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manuals: code insertion simplification over two lines

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(From yocto-docs rev: 28e2192a7c12d64b68061138a9f6c796453eebb1)

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Michael Opdenacker
2021-04-16 18:27:05 +02:00
committed by Richard Purdie
parent 773536c333
commit c3c6de2187
38 changed files with 974 additions and 1949 deletions
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225
documentation/kernel-dev/common.rst
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@@ -54,8 +54,7 @@ section:
1. *Initialize the BitBake Environment:* Before building an extensible
SDK, you need to initialize the BitBake build environment by sourcing
the build environment script (i.e. :ref:`structure-core-script`):
::
the build environment script (i.e. :ref:`structure-core-script`)::
$ cd poky
$ source oe-init-build-env
@@ -83,16 +82,14 @@ section:
In this example we wish to build for qemux86 so we must set the
``MACHINE`` variable to "qemux86" and also add the "kernel-modules".
As described we do this by appending to ``conf/local.conf``:
::
As described we do this by appending to ``conf/local.conf``::
MACHINE = "qemux86"
MACHINE_ESSENTIAL_EXTRA_RRECOMMENDS += "kernel-modules"
3. *Create a Layer for Patches:* You need to create a layer to hold
patches created for the kernel image. You can use the
``bitbake-layers create-layer`` command as follows:
::
``bitbake-layers create-layer`` command as follows::
$ cd poky/build
$ bitbake-layers create-layer ../../meta-mylayer
@@ -116,8 +113,7 @@ section:
4. *Inform the BitBake Build Environment About Your Layer:* As directed
when you created your layer, you need to add the layer to the
:term:`BBLAYERS` variable in the
``bblayers.conf`` file as follows:
::
``bblayers.conf`` file as follows::
$ cd poky/build
$ bitbake-layers add-layer ../../meta-mylayer
@@ -125,16 +121,14 @@ section:
$
5. *Build the Extensible SDK:* Use BitBake to build the extensible SDK
specifically for use with images to be run using QEMU:
::
specifically for use with images to be run using QEMU::
$ cd poky/build
$ bitbake core-image-minimal -c populate_sdk_ext
Once
the build finishes, you can find the SDK installer file (i.e.
``*.sh`` file) in the following directory:
::
``*.sh`` file) in the following directory::
poky/build/tmp/deploy/sdk
@@ -143,8 +137,7 @@ section:
6. *Install the Extensible SDK:* Use the following command to install
the SDK. For this example, install the SDK in the default
``poky_sdk`` directory:
::
``poky_sdk`` directory::
$ cd poky/build/tmp/deploy/sdk
$ ./poky-glibc-x86_64-core-image-minimal-i586-toolchain-ext-&DISTRO;.sh
@@ -172,8 +165,7 @@ section:
BitBake shell used to build the installer.
After opening a new shell, run the SDK environment setup script as
directed by the output from installing the SDK:
::
directed by the output from installing the SDK::
$ source poky_sdk/environment-setup-i586-poky-linux
"SDK environment now set up; additionally you may now run devtool to perform development tasks.
@@ -186,8 +178,7 @@ section:
8. *Build the Clean Image:* The final step in preparing to work on the
kernel is to build an initial image using ``devtool`` in the new
terminal you just set up and initialized for SDK work:
::
terminal you just set up and initialized for SDK work::
$ devtool build-image
Parsing recipes: 100% |##########################################| Time: 0:00:05
@@ -269,16 +260,14 @@ section:
In this example we wish to build for qemux86 so we must set the
``MACHINE`` variable to "qemux86" and also add the "kernel-modules".
As described we do this by appending to ``conf/local.conf``:
::
As described we do this by appending to ``conf/local.conf``::
MACHINE = "qemux86"
MACHINE_ESSENTIAL_EXTRA_RRECOMMENDS += "kernel-modules"
3. *Create a Layer for Patches:* You need to create a layer to hold
patches created for the kernel image. You can use the
``bitbake-layers create-layer`` command as follows:
::
``bitbake-layers create-layer`` command as follows::
$ cd poky/build
$ bitbake-layers create-layer ../../meta-mylayer
@@ -301,8 +290,7 @@ section:
4. *Inform the BitBake Build Environment About Your Layer:* As directed
when you created your layer, you need to add the layer to the
:term:`BBLAYERS` variable in the
``bblayers.conf`` file as follows:
::
``bblayers.conf`` file as follows::
$ cd poky/build
$ bitbake-layers add-layer ../../meta-mylayer
@@ -350,8 +338,7 @@ section:
the ``yocto-4.12`` branch.
