[gnome-continuous-yocto/gnomeostree-3.28-rocko: 6712/8267] kernel-dev, dev-manual: Moved Kernel workflow section to kernel-dev
- From: Emmanuele Bassi <ebassi src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gnome-continuous-yocto/gnomeostree-3.28-rocko: 6712/8267] kernel-dev, dev-manual: Moved Kernel workflow section to kernel-dev
- Date: Sun, 17 Dec 2017 05:13:47 +0000 (UTC)
commit 431ceaea6c7786df0b78bf441752229515ac5f0d
Author: Scott Rifenbark <srifenbark gmail com>
Date: Fri Jun 30 14:51:55 2017 -0700
kernel-dev, dev-manual: Moved Kernel workflow section to kernel-dev
Fixes [YOCTO #11630]
The overview section of modifying the kernel needed to be in the
kernel-dev manual and not in the dev-manual. I moved it and took
care of all the links and external references throughout the YP
doc set. One figure was involved that had to be moved to the figures
folder in kernel-dev from dev-manual. That is why the Makefile had
to be edited.
(From yocto-docs rev: 3a704b64544678785b883f82d6e82aedac6790c5)
Signed-off-by: Scott Rifenbark <srifenbark gmail com>
Signed-off-by: Richard Purdie <richard purdie linuxfoundation org>
documentation/Makefile | 3 +-
documentation/dev-manual/dev-manual-model.xml | 147 ---------
.../figures/kernel-dev-flow.png | Bin 35561 -> 35561 bytes
.../kernel-dev/kernel-dev-concepts-appx.xml | 5 +-
documentation/kernel-dev/kernel-dev-intro.xml | 320 ++++++++++++++------
5 files changed, 228 insertions(+), 247 deletions(-)
---
diff --git a/documentation/Makefile b/documentation/Makefile
index 93cf6ca..770ef93 100644
--- a/documentation/Makefile
+++ b/documentation/Makefile
@@ -130,7 +130,6 @@ TARFILES = dev-style.css dev-manual.html \
else
TARFILES = dev-style.css dev-manual.html \
figures/dev-title.png \
- figures/kernel-dev-flow.png \
figures/recipe-workflow.png \
figures/devtool-add-flow.png figures/devtool-modify-flow.png \
figures/devtool-upgrade-flow.png \
@@ -330,7 +329,7 @@ XSLTOPTS = --xinclude
ALLPREQ = html eclipse tarball
TARFILES = kernel-dev.html kernel-dev-style.css \
figures/kernel-dev-title.png figures/kernel-overview-2-generic \
- figures/kernel-architecture-overview.png \
+ figures/kernel-architecture-overview.png figures/kernel-dev-flow.png \
eclipse
MANUALS = $(DOC)/$(DOC).html $(DOC)/eclipse
FIGURES = figures
diff --git a/documentation/dev-manual/dev-manual-model.xml b/documentation/dev-manual/dev-manual-model.xml
index 0055bcc..b1b5efa 100644
--- a/documentation/dev-manual/dev-manual-model.xml
+++ b/documentation/dev-manual/dev-manual-model.xml
@@ -41,153 +41,6 @@
</itemizedlist>
</para>
-<section id='system-development-model'>
- <title>System Development Workflow</title>
-
- <para>
- System development involves modification or creation of an image that you want to run on
- a specific hardware target.
- Usually, when you want to create an image that runs on embedded hardware, the image does
- not require the same number of features that a full-fledged Linux distribution provides.
- Thus, you can create a much smaller image that is designed to use only the
- features for your particular hardware.
- </para>
-
- <para>
- To help you understand how system development works in the Yocto Project, this section
- covers two types of image development: BSP creation and kernel modification or
- configuration.
- </para>
-
- <section id='modifying-the-kernel'>
- <title><anchor id='kernel-spot' />Modifying the Kernel</title>
-
- <para>
- Kernel modification involves changing the Yocto Project kernel, which could involve changing
- configuration options as well as adding new kernel recipes.
- Configuration changes can be added in the form of configuration fragments, while recipe
- modification comes through the kernel's <filename>recipes-kernel</filename> area
- in a kernel layer you create.
- </para>
-
- <para>
- The remainder of this section presents a high-level overview of the Yocto Project
- kernel architecture and the steps to modify the kernel.
