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kernel-dev: New step to "Generating Configuration Files" section. 

Add a new step about how to use diffconfig task to create
kernel config fragments.

Scott fixed some grammar in one of the sentences after applying the
patch.

(From yocto-docs rev: 5b7ccdbf708cbeebc2d8dc91db129fb35aabdcdd)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
João Henrique Ferreira de Freitas 2014-03-10 18:07:51 -06:00 committed by Richard Purdie
parent a41113c94f
commit 2f643ad571
1 changed files with 9 additions and 16 deletions
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25
documentation/kernel-dev/kernel-dev-common.xml
View File

@ -342,32 +342,25 @@
<literallayout class='monospaced'>
$ bitbake linux-yocto -c kernel_configme -f
</literallayout></para></listitem>
<listitem><para>Copy and rename the resulting
<filename>.config</filename> file (e.g.
<filename>config.orig</filename>).
</para></listitem>
<listitem><para>Run the <filename>menuconfig</filename>
command:
<literallayout class='monospaced'>
$ bitbake linux-yocto -c menuconfig
</literallayout></para></listitem>
<listitem><para>Prepare a configuration fragment based on
the differences between the two files.
</para></listitem>
<listitem><para>Run the <filename>diffconfig</filename>
command to prepare a configuration fragment.
The resulting file <filename>fragment.cfg</filename>
will be placed in the
<filename>${</filename><ulink url='&YOCTO_DOCS_REF_URL;#var-WORKDIR'><filename>WORKDIR</filename></ulink><filename>}</filename> directory:
<literallayout class='monospaced'>
$ bitbake linux-yocto -c diffconfig
</literallayout></para></listitem>
</orderedlist>
</para>
<para>
Ultimately, the configuration fragment file needs to be a
The <filename>diffconfig</filename> command creates a file that is a
list of Linux kernel <filename>CONFIG_</filename> assignments.
It cannot be in <filename>diff</filename> format.
Here is an example of a command that creates your
configuration fragment file.
Regardless of the exact command you use, plan on reviewing
the output as you can usually remove some of the defaults:
<literallayout class='monospaced'>
$ diff -Nurp config.orig .config | sed -n "s/^\+//p" > frag.cfg
</literallayout>
See the "<link linkend='changing-the-configuration'>Changing the Configuration</link>"
section for information on how to use the output as a
configuration fragment.