The following commands show how to create a local copy of the
``yocto-kernel-cache`` and be in the ``yocto-4.12`` branch:
::
``yocto-kernel-cache`` and be in the ``yocto-4.12`` branch::
$ cd ~
$ git clone git://git.yoctoproject.org/yocto-kernel-cache --branch yocto-4.12
@@ -394,8 +381,7 @@ following section describes how to create a layer without the aid of
tools. These steps assume creation of a layer named ``mylayer`` in your
home directory:
1. *Create Structure*: Create the layer's structure:
::
1. *Create Structure*: Create the layer's structure::
$ mkdir meta-mylayer
$ mkdir meta-mylayer/conf
@@ -409,8 +395,7 @@ home directory:
2. *Create the Layer Configuration File*: Move to the
``meta-mylayer/conf`` directory and create the ``layer.conf`` file as
follows:
::
follows::
# We have a conf and classes directory, add to BBPATH
BBPATH .= ":${LAYERDIR}"
@@ -429,8 +414,7 @@ home directory:
``meta-mylayer/recipes-kernel/linux`` directory and create the
kernel's append file. This example uses the ``linux-yocto-4.12``
kernel. Thus, the name of the append file is
``linux-yocto_4.12.bbappend``:
::
``linux-yocto_4.12.bbappend``::
FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
@@ -483,8 +467,7 @@ The append file should initially extend the
:term:`FILESPATH` search path by
prepending the directory that contains your files to the
:term:`FILESEXTRAPATHS`
variable as follows:
::
variable as follows::
FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
@@ -492,8 +475,7 @@ The path ``${``\ :term:`THISDIR`\ ``}/${``\ :term:`PN`\ ``}``
expands to "linux-yocto" in the current directory for this example. If
you add any new files that modify the kernel recipe and you have
extended ``FILESPATH`` as described above, you must place the files in
your layer in the following area:
::
your layer in the following area::
your-layer/recipes-kernel/linux/linux-yocto/
@@ -582,8 +564,7 @@ To group related configurations into multiple files, you perform a
similar procedure. Here is an example that groups separate
configurations specifically for Ethernet and graphics into their own
files and adds the configurations by using a ``SRC_URI`` statement like
the following in your append file:
::
the following in your append file::
SRC_URI += "file://myconfig.cfg \
file://eth.cfg \
@@ -627,8 +608,7 @@ reference them in :term:`SRC_URI`
statements.
For example, you can apply a three-patch series by adding the following
lines to your linux-yocto ``.bbappend`` file in your layer:
::
lines to your linux-yocto ``.bbappend`` file in your layer::
SRC_URI += "file://0001-first-change.patch"
SRC_URI += "file://0002-second-change.patch"
@@ -658,8 +638,7 @@ If you have a complete, working Linux kernel ``.config`` file you want
to use for the configuration, as before, copy that file to the
appropriate ``${PN}`` directory in your layer's ``recipes-kernel/linux``
directory, and rename the copied file to "defconfig". Then, add the
following lines to the linux-yocto ``.bbappend`` file in your layer:
::
following lines to the linux-yocto ``.bbappend`` file in your layer::
FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
SRC_URI += "file://defconfig"
@@ -685,8 +664,7 @@ Generally speaking, the preferred approach is to determine the
incremental change you want to make and add that as a configuration
fragment. For example, if you want to add support for a basic serial
console, create a file named ``8250.cfg`` in the ``${PN}`` directory
with the following content (without indentation):
::
with the following content (without indentation)::
CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_CONSOLE=y
@@ -698,8 +676,7 @@ with the following content (without indentation):
Next, include this
configuration fragment and extend the ``FILESPATH`` variable in your
``.bbappend`` file:
::
``.bbappend`` file::
FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
SRC_URI += "file://8250.cfg"
@@ -718,8 +695,7 @@ It might be desirable to have kernel configuration fragment support
through a ``defconfig`` file that is pulled from the kernel source tree
for the configured machine. By default, the OpenEmbedded build system
looks for ``defconfig`` files in the layer used for Metadata, which is
"out-of-tree", and then configures them using the following:
::
"out-of-tree", and then configures them using the following::
SRC_URI += "file://defconfig"
@@ -732,16 +708,14 @@ append files, you can direct the OpenEmbedded build system to use a
``defconfig`` file that is "in-tree".