- You can reference the
- "<link linkend='patching-the-kernel'>Patching the Kernel</link>" section
- for an example that changes the source code of the kernel.
- For information on how to configure the kernel, see the
- "<link linkend='configuring-the-kernel'>Configuring the Kernel</link>" section.
- For more information on the kernel and on modifying the kernel, see the
- <ulink url='&YOCTO_DOCS_KERNEL_DEV_URL;'>Yocto Project Linux Kernel Development Manual</ulink>.
- </para>
-
- <section id='kernel-modification-workflow'>
- <title>Kernel Modification Workflow</title>
-
- <para>
- This illustration and the following list summarizes the kernel modification general workflow.
- </para>
-
- <para>
- <imagedata fileref="figures/kernel-dev-flow.png"
- width="6in" depth="5in" align="center" scalefit="1" />
- </para>
-
- <para>
- <orderedlist>
- <listitem><para><emphasis>Set up your host development system to support
- development using the Yocto Project</emphasis>: See
- "<ulink url='&YOCTO_DOCS_QS_URL;#the-linux-distro'>The Linux Distribution</ulink>"
and
- "<ulink url='&YOCTO_DOCS_QS_URL;#packages'>The Build Host Packages</ulink>" sections
both
- in the Yocto Project Quick Start for requirements.</para></listitem>
- <listitem><para><emphasis>Establish a local copy of project files on your
- system</emphasis>: Having the
- <ulink url='&YOCTO_DOCS_REF_URL;#source-directory'>Source Directory</ulink>
- on your system gives you access to the build process and tools
- you need.
- For information on how to get these files, see the
- "<link linkend='cloning-the-poky-repository'>Cloning the <filename>poky</filename>
Repository</link>"
- section.
- </para></listitem>
- <listitem><para><emphasis>Establish the temporary kernel source files</emphasis>:
- Temporary kernel source files are kept in the
- <ulink url='&YOCTO_DOCS_REF_URL;#build-directory'>Build Directory</ulink>
- created by the
- OpenEmbedded build system when you run BitBake.
- If you have never built the kernel in which you are
- interested, you need to run an initial build to
- establish local kernel source files.</para>
- <para>If you are building an image for the first time, you need to get the build
- environment ready by sourcing an environment setup script
- (i.e. <filename>oe-init-build-env</filename> or
- <filename>oe-init-build-env-memres</filename>).
- You also need to be sure two key configuration files
- (<filename>local.conf</filename> and <filename>bblayers.conf</filename>)
- are configured appropriately.</para>
- <para>The entire process for building an image is overviewed in the
- "<ulink url='&YOCTO_DOCS_QS_URL;#qs-building-images'>Building Images</ulink>"
- section of the Yocto Project Quick Start.
- You might want to reference this information.
- You can find more information on BitBake in the
- <ulink url='&YOCTO_DOCS_BB_URL;'>BitBake User Manual</ulink>.
- </para>
- <para>The build process supports several types of images to satisfy different needs.
- See the "<ulink url='&YOCTO_DOCS_REF_URL;#ref-images'>Images</ulink>" chapter in
- the Yocto Project Reference Manual for information on supported images.
- </para></listitem>
- <listitem><para><emphasis>Make changes to the kernel source code if
- applicable</emphasis>: Modifying the kernel does not always mean directly
- changing source files.
- However, if you have to do this, you make the changes to the files in the
- Build Directory.</para></listitem>
- <listitem><para><emphasis>Make kernel configuration changes if applicable</emphasis>:
- If your situation calls for changing the kernel's
- configuration, you can use
- <ulink
url='&YOCTO_DOCS_KERNEL_DEV_URL;#generating-configuration-files'><filename>menuconfig</filename></ulink>,
- which allows you to interactively develop and test the
- configuration changes you are making to the kernel.
- Saving changes you make with
- <filename>menuconfig</filename> updates
- the kernel's <filename>.config</filename> file.
- <note><title>Warning</title>
- Try to resist the temptation to directly edit an
- existing <filename>.config</filename> file, which is
- found in the Build Directory among the source code
- used for the build (e.g. see the workflow illustration
- in the
- "<link linkend='kernel-modification-workflow'>Kernel Modification
Workflow</link>"
- section).
