Move devtool doc from extensible to dev manual

[YOCTO #13417]

devtool is not directly tied to the Extensible SDK anymore, and
instructions in there can be split and added to the development manual.

This patch is a simple bulk move, except for the following:

- Intro added to the devtool.rst document (mostly copy-pasted from the
  devtool quick reference in the ref-manual).
- Figures renamed to remove "sdk-" from filenames.
- References to sdk-manual/extensible replaced by dev-manual/devtool.

Reported-By: Paul Eggleton <bluelightning@bluelightning.org>
(From yocto-docs rev: 044d3185b858fce1febcfe3a6834b883f9a598fa)

Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

13 files changed, 1338 insertions, 1327 deletions

diff --git a/documentation/dev-manual/devtool.rst b/documentation/dev-manual/devtool.rst
new file mode 100644
index 0000000000..2e3de7a096
--- /dev/null
+++ b/documentation/dev-manual/devtool.rst
@@ -0,0 +1,1327 @@
+.. SPDX-License-Identifier: CC-BY-SA-2.0-UK
+
+Using the ``devtool`` command-line tool
+***************************************
+
+The ``devtool`` command-line tool provides a number of features that
+help you build, test, and package software. This command is available
+alongside the ``bitbake`` command. Additionally, the ``devtool`` command
+is a key part of the :term:`Extensible Software Development Kit (eSDK)`.
+
+Use ``devtool add`` to Add an Application
+=========================================
+
+The ``devtool add`` command generates a new recipe based on existing
+source code. This command takes advantage of the
+:ref:`devtool-the-workspace-layer-structure`
+layer that many ``devtool`` commands use. The command is flexible enough
+to allow you to extract source code into both the workspace or a
+separate local Git repository and to use existing code that does not
+need to be extracted.
+
+Depending on your particular scenario, the arguments and options you use
+with ``devtool add`` form different combinations. The following diagram
+shows common development flows you would use with the ``devtool add``
+command:
+
+.. image:: figures/devtool-add-flow.png
+   :width: 100%
+
+#. *Generating the New Recipe*: The top part of the flow shows three
+   scenarios by which you could use ``devtool add`` to generate a recipe
+   based on existing source code.
+
+   In a shared development environment, it is typical for other
+   developers to be responsible for various areas of source code. As a
+   developer, you are probably interested in using that source code as
+   part of your development within the Yocto Project. All you need is
+   access to the code, a recipe, and a controlled area in which to do
+   your work.
+
+   Within the diagram, three possible scenarios feed into the
+   ``devtool add`` workflow:
+
+   -  *Left*: The left scenario in the figure represents a common
+      situation where the source code does not exist locally and needs
+      to be extracted. In this situation, the source code is extracted
+      to the default workspace --- you do not want the files in some
+      specific location outside of the workspace. Thus, everything you
+      need will be located in the workspace::
+
+         $ devtool add recipe fetchuri
+
+      With this command, ``devtool`` extracts the upstream
+      source files into a local Git repository within the ``sources``
+      folder. The command then creates a recipe named recipe and a
+      corresponding append file in the workspace. If you do not provide
+      recipe, the command makes an attempt to determine the recipe name.
+
+   -  *Middle*: The middle scenario in the figure also represents a
+      situation where the source code does not exist locally. In this
+      case, the code is again upstream and needs to be extracted to some
+      local area --- this time outside of the default workspace.
+
+      .. note::
+
+         If required, ``devtool`` always creates a Git repository locally
+         during the extraction.
+
+      Furthermore, the first positional argument ``srctree`` in this case
+      identifies where the ``devtool add`` command will locate the
+      extracted code outside of the workspace. You need to specify an
+      empty directory::
+
+         $ devtool add recipe srctree fetchuri
+
+      In summary, the source code is pulled from fetchuri and extracted into the
+      location defined by ``srctree`` as a local Git repository.
+
+      Within workspace, ``devtool`` creates a recipe named recipe along
+      with an associated append file.
+
+   -  *Right*: The right scenario in the figure represents a situation
+      where the ``srctree`` has been previously prepared outside of the
+      ``devtool`` workspace.
+
+      The following command provides a new recipe name and identifies
+      the existing source tree location::
+
+         $ devtool add recipe srctree
+
+      The command examines the source code and creates a recipe named
+      recipe for the code and places the recipe into the workspace.
+
+      Because the extracted source code already exists, ``devtool`` does
+      not try to relocate the source code into the workspace --- only the
+      new recipe is placed in the workspace.
+
+      Aside from a recipe folder, the command also creates an associated
+      append folder and places an initial ``*.bbappend`` file within.
+
+#. *Edit the Recipe*: You can use ``devtool edit-recipe`` to open up the
+   editor as defined by the ``$EDITOR`` environment variable and modify
+   the file::
+
+      $ devtool edit-recipe recipe
+
+   From within the editor, you can make modifications to the recipe that
+   take effect when you build it later.
+
+#. *Build the Recipe or Rebuild the Image*: The next step you take
+   depends on what you are going to do with the new code.
+
+   If you need to eventually move the build output to the target
+   hardware, use the following ``devtool`` command::
+
+      $ devtool build recipe
+
+   On the other hand, if you want an image to contain the recipe's
+   packages from the workspace for immediate deployment onto a device
+   (e.g. for testing purposes), you can use the ``devtool build-image``
+   command::
+
+      $ devtool build-image image
+
+#. *Deploy the Build Output*: When you use the ``devtool build`` command
+   to build out your recipe, you probably want to see if the resulting
+   build output works as expected on the target hardware.
+
+   .. note::
+
+      This step assumes you have a previously built image that is
+      already either running in QEMU or is running on actual hardware.
+      Also, it is assumed that for deployment of the image to the
+      target, SSH is installed in the image and, if the image is running
+      on real hardware, you have network access to and from your
+      development machine.
+
+   You can deploy your build output to that target hardware by using the
+   ``devtool deploy-target`` command::
+
+      $ devtool deploy-target recipe target
+
+   The target is a live target machine running as an SSH server.
+
+   You can, of course, also deploy the image you build to actual
+   hardware by using the ``devtool build-image`` command. However,
+   ``devtool`` does not provide a specific command that allows you to
+   deploy the image to actual hardware.
+
+#. *Finish Your Work With the Recipe*: The ``devtool finish`` command
+   creates any patches corresponding to commits in the local Git
+   repository, moves the new recipe to a more permanent layer, and then
+   resets the recipe so that the recipe is built normally rather than
+   from the workspace::
+
+      $ devtool finish recipe layer
+
+   .. note::
+
+      Any changes you want to turn into patches must be committed to the
+      Git repository in the source tree.
+
+   As mentioned, the ``devtool finish`` command moves the final recipe
+   to its permanent layer.
+
+   As a final process of the ``devtool finish`` command, the state of
+   the standard layers and the upstream source is restored so that you
+   can build the recipe from those areas rather than the workspace.
+
+   .. note::
+
+      You can use the ``devtool reset`` command to put things back should you
+      decide you do not want to proceed with your work. If you do use this
+      command, realize that the source tree is preserved.
+
+Use ``devtool modify`` to Modify the Source of an Existing Component
+====================================================================
+
+The ``devtool modify`` command prepares the way to work on existing code
+that already has a local recipe in place that is used to build the
+software. The command is flexible enough to allow you to extract code
+from an upstream source, specify the existing recipe, and keep track of
+and gather any patch files from other developers that are associated
+with the code.
+
+Depending on your particular scenario, the arguments and options you use
+with ``devtool modify`` form different combinations. The following
+diagram shows common development flows for the ``devtool modify``
+command:
+
+.. image:: figures/devtool-modify-flow.png
+   :width: 100%
+
+#. *Preparing to Modify the Code*: The top part of the flow shows three
+   scenarios by which you could use ``devtool modify`` to prepare to
+   work on source files. Each scenario assumes the following:
+
+   -  The recipe exists locally in a layer external to the ``devtool``
+      workspace.
+
+   -  The source files exist either upstream in an un-extracted state or
+      locally in a previously extracted state.
+
+   The typical situation is where another developer has created a layer
+   for use with the Yocto Project and their recipe already resides in
+   that layer. Furthermore, their source code is readily available
+   either upstream or locally.
+
+   -  *Left*: The left scenario in the figure represents a common
+      situation where the source code does not exist locally and it
+      needs to be extracted from an upstream source. In this situation,
+      the source is extracted into the default ``devtool`` workspace
+      location. The recipe, in this scenario, is in its own layer
+      outside the workspace (i.e. ``meta-``\ layername).
+
+      The following command identifies the recipe and, by default,
+      extracts the source files::
+
+         $ devtool modify recipe
+
+      Once ``devtool`` locates the recipe, ``devtool`` uses the recipe's
+      :term:`SRC_URI` statements to locate the source code and any local
+      patch files from other developers.
+
+      With this scenario, there is no ``srctree`` argument. Consequently, the
+      default behavior of the ``devtool modify`` command is to extract
+      the source files pointed to by the :term:`SRC_URI` statements into a
+      local Git structure. Furthermore, the location for the extracted
+      source is the default area within the ``devtool`` workspace. The
+      result is that the command sets up both the source code and an
+      append file within the workspace while the recipe remains in its
+      original location.
+
+      Additionally, if you have any non-patch local files (i.e. files
+      referred to with ``file://`` entries in :term:`SRC_URI` statement
+      excluding ``*.patch/`` or ``*.diff``), these files are copied to
+      an ``oe-local-files`` folder under the newly created source tree.
+      Copying the files here gives you a convenient area from which you
+      can modify the files. Any changes or additions you make to those
+      files are incorporated into the build the next time you build the
+      software just as are other changes you might have made to the
+      source.
+
+   -  *Middle*: The middle scenario in the figure represents a situation
+      where the source code also does not exist locally. In this case,
+      the code is again upstream and needs to be extracted to some local
+      area as a Git repository. The recipe, in this scenario, is again
+      local and in its own layer outside the workspace.
+
+      The following command tells ``devtool`` the recipe with which to
+      work and, in this case, identifies a local area for the extracted
+      source files that exists outside of the default ``devtool``
+      workspace::
+
+         $ devtool modify recipe srctree
+
+      .. note::
+
+         You cannot provide a URL for ``srctree`` using the ``devtool`` command.
+
+      As with all extractions, the command uses the recipe's :term:`SRC_URI`
+      statements to locate the source files and any associated patch
+      files. Non-patch files are copied to an ``oe-local-files`` folder
+      under the newly created source tree.
+
+      Once the files are located, the command by default extracts them
+      into ``srctree``.
+
+      Within workspace, ``devtool`` creates an append file for the
+      recipe. The recipe remains in its original location but the source
+      files are extracted to the location you provide with ``srctree``.
+
+   -  *Right*: The right scenario in the figure represents a situation
+      where the source tree (``srctree``) already exists locally as a
+      previously extracted Git structure outside of the ``devtool``
+      workspace. In this example, the recipe also exists elsewhere
+      locally in its own layer.
+
+      The following command tells ``devtool`` the recipe with which to
+      work, uses the "-n" option to indicate source does not need to be
+      extracted, and uses ``srctree`` to point to the previously extracted
+      source files::
+
+         $ devtool modify -n recipe srctree
+
+      If an ``oe-local-files`` subdirectory happens to exist and it
+      contains non-patch files, the files are used. However, if the
+      subdirectory does not exist and you run the ``devtool finish``
+      command, any non-patch files that might exist next to the recipe
+      are removed because it appears to ``devtool`` that you have
+      deleted those files.
+
+      Once the ``devtool modify`` command finishes, it creates only an
+      append file for the recipe in the ``devtool`` workspace. The
+      recipe and the source code remain in their original locations.
+
+#. *Edit the Source*: Once you have used the ``devtool modify`` command,
+   you are free to make changes to the source files. You can use any
+   editor you like to make and save your source code modifications.
+
+#. *Build the Recipe or Rebuild the Image*: The next step you take
+   depends on what you are going to do with the new code.
+
+   If you need to eventually move the build output to the target
+   hardware, use the following ``devtool`` command::
+
+      $ devtool build recipe
+
+   On the other hand, if you want an image to contain the recipe's
+   packages from the workspace for immediate deployment onto a device
+   (e.g. for testing purposes), you can use the ``devtool build-image``
+   command::
+
+      $ devtool build-image image
+
+#. *Deploy the Build Output*: When you use the ``devtool build`` command
+   to build out your recipe, you probably want to see if the resulting
+   build output works as expected on target hardware.
+
+   .. note::
+
+      This step assumes you have a previously built image that is
+      already either running in QEMU or running on actual hardware.
+      Also, it is assumed that for deployment of the image to the
+      target, SSH is installed in the image and if the image is running
+      on real hardware that you have network access to and from your
+      development machine.
+
+   You can deploy your build output to that target hardware by using the
+   ``devtool deploy-target`` command::