To specify an "in-tree" ``defconfig`` file, use the following statement
form:
::
form::
KBUILD_DEFCONFIG_KMACHINE ?= "defconfig_file"
Here is an example
that assigns the ``KBUILD_DEFCONFIG`` variable based on "raspberrypi2"
and provides the path to the "in-tree" ``defconfig`` file to be used for
a Raspberry Pi 2, which is based on the Broadcom 2708/2709 chipset:
::
a Raspberry Pi 2, which is based on the Broadcom 2708/2709 chipset::
KBUILD_DEFCONFIG_raspberrypi2 ?= "bcm2709_defconfig"
@@ -792,8 +766,7 @@ the ":ref:`kernel-dev/common:getting ready to develop using \`\`devtool\`\``" Se
":ref:`kernel-dev/common:getting ready to develop using \`\`devtool\`\``"
section for more information.
Use the following ``devtool`` command to check out the code:
::
Use the following ``devtool`` command to check out the code::
$ devtool modify linux-yocto
@@ -819,14 +792,12 @@ the ":ref:`kernel-dev/common:getting ready to develop using \`\`devtool\`\``" Se
noted where you can find the source files (e.g.
``poky_sdk/workspace/sources/linux-yocto``). Change to where the
kernel source code is before making your edits to the
``calibrate.c`` file:
::
``calibrate.c`` file::
$ cd poky_sdk/workspace/sources/linux-yocto
2. *Edit the source file*: Edit the ``init/calibrate.c`` file to have
the following changes:
::
the following changes::
void calibrate_delay(void)
{
@@ -846,8 +817,7 @@ the ":ref:`kernel-dev/common:getting ready to develop using \`\`devtool\`\``" Se
.
3. *Build the Updated Kernel Source:* To build the updated kernel
source, use ``devtool``:
::
source, use ``devtool``::
$ devtool build linux-yocto
@@ -872,8 +842,7 @@ the ":ref:`kernel-dev/common:getting ready to develop using \`\`devtool\`\``" Se
using QEMU to verify your changes:
1. *Boot the image*: Boot the modified image in the QEMU emulator
using this command:
::
using this command::
$ runqemu qemux86
@@ -891,8 +860,7 @@ the ":ref:`kernel-dev/common:getting ready to develop using \`\`devtool\`\``" Se
6. *Stage and commit your changes*: Within your eSDK terminal, change
your working directory to where you modified the ``calibrate.c`` file
and use these Git commands to stage and commit your changes:
::
and use these Git commands to stage and commit your changes::
$ cd poky_sdk/workspace/sources/linux-yocto
$ git status
@@ -921,8 +889,7 @@ the ":ref:`kernel-dev/common:getting ready to develop using \`\`devtool\`\``" Se
image that includes your kernel patches. Execute the following
command from your
:term:`Build Directory` in the terminal
set up to run BitBake:
::
set up to run BitBake::
$ cd poky/build
$ bitbake core-image-minimal
@@ -966,14 +933,12 @@ Section.
1. *Change the working directory*: You need to locate the source
files in the local copy of the kernel Git repository. Change to
where the kernel source code is before making your edits to the
``calibrate.c`` file:
::
``calibrate.c`` file::
$ cd ~/linux-yocto-4.12/init
2. *Edit the source file*: Edit the ``calibrate.c`` file to have the
following changes:
::
following changes::
void calibrate_delay(void)
{
@@ -993,8 +958,7 @@ Section.
.