- Doing so, can produce unexpected results when the
- OpenEmbedded build system regenerates the configuration
- file.
- </note>
- Once you are satisfied with the configuration
- changes made using <filename>menuconfig</filename>
- and you have saved them, you can directly compare the
- resulting <filename>.config</filename> file against an
- existing original and gather those changes into a
- <link linkend='creating-config-fragments'>configuration fragment file</link>
- to be referenced from within the kernel's
- <filename>.bbappend</filename> file.</para>
-
- <para>Additionally, if you are working in a BSP layer
- and need to modify the BSP's kernel's configuration,
- you can use the
- <ulink
url='&YOCTO_DOCS_BSP_URL;#managing-kernel-patches-and-config-items-with-yocto-kernel'><filename>yocto-kernel</filename></ulink>
- script as well as <filename>menuconfig</filename>.
- The <filename>yocto-kernel</filename> script lets
- you interactively set up kernel configurations.
- </para></listitem>
- <listitem><para><emphasis>Rebuild the kernel image with your changes</emphasis>:
- Rebuilding the kernel image applies your changes.
- </para></listitem>
- </orderedlist>
- </para>
- </section>
- </section>
-</section>
-
<section id="dev-modifying-source-code">
<title>Modifying Source Code</title>
diff --git a/documentation/kernel-dev/kernel-dev-concepts-appx.xml
b/documentation/kernel-dev/kernel-dev-concepts-appx.xml
index 8eb8c30..7f6b82f 100644
--- a/documentation/kernel-dev/kernel-dev-concepts-appx.xml
+++ b/documentation/kernel-dev/kernel-dev-concepts-appx.xml
@@ -406,9 +406,8 @@
Yocto Project, is the preferred method by which to
modify the kernel.
See the
- "<ulink url='&YOCTO_DOCS_DEV_URL;#kernel-modification-workflow'>Kernel Modification
Workflow</ulink>"
- section in the Yocto Project Development Manual for
- information.
+ "<link linkend='kernel-modification-workflow'>Kernel Modification Workflow</link>"
+ section.
</para></listitem>
<listitem><para>
<emphasis>Cloned Repository:</emphasis>
diff --git a/documentation/kernel-dev/kernel-dev-intro.xml b/documentation/kernel-dev/kernel-dev-intro.xml
index 83ca988..9f385d9 100644
--- a/documentation/kernel-dev/kernel-dev-intro.xml
+++ b/documentation/kernel-dev/kernel-dev-intro.xml
@@ -5,105 +5,234 @@
<chapter id='kernel-dev-intro'>
<title>Introduction</title>
-<!--
-<para>
- <emphasis>AR - Darren Hart:</emphasis> See if the concepts in these
- three bullets are adequately covered in somewhere in this manual:
- <itemizedlist>
- <listitem><para>Do we convey that our kernel Git repositories
- have a clear and continuous history, similar to the way the
- kernel Git repositories for <filename>kernel.org</filename>
- do.
- </para></listitem>
- <listitem><para>Does the manual note that Yocto Project delivers
- a key set of supported kernel types, where
- each type is tailored to meet a specific use (e.g. networking,
- consumer, devices, and so forth).</para></listitem>
- <listitem><para>Do we convey that the Yocto Project uses a
- Git branching strategy that, from a
- developer's point of view, results in a linear path from the
- baseline kernel.org, through a select group of features and
- ends with their BSP-specific commits.</para></listitem>
- </itemizedlist>
-</para>
--->
+<section id='kernel-dev-overview'>
+ <title>Overview</title>
- <section id='kernel-dev-overview'>
- <title>Overview</title>
+ <para>
+ Regardless of how you intend to make use of the Yocto Project,
+ chances are you will work with the Linux kernel.
+ This manual introduces the kernel development process and
+ provides background information on the Yocto Linux kernel
+ <ulink url='&YOCTO_DOCS_REF_URL;#metadata'>Metadata</ulink>,
+ describes common tasks you can perform using the kernel tools,
+ and shows you how to use the kernel Metadata needed to work with
+ the kernel inside the Yocto Project.
+ </para>
- <para>
- Regardless of how you intend to make use of the Yocto Project,
- chances are you will work with the Linux kernel.