+
+      $ devtool deploy-target recipe target
+
+   The target is a live target machine running as an SSH server.
+
+   You can, of course, use other methods to deploy the image you built
+   using the ``devtool build-image`` command to actual hardware.
+   ``devtool`` does not provide a specific command to deploy the image
+   to actual hardware.
+
+#. *Finish Your Work With the Recipe*: The ``devtool finish`` command
+   creates any patches corresponding to commits in the local Git
+   repository, updates the recipe to point to them (or creates a
+   ``.bbappend`` file to do so, depending on the specified destination
+   layer), and then resets the recipe so that the recipe is built
+   normally rather than from the workspace::
+
+      $ devtool finish recipe layer
+
+   .. note::
+
+      Any changes you want to turn into patches must be staged and
+      committed within the local Git repository before you use the
+      ``devtool finish`` command.
+
+   Because there is no need to move the recipe, ``devtool finish``
+   either updates the original recipe in the original layer or the
+   command creates a ``.bbappend`` file in a different layer as provided
+   by layer. Any work you did in the ``oe-local-files`` directory is
+   preserved in the original files next to the recipe during the
+   ``devtool finish`` command.
+
+   As a final process of the ``devtool finish`` command, the state of
+   the standard layers and the upstream source is restored so that you
+   can build the recipe from those areas rather than from the workspace.
+
+   .. note::
+
+      You can use the ``devtool reset`` command to put things back should you
+      decide you do not want to proceed with your work. If you do use this
+      command, realize that the source tree is preserved.
+
+``devtool ide-sdk`` configures IDEs and bootstraps SDKs
+=======================================================
+
+The ``devtool ide-sdk`` command can provide an IDE configuration for IDEs when
+working on the source code of one or more recipes.
+Depending on the programming language, and the build system used by the recipe,
+the tools required for cross-development and remote debugging are different.
+For example:
+
+-  A C/C++ project usually uses CMake or Meson.
+
+-  A Python project uses setuptools or one of its successors.
+
+-  A Rust project uses Cargo.
+
+Also, the IDE plugins needed for the integration of a build system with the
+IDE and the corresponding settings are usually specific to these build-systems.
+To hide all these details from the user, ``devtool ide-sdk`` does two things:
+
+-  It generates any kind of SDK needed for cross-development and remote
+   debugging of the specified recipes.
+
+-  It generates the configuration for the IDE (and the IDE plugins) for using
+   the cross-toolchain and remote debugging tools provided by the SDK directly
+   from the IDE.
+
+For supported build systems the configurations generated by ``devtool ide-sdk``
+combine the advantages of the ``devtool modify`` based workflow
+(see :ref:`using_devtool`) with the advantages of the simple Environment Setup
+script based workflow (see :ref:`running_the_ext_sdk_env`) provided by Yocto's
+SDK or eSDK:
+
+-  The source code of the recipe is in the workspace created by
+   ``devtool modify`` or ``devtool add``.
+   Using ``devtool build``, ``devtool build-image``,
+   ``devtool deploy-target`` or ``bitbake`` is possible.
+   Also ``devtool ide-sdk`` can be used to update the SDK and the IDE
+   configuration at any time.
+
+-  ``devtool ide-sdk`` aims to support multiple programming languages and
+   multiple IDEs natively. "Natively" means that the IDE is configured to call
+   the build tool (e.g. ``cmake`` or ``meson``) directly. This has several
+   advantages.
+   First of all, it is usually much faster to call for example ``cmake`` than
+   ``devtool build``.
+   It also allows to benefit from the very good integration that IDEs like
+   VSCode offer for tools like CMake or GDB.
+
+   However, supporting many programming languages and multiple
+   IDEs is quite an elaborate and constantly evolving thing. Support for IDEs
+   is therefore implemented as plugins. Plugins can also be provided by
+   optional layers.
+
+So much about the introduction to the default mode of ``devtool sdk-ide`` which
+is called the "modified" mode because it uses the workspace created by
+``devtool modify`` and the per recipe :term:`Sysroots <Sysroot>` of BitBake.
+
+For some recipes and use cases, this default behavior of ``devtool ide-sdk``
+with full ``devtool`` and ``bitbake`` integration might not be suitable.
+To offer full feature parity with the SDK and the eSDK, ``devtool ide-sdk`` has
+a second mode called "shared" mode.
+If ``devtool ide-sdk`` is called with the ``--mode=shared`` option, it
+bootstraps an SDK directly from the BitBake environment, which offers the same
+Environment Setup script as described in :ref:`running_the_ext_sdk_env`.
+In addition to the (e)SDK installer-based setup, the IDE gets configured
+to use the shared :term:`Sysroots <Sysroot>` and the tools from the SDK.
+``devtool ide-sdk --mode=shared`` is basically a wrapper for the setup of the
+extensible SDK as described in :ref:`setting_up_ext_sdk_in_build`.
+
+The use of ``devtool ide-sdk`` is an alternative to using one of the SDK
+installers.
+``devtool ide-sdk`` allows the creation of SDKs that offer all the
+functionality of the SDK and the eSDK installers. Compared to the installers,
+however, the SDK created with ``devtool ide-sdk`` is much more flexible.
+For example, it is very easy to change the :term:`MACHINE` in the
+``local.conf`` file, update the layer meta data and then regenerate the SDK.
+
+Let's take a look at an example of how to use ``devtool ide-sdk`` in each of
+the two modes:
+
+#. *Modified mode*:
+
+   In order to use the ``devtool ide-sdk``, a few settings are needed. As a
+   starting example, the following lines of code can be added to the
+   ``local.conf`` file::
+
+      # Build the companion debug file system
+      IMAGE_GEN_DEBUGFS = "1"
+      # Optimize build time: with devtool ide-sdk the dbg tar is not needed
+      IMAGE_FSTYPES_DEBUGFS = ""
+      # Without copying the binaries into roofs-dbg, GDB does not find all source files.
+      IMAGE_CLASSES += "image-combined-dbg"
+
+      # SSH is mandatory, no password simplifies the usage
+      EXTRA_IMAGE_FEATURES += "\
+         ssh-server-openssh \
+         allow-empty-password \
+         allow-root-login \
+         empty-root-password \
+      "
+
+      # Remote debugging needs gdbserver on the target device
+      IMAGE_INSTALL:append = " gdbserver"
+
+      # Add the recipes which should be modified to the image
+      # Otherwise some dependencies might be missing.
+      IMAGE_INSTALL:append = " my-recipe"
+
+   Assuming the BitBake environment is set up correctly and a workspace has
+   been created for the recipe using ``devtool modify my-recipe`` or probably
+   even better by using ``devtool modify my-recipe --debug-build``, the
+   following command can create the SDK and the configuration for VSCode in
+   the recipe workspace::
+
+      $ devtool ide-sdk my-recipe core-image-minimal --target root@192.168.7.2
+
+   The command requires an image recipe (``core-image-minimal`` for this
+   example) that is used to create the SDK.
+   This firmware image should also be installed on the target device.
+   It is possible to pass multiple package recipes::
+
+      $ devtool ide-sdk my-recipe-1 my-recipe-2 core-image-minimal --target root@192.168.7.2
+
+   ``devtool ide-sdk`` tries to create an IDE configuration for all package
+   recipes.
+
+   What this command does exactly depends on the recipe, more precisely on the
+   build tool used by the recipe. The basic idea is to configure the IDE so
+   that it calls the build tool exactly as ``bitbake`` does.
+
+   For example, a CMake preset is created for a recipe that inherits
+   :ref:`ref-classes-cmake`. In the case of VSCode, CMake presets are supported
+   by the CMake Tools plugin. This is an example of how the build configuration
+   used by ``bitbake`` is exported to an IDE configuration that gives exactly
+   the same build results.
+
+   Support for remote debugging with seamless integration into the IDE is
+   important for a cross-SDK. ``devtool ide-sdk`` automatically generates the
+   necessary helper scripts for deploying the compiled artifacts to the target
+   device as well as the necessary configuration for the debugger and the IDE.
+
+   .. note::
+
+      To ensure that the debug symbols on the build machine match the binaries
+      running on the target device, it is essential that the image built by
+      ``devtool ide-sdk`` is running on the target device.
+
+   The default IDE is VSCode. Some hints about using VSCode:
+
+   -  VSCode can be used to work on the BitBake recipes or the application
+      source code.
+      Usually there is one instance of VSCode running in the folder where the
+      BitBake recipes are. This instance has the
+      `Yocto Project BitBake plugin <https://marketplace.visualstudio.com/items?itemName=yocto-project.yocto-bitbake>`_
+      running.
+
+      .. warning::
+
+         Some VSCode plugins (Python, BitBake and others) need a reasonable
+         configuration to work as expected. Otherwise, some plugins try to
+         index the build directory of BitBake, which keeps your system quite
+         busy until an out of memory exception stops this nonsense.
+         Other plugins, such as the BitBake plugin, do not behave as expected.
+
+         To work around such issues, the ``oe-init-build-env`` script creates
+         an initial ``.vscode/settings.json`` file if ``code`` can be found
+         and the ``.vscode`` folder does not yet exist.
+         It is best to run ``oe-init-build-env`` once before starting VSCode.
+         An alternative approach is to use a build folder outside the layers,
+         e.g. ``oe-init-build-env ../build``.
+
+      The BitBake plugin also offers to create devtool workspaces and run
+      ``devtool ide-sdk`` with a few mouse clicks.
+      Of course, issuing commands in the terminal works as well.
+
+   -  To work on the source code of a recipe another instance of VSCode is
+      started in the recipe's workspace. Example::
+
+         code build/workspace/sources/my-recipe
+
+      This instance of VSCode uses plugins that are useful for the development
+      of the application. ``devtool ide-sdk`` generates the necessary
+      ``extensions.json``, ``settings.json``, ``tasks.json``and ``launch.json``
+      configuration files for all the involved plugins.
+
+      When the source code folder present in the workspace folder is opened in
+      VSCode for the first time, a pop-up message recommends installing the
+      required plugins.
+      After accepting the installation of the plugins, working with the source
+      code or some debugging tasks should work as usual with VSCode.
+
+      Starting the VSCode instances in the recipe workspace folders can also be
+      done by a mouse click on the recipe workspaces in the first VSCode
+      instance.
+
+   -  To work with CMake press ``Ctrl + Shift + p``, type ``cmake``. This will
+      show some possible commands like selecting a CMake preset, compiling or
+      running CTest.
+
+      For recipes inheriting :ref:`ref-classes-cmake-qemu` rather than
+      :ref:`ref-classes-cmake`, executing cross-compiled unit tests on the host
+      can be supported transparently with QEMU user-mode.
+
+   -  To work with Meson press ``Ctrl + Shift + p``, type ``meson``. This will
+      show some possible commands like compiling or executing the unit tests.
+
+      A note on running cross-compiled unit tests on the host: Meson enables
+      support for QEMU user mode by default. It is expected that the execution
+      of the unit tests from the IDE will work without any additional steps,
+      given that the code is suitable for the execution on the host machine.
+
+   -  For the deployment to the target device, just press ``Ctrl + Shift + p``,
+      type ``task``.  Select ``install && deploy-target``.
+
+   -  For remote debugging, switch to the debugging view by pressing the "play"
+      button with the ``bug icon`` on the left side. This will provide a green
+      play button with a drop-down list where a debug configuration can be
+      selected.  After selecting one of the generated configurations, press the
+      "play" button.
+
+      Starting a remote debugging session automatically initiates the
+      deployment to the target device. If this is not desired, the
+      ``"dependsOn": ["install && deploy-target...]`` parameter of the tasks
+      with ``"label": "gdbserver start...`` can be removed from the
+      ``tasks.json`` file.
+
+      VSCode supports GDB with many different setups and configurations for
+      many different use cases.  However, most of these setups have some
+      limitations when it comes to cross-development, support only a few target
+      architectures or require a high performance target device. Therefore
+      ``devtool ide-sdk`` supports the classic, generic setup with GDB on the
+      development host and gdbserver on the target device.
+
+      Roughly summarized, this means:
+
+      -  The binaries are copied via SSH to the remote target device by a
+         script referred by ``tasks.json``.
+
+      -  gdbserver is started on the remote target device via SSH by a script
+         referred by ``tasks.json``.
+
+         Changing the parameters that are passed to the debugging executable
+         requires modifying the generated script. The script is located at
+         ``oe-scripts/gdbserver_*``. Defining the parameters in the ``args``
+         field in the ``launch.json`` file does not work.
+
+      -  VSCode connects to gdbserver as documented in
+         `Remote debugging or debugging with a local debugger server
+         <https://code.visualstudio.com/docs/cpp/launch-json-reference#_remote-debugging-or-debugging-with-a-local-debugger-server>`__.
+
+   Additionally ``--ide=none`` is supported. With the ``none`` IDE parameter,
+   some generic configuration files like ``gdbinit`` files and some helper
+   scripts starting gdbserver remotely on the target device as well as the GDB
+   client on the host are generated.
+
+   Here is a usage example for the ``cmake-example`` recipe from the
+   ``meta-selftest`` layer which inherits :ref:`ref-classes-cmake-qemu`:
+
+   .. code-block:: sh
+
+      # Create the SDK
+      devtool modify cmake-example --debug-build
+      devtool ide-sdk cmake-example core-image-minimal -c --ide=none
+
+      # Install the firmware on a target device or start QEMU
+      runqemu
+
+      # From exploring the workspace of cmake-example
+      cd build/workspace/sources/cmake-example
+
+      # Find cmake-native and save the path into a variable
+      # Note: using just cmake instead of $CMAKE_NATIVE would work in many cases
+      CMAKE_NATIVE="$(jq -r '.configurePresets[0] | "\(.cmakeExecutable)"' CMakeUserPresets.json)"
+
+      # List available CMake presets
+      "$CMAKE_NATIVE" --list-presets
+      Available configure presets:
+
+        "cmake-example-cortexa57" - cmake-example: cortexa57
+
+      # Re-compile the already compiled sources
+      "$CMAKE_NATIVE" --build --preset cmake-example-cortexa57
+      ninja: no work to do.
+      # Do a clean re-build
+      "$CMAKE_NATIVE" --build --preset cmake-example-cortexa57 --target clean