2. *Stage and Commit Your Changes:* Use standard Git commands to stage
and commit the changes you just made:
::
and commit the changes you just made::
$ git add calibrate.c
$ git commit -m "calibrate.c - Added some printk statements"
@@ -1009,13 +973,11 @@ Section.
updated kernel source files. Add
:term:`SRC_URI` and
:term:`SRCREV` statements similar
to the following to your ``local.conf``:
::
to the following to your ``local.conf``::
$ cd poky/build/conf
Add the following to the ``local.conf``:
::
Add the following to the ``local.conf``::
SRC_URI_pn-linux-yocto = "git:///path-to/linux-yocto-4.12;protocol=file;name=machine;branch=standard/base; \
git:///path-to/yocto-kernel-cache;protocol=file;type=kmeta;name=meta;branch=yocto-4.12;destsuffix=${KMETA}"
@@ -1031,16 +993,14 @@ Section.
4. *Build the Image:* With the source modified, your changes staged and
committed, and the ``local.conf`` file pointing to the kernel files,
you can now use BitBake to build the image:
::
you can now use BitBake to build the image::
$ cd poky/build
$ bitbake core-image-minimal
5. *Boot the image*: Boot the modified image in the QEMU emulator using
this command. When prompted to login to the QEMU console, use "root"
with no password:
::
with no password::
$ cd poky/build
$ runqemu qemux86
@@ -1059,8 +1019,7 @@ Section.
7. *Generate the Patch File:* Once you are sure that your patch works
correctly, you can generate a ``*.patch`` file in the kernel source
repository:
::
repository::
$ cd ~/linux-yocto-4.12/init
$ git format-patch -1
@@ -1073,8 +1032,7 @@ Section.
``meta-mylayer``. When the layer was created using the
``yocto-create`` script, no additional hierarchy was created to
support patches. Before moving the patch file, you need to add
additional structure to your layer using the following commands:
::
additional structure to your layer using the following commands::
$ cd ~/meta-mylayer
$ mkdir recipes-kernel
@@ -1083,8 +1041,7 @@ Section.
Once you have created this
hierarchy in your layer, you can move the patch file using the
following command:
::
following command::
$ mv ~/linux-yocto-4.12/init/0001-calibrate.c-Added-some-printk-statements.patch ~/meta-mylayer/recipes-kernel/linux/linux-yocto
@@ -1093,8 +1050,7 @@ Section.
the OpenEmbedded build system to find the patch. The append file
needs to be in your layer's ``recipes-kernel/linux`` directory and it
must be named ``linux-yocto_4.12.bbappend`` and have the following
contents:
::
contents::
FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
SRC_URI_append = "file://0001-calibrate.c-Added-some-printk-statements.patch"
@@ -1113,8 +1069,7 @@ Section.
To build ``core-image-minimal`` again and see the effects of your patch,
you can essentially eliminate the temporary source files saved in
``poky/build/tmp/work/...`` and residual effects of the build by entering
the following sequence of commands:
::
the following sequence of commands::
$ cd poky/build
$ bitbake -c cleanall yocto-linux
@@ -1160,8 +1115,7 @@ environment, you must do the following:
- You must be sure of the state of your build's configuration in the
:term:`Source Directory`.
- Your build host must have the following two packages installed:
::
- Your build host must have the following two packages installed::
libncurses5-dev
libtinfo-dev
@@ -1169,8 +1123,7 @@ environment, you must do the following:
The following commands initialize the BitBake environment, run the
:ref:`ref-tasks-kernel_configme`
task, and launch ``menuconfig``. These commands assume the Source
Directory's top-level folder is ``poky``:
::
Directory's top-level folder is ``poky``::
$ cd poky
$ source oe-init-build-env
@@ -1232,8 +1185,7 @@ the ``.config`` file would be:
Within the ``.config`` file, you can see the kernel settings. For
example, the following entry shows that symmetric multi-processor
support is not set:
::
support is not set::
# CONFIG_SMP is not set
@@ -1274,8 +1226,7 @@ your layer's ``recipes-kernel/linux`` directory, and rename the copied
file to "defconfig" (e.g.
``~/meta-mylayer/recipes-kernel/linux/linux-yocto/defconfig``). Then,
add the following lines to the linux-yocto ``.bbappend`` file in your
layer:
::
layer::
FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
SRC_URI += "file://defconfig"
@@ -1323,8 +1274,7 @@ appear in the ``.config`` file, which is in the :term:`Build Directory`.
