documentation: dev-manual - edits to the patching the kernel and model sections.
Made changes to try and clean up the process. (From yocto-docs rev: 9c4fbcb473dc594647ba8779162379a745f8f8d6) Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Scott Rifenbark
Richard Purdie
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commit
715456acb8
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@ -1623,7 +1623,15 @@
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<filename>calibrate.c</filename> source code file.
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Applying the patch and booting the modified image causes the added
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messages to appear on the emulator's console.
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</para>
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</para>
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<para>
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The example assumes a clean build exists for the <filename>x86qemu</filename>
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machine in a Source Directory named <filename>poky</filename>.
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Furthermore, the <link linkend='build-directory'>Build Directory</link> is
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<filename>build</filename> and is located in <filename>poky</filename> and
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the kernel is based on the Linux 3.4 kernel.
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</para>
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<section id='create-a-layer-for-your-changes'>
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<title>Create a Layer for your Changes</title>
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@ -1635,7 +1643,7 @@
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$mkdir meta-mylayer
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</literallayout>
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Creating a directory that follows the Yocto Project layer naming
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conventions sets up the area for your layer.
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conventions sets up the area for your changes.
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The layer is where you place your configuration files, append
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files, and patch files.
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To learn more about creating a layer and filling it with the
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@ -1658,20 +1666,18 @@
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<literallayout class='monospaced'>
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${TMPDIR}/work/${MACHINE}-poky-${TARGET_OS}/${PN}-${PV}-${PR}
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</literallayout>
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Assuming a recent build for the <filename>qemux86</filename> machine
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based on the Linux 3.4 kernel, a
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<link linkend='source-directory'>Source Directory</link> named <filename>poky</filename>, and
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the existence of a default <filename>build</filename> directory, the directory that
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holds the temporary source code would be here:
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For this example, the directory that
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holds the temporary source code is here:
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<literallayout class='monospaced'>
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~/poky/build/tmp/work/qemux86-poky-linux/linux-yocto-3.4.11+git1+5bdc...85f-r4.3
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</literallayout>
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Within the <filename>linux</filename> directory, you find the source directories.
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Within the <filename>linux</filename> directory, you find directories for
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the source.
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</para>
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<para>
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For this example, we are going to patch the <filename>init/calibrate.c</filename> file
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and add some simple console <filename>printk</filename> statements that we can
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by adding some simple console <filename>printk</filename> statements that we can
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see when we boot the image using QEMU.
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</para>
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</section>
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@ -1686,11 +1692,11 @@
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</para>
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<para>
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To create the patch for the <filename>calibrate.c</filename>, follow the steps
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outlined in the
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To create the patch for the <filename>calibrate.c</filename>, follow steps
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3 through 12 outlined in the
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"<link linkend='using-a-git-workflow'>Using a Git Workflow</link>"
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section.
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For the steps used to edit the source file, do the following:
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For step 6 (Edit the Files), do the following:
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</para>
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<para>
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@ -1737,16 +1743,30 @@
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<title>Get Your Layer Setup for the Build</title>
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<para>
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At this point, you have a patch file in the same directory as your original
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<filename>calibrate.c</filename>.
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Move it to your layer and place it in a separate folder having the same
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name as the recipe, which is <filename>linux-yocto</filename> in this case.
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At this point, you have a patch file in the kernel's source code directory.
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The patch file is named according to the commit's summary line and ends
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with <filename>.patch</filename>.
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For this example, it is named <filename>0001-calibrate.c.patch</filename>.
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</para>
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<para>
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Next, you need to set up your <filename>conf</filename> directory in your layer.
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Create the <filename>conf</filename> and create the <filename>layer.conf</filename>
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file.
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You need to move the patch file to your layer next.
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The patch file needs to reside in the
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<filename>meta-mylayer/recipes-kernel/linux/linux-yocto</filename> directory.
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Create this directory path within your layer and move the patch file.
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This directory path mirrors that used by the main kernel recipe in
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the Source Directory (<filename>poky</filename>).
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<literallayout class='monospaced'>
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$ cd ~/poky/meta-mylayer
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$ mkdir recipes-kernel
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$ mkdir recipes-kernel/linux
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$ mkdir recipes-kernel/linux/linux-yocto
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</literallayout>
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</para>
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<para>
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Next, you need to create a <filename>conf</filename> directory in your layer
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and within it create the <filename>layer.conf</filename> file.
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You can find information on this in the
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"<link linkend='creating-your-own-layer'>Creating Your Own Layer</link>"
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section.
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@ -1807,12 +1827,14 @@
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/home/scottrif/poky/meta-mylayer \
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"
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</literallayout></para></listitem>
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<listitem><para><emphasis>Create a bbappend File:</emphasis> You need to have
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an append file to the main 3.4 kernel recipe.
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Locate the append file in your <filename>meta-mylayer</filename> layer.
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It needs to be in a <filename>meta-mylayer/recipes-kernel/linux</filename> directory.
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Create the directory and use the following for the append file.
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This example assumes patch file is named <filename>0001-documentation-calibrate.c.patch</filename>:
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<listitem><para><emphasis>Create a bbappend File:</emphasis> You need to create
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an append file for the main 3.4 kernel recipe.
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Create the append file in the <filename>linux</filename> directory you
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created earlier within your layer.
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Assuming the patch file is named
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<filename>0001-documentation-calibrate.c.patch</filename>, your append
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file, which must be named <filename>linux-yocto_3.4.bbappend</filename>,
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has these statements:
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<literallayout class='monospaced'>
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FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
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@ -1730,6 +1730,11 @@ directory.</para></listitem>
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"<ulink url='&YOCTO_DOCS_QS_URL;#building-image'>Building an Image</ulink>"
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section of the Yocto Project Quick Start.
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</note></para></listitem>
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<listitem><para><emphasis>Change Your Working Directory:</emphasis>
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After making your edits, move back to the directory from which you
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initialized the Git repository.
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Returning to this directory ensures you are using the correct branch when
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you go to commit your changes.</para></listitem>
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<listitem><para><emphasis>See the List of Files You Changed:</emphasis>
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Use the <filename>git status</filename> command to see what files you have actually edited.
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The ability to have Git track the files you have changed is an advantage that this
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