+      [1/1] Cleaning all built files...
+      Cleaning... 8 files.
+      "$CMAKE_NATIVE" --build --preset cmake-example-cortexa57 --target all
+      [7/7] Linking CXX executable cmake-example
+
+      # Run the cross-compiled unit tests with QEMU user-mode
+      "$CMAKE_NATIVE" --build --preset cmake-example-cortexa57 --target test
+      [0/1] Running tests...
+      Test project .../build/tmp/work/cortexa57-poky-linux/cmake-example/1.0/cmake-example-1.0
+          Start 1: test-cmake-example
+      1/1 Test #1: test-cmake-example ...............   Passed    0.03 sec
+
+      100% tests passed, 0 tests failed out of 1
+
+      Total Test time (real) =   0.03 sec
+
+      # Using CTest directly is possible as well
+      CTEST_NATIVE="$(dirname "$CMAKE_NATIVE")/ctest"
+
+      # List available CMake presets
+      "$CTEST_NATIVE" --list-presets
+      Available test presets:
+
+        "cmake-example-cortexa57" - cmake-example: cortexa57
+
+      # Run the cross-compiled unit tests with QEMU user-mode
+      "$CTEST_NATIVE" --preset "cmake-example-cortexa57"
+      Test project ...build/tmp/work/cortexa57-poky-linux/cmake-example/1.0/cmake-example-1.0
+          Start 1: test-cmake-example
+      1/1 Test #1: test-cmake-example ...............   Passed    0.03 sec
+
+      100% tests passed, 0 tests failed out of 1
+
+      Total Test time (real) =   0.03 sec
+
+      # Deploying the new build to the target device (default is QEUM at 192.168.7.2)
+      oe-scripts/install_and_deploy_cmake-example-cortexa57
+
+      # Start a remote debugging session with gdbserver on the target and GDB on the host
+      oe-scripts/gdbserver_1234_usr-bin-cmake-example_m
+      oe-scripts/gdb_1234_usr-bin-cmake-example
+      break main
+      run
+      step
+      stepi
+      continue
+      quit
+
+      # Stop gdbserver on the target device
+      oe-scripts/gdbserver_1234_usr-bin-cmake-example_m stop
+
+#. *Shared sysroots mode*
+
+   Creating an SDK with shared :term:`Sysroots <Sysroot>` that contains all the
+   dependencies needed to work with ``my-recipe`` is possible with the following
+   example command::
+
+      $ devtool ide-sdk --mode=shared my-recipe
+
+   For VSCode the cross-toolchain is exposed as a CMake kit. CMake kits are
+   defined in ``~/.local/share/CMakeTools/cmake-tools-kits.json``.
+   The following example shows how the cross-toolchain can be selected in
+   VSCode. First of all we need a folder containing a CMake project.
+   For this example, let's create a CMake project and start VSCode::
+
+      mkdir kit-test
+      echo "project(foo VERSION 1.0)" > kit-test/CMakeLists.txt
+      code kit-test
+
+   If there is a CMake project in the workspace, cross-compilation is
+   supported:
+
+   - Press ``Ctrl + Shift + P``, type ``CMake: Scan for Kits``
+   - Press ``Ctrl + Shift + P``, type ``CMake: Select a Kit``
+
+   Finally most of the features provided by CMake and the IDE should be
+   available.
+
+   Other IDEs than VSCode are supported as well. However,
+   ``devtool ide-sdk --mode=shared --ide=none my-recipe`` is currently
+   just a simple wrapper for the setup of the extensible SDK, as described in
+   :ref:`setting_up_ext_sdk_in_build`.
+
+Use ``devtool upgrade`` to Create a Version of the Recipe that Supports a Newer Version of the Software
+=======================================================================================================
+
+The ``devtool upgrade`` command upgrades an existing recipe to that of a
+more up-to-date version found upstream. Throughout the life of software,
+recipes continually undergo version upgrades by their upstream
+publishers. You can use the ``devtool upgrade`` workflow to make sure
+your recipes you are using for builds are up-to-date with their upstream
+counterparts.
+
+.. note::
+
+   Several methods exist by which you can upgrade recipes ---
+   ``devtool upgrade`` happens to be one. You can read about all the methods by
+   which you can upgrade recipes in the
+   :ref:`dev-manual/upgrading-recipes:upgrading recipes` section of the Yocto
+   Project Development Tasks Manual.
+
+The ``devtool upgrade`` command is flexible enough to allow you to specify
+source code revision and versioning schemes, extract code into or out of the
+``devtool`` :ref:`devtool-the-workspace-layer-structure`, and work with any
+source file forms that the
+:ref:`bitbake-user-manual/bitbake-user-manual-fetching:fetchers` support.
+
+The following diagram shows the common development flow used with the
+``devtool upgrade`` command:
+
+.. image:: figures/devtool-upgrade-flow.png
+   :width: 100%
+
+#. *Initiate the Upgrade*: The top part of the flow shows the typical
+   scenario by which you use the ``devtool upgrade`` command. The
+   following conditions exist:
+
+   -  The recipe exists in a local layer external to the ``devtool``
+      workspace.
+
+   -  The source files for the new release exist in the same location
+      pointed to by :term:`SRC_URI`
+      in the recipe (e.g. a tarball with the new version number in the
+      name, or as a different revision in the upstream Git repository).
+
+   A common situation is where third-party software has undergone a
+   revision so that it has been upgraded. The recipe you have access to
+   is likely in your own layer. Thus, you need to upgrade the recipe to
+   use the newer version of the software::
+
+      $ devtool upgrade -V version recipe
+
+   By default, the ``devtool upgrade`` command extracts source
+   code into the ``sources`` directory in the
+   :ref:`devtool-the-workspace-layer-structure`.
+   If you want the code extracted to any other location, you need to
+   provide the ``srctree`` positional argument with the command as follows::
+
+      $ devtool upgrade -V version recipe srctree
+
+   .. note::
+
+      In this example, the "-V" option specifies the new version. If you
+      don't use "-V", the command upgrades the recipe to the latest
+      version.
+
+   If the source files pointed to by the :term:`SRC_URI` statement in the
+   recipe are in a Git repository, you must provide the "-S" option and
+   specify a revision for the software.
+
+   Once ``devtool`` locates the recipe, it uses the :term:`SRC_URI` variable
+   to locate the source code and any local patch files from other
+   developers. The result is that the command sets up the source code,
+   the new version of the recipe, and an append file all within the
+   workspace.
+
+   Additionally, if you have any non-patch local files (i.e. files
+   referred to with ``file://`` entries in :term:`SRC_URI` statement
+   excluding ``*.patch/`` or ``*.diff``), these files are copied to an
+   ``oe-local-files`` folder under the newly created source tree.
+   Copying the files here gives you a convenient area from which you can
+   modify the files. Any changes or additions you make to those files
+   are incorporated into the build the next time you build the software
+   just as are other changes you might have made to the source.
+
+#. *Resolve any Conflicts created by the Upgrade*: Conflicts could happen
+   after upgrading the software to a new version. Conflicts occur
+   if your recipe specifies some patch files in :term:`SRC_URI` that
+   conflict with changes made in the new version of the software. For
+   such cases, you need to resolve the conflicts by editing the source
+   and following the normal ``git rebase`` conflict resolution process.
+
+   Before moving onto the next step, be sure to resolve any such
+   conflicts created through use of a newer or different version of the
+   software.
+
+#. *Build the Recipe or Rebuild the Image*: The next step you take
+   depends on what you are going to do with the new code.
+
+   If you need to eventually move the build output to the target
+   hardware, use the following ``devtool`` command::
+
+      $ devtool build recipe
+
+   On the other hand, if you want an image to contain the recipe's
+   packages from the workspace for immediate deployment onto a device
+   (e.g. for testing purposes), you can use the ``devtool build-image``
+   command::
+
+      $ devtool build-image image
+
+#. *Deploy the Build Output*: When you use the ``devtool build`` command
+   or ``bitbake`` to build your recipe, you probably want to see if the
+   resulting build output works as expected on target hardware.
+
+   .. note::
+
+      This step assumes you have a previously built image that is
+      already either running in QEMU or running on actual hardware.
+      Also, it is assumed that for deployment of the image to the
+      target, SSH is installed in the image and if the image is running
+      on real hardware that you have network access to and from your
+      development machine.
+
+   You can deploy your build output to that target hardware by using the
+   ``devtool deploy-target`` command::
+
+      $ devtool deploy-target recipe target
+
+   The target is a live target machine running as an SSH server.
+
+   You can, of course, also deploy the image you build using the
+   ``devtool build-image`` command to actual hardware. However,
+   ``devtool`` does not provide a specific command that allows you to do
+   this.
+
+#. *Finish Your Work With the Recipe*: The ``devtool finish`` command
+   creates any patches corresponding to commits in the local Git
+   repository, moves the new recipe to a more permanent layer, and then
+   resets the recipe so that the recipe is built normally rather than
+   from the workspace.
+
+   Any work you did in the ``oe-local-files`` directory is preserved in
+   the original files next to the recipe during the ``devtool finish``
+   command.
+
+   If you specify a destination layer that is the same as the original
+   source, then the old version of the recipe and associated files are
+   removed prior to adding the new version::
+
+      $ devtool finish recipe layer
+
+   .. note::
+
+      Any changes you want to turn into patches must be committed to the
+      Git repository in the source tree.
+
+   As a final process of the ``devtool finish`` command, the state of
+   the standard layers and the upstream source is restored so that you
+   can build the recipe from those areas rather than the workspace.
+
+   .. note::
+
+      You can use the ``devtool reset`` command to put things back should you
+      decide you do not want to proceed with your work. If you do use this
+      command, realize that the source tree is preserved.
+
+A Closer Look at ``devtool add``
+================================
+
+The ``devtool add`` command automatically creates a recipe based on the
+source tree you provide with the command. Currently, the command has
+support for the following:
+
+-  Autotools (``autoconf`` and ``automake``)
+
+-  CMake
+
+-  Scons
+
+-  ``qmake``
+
+-  Plain ``Makefile``
+
+-  Out-of-tree kernel module
+
+-  Binary package (i.e. "-b" option)
+
+-  Node.js module
+
+-  Python modules that use ``setuptools`` or ``distutils``
+
+Apart from binary packages, the determination of how a source tree
+should be treated is automatic based on the files present within that
+source tree. For example, if a ``CMakeLists.txt`` file is found, then
+the source tree is assumed to be using CMake and is treated accordingly.
+
+.. note::
+
+   In most cases, you need to edit the automatically generated recipe in
+   order to make it build properly. Typically, you would go through
+   several edit and build cycles until the recipe successfully builds.
+   Once the recipe builds, you could use possible further iterations to
+   test the recipe on the target device.
+
+The remainder of this section covers specifics regarding how parts of
+the recipe are generated.
+
+Name and Version
+----------------
+
+If you do not specify a name and version on the command line,
+``devtool add`` uses various metadata within the source tree in an
+attempt to determine the name and version of the software being built.
+Based on what the tool determines, ``devtool`` sets the name of the
+created recipe file accordingly.
+
+If ``devtool`` cannot determine the name and version, the command prints
+an error. For such cases, you must re-run the command and provide the
+name and version, just the name, or just the version as part of the
+command line.
+
+Sometimes the name or version determined from the source tree might be
+incorrect. For such a case, you must reset the recipe::
+
+   $ devtool reset -n recipename
+
+After running the ``devtool reset`` command, you need to
+run ``devtool add`` again and provide the name or the version.
+
+Dependency Detection and Mapping
+--------------------------------
+
+The ``devtool add`` command attempts to detect build-time dependencies and map
+them to other recipes in the system. During this mapping, the command fills in
+the names of those recipes as part of the :term:`DEPENDS` variable within the
+recipe. If a dependency cannot be mapped, ``devtool`` places a comment
+in the recipe indicating such. The inability to map a dependency can
+result from naming not being recognized or because the dependency simply
+is not available. For cases where the dependency is not available, you
+must use the ``devtool add`` command to add an additional recipe that
+satisfies the dependency. Once you add that recipe, you need to update
+the :term:`DEPENDS` variable in the original recipe to include the new
+recipe.
+
+If you need to add runtime dependencies, you can do so by adding the
+following to your recipe::
+
+   RDEPENDS:${PN} += "dependency1 dependency2 ..."
+
+.. note::
+
+   The ``devtool add`` command often cannot distinguish between mandatory and
+   optional dependencies. Consequently, some of the detected dependencies might
+   in fact be optional. When in doubt, consult the documentation or the
+   configure script for the software the recipe is building for further
+   details. In some cases, you might find you can substitute the
+   dependency with an option that disables the associated functionality
+   passed to the configure script.
+
+License Detection
+-----------------
+
+The ``devtool add`` command attempts to determine if the software you are
+adding is able to be distributed under a common, open-source license. If
+so, the command sets the :term:`LICENSE` value accordingly.
+You should double-check the value added by the command against the
+documentation or source files for the software you are building and, if
+necessary, update that :term:`LICENSE` value.
+
+The ``devtool add`` command also sets the :term:`LIC_FILES_CHKSUM`
+value to point to all files that appear to be license-related. Realize
+that license statements often appear in comments at the top of source
+files or within the documentation. In such cases, the command does not
+recognize those license statements. Consequently, you might need to
+amend the :term:`LIC_FILES_CHKSUM` variable to point to one or more of those
+comments if present. Setting :term:`LIC_FILES_CHKSUM` is particularly
+important for third-party software. The mechanism attempts to ensure
+correct licensing should you upgrade the recipe to a newer upstream
+version in future. Any change in licensing is detected and you receive
+an error prompting you to check the license text again.
+
+If the ``devtool add`` command cannot determine licensing information,
+``devtool`` sets the :term:`LICENSE` value to "CLOSED" and leaves the
+:term:`LIC_FILES_CHKSUM` value unset. This behavior allows you to continue
+with development even though the settings are unlikely to be correct in