It is simple to create a configuration fragment. One method is to use
shell commands. For example, issuing the following from the shell
creates a configuration fragment file named ``my_smp.cfg`` that enables
multi-processor support within the kernel:
::
multi-processor support within the kernel::
$ echo "CONFIG_SMP=y" >> my_smp.cfg
@@ -1342,8 +1292,7 @@ To create a configuration fragment using this method, follow these
steps:
1. *Complete a Build Through Kernel Configuration:* Complete a build at
least through the kernel configuration task as follows:
::
least through the kernel configuration task as follows::
$ bitbake linux-yocto -c kernel_configme -f
@@ -1352,8 +1301,7 @@ steps:
your build state might become unknown, it is best to run this task
prior to starting ``menuconfig``.
2. *Launch menuconfig:* Run the ``menuconfig`` command:
::
2. *Launch menuconfig:* Run the ``menuconfig`` command::
$ bitbake linux-yocto -c menuconfig
@@ -1361,8 +1309,7 @@ steps:
to prepare a configuration fragment. The resulting file
``fragment.cfg`` is placed in the
``${``\ :term:`WORKDIR`\ ``}``
directory:
::
directory::
$ bitbake linux-yocto -c diffconfig
@@ -1387,8 +1334,7 @@ options in a file called ``myconfig.cfg``. If you put that file inside a
directory named ``linux-yocto`` that resides in the same directory as
the kernel's append file within your layer and then add the following
statements to the kernel's append file, those configuration options will
be picked up and applied when the kernel is built:
::
be picked up and applied when the kernel is built::
FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
SRC_URI += "file://myconfig.cfg"
@@ -1397,8 +1343,7 @@ As mentioned earlier, you can group related configurations into multiple
files and name them all in the ``SRC_URI`` statement as well. For
example, you could group separate configurations specifically for
Ethernet and graphics into their own files and add those by using a
``SRC_URI`` statement like the following in your append file:
::
``SRC_URI`` statement like the following in your append file::
SRC_URI += "file://myconfig.cfg \
file://eth.cfg \
@@ -1409,8 +1354,7 @@ Validating Configuration
You can use the
:ref:`ref-tasks-kernel_configcheck`
task to provide configuration validation:
::
task to provide configuration validation::
$ bitbake linux-yocto -c kernel_configcheck -f
@@ -1537,8 +1481,7 @@ To streamline the configuration, do the following:
successfully. Use this configuration file as your baseline.
2. *Run Configure and Check Tasks:* Separately run the
``do_kernel_configme`` and ``do_kernel_configcheck`` tasks:
::
``do_kernel_configme`` and ``do_kernel_configcheck`` tasks::
$ bitbake linux-yocto -c kernel_configme -f
$ bitbake linux-yocto -c kernel_configcheck -f
@@ -1572,8 +1515,7 @@ Expanding Variables
Sometimes it is helpful to determine what a variable expands to during a
build. You can examine the values of variables by examining the
output of the ``bitbake -e`` command. The output is long and is more
easily managed in a text file, which allows for easy searches:
::
easily managed in a text file, which allows for easy searches::
$ bitbake -e virtual/kernel > some_text_file
@@ -1590,15 +1532,13 @@ source directory. Follow these steps to clean up the version string:
1. *Discover the Uncommitted Changes:* Go to the kernel's locally cloned
Git repository (source directory) and use the following Git command
to list the files that have been changed, added, or removed:
::
to list the files that have been changed, added, or removed::
$ git status
2. *Commit the Changes:* You should commit those changes to the kernel
source tree regardless of whether or not you will save, export, or
use the changes:
::
use the changes::
$ git add
$ git commit -s -a -m "getting rid of -dirty"
@@ -1633,8 +1573,7 @@ linux-yocto custom recipe (``linux-yocto-custom.bb``) that uses
``kernel.org`` sources and the Yocto Project Linux kernel tools for
managing kernel Metadata. You can find this recipe in the ``poky`` Git
repository of the Yocto Project :yocto_git:`Source Repository <>`
at:
::
at::
poky/meta-skeleton/recipes-kernel/linux/linux-yocto-custom.bb
@@ -1655,8 +1594,7 @@ Here are some basic steps you can use to work with your own sources:
``defconfig`` file or configuration fragment files in your layer.