- This manual provides background information on the Yocto Linux kernel
- <ulink url='&YOCTO_DOCS_REF_URL;#metadata'>Metadata</ulink>,
- describes common tasks you can perform using the kernel tools,
- and shows you how to use the kernel Metadata needed to work with
- the kernel inside the Yocto Project.
- </para>
-
- <para>
- Each Yocto Project release has a set of linux-yocto recipes, whose
- Git repositories you can view in the Yocto
- <ulink url='&YOCTO_GIT_URL;'>Source Repositories</ulink> under
- the "Yocto Linux Kernel" heading.
- New recipes for the release track the latest upstream developments
- and introduce newly-supported platforms.
- Previous recipes in the release are refreshed and supported for at
- least one additional release.
- As they align, these previous releases are updated to include the
- latest from the
- <ulink url='&YOCTO_HOME_URL;/organization/long-term-support-initiative-ltsi'>Long Term Support
Initiative</ulink>
- (LTSI) project.
- Also included is a linux-yocto development recipe
- (<filename>linux-yocto-dev.bb</filename>) should you want to work
- with the very latest in upstream Linux kernel development and
- kernel Metadata development.
- </para>
+ <para>
+ Each Yocto Project release has a set of Yocto Linux kernel recipes,
+ whose Git repositories you can view in the Yocto
+ <ulink url='&YOCTO_GIT_URL;'>Source Repositories</ulink> under
+ the "Yocto Linux Kernel" heading.
+ New recipes for the release track the latest Linux kernel
+ upstream developments from
+ <ulink url='http://www.kernel.org'></ulink> and introduce
+ newly-supported platforms.
+ Previous recipes in the release are refreshed and supported for at
+ least one additional Yocto Project release.
+ As they align, these previous releases are updated to include the
+ latest from the
+ <ulink url='&YOCTO_HOME_URL;/organization/long-term-support-initiative-ltsi'>Long Term Support
Initiative</ulink>
+ (LTSI) project.
+ Also included is a Yocto Linux kernel development recipe
+ (<filename>linux-yocto-dev.bb</filename>) should you want to work
+ with the very latest in upstream Yocto Linux kernel development and
+ kernel Metadata development.
+ <note>
+ For more on Yocto Linux kernels, see the
+ "<link linkend='kernel-big-picture'>Yocto Project Kernel Development and Maintenance</link>
+ section.
+ </note>
+ </para>
- <para>
- The Yocto Project also provides a powerful set of kernel
- tools for managing Linux kernel sources and configuration data.
- You can use these tools to make a single configuration change,
- apply multiple patches, or work with your own kernel sources.
- </para>
+ <para>
+ The Yocto Project also provides a powerful set of kernel
+ tools for managing Yocto Linux kernel sources and configuration data.
+ You can use these tools to make a single configuration change,
+ apply multiple patches, or work with your own kernel sources.
+ </para>
- <para>
- In particular, the kernel tools allow you to generate configuration
- fragments that specify only what you must, and nothing more.
- Configuration fragments only need to contain the highest level
- visible <filename>CONFIG</filename> options as presented by the Linux
- kernel <filename>menuconfig</filename> system.
- Contrast this against a complete Linux kernel
- <filename>.config</filename>, which includes all the automatically
- selected <filename>CONFIG</filename> options.
- This efficiency reduces your maintenance effort and allows you
- to further separate your configuration in ways that make sense for
- your project.
- A common split separates policy and hardware.
- For example, all your kernels might support
- the <filename>proc</filename> and <filename>sys</filename> filesystems,
- but only specific boards require sound, USB, or specific drivers.
- Specifying these configurations individually allows you to aggregate
- them together as needed, but maintains them in only one place.
- Similar logic applies to separating source changes.
- </para>
+ <para>
+ In particular, the kernel tools allow you to generate configuration
+ fragments that specify only what you must, and nothing more.
+ Configuration fragments only need to contain the highest level
+ visible <filename>CONFIG</filename> options as presented by the
+ Yocto Linux kernel <filename>menuconfig</filename> system.
+ Contrast this against a complete Yocto Linux kernel
+ <filename>.config</filename> file, which includes all the automatically
+ selected <filename>CONFIG</filename> options.
+ This efficiency reduces your maintenance effort and allows you
+ to further separate your configuration in ways that make sense for
+ your project.
+ A common split separates policy and hardware.