+all cases. You should check the documentation or source files for the
+software you are building to determine the actual license.
+
+Adding Makefile-Only Software
+-----------------------------
+
+The use of Make by itself is very common in both proprietary and
+open-source software. Unfortunately, Makefiles are often not written
+with cross-compilation in mind. Thus, ``devtool add`` often cannot do
+very much to ensure that these Makefiles build correctly. It is very
+common, for example, to explicitly call ``gcc`` instead of using the
+:term:`CC` variable. Usually, in a
+cross-compilation environment, ``gcc`` is the compiler for the build
+host and the cross-compiler is named something similar to
+``arm-poky-linux-gnueabi-gcc`` and might require arguments (e.g. to
+point to the associated sysroot for the target machine).
+
+When writing a recipe for Makefile-only software, keep the following in
+mind:
+
+-  You probably need to patch the Makefile to use variables instead of
+   hardcoding tools within the toolchain such as ``gcc`` and ``g++``.
+
+-  The environment in which Make runs is set up with various standard
+   variables for compilation (e.g. :term:`CC`, :term:`CXX`, and so forth) in a
+   similar manner to the environment set up by the SDK's environment
+   setup script. One easy way to see these variables is to run the
+   ``devtool build`` command on the recipe and then look in
+   ``oe-logs/run.do_compile``. Towards the top of this file, there is
+   a list of environment variables that are set. You can take
+   advantage of these variables within the Makefile.
+
+-  If the Makefile sets a default for a variable using "=", that default
+   overrides the value set in the environment, which is usually not
+   desirable. For this case, you can either patch the Makefile so it
+   sets the default using the "?=" operator, or you can alternatively
+   force the value on the ``make`` command line. To force the value on
+   the command line, add the variable setting to
+   :term:`EXTRA_OEMAKE` or
+   :term:`PACKAGECONFIG_CONFARGS`
+   within the recipe. Here is an example using :term:`EXTRA_OEMAKE`::
+
+      EXTRA_OEMAKE += "'CC=${CC}' 'CXX=${CXX}'"
+
+   In the above example,
+   single quotes are used around the variable settings as the values are
+   likely to contain spaces because required default options are passed
+   to the compiler.
+
+-  Hardcoding paths inside Makefiles is often problematic in a
+   cross-compilation environment. This is particularly true because
+   those hardcoded paths often point to locations on the build host and
+   thus will either be read-only or will introduce contamination into
+   the cross-compilation because they are specific to the build host
+   rather than the target. Patching the Makefile to use prefix variables
+   or other path variables is usually the way to handle this situation.
+
+-  Sometimes a Makefile runs target-specific commands such as
+   ``ldconfig``. For such cases, you might be able to apply patches that
+   remove these commands from the Makefile.
+
+Adding Native Tools
+-------------------
+
+Often, you need to build additional tools that run on the :term:`Build Host`
+as opposed to the target. You should indicate this requirement by using one of
+the following methods when you run ``devtool add``:
+
+-  Specify the name of the recipe such that it ends with "-native".
+   Specifying the name like this produces a recipe that only builds for
+   the build host.
+
+-  Specify the "--also-native" option with the ``devtool add``
+   command. Specifying this option creates a recipe file that still
+   builds for the target but also creates a variant with a "-native"
+   suffix that builds for the build host.
+
+.. note::
+
+   If you need to add a tool that is shipped as part of a source tree
+   that builds code for the target, you can typically accomplish this by
+   building the native and target parts separately rather than within
+   the same compilation process. Realize though that with the
+   "--also-native" option, you can add the tool using just one
+   recipe file.
+
+Adding Node.js Modules
+----------------------
+
+You can use the ``devtool add`` command two different ways to add
+Node.js modules: through ``npm`` or from a repository or local source.
+
+Use the following form to add Node.js modules through ``npm``::
+
+   $ devtool add "npm://registry.npmjs.org;name=forever;version=0.15.1"
+
+The name and
+version parameters are mandatory. Lockdown and shrinkwrap files are
+generated and pointed to by the recipe in order to freeze the version
+that is fetched for the dependencies according to the first time. This
+also saves checksums that are verified on future fetches. Together,
+these behaviors ensure the reproducibility and integrity of the build.
+
+.. note::
+
+   -  You must use quotes around the URL. ``devtool add`` does not
+      require the quotes, but the shell considers ";" as a splitter
+      between multiple commands. Thus, without the quotes,
+      ``devtool add`` does not receive the other parts, which results in
+      several "command not found" errors.
+
+   -  In order to support adding Node.js modules, a ``nodejs`` recipe
+      must be part of your SDK.
+
+As mentioned earlier, you can also add Node.js modules directly from a
+repository or local source tree. To add modules this way, use
+``devtool add`` in the following form::
+
+   $ devtool add https://github.com/diversario/node-ssdp
+
+In this example, ``devtool`` fetches the specified Git repository, detects the
+code as Node.js code, fetches dependencies using ``npm``, and sets
+:term:`SRC_URI` accordingly.
+
+Working With Recipes
+====================
+
+When building a recipe using the ``devtool build`` command, the typical
+build progresses as follows:
+
+#. Fetch the source
+
+#. Unpack the source
+
+#. Configure the source
+
+#. Compile the source
+
+#. Install the build output
+
+#. Package the installed output
+
+For recipes in the workspace, fetching and unpacking is disabled as the
+source tree has already been prepared and is persistent. Each of these
+build steps is defined as a function (task), usually with a "do\_" prefix
+(e.g. :ref:`ref-tasks-fetch`,
+:ref:`ref-tasks-unpack`, and so
+forth). These functions are typically shell scripts but can instead be
+written in Python.
+
+If you look at the contents of a recipe, you will see that the recipe
+does not include complete instructions for building the software.
+Instead, common functionality is encapsulated in classes inherited with
+the ``inherit`` directive. This technique leaves the recipe to describe
+just the things that are specific to the software being built. There is
+a :ref:`ref-classes-base` class that is implicitly inherited by all recipes
+and provides the functionality that most recipes typically need.
+
+The remainder of this section presents information useful when working
+with recipes.
+
+Finding Logs and Work Files
+---------------------------
+
+After the first run of the ``devtool build`` command, recipes that were
+previously created using the ``devtool add`` command or whose sources
+were modified using the ``devtool modify`` command contain symbolic
+links created within the source tree:
+
+-  ``oe-logs``: This link points to the directory in which log files and
+   run scripts for each build step are created.
+
+-  ``oe-workdir``: This link points to the temporary work area for the
+   recipe. The following locations under ``oe-workdir`` are particularly
+   useful:
+
+   -  ``image/``: Contains all of the files installed during the
+      :ref:`ref-tasks-install` stage.
+      Within a recipe, this directory is referred to by the expression
+      ``${``\ :term:`D`\ ``}``.
+
+   -  ``sysroot-destdir/``: Contains a subset of files installed within
+      :ref:`ref-tasks-install` that have been put into the shared sysroot. For
+      more information, see the
+      ":ref:`dev-manual/new-recipe:sharing files between recipes`" section.
+
+   -  ``packages-split/``: Contains subdirectories for each package
+      produced by the recipe. For more information, see the
+      ":ref:`dev-manual/devtool:packaging`" section.
+
+You can use these links to get more information on what is happening at
+each build step.
+
+Setting Configure Arguments
+---------------------------
+
+If the software your recipe is building uses GNU autoconf, then a fixed
+set of arguments is passed to it to enable cross-compilation plus any
+extras specified by :term:`EXTRA_OECONF` or :term:`PACKAGECONFIG_CONFARGS`
+set within the recipe. If you wish to pass additional options, add them
+to :term:`EXTRA_OECONF` or :term:`PACKAGECONFIG_CONFARGS`. Other supported build
+tools have similar variables (e.g.  :term:`EXTRA_OECMAKE` for CMake,
+:term:`EXTRA_OESCONS` for Scons, and so forth). If you need to pass anything on
+the ``make`` command line, you can use :term:`EXTRA_OEMAKE` or the
+:term:`PACKAGECONFIG_CONFARGS` variables to do so.
+
+You can use the ``devtool configure-help`` command to help you set the
+arguments listed in the previous paragraph. The command determines the
+exact options being passed, and shows them to you along with any custom
+arguments specified through :term:`EXTRA_OECONF` or
+:term:`PACKAGECONFIG_CONFARGS`. If applicable, the command also shows you
+the output of the configure script's "--help" option as a
+reference.
+
+Sharing Files Between Recipes
+-----------------------------
+
+Recipes often need to use files provided by other recipes on the
+:term:`Build Host`. For example,
+an application linking to a common library needs access to the library
+itself and its associated headers. The way this access is accomplished
+within the extensible SDK is through the sysroot. There is one sysroot per
+"machine" for which the SDK is being built. In practical terms, this
+means there is a sysroot for the target machine, and a sysroot for
+the build host.
+
+Recipes should never write files directly into the sysroot. Instead,
+files should be installed into standard locations during the
+:ref:`ref-tasks-install` task within the ``${``\ :term:`D`\ ``}`` directory. A
+subset of these files automatically goes into the sysroot. The reason
+for this limitation is that almost all files that go into the sysroot
+are cataloged in manifests in order to ensure they can be removed later
+when a recipe is modified or removed. Thus, the sysroot is able to
+remain free from stale files.
+
+Packaging
+---------
+
+Packaging is not always particularly relevant within the extensible SDK.
+However, if you examine how build output gets into the final image on
+the target device, it is important to understand packaging because the
+contents of the image are expressed in terms of packages and not
+recipes.
+
+During the :ref:`ref-tasks-package` task, files installed during the
+:ref:`ref-tasks-install` task are split into one main package, which is almost
+always named the same as the recipe, and into several other packages. This
+separation exists because not all of those installed files are useful in every
+image. For example, you probably do not need any of the documentation installed
+in a production image. Consequently, for each recipe the documentation
+files are separated into a ``-doc`` package. Recipes that package
+software containing optional modules or plugins might undergo additional
+package splitting as well.
+
+After building a recipe, you can see where files have gone by looking in
+the ``oe-workdir/packages-split`` directory, which contains a
+subdirectory for each package. Apart from some advanced cases, the
+:term:`PACKAGES` and :term:`FILES` variables controls
+splitting. The :term:`PACKAGES` variable lists all of the packages to be
+produced, while the :term:`FILES` variable specifies which files to include
+in each package by using an override to specify the package. For
+example, ``FILES:${PN}`` specifies the files to go into the main package
+(i.e. the main package has the same name as the recipe and
+``${``\ :term:`PN`\ ``}`` evaluates to the
+recipe name). The order of the :term:`PACKAGES` value is significant. For
+each installed file, the first package whose :term:`FILES` value matches the
+file is the package into which the file goes. Both the :term:`PACKAGES` and
+:term:`FILES` variables have default values. Consequently, you might find
+you do not even need to set these variables in your recipe unless the
+software the recipe is building installs files into non-standard
+locations.
+
+Restoring the Target Device to its Original State
+=================================================
+
+If you use the ``devtool deploy-target`` command to write a recipe's
+build output to the target, and you are working on an existing component
+of the system, then you might find yourself in a situation where you
+need to restore the original files that existed prior to running the
+``devtool deploy-target`` command. Because the ``devtool deploy-target``
+command backs up any files it overwrites, you can use the
+``devtool undeploy-target`` command to restore those files and remove
+any other files the recipe deployed. Consider the following example::
+
+   $ devtool undeploy-target lighttpd root@192.168.7.2
+
+If you have deployed
+multiple applications, you can remove them all using the "-a" option
+thus restoring the target device to its original state::
+
+   $ devtool undeploy-target -a root@192.168.7.2
+
+Information about files deployed to
+the target as well as any backed up files are stored on the target
+itself. This storage, of course, requires some additional space on the
+target machine.
+
+.. note::
+
+   The ``devtool deploy-target`` and ``devtool undeploy-target`` commands do
+   not currently interact with any package management system on the target
+   device (e.g. RPM or OPKG). Consequently, you should not intermingle
+   ``devtool deploy-target`` and package manager operations on the target
+   device. Doing so could result in a conflicting set of files.
diff --git a/documentation/sdk-manual/figures/sdk-devtool-add-flow.png b/documentation/dev-manual/figures/devtool-add-flow.png
index e7d6173d2d..e7d6173d2d 100644
--- a/documentation/sdk-manual/figures/sdk-devtool-add-flow.png
+++ b/documentation/dev-manual/figures/devtool-add-flow.png
diff --git a/documentation/sdk-manual/figures/sdk-devtool-modify-flow.png b/documentation/dev-manual/figures/devtool-modify-flow.png
index 18ba8b7e65..18ba8b7e65 100644
--- a/documentation/sdk-manual/figures/sdk-devtool-modify-flow.png
+++ b/documentation/dev-manual/figures/devtool-modify-flow.png
diff --git a/documentation/sdk-manual/figures/sdk-devtool-upgrade-flow.png b/documentation/dev-manual/figures/devtool-upgrade-flow.png
index 7d4f395e24..7d4f395e24 100644
--- a/documentation/sdk-manual/figures/sdk-devtool-upgrade-flow.png
+++ b/documentation/dev-manual/figures/devtool-upgrade-flow.png
diff --git a/documentation/dev-manual/index.rst b/documentation/dev-manual/index.rst
index 8243c0f4cb..760108f605 100644
--- a/documentation/dev-manual/index.rst
+++ b/documentation/dev-manual/index.rst
@@ -23,6 +23,7 @@ Yocto Project Development Tasks Manual
    speeding-up-build
    libraries
    prebuilt-libraries
+   devtool
    x32-psabi
    gobject-introspection
    external-toolchain
diff --git a/documentation/dev-manual/new-recipe.rst b/documentation/dev-manual/new-recipe.rst
index 944b9627f9..4a65d70243 100644
--- a/documentation/dev-manual/new-recipe.rst
+++ b/documentation/dev-manual/new-recipe.rst
@@ -56,7 +56,7 @@ necessary when adding a recipe to build a new piece of software to be
 included in a build.
 
