Development Manual
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for information on how to let the build system know about your new layer.</para>
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<para>The entire process for building an image is overviewed in the section
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for information on how to let the build system
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know about your new layer.</para>
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<para>The entire process for building an image is
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overviewed in the section
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"<ulink url='&YOCTO_DOCS_QS_URL;#qs-building-images'>Building Images</ulink>" section
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of the Yocto Project Quick Start.
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You might want to reference this information.</para></listitem>
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<listitem><para><emphasis>Build the image</emphasis>: The OpenEmbedded build system
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uses the BitBake tool to build images based on the type of image you want to create.
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You might want to reference this information.
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</para></listitem>
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<listitem><para>
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<emphasis>Build the Image:</emphasis>
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The OpenEmbedded build system uses the BitBake tool
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to build images based on the type of image you want to
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create.
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You can find more information about BitBake in the
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<ulink url='&YOCTO_DOCS_BB_URL;'>BitBake User Manual</ulink>.
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</para>
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<para>The build process supports several types of images to satisfy different needs.
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<para>The build process supports several types of
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images to satisfy different needs.
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See the
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"<ulink url='&YOCTO_DOCS_REF_URL;#ref-images'>Images</ulink>" chapter
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in the Yocto Project Reference Manual for information on
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supported images.</para></listitem>
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"<ulink url='&YOCTO_DOCS_REF_URL;#ref-images'>Images</ulink>"
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chapter in the Yocto Project Reference Manual for
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information on supported images.
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</para></listitem>
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</orderedlist>
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</para>
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</section>
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Reference in New Issue
Block a user