When you use the ``linux-yocto-custom.bb`` recipe, you must specify a
configuration. If you do not have a ``defconfig`` file, you can run
the following:
::
the following::
$ make defconfig
@@ -1708,8 +1646,7 @@ Here are some basic steps you can use to work with your own sources:
``LINUX_VERSION`` with the Source Control Manager (SCM) revision
as derived from the :term:`SRCPV`
variable. The combined results are a string with the following
form:
::
form::
3.19.11+git1+68a635bf8dfb64b02263c1ac80c948647cc76d5f_1+218bd8d2022b9852c60d32f0d770931e3cf343e2
@@ -1723,8 +1660,7 @@ Here are some basic steps you can use to work with your own sources:
triggers an explicit build failure. You must change it to match a
list of the machines that your new recipe supports. For example,
to support the ``qemux86`` and ``qemux86-64`` machines, use the
following form:
::
following form::
COMPATIBLE_MACHINE = "qemux86|qemux86-64"
@@ -1807,8 +1743,7 @@ Typically, you will need to set the following variables:
Depending on the build system used by the module sources, you might need
to make some adjustments. For example, a typical module ``Makefile``
looks much like the one provided with the ``hello-mod`` template:
::
looks much like the one provided with the ``hello-mod`` template::
obj-m := hello.o
@@ -1845,8 +1780,7 @@ them appropriately for your machine configuration file:
- :term:`MACHINE_EXTRA_RRECOMMENDS`
Modules are often not required for boot and can be excluded from certain
build configurations. The following allows for the most flexibility:
::
build configurations. The following allows for the most flexibility::
MACHINE_EXTRA_RRECOMMENDS += "kernel-module-mymodule"
@@ -1895,26 +1829,22 @@ branch.
$ git whatchanged origin/standard/base..origin/standard/emenlow
To see short, one line summaries of changes use the ``git log`` command:
::
To see short, one line summaries of changes use the ``git log`` command::
$ git log --oneline origin/standard/base..origin/standard/emenlow
Use this command to see code differences for the changes:
::
Use this command to see code differences for the changes::
$ git diff origin/standard/base..origin/standard/emenlow
Use this command to see the commit log messages and the text
differences:
::
differences::
$ git show origin/standard/base..origin/standard/emenlow
Use this command to create individual patches for each change. Here is
an example that creates patch files for each commit and places them
in your ``Documents`` directory:
::
in your ``Documents`` directory::
$ git format-patch -o $HOME/Documents origin/standard/base..origin/standard/emenlow
@@ -1923,15 +1853,13 @@ Showing a Particular Feature or Branch Change
Tags in the Yocto Project kernel tree divide changes for significant
features or branches. The ``git show`` tag command shows changes based
on a tag. Here is an example that shows ``systemtap`` changes:
::
on a tag. Here is an example that shows ``systemtap`` changes::
$ git show systemtap
You can use the ``git branch --contains`` tag command to
show the branches that contain a particular feature. This command shows
the branches that contain the ``systemtap`` feature:
::
the branches that contain the ``systemtap`` feature::
$ git branch --contains systemtap
@@ -1986,8 +1914,7 @@ build.
searched during the build as potential feature directories.
Continuing with the example, suppose the "test.scc" feature you are
adding has a ``test.scc`` file in the following directory:
::
adding has a ``test.scc`` file in the following directory::
my_recipe
|
@@ -2001,8 +1928,7 @@ build.
a similarly named configuration fragment file ``test.cfg``.
2. *Add the Feature File to SRC_URI:* Add the ``.scc`` file to the
recipe's ``SRC_URI`` statement:
::
recipe's ``SRC_URI`` statement::
SRC_URI_append = " file://test.scc"
@@ -2011,8 +1937,7 @@ build.
3. *Specify the Feature as a Kernel Feature:* Use the
``KERNEL_FEATURES`` statement to specify the feature as a kernel
feature:
::
feature::
KERNEL_FEATURES_append = " test.scc"