 You can find a complete description of the ``devtool add`` command in
-the ":ref:`sdk-manual/extensible:a closer look at \`\`devtool add\`\``" section
+the ":ref:`dev-manual/devtool:a closer look at \`\`devtool add\`\``" section
 in the Yocto Project Application Development and the Extensible Software
 Development Kit (eSDK) manual.
 
diff --git a/documentation/dev-manual/upgrading-recipes.rst b/documentation/dev-manual/upgrading-recipes.rst
index 4fac78bdfb..35901a0ea8 100644
--- a/documentation/dev-manual/upgrading-recipes.rst
+++ b/documentation/dev-manual/upgrading-recipes.rst
@@ -203,7 +203,7 @@ As mentioned earlier, an alternative method for upgrading recipes to
 newer versions is to use
 :doc:`devtool upgrade </ref-manual/devtool-reference>`.
 You can read about ``devtool upgrade`` in general in the
-":ref:`sdk-manual/extensible:use \`\`devtool upgrade\`\` to create a version of the recipe that supports a newer version of the software`"
+":ref:`dev-manual/devtool:use \`\`devtool upgrade\`\` to create a version of the recipe that supports a newer version of the software`"
 section in the Yocto Project Application Development and the Extensible
 Software Development Kit (eSDK) Manual.
 
