kernel-dev: Clarify a couple minor things in kernel manual, ch 2.
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>
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@ -156,23 +156,27 @@
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<title>Changing the Configuration</title>
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<para>
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You can make wholesale or incremental changes to the Linux
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kernel <filename>.config</filename> file by including a
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<filename>defconfig</filename> and by specifying
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You can make wholesale or incremental changes to the final
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<filename>.config</filename> file used for the eventual
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Linux kernel configuration by including a
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<filename>defconfig</filename> file and by specifying
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configuration fragments in the
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<ulink url='&YOCTO_DOCS_REF_URL;#var-SRC_URI'><filename>SRC_URI</filename></ulink>.
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<ulink url='&YOCTO_DOCS_REF_URL;#var-SRC_URI'><filename>SRC_URI</filename></ulink>
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to be applied to that file.
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</para>
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<para>
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If you have a final Linux kernel <filename>.config</filename>
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file you want to use, copy it to a directory named
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<filename>files</filename>, which must be in
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your layer's <filename>recipes-kernel/linux</filename>
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directory, and name the file "defconfig".
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Then, add the following lines to your linux-yocto
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If you have a complete, working Linux kernel
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<filename>.config</filename>
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file you want to use for the configuration, as before, copy
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that file to the appropriate <filename>${PN}</filename>
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directory in your layer's
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<filename>recipes-kernel/linux</filename> directory,
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and rename the copied file to "defconfig".
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Then, add the following lines to the linux-yocto
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<filename>.bbappend</filename> file in your layer:
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<literallayout class='monospaced'>
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FILESEXTRAPATHS_prepend := "${THISDIR}/files:"
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FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
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SRC_URI += "file://defconfig"
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</literallayout>
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The <filename>SRC_URI</filename> tells the build system how to
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@ -181,7 +185,7 @@
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extends the
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<ulink url='&YOCTO_DOCS_REF_URL;#var-FILESPATH'><filename>FILESPATH</filename></ulink>
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variable (search directories) to include the
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<filename>files</filename> directory you created for the
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<filename>${PN}</filename> directory you created to hold the
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configuration changes.
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</para>
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