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documentation/kernel-manual/kernel-concepts.xml: new section starting

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This is the start of a new section on configuration.  It is mostly
writer's notes at this point.  More to be added later.

(From yocto-docs rev: db41de4ebd7040f507c5a43739f1a25d7e1d9623)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Scott Rifenbark
2012-01-26 17:08:17 -06:00
committed by Richard Purdie
parent 4baaf11e40
commit 8f9dc14e28
1 changed files with 70 additions and 0 deletions
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documentation/kernel-manual/kernel-concepts.xml
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@@ -303,6 +303,76 @@
</section>
</section>
<section id='kernel-configuration'>
<title>Kernel Configuration</title>
<para>
Kernel configuration, along with kernel features, defines how a kernel image is
built.
Through configuration settings, you can customize a Linux Yocto kernel to be
specific to particular hardware.
For example, you can specify sound support or networking support.
This section describes basic concepts behind Kernel configuration within the
Yocto Project.
</para>
<para>
WRITER NOTES:
</para>
<para>
Explain how <filename>.config</filename> is used when the kernel image is built.
Describe the role of <filename>menuconfig</filename> regarding the
<filename>.config</filename>.
Locate the <filename>.config</filename> for the user.
Not recommended to edit the <filename>.config</filename> file directly.
You can use BitBake to build and invoke the <filename>menuconfig</filename>
tool.
</para>
<para>
Introduce the configuration fragment.
Step through the life of a configuration fragment from idea or need to
change something in the kernel to how it is used when the kernel image is built.
Describe how configuration fragments are created and where they live.
Make sure the syntax of configuration fragments is understood.
</para>
<para>
Talk in general how the user creates a configuration fragment.
Point to example B.2 of the YP Development Manual as a way to use
<filename>menuconfig</filename>.
</para>
<para>
The tool <filename>menuconfig</filename> allows you to choose the features of the
Linux Yocto kernel that will be compiled.
This tool is a convenient method to alter the <filename>.config</filename> file.
You can use a simple interface to scroll through kernel features and disable
and enable configruation variables.
When you save your changes, the contents of the <filename>.config</filename>
are altered.
You can get general information on <filename>menuconfig</filename> at
<ulink url='http://en.wikipedia.org/wiki/Menuconfig'></ulink>.
</para>
<para>
The Yocto Project employs <filename>menuconfig</filename> by invoking it through
BitBake as follows after making sure the environment setup script has been sourced:
<literallayout class='monospaced'>
$ bitbake linux-yocto -c menuconfig
</literallayout>
You can see how <filename>menuconfig</filename> is used to change a simple
kernel configuration in the
"<ulink url='http://www.yoctoproject.org/docs/latest/dev-manual/dev-manual.html#changing-the-config-smp-configuration-using-menuconfig'>Changing the&nbsp;&nbsp;<filename>CONFIG_SMP</filename>
Configuration Using&nbsp;&nbsp;<filename>menuconfig</filename></ulink>" section of
The Yocto Project Development Manual.
</para>
<para>
END WRITER NOTES
</para>
</section>
<section id='kernel-tools'>
<title>Kernel Tools</title>
<para>