diff --git a/documentation/migration-guides/migration-2.1.rst b/documentation/migration-guides/migration-2.1.rst
index 18b05b52cc..4d7aa15af5 100644
--- a/documentation/migration-guides/migration-2.1.rst
+++ b/documentation/migration-guides/migration-2.1.rst
@@ -382,7 +382,7 @@ These additional changes exist:
    removed at runtime).
 
 -  The
-   :ref:`devtool modify <sdk-manual/extensible:use \`\`devtool modify\`\` to modify the source of an existing component>`
+   :ref:`devtool modify <dev-manual/devtool:use \`\`devtool modify\`\` to modify the source of an existing component>`
    command now defaults to extracting the source since that is most
    commonly expected. The ``-x`` or ``--extract`` options are now no-ops. If
    you wish to provide your own existing source tree, you will now need
diff --git a/documentation/overview-manual/concepts.rst b/documentation/overview-manual/concepts.rst
index 70766559f8..d1fd6befc8 100644
--- a/documentation/overview-manual/concepts.rst
+++ b/documentation/overview-manual/concepts.rst
@@ -792,7 +792,7 @@ processes patches, see the
 ":ref:`dev-manual/new-recipe:patching code`"
 section in the
 Yocto Project Development Tasks Manual. You can also see the
-":ref:`sdk-manual/extensible:use \`\`devtool modify\`\` to modify the source of an existing component`"
+":ref:`dev-manual/devtool:use \`\`devtool modify\`\` to modify the source of an existing component`"
 section in the Yocto Project Application Development and the Extensible
 Software Development Kit (SDK) manual and the
 ":ref:`kernel-dev/common:using traditional kernel development to patch the kernel`"
diff --git a/documentation/ref-manual/devtool-reference.rst b/documentation/ref-manual/devtool-reference.rst
index a6ea00c210..e173720e1a 100644
--- a/documentation/ref-manual/devtool-reference.rst
+++ b/documentation/ref-manual/devtool-reference.rst
@@ -432,7 +432,7 @@ revision to which you want to upgrade (i.e. the
 forth.
 
 You can read more on the ``devtool upgrade`` workflow in the
-":ref:`sdk-manual/extensible:use \`\`devtool upgrade\`\` to create a version of the recipe that supports a newer version of the software`"
+":ref:`dev-manual/devtool:use \`\`devtool upgrade\`\` to create a version of the recipe that supports a newer version of the software`"
 section in the Yocto Project Application Development and the Extensible
 Software Development Kit (eSDK) manual. You can also see an example of
 how to use ``devtool upgrade`` in the ":ref:`dev-manual/upgrading-recipes:using \`\`devtool upgrade\`\``"
diff --git a/documentation/ref-manual/variables.rst b/documentation/ref-manual/variables.rst
index 47d4e814fd..86023195d3 100644
--- a/documentation/ref-manual/variables.rst
+++ b/documentation/ref-manual/variables.rst
@@ -8642,7 +8642,7 @@ system and gives an overview of their function and contents.
 
       For information on how staging for recipe-specific sysroots occurs,
       see the :ref:`ref-tasks-populate_sysroot`
-      task, the ":ref:`sdk-manual/extensible:sharing files between recipes`"
+      task, the ":ref:`dev-manual/devtool:sharing files between recipes`"
       section in the Yocto Project Development Tasks Manual, the
       ":ref:`overview-manual/concepts:configuration, compilation, and staging`"
       section in the Yocto Project Overview and Concepts Manual, and the
diff --git a/documentation/sdk-manual/extensible.rst b/documentation/sdk-manual/extensible.rst
index 8483951bef..dcb02c4e00 100644
--- a/documentation/sdk-manual/extensible.rst
+++ b/documentation/sdk-manual/extensible.rst
@@ -257,1326 +257,9 @@ the recipe a source tree that is under your control is used in order to
 allow you to make changes to the source as desired. By default, new
 recipes and the source go into a "workspace" directory under the SDK.
 