+ For example, all your kernels might support the
+ <filename>proc</filename> and <filename>sys</filename> filesystems,
+ but only specific boards require sound, USB, or specific drivers.
+ Specifying these configurations individually allows you to aggregate
+ them together as needed, but maintains them in only one place.
+ Similar logic applies to separating source changes.
+ </para>
- <para>
- If you do not maintain your own kernel sources and need to make
- only minimal changes to the sources, the released recipes provide a
- vetted base upon which to layer your changes.
- Doing so allows you to benefit from the continual kernel
- integration and testing performed during development of the
- Yocto Project.
- </para>
+ <para>
+ If you do not maintain your own kernel sources and need to make
+ only minimal changes to the sources, the released recipes provide a
+ vetted base upon which to layer your changes.
+ Doing so allows you to benefit from the continual kernel
+ integration and testing performed during development of the
+ Yocto Project.
+ </para>
+
+ <para>
+ If, instead, you have a very specific Linux kernel source tree
+ and are unable to align with one of the official Yocto Linux kernel
+ recipes, an alternative exists by which you can use the Yocto
+ Project Linux kernel tools with your own kernel sources.
+ </para>
+</section>
+
+<section id='kernel-modification-workflow'>
+ <title>Kernel Modification Workflow</title>
+
+ <para>
+ Kernel modification involves changing the Yocto Project kernel,
+ which could involve changing configuration options as well as adding
+ new kernel recipes.
+ Configuration changes can be added in the form of configuration
+ fragments, while recipe modification comes through the kernel's
+ <filename>recipes-kernel</filename> area in a kernel layer you create.
+ </para>
+
+ <para>
+ This section presents a high-level overview of the Yocto Project
+ kernel modification workflow.
+ You can find additional information here:
+ <itemizedlist>
+ <listitem><para>
+ "<ulink url='&YOCTO_DOCS_DEV_URL;#patching-the-kernel'>Patching the Kernel</ulink>"
+ in the Yocto Project Development Manual.
+ </para></listitem>
+ <listitem><para>
+ "<ulink url='&YOCTO_DOCS_DEV_URL;#configuring-the-kernel'>Configuring the Kernel</ulink>"
+ in the Yocto Project Development Manual.
+ </para></listitem>
+ </itemizedlist>
+ This illustration and the following list summarizes the kernel
+ modification general workflow.
+ <imagedata fileref="figures/kernel-dev-flow.png"
+ width="6in" depth="5in" align="center" scalefit="1" />
+ </para>
+
+ <para>
+ <orderedlist>
+ <listitem><para>
+ <emphasis>Set up Your Host Development System to Support
+ Development Using the Yocto Project</emphasis>:
+ See
+ "<ulink url='&YOCTO_DOCS_QS_URL;#the-linux-distro'>The Linux Distribution</ulink>"
+ and
+ "<ulink url='&YOCTO_DOCS_QS_URL;#packages'>The Build Host Packages</ulink>"
+ sections both in the Yocto Project Quick Start for
+ requirements.
+ </para></listitem>
+ <listitem><para>
+ <emphasis>Clone the <filename>poky</filename> Repository</emphasis>:
+ Having the
+ <ulink url='&YOCTO_DOCS_REF_URL;#source-directory'>Source Directory</ulink>
+ on your system gives you access to the build process and tools
+ you need.
+ For information on how to get these files, see the
+ "<ulink url='&YOCTO_DOCS_DEV_URL;#cloning-the-poky-repository'>Cloning the
<filename>poky</filename> Repository</ulink>"
+ section in the Yocto Project Development Manual.
+ </para></listitem>
+ <listitem><para>
+ <emphasis>Establish the Temporary Kernel Source Files</emphasis>:
+ Temporary kernel source files are kept in the
+ <ulink url='&YOCTO_DOCS_REF_URL;#build-directory'>Build Directory</ulink>
+ created by the OpenEmbedded build system when you run BitBake.
+ If you have never built the kernel in which you are
+ interested, you need to run an initial build to
+ establish local kernel source files.</para>
+
+ <para>If you are building an image for the first time, you
+ need to get the build environment ready by sourcing an
+ environment setup script
+ (i.e. <filename>oe-init-build-env</filename> or
+ <filename>oe-init-build-env-memres</filename>).
