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kernel-dev: Updates on how to prepare for kernel modification.

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WIP at this point.

(From yocto-docs rev: 12e44f6ee7f9437d85c33d0789dbafe937af5664)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Scott Rifenbark
2017-08-18 18:22:20 -07:00
committed by Richard Purdie
parent 5865fcdf85
commit 0fbba0fb46
2 changed files with 71 additions and 1 deletions
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26
documentation/kernel-dev/kernel-dev-common.xml
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@@ -452,6 +452,32 @@
<section id="using-devtool-to-patch-the-kernel">
<title>Using <filename>devtool</filename> to Patch the Kernel</title>
<para role='writernotes'>
Some stuff here for the using devtool from the wiki.
This whole section is WIP.
<orderedlist>
<listitem><para role='writernotes'>
If you are dealing with real hardware, you can flash the
new kernel image to a USB stick and boot the hardware to
see it run.
</para></listitem>
<listitem><para role='writernotes'>
Checkout and modify the kernel source.
This is where you make your changes to the image.
</para></listitem>
<listitem><para role='writernotes'>
Create a new image that uses the altered kernel.
</para></listitem>
<listitem><para role='writernotes'>
If you are working with actual hardware, you can flash
the new image to a USB stick and use it to boot up the
hardware.
You can see your changes in action.
</para></listitem>
</orderedlist>
</para>
<para>
Patching the kernel involves changing or adding configurations to an existing kernel,
changing or adding recipes to the kernel that are needed to support specific hardware features,

46
documentation/kernel-dev/kernel-dev-intro.xml
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@@ -121,7 +121,51 @@
<title>Getting Ready to Develop using <filename>devtool</filename></title>
<para role='writernotes'>
Need the updated wiki stuff here
Sections as follows:
<orderedlist>
<listitem><para role='writernotes'>
Source the oe-init-build-env script.
At this point, we assume the build host is set up and
<filename>poky</filename> repository has been cloned.
</para></listitem>
<listitem><para role='writernotes'>
Be sure your <filename>local.conf</filename> file has
the correct
<ulink url='&YOCTO_DOCS_REF_URL;#var-MACHINE'><filename>MACHINE</filename></ulink>
variable set for the target hardware on which your
kernel image runs.
Also have the
<ulink url='&YOCTO_DOCS_REF_URL;#var-MACHINE_ESSENTIAL_EXTRA_RRECOMMENDS'><filename>MACHINE_ESSENTIAL_EXTRA_RRECOMMENDS</filename></ulink>
variable set equal to "kernel-modules".
</para></listitem>
<listitem><para role='writernotes'>
Create a layer for later that will contain your patches
(if any) to the kernel.
</para></listitem>
<listitem><para role='writernotes'>
Build the extensible SDK.
</para></listitem>
<listitem><para role='writernotes'>
Install the extensible SDK.
</para></listitem>
<listitem><para role='writernotes'>
Set up the terminal so that you can work with the
extensible SDK.
This terminal is known as the "eSDK Terminal" unlike the
terminal that is set up to run BitBake, which is known
as the "BitBake Terminal".
</para></listitem>
<listitem><para role='writernotes'>
Build the initial image using the extensible SDK.
</para></listitem>
</orderedlist>
</para>
<para role='writernotes'>
At this point, the user has enough stuff set up to work on the
kernel.
I will put a section in the "Common Tasks" area of this manual
that finished out how to make a modification to the kernel.
</para>
</section>