-The remainder of this section presents the ``devtool add``,
-``devtool modify``, and ``devtool upgrade`` workflows.
-
-Use ``devtool add`` to Add an Application
------------------------------------------
-
-The ``devtool add`` command generates a new recipe based on existing
-source code. This command takes advantage of the
-:ref:`devtool-the-workspace-layer-structure`
-layer that many ``devtool`` commands use. The command is flexible enough
-to allow you to extract source code into both the workspace or a
-separate local Git repository and to use existing code that does not
-need to be extracted.
-
-Depending on your particular scenario, the arguments and options you use
-with ``devtool add`` form different combinations. The following diagram
-shows common development flows you would use with the ``devtool add``
-command:
-
-.. image:: figures/sdk-devtool-add-flow.png
-   :width: 100%
-
-#. *Generating the New Recipe*: The top part of the flow shows three
-   scenarios by which you could use ``devtool add`` to generate a recipe
-   based on existing source code.
-
-   In a shared development environment, it is typical for other
-   developers to be responsible for various areas of source code. As a
-   developer, you are probably interested in using that source code as
-   part of your development within the Yocto Project. All you need is
-   access to the code, a recipe, and a controlled area in which to do
-   your work.
-
-   Within the diagram, three possible scenarios feed into the
-   ``devtool add`` workflow:
-
-   -  *Left*: The left scenario in the figure represents a common
-      situation where the source code does not exist locally and needs
-      to be extracted. In this situation, the source code is extracted
-      to the default workspace --- you do not want the files in some
-      specific location outside of the workspace. Thus, everything you
-      need will be located in the workspace::
-
-         $ devtool add recipe fetchuri
-
-      With this command, ``devtool`` extracts the upstream
-      source files into a local Git repository within the ``sources``
-      folder. The command then creates a recipe named recipe and a
-      corresponding append file in the workspace. If you do not provide
-      recipe, the command makes an attempt to determine the recipe name.
-
-   -  *Middle*: The middle scenario in the figure also represents a
-      situation where the source code does not exist locally. In this
-      case, the code is again upstream and needs to be extracted to some
-      local area --- this time outside of the default workspace.
-
-      .. note::
-
-         If required, ``devtool`` always creates a Git repository locally
-         during the extraction.
-
-      Furthermore, the first positional argument ``srctree`` in this case
-      identifies where the ``devtool add`` command will locate the
-      extracted code outside of the workspace. You need to specify an
-      empty directory::
-
-         $ devtool add recipe srctree fetchuri
-
-      In summary, the source code is pulled from fetchuri and extracted into the
-      location defined by ``srctree`` as a local Git repository.
-
-      Within workspace, ``devtool`` creates a recipe named recipe along
-      with an associated append file.
-
-   -  *Right*: The right scenario in the figure represents a situation
-      where the ``srctree`` has been previously prepared outside of the
-      ``devtool`` workspace.
-
-      The following command provides a new recipe name and identifies
-      the existing source tree location::
-
-         $ devtool add recipe srctree
-
-      The command examines the source code and creates a recipe named
-      recipe for the code and places the recipe into the workspace.
-
-      Because the extracted source code already exists, ``devtool`` does
-      not try to relocate the source code into the workspace --- only the
-      new recipe is placed in the workspace.
-
-      Aside from a recipe folder, the command also creates an associated
-      append folder and places an initial ``*.bbappend`` file within.
-
-#. *Edit the Recipe*: You can use ``devtool edit-recipe`` to open up the
-   editor as defined by the ``$EDITOR`` environment variable and modify
-   the file::
-
-      $ devtool edit-recipe recipe
-
-   From within the editor, you can make modifications to the recipe that
-   take effect when you build it later.
-
-#. *Build the Recipe or Rebuild the Image*: The next step you take
-   depends on what you are going to do with the new code.
-
-   If you need to eventually move the build output to the target
-   hardware, use the following ``devtool`` command::
-
-      $ devtool build recipe
-
-   On the other hand, if you want an image to contain the recipe's
-   packages from the workspace for immediate deployment onto a device
-   (e.g. for testing purposes), you can use the ``devtool build-image``
-   command::
-
-      $ devtool build-image image
-
-#. *Deploy the Build Output*: When you use the ``devtool build`` command
-   to build out your recipe, you probably want to see if the resulting
-   build output works as expected on the target hardware.
-
-   .. note::
-
-      This step assumes you have a previously built image that is
-      already either running in QEMU or is running on actual hardware.
-      Also, it is assumed that for deployment of the image to the
-      target, SSH is installed in the image and, if the image is running
-      on real hardware, you have network access to and from your
-      development machine.
-
-   You can deploy your build output to that target hardware by using the
-   ``devtool deploy-target`` command::
-
-      $ devtool deploy-target recipe target
-
-   The target is a live target machine running as an SSH server.
-
-   You can, of course, also deploy the image you build to actual
-   hardware by using the ``devtool build-image`` command. However,
-   ``devtool`` does not provide a specific command that allows you to
-   deploy the image to actual hardware.
-
-#. *Finish Your Work With the Recipe*: The ``devtool finish`` command
-   creates any patches corresponding to commits in the local Git
-   repository, moves the new recipe to a more permanent layer, and then
-   resets the recipe so that the recipe is built normally rather than
-   from the workspace::
-
-      $ devtool finish recipe layer
-
-   .. note::
-
-      Any changes you want to turn into patches must be committed to the
-      Git repository in the source tree.
-
-   As mentioned, the ``devtool finish`` command moves the final recipe
-   to its permanent layer.
-
-   As a final process of the ``devtool finish`` command, the state of
-   the standard layers and the upstream source is restored so that you
-   can build the recipe from those areas rather than the workspace.
-
-   .. note::
-
-      You can use the ``devtool reset`` command to put things back should you
-      decide you do not want to proceed with your work. If you do use this
-      command, realize that the source tree is preserved.
-
-Use ``devtool modify`` to Modify the Source of an Existing Component
---------------------------------------------------------------------
-
-The ``devtool modify`` command prepares the way to work on existing code
-that already has a local recipe in place that is used to build the
-software. The command is flexible enough to allow you to extract code
-from an upstream source, specify the existing recipe, and keep track of
-and gather any patch files from other developers that are associated
-with the code.
-
-Depending on your particular scenario, the arguments and options you use
-with ``devtool modify`` form different combinations. The following
-diagram shows common development flows for the ``devtool modify``
-command:
-
-.. image:: figures/sdk-devtool-modify-flow.png
-   :width: 100%
-
-#. *Preparing to Modify the Code*: The top part of the flow shows three
-   scenarios by which you could use ``devtool modify`` to prepare to
-   work on source files. Each scenario assumes the following:
-
-   -  The recipe exists locally in a layer external to the ``devtool``
-      workspace.
-
-   -  The source files exist either upstream in an un-extracted state or
-      locally in a previously extracted state.
-
-   The typical situation is where another developer has created a layer
-   for use with the Yocto Project and their recipe already resides in
-   that layer. Furthermore, their source code is readily available
-   either upstream or locally.
-
-   -  *Left*: The left scenario in the figure represents a common
-      situation where the source code does not exist locally and it
-      needs to be extracted from an upstream source. In this situation,
-      the source is extracted into the default ``devtool`` workspace
-      location. The recipe, in this scenario, is in its own layer
-      outside the workspace (i.e. ``meta-``\ layername).
-
-      The following command identifies the recipe and, by default,
-      extracts the source files::
-
-         $ devtool modify recipe
-
-      Once ``devtool`` locates the recipe, ``devtool`` uses the recipe's
-      :term:`SRC_URI` statements to locate the source code and any local
-      patch files from other developers.
-
-      With this scenario, there is no ``srctree`` argument. Consequently, the
-      default behavior of the ``devtool modify`` command is to extract
-      the source files pointed to by the :term:`SRC_URI` statements into a
-      local Git structure. Furthermore, the location for the extracted
-      source is the default area within the ``devtool`` workspace. The
-      result is that the command sets up both the source code and an
-      append file within the workspace while the recipe remains in its
-      original location.
-
-      Additionally, if you have any non-patch local files (i.e. files
-      referred to with ``file://`` entries in :term:`SRC_URI` statement
-      excluding ``*.patch/`` or ``*.diff``), these files are copied to
-      an ``oe-local-files`` folder under the newly created source tree.
-      Copying the files here gives you a convenient area from which you
-      can modify the files. Any changes or additions you make to those
-      files are incorporated into the build the next time you build the
-      software just as are other changes you might have made to the
-      source.
-
-   -  *Middle*: The middle scenario in the figure represents a situation
-      where the source code also does not exist locally. In this case,
-      the code is again upstream and needs to be extracted to some local
-      area as a Git repository. The recipe, in this scenario, is again
-      local and in its own layer outside the workspace.
-
-      The following command tells ``devtool`` the recipe with which to
-      work and, in this case, identifies a local area for the extracted
-      source files that exists outside of the default ``devtool``
-      workspace::
-
-         $ devtool modify recipe srctree
-
-      .. note::
-
-         You cannot provide a URL for ``srctree`` using the ``devtool`` command.
-
-      As with all extractions, the command uses the recipe's :term:`SRC_URI`
-      statements to locate the source files and any associated patch
-      files. Non-patch files are copied to an ``oe-local-files`` folder
-      under the newly created source tree.
-
-      Once the files are located, the command by default extracts them
-      into ``srctree``.
-
-      Within workspace, ``devtool`` creates an append file for the
-      recipe. The recipe remains in its original location but the source
-      files are extracted to the location you provide with ``srctree``.
-
-   -  *Right*: The right scenario in the figure represents a situation
-      where the source tree (``srctree``) already exists locally as a
-      previously extracted Git structure outside of the ``devtool``
-      workspace. In this example, the recipe also exists elsewhere
-      locally in its own layer.
-
-      The following command tells ``devtool`` the recipe with which to
-      work, uses the "-n" option to indicate source does not need to be
-      extracted, and uses ``srctree`` to point to the previously extracted
-      source files::
-
-         $ devtool modify -n recipe srctree
-
-      If an ``oe-local-files`` subdirectory happens to exist and it
-      contains non-patch files, the files are used. However, if the
-      subdirectory does not exist and you run the ``devtool finish``
-      command, any non-patch files that might exist next to the recipe
-      are removed because it appears to ``devtool`` that you have
-      deleted those files.
-
-      Once the ``devtool modify`` command finishes, it creates only an
-      append file for the recipe in the ``devtool`` workspace. The
-      recipe and the source code remain in their original locations.
-
-#. *Edit the Source*: Once you have used the ``devtool modify`` command,
-   you are free to make changes to the source files. You can use any
-   editor you like to make and save your source code modifications.
-
-#. *Build the Recipe or Rebuild the Image*: The next step you take
-   depends on what you are going to do with the new code.
-
-   If you need to eventually move the build output to the target
-   hardware, use the following ``devtool`` command::
-
-      $ devtool build recipe
-
-   On the other hand, if you want an image to contain the recipe's
-   packages from the workspace for immediate deployment onto a device
-   (e.g. for testing purposes), you can use the ``devtool build-image``
-   command::
-
-      $ devtool build-image image
-
-#. *Deploy the Build Output*: When you use the ``devtool build`` command
-   to build out your recipe, you probably want to see if the resulting
-   build output works as expected on target hardware.
-
-   .. note::
-
-      This step assumes you have a previously built image that is
-      already either running in QEMU or running on actual hardware.
-      Also, it is assumed that for deployment of the image to the
-      target, SSH is installed in the image and if the image is running
-      on real hardware that you have network access to and from your
-      development machine.
-
-   You can deploy your build output to that target hardware by using the
-   ``devtool deploy-target`` command::
-
-      $ devtool deploy-target recipe target
-
-   The target is a live target machine running as an SSH server.
-
-   You can, of course, use other methods to deploy the image you built
-   using the ``devtool build-image`` command to actual hardware.
-   ``devtool`` does not provide a specific command to deploy the image
-   to actual hardware.
-
-#. *Finish Your Work With the Recipe*: The ``devtool finish`` command
-   creates any patches corresponding to commits in the local Git
-   repository, updates the recipe to point to them (or creates a
-   ``.bbappend`` file to do so, depending on the specified destination
-   layer), and then resets the recipe so that the recipe is built
-   normally rather than from the workspace::
-
-      $ devtool finish recipe layer
-
-   .. note::
-
-      Any changes you want to turn into patches must be staged and
-      committed within the local Git repository before you use the
-      ``devtool finish`` command.
-
-   Because there is no need to move the recipe, ``devtool finish``
-   either updates the original recipe in the original layer or the
-   command creates a ``.bbappend`` file in a different layer as provided
-   by layer. Any work you did in the ``oe-local-files`` directory is
