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kernel-dev: Edits to the "Changing the Configuration" section. 

This section had some problems.  It failed to mention the
need to extend FILESPATH by using FILESEXTRAPATHS.

(From yocto-docs rev: e627cf21242a62fb23e93fdae61e8cfce32082a9)

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 2013-04-17 11:38:09 -07:00 committed by Richard Purdie
parent 4bb60daf5a
commit a3d2886a47
1 changed files with 19 additions and 7 deletions
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26
documentation/kernel-dev/kernel-dev-common.xml
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@ -149,20 +149,31 @@
You can make wholesale or incremental changes to the Linux You can make wholesale or incremental changes to the Linux
kernel <filename>.config</filename> file by including a kernel <filename>.config</filename> file by including a
<filename>defconfig</filename> or by specifying <filename>defconfig</filename> or by specifying
configuration fragments in the <filename>SRC_URI</filename>. configuration fragments in the
<ulink url='&YOCTO_DOCS_REF_URL;#var-SRC_URI'><filename>SRC_URI</filename></ulink>.
</para> </para>
<para> <para>
If you have a complete Linux kernel <filename>.config</filename> If you have a complete Linux kernel <filename>.config</filename>
file you want to use, copy it to a directory named file you want to use, copy it to a directory named
<filename>files</filename>, which is in your <filename>files</filename>, which must be in
layer's <filename>recipes-kernel/linux</filename> directory your layer's <filename>recipes-kernel/linux</filename>
and name name the file "defconfig". directory, and name the file "defconfig".
Then, add the following line to your linux-yocto Then, add the following lines to your linux-yocto
<filename>.bbappend</filename> file in your layer: <filename>.bbappend</filename> file in your layer:
<literallayout class='monospaced'> <literallayout class='monospaced'>
FILESEXTRAPATHS_prepend := "${THISDIR}/files:"
SRC_URI += "file://defconfig" SRC_URI += "file://defconfig"
</literallayout> </literallayout>
The
<filename>SRC_URI</filename> tells the build system how to
search for the file, while the
<ulink url='&YOCTO_DOCS_REF_URL;#var-FILESEXTRAPATHS'><filename>FILESEXTRAPATHS</filename></ulink>
extends the
<ulink url='&YOCTO_DOCS_REF_URL;#var-FILESPATH'><filename>FILESPATH</filename></ulink>
variable (search directories) to include the
<filename>files</filename> directory you created for the
configuration changes.
</para> </para>
<para> <para>
@ -182,10 +193,11 @@
CONFIG_SERIAL_CORE=y CONFIG_SERIAL_CORE=y
CONFIG_SERIAL_CORE_CONSOLE=y CONFIG_SERIAL_CORE_CONSOLE=y
</literallayout> </literallayout>
Next, include this configuration fragment in a Next, include this configuration fragment and extend the
<filename>SRC_URI</filename> statement in your <filename>FILESPATH</filename> variable in your
<filename>.bbappend</filename> file: <filename>.bbappend</filename> file:
<literallayout class='monospaced'> <literallayout class='monospaced'>
FILESEXTRAPATHS_prepend := "${THISDIR}/files:"
SRC_URI += "file://8250.cfg" SRC_URI += "file://8250.cfg"
</literallayout> </literallayout>
The next time you run BitBake to build the Linux kernel, BitBake The next time you run BitBake to build the Linux kernel, BitBake