+ You also need to be sure two key configuration files
+ (<filename>local.conf</filename> and
+ <filename>bblayers.conf</filename>) are configured
+ appropriately.</para>
+
+ <para>The entire process for building an image is overviewed
+ in the
+ "<ulink url='&YOCTO_DOCS_QS_URL;#qs-building-images'>Building Images</ulink>"
+ section of the Yocto Project Quick Start.
+ You might want to reference this information.
+ You can find more information on BitBake in the
+ <ulink url='&YOCTO_DOCS_BB_URL;'>BitBake User Manual</ulink>.
+ </para>
+
+ <para>The build process supports several types of images to
+ satisfy different needs.
+ See the "<ulink url='&YOCTO_DOCS_REF_URL;#ref-images'>Images</ulink>"
+ chapter in the Yocto Project Reference Manual for information
+ on supported images.
+ </para></listitem>
+ <listitem><para>
+ <emphasis>Make Changes to the Kernel Source Code if
+ applicable</emphasis>:
+ Modifying the kernel does not always mean directly
+ changing source files.
+ However, if you have to do this, you make the changes to the
+ files in the Build Directory.
+ </para></listitem>
+ <listitem><para>
+ <emphasis>Make Kernel Configuration Changes if
+ Applicable</emphasis>:
+ If your situation calls for changing the kernel's
+ configuration, you can use
+ <link linkend='generating-configuration-files'><filename>menuconfig</filename></link>,
+ which allows you to interactively develop and test the
+ configuration changes you are making to the kernel.
+ Saving changes you make with <filename>menuconfig</filename>
+ updates the kernel's <filename>.config</filename> file.
+ <note><title>Warning</title>
+ Try to resist the temptation to directly edit an
+ existing <filename>.config</filename> file, which is
+ found in the Build Directory among the source code
+ used for the build (e.g. see the workflow illustration
+ in the
+ "<link linkend='kernel-modification-workflow'>Kernel Modification Workflow</link>"
+ section).
+ Doing so, can produce unexpected results when the
+ OpenEmbedded build system regenerates the configuration
+ file.
+ </note>
+ Once you are satisfied with the configuration
+ changes made using <filename>menuconfig</filename>
+ and you have saved them, you can directly compare the
+ resulting <filename>.config</filename> file against an
+ existing original and gather those changes into a
+ <ulink url='&YOCTO_DOCS_DEV_URL;#creating-config-fragments'>configuration fragment
file</ulink>
+ to be referenced from within the kernel's
+ <filename>.bbappend</filename> file.</para>
+
+ <para>Additionally, if you are working in a BSP layer
+ and need to modify the BSP's kernel's configuration,
+ you can use the
+ <ulink
url='&YOCTO_DOCS_BSP_URL;#managing-kernel-patches-and-config-items-with-yocto-kernel'><filename>yocto-kernel</filename></ulink>
+ script as well as <filename>menuconfig</filename>.
+ The <filename>yocto-kernel</filename> script lets
+ you interactively set up kernel configurations.
+ </para></listitem>
+ <listitem><para>
+ <emphasis>Rebuild the Kernel Image With Your Changes</emphasis>:
+ Rebuilding the kernel image applies your changes.
+ </para></listitem>
+ </orderedlist>
+ </para>
+</section>
- <para>
- If, instead, you have a very specific Linux kernel source tree
- and are unable to align with one of the official linux-yocto
- recipes, an alternative exists by which you can use the Yocto
- Project Linux kernel tools with your own kernel sources.
- </para>
- </section>
<section id='kernel-dev-other-resources'>
<title>Other Resources</title>
@@ -126,8 +255,9 @@
</para></listitem>
<listitem><para>The "<ulink
url='&YOCTO_DOCS_DEV_URL;#understanding-and-creating-layers'>Understanding and Creating Layers</ulink>"
section
in the Yocto Project Development Manual</para></listitem>
- <listitem><para>The "<ulink url='&YOCTO_DOCS_DEV_URL;#modifying-the-kernel'>Modifying the
Kernel</ulink>" section
- in the Yocto Project Development Manual.</para></listitem>
+ <listitem><para>The "<link linkend='kernel-modification-workflow'>Kernel Modification
Workflow</link>"
+ section.
+ </para></listitem>
</itemizedlist>
</para>
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