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kernel-dev: Clarify a couple minor things in kernel manual, ch 2.

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Some small changes to clarify how to change the configuration.

(From yocto-docs rev: fce7c97abb69f15142dbadf90a90965a49ec3e0e)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Robert P. J. Day
2015-03-02 08:27:29 -08:00
committed by Richard Purdie
parent bef8558f0e
commit b49a5ccc5b
1 changed files with 16 additions and 12 deletions
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28
documentation/kernel-dev/kernel-dev-common.xml
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@@ -156,23 +156,27 @@
<title>Changing the Configuration</title> <title>Changing the Configuration</title>
<para> <para>
You can make wholesale or incremental changes to the Linux You can make wholesale or incremental changes to the final
kernel <filename>.config</filename> file by including a <filename>.config</filename> file used for the eventual
<filename>defconfig</filename> and by specifying Linux kernel configuration by including a
<filename>defconfig</filename> file and by specifying
configuration fragments in the configuration fragments in the
<ulink url='&YOCTO_DOCS_REF_URL;#var-SRC_URI'><filename>SRC_URI</filename></ulink>. <ulink url='&YOCTO_DOCS_REF_URL;#var-SRC_URI'><filename>SRC_URI</filename></ulink>
to be applied to that file.
</para> </para>
<para> <para>
If you have a final Linux kernel <filename>.config</filename> If you have a complete, working Linux kernel
file you want to use, copy it to a directory named <filename>.config</filename>
<filename>files</filename>, which must be in file you want to use for the configuration, as before, copy
your layer's <filename>recipes-kernel/linux</filename> that file to the appropriate <filename>${PN}</filename>
directory, and name the file "defconfig". directory in your layer's
Then, add the following lines to your linux-yocto <filename>recipes-kernel/linux</filename> directory,
and rename the copied file to "defconfig".
Then, add the following lines to the linux-yocto
<filename>.bbappend</filename> file in your layer: <filename>.bbappend</filename> file in your layer:
<literallayout class='monospaced'> <literallayout class='monospaced'>
FILESEXTRAPATHS_prepend := "${THISDIR}/files:" FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
SRC_URI += "file://defconfig" SRC_URI += "file://defconfig"
</literallayout> </literallayout>
The <filename>SRC_URI</filename> tells the build system how to The <filename>SRC_URI</filename> tells the build system how to
@@ -181,7 +185,7 @@
extends the extends the
<ulink url='&YOCTO_DOCS_REF_URL;#var-FILESPATH'><filename>FILESPATH</filename></ulink> <ulink url='&YOCTO_DOCS_REF_URL;#var-FILESPATH'><filename>FILESPATH</filename></ulink>
variable (search directories) to include the variable (search directories) to include the
<filename>files</filename> directory you created for the <filename>${PN}</filename> directory you created to hold the
configuration changes. configuration changes.
</para> </para>