-   preserved in the original files next to the recipe during the
-   ``devtool finish`` command.
-
-   As a final process of the ``devtool finish`` command, the state of
-   the standard layers and the upstream source is restored so that you
-   can build the recipe from those areas rather than from the workspace.
-
-   .. note::
-
-      You can use the ``devtool reset`` command to put things back should you
-      decide you do not want to proceed with your work. If you do use this
-      command, realize that the source tree is preserved.
-
-``devtool ide-sdk`` configures IDEs and bootstraps SDKs
--------------------------------------------------------
-
-The ``devtool ide-sdk`` command can provide an IDE configuration for IDEs when
-working on the source code of one or more recipes.
-Depending on the programming language, and the build system used by the recipe,
-the tools required for cross-development and remote debugging are different.
-For example:
-
--  A C/C++ project usually uses CMake or Meson.
-
--  A Python project uses setuptools or one of its successors.
-
--  A Rust project uses Cargo.
-
-Also, the IDE plugins needed for the integration of a build system with the
-IDE and the corresponding settings are usually specific to these build-systems.
-To hide all these details from the user, ``devtool ide-sdk`` does two things:
-
--  It generates any kind of SDK needed for cross-development and remote
-   debugging of the specified recipes.
-
--  It generates the configuration for the IDE (and the IDE plugins) for using
-   the cross-toolchain and remote debugging tools provided by the SDK directly
-   from the IDE.
-
-For supported build systems the configurations generated by ``devtool ide-sdk``
-combine the advantages of the ``devtool modify`` based workflow
-(see :ref:`using_devtool`) with the advantages of the simple Environment Setup
-script based workflow (see :ref:`running_the_ext_sdk_env`) provided by Yocto's
-SDK or eSDK:
-
--  The source code of the recipe is in the workspace created by
-   ``devtool modify`` or ``devtool add``.
-   Using ``devtool build``, ``devtool build-image``,
-   ``devtool deploy-target`` or ``bitbake`` is possible.
-   Also ``devtool ide-sdk`` can be used to update the SDK and the IDE
-   configuration at any time.
-
--  ``devtool ide-sdk`` aims to support multiple programming languages and
-   multiple IDEs natively. "Natively" means that the IDE is configured to call
-   the build tool (e.g. ``cmake`` or ``meson``) directly. This has several
-   advantages.
-   First of all, it is usually much faster to call for example ``cmake`` than
-   ``devtool build``.
-   It also allows to benefit from the very good integration that IDEs like
-   VSCode offer for tools like CMake or GDB.
-   
-   However, supporting many programming languages and multiple
-   IDEs is quite an elaborate and constantly evolving thing. Support for IDEs
-   is therefore implemented as plugins. Plugins can also be provided by
-   optional layers.
-
-So much about the introduction to the default mode of ``devtool sdk-ide`` which
-is called the "modified" mode because it uses the workspace created by
-``devtool modify`` and the per recipe :term:`Sysroots <Sysroot>` of BitBake.
-
-For some recipes and use cases, this default behavior of ``devtool ide-sdk``
-with full ``devtool`` and ``bitbake`` integration might not be suitable.
-To offer full feature parity with the SDK and the eSDK, ``devtool ide-sdk`` has
-a second mode called "shared" mode.
-If ``devtool ide-sdk`` is called with the ``--mode=shared`` option, it
-bootstraps an SDK directly from the BitBake environment, which offers the same
-Environment Setup script as described in :ref:`running_the_ext_sdk_env`.
-In addition to the (e)SDK installer-based setup, the IDE gets configured
-to use the shared :term:`Sysroots <Sysroot>` and the tools from the SDK.
-``devtool ide-sdk --mode=shared`` is basically a wrapper for the setup of the
-extensible SDK as described in :ref:`setting_up_ext_sdk_in_build`.
-
-The use of ``devtool ide-sdk`` is an alternative to using one of the SDK
-installers.
-``devtool ide-sdk`` allows the creation of SDKs that offer all the
-functionality of the SDK and the eSDK installers. Compared to the installers,
-however, the SDK created with ``devtool ide-sdk`` is much more flexible.
-For example, it is very easy to change the :term:`MACHINE` in the
-``local.conf`` file, update the layer meta data and then regenerate the SDK.
-
-Let's take a look at an example of how to use ``devtool ide-sdk`` in each of
-the two modes:
-
-#. *Modified mode*:
-
-   In order to use the ``devtool ide-sdk``, a few settings are needed. As a
-   starting example, the following lines of code can be added to the
-   ``local.conf`` file::
-
-      # Build the companion debug file system
-      IMAGE_GEN_DEBUGFS = "1"
-      # Optimize build time: with devtool ide-sdk the dbg tar is not needed
-      IMAGE_FSTYPES_DEBUGFS = ""
-      # Without copying the binaries into roofs-dbg, GDB does not find all source files.
-      IMAGE_CLASSES += "image-combined-dbg"
-
-      # SSH is mandatory, no password simplifies the usage
-      EXTRA_IMAGE_FEATURES += "\
-         ssh-server-openssh \
-         allow-empty-password \
-         allow-root-login \
-         empty-root-password \
-      "
-
-      # Remote debugging needs gdbserver on the target device
-      IMAGE_INSTALL:append = " gdbserver"
-
-      # Add the recipes which should be modified to the image
-      # Otherwise some dependencies might be missing.
-      IMAGE_INSTALL:append = " my-recipe"
-
-   Assuming the BitBake environment is set up correctly and a workspace has
-   been created for the recipe using ``devtool modify my-recipe`` or probably
-   even better by using ``devtool modify my-recipe --debug-build``, the
-   following command can create the SDK and the configuration for VSCode in
-   the recipe workspace::
-
-      $ devtool ide-sdk my-recipe core-image-minimal --target root@192.168.7.2
-
-   The command requires an image recipe (``core-image-minimal`` for this
-   example) that is used to create the SDK.
-   This firmware image should also be installed on the target device.
-   It is possible to pass multiple package recipes::
-
-      $ devtool ide-sdk my-recipe-1 my-recipe-2 core-image-minimal --target root@192.168.7.2
-
-   ``devtool ide-sdk`` tries to create an IDE configuration for all package
-   recipes.
-
-   What this command does exactly depends on the recipe, more precisely on the
-   build tool used by the recipe. The basic idea is to configure the IDE so
-   that it calls the build tool exactly as ``bitbake`` does.
-
-   For example, a CMake preset is created for a recipe that inherits
-   :ref:`ref-classes-cmake`. In the case of VSCode, CMake presets are supported
-   by the CMake Tools plugin. This is an example of how the build configuration
-   used by ``bitbake`` is exported to an IDE configuration that gives exactly
-   the same build results.
-
-   Support for remote debugging with seamless integration into the IDE is
-   important for a cross-SDK. ``devtool ide-sdk`` automatically generates the
-   necessary helper scripts for deploying the compiled artifacts to the target
-   device as well as the necessary configuration for the debugger and the IDE.
-
-   .. note::
-
-      To ensure that the debug symbols on the build machine match the binaries
-      running on the target device, it is essential that the image built by
-      ``devtool ide-sdk`` is running on the target device.
-
-   The default IDE is VSCode. Some hints about using VSCode:
-
-   -  VSCode can be used to work on the BitBake recipes or the application
-      source code.
-      Usually there is one instance of VSCode running in the folder where the
-      BitBake recipes are. This instance has the
-      `Yocto Project BitBake plugin <https://marketplace.visualstudio.com/items?itemName=yocto-project.yocto-bitbake>`_
-      running.
-
-      .. warning::
-
-         Some VSCode plugins (Python, BitBake and others) need a reasonable
-         configuration to work as expected. Otherwise, some plugins try to
-         index the build directory of BitBake, which keeps your system quite
-         busy until an out of memory exception stops this nonsense.
-         Other plugins, such as the BitBake plugin, do not behave as expected.
-
-         To work around such issues, the ``oe-init-build-env`` script creates
-         an initial ``.vscode/settings.json`` file if ``code`` can be found
-         and the ``.vscode`` folder does not yet exist.
-         It is best to run ``oe-init-build-env`` once before starting VSCode.
-         An alternative approach is to use a build folder outside the layers,
-         e.g. ``oe-init-build-env ../build``.
-
-      The BitBake plugin also offers to create devtool workspaces and run
-      ``devtool ide-sdk`` with a few mouse clicks.
-      Of course, issuing commands in the terminal works as well.
-
-   -  To work on the source code of a recipe another instance of VSCode is
-      started in the recipe's workspace. Example::
-
-         code build/workspace/sources/my-recipe
-
-      This instance of VSCode uses plugins that are useful for the development
-      of the application. ``devtool ide-sdk`` generates the necessary
-      ``extensions.json``, ``settings.json``, ``tasks.json``and ``launch.json``
-      configuration files for all the involved plugins.
-
-      When the source code folder present in the workspace folder is opened in
-      VSCode for the first time, a pop-up message recommends installing the
-      required plugins.
-      After accepting the installation of the plugins, working with the source
-      code or some debugging tasks should work as usual with VSCode.
-
-      Starting the VSCode instances in the recipe workspace folders can also be
-      done by a mouse click on the recipe workspaces in the first VSCode
-      instance.
-
-   -  To work with CMake press ``Ctrl + Shift + p``, type ``cmake``. This will
-      show some possible commands like selecting a CMake preset, compiling or
-      running CTest.
-
-      For recipes inheriting :ref:`ref-classes-cmake-qemu` rather than
-      :ref:`ref-classes-cmake`, executing cross-compiled unit tests on the host
-      can be supported transparently with QEMU user-mode.
-
-   -  To work with Meson press ``Ctrl + Shift + p``, type ``meson``. This will
-      show some possible commands like compiling or executing the unit tests.
-
-      A note on running cross-compiled unit tests on the host: Meson enables
-      support for QEMU user mode by default. It is expected that the execution
-      of the unit tests from the IDE will work without any additional steps,
-      given that the code is suitable for the execution on the host machine.
-
-   -  For the deployment to the target device, just press ``Ctrl + Shift + p``,
-      type ``task``.  Select ``install && deploy-target``.
-
-   -  For remote debugging, switch to the debugging view by pressing the "play"
-      button with the ``bug icon`` on the left side. This will provide a green
-      play button with a drop-down list where a debug configuration can be
-      selected.  After selecting one of the generated configurations, press the
-      "play" button.
-
-      Starting a remote debugging session automatically initiates the
-      deployment to the target device. If this is not desired, the
-      ``"dependsOn": ["install && deploy-target...]`` parameter of the tasks
-      with ``"label": "gdbserver start...`` can be removed from the
-      ``tasks.json`` file.
-
-      VSCode supports GDB with many different setups and configurations for
-      many different use cases.  However, most of these setups have some
-      limitations when it comes to cross-development, support only a few target
-      architectures or require a high performance target device. Therefore
-      ``devtool ide-sdk`` supports the classic, generic setup with GDB on the
-      development host and gdbserver on the target device.
-
-      Roughly summarized, this means:
-
-      -  The binaries are copied via SSH to the remote target device by a
-         script referred by ``tasks.json``.
-
-      -  gdbserver is started on the remote target device via SSH by a script
-         referred by ``tasks.json``.
-
-         Changing the parameters that are passed to the debugging executable
-         requires modifying the generated script. The script is located at
-         ``oe-scripts/gdbserver_*``. Defining the parameters in the ``args``
-         field in the ``launch.json`` file does not work.
-
-      -  VSCode connects to gdbserver as documented in
-         `Remote debugging or debugging with a local debugger server
-         <https://code.visualstudio.com/docs/cpp/launch-json-reference#_remote-debugging-or-debugging-with-a-local-debugger-server>`__.
-
-   Additionally ``--ide=none`` is supported. With the ``none`` IDE parameter,
-   some generic configuration files like ``gdbinit`` files and some helper
-   scripts starting gdbserver remotely on the target device as well as the GDB
-   client on the host are generated.
-
-   Here is a usage example for the ``cmake-example`` recipe from the
-   ``meta-selftest`` layer which inherits :ref:`ref-classes-cmake-qemu`:
-
-   .. code-block:: sh
-
-      # Create the SDK
-      devtool modify cmake-example --debug-build
-      devtool ide-sdk cmake-example core-image-minimal -c --ide=none
-
-      # Install the firmware on a target device or start QEMU
-      runqemu
-
-      # From exploring the workspace of cmake-example
-      cd build/workspace/sources/cmake-example
-
-      # Find cmake-native and save the path into a variable
-      # Note: using just cmake instead of $CMAKE_NATIVE would work in many cases
-      CMAKE_NATIVE="$(jq -r '.configurePresets[0] | "\(.cmakeExecutable)"' CMakeUserPresets.json)"
-
-      # List available CMake presets
-      "$CMAKE_NATIVE" --list-presets
-      Available configure presets:
-
-        "cmake-example-cortexa57" - cmake-example: cortexa57
-
-      # Re-compile the already compiled sources
-      "$CMAKE_NATIVE" --build --preset cmake-example-cortexa57
-      ninja: no work to do.
-      # Do a clean re-build
-      "$CMAKE_NATIVE" --build --preset cmake-example-cortexa57 --target clean
-      [1/1] Cleaning all built files...
-      Cleaning... 8 files.
-      "$CMAKE_NATIVE" --build --preset cmake-example-cortexa57 --target all
-      [7/7] Linking CXX executable cmake-example
-
-      # Run the cross-compiled unit tests with QEMU user-mode
-      "$CMAKE_NATIVE" --build --preset cmake-example-cortexa57 --target test
-      [0/1] Running tests...
-      Test project .../build/tmp/work/cortexa57-poky-linux/cmake-example/1.0/cmake-example-1.0
-          Start 1: test-cmake-example
-      1/1 Test #1: test-cmake-example ...............   Passed    0.03 sec
-
-      100% tests passed, 0 tests failed out of 1
-
-      Total Test time (real) =   0.03 sec
-
-      # Using CTest directly is possible as well
-      CTEST_NATIVE="$(dirname "$CMAKE_NATIVE")/ctest"
-
-      # List available CMake presets
-      "$CTEST_NATIVE" --list-presets
-      Available test presets:
-
-        "cmake-example-cortexa57" - cmake-example: cortexa57
-
-      # Run the cross-compiled unit tests with QEMU user-mode
-      "$CTEST_NATIVE" --preset "cmake-example-cortexa57"
-      Test project ...build/tmp/work/cortexa57-poky-linux/cmake-example/1.0/cmake-example-1.0
-          Start 1: test-cmake-example
-      1/1 Test #1: test-cmake-example ...............   Passed    0.03 sec
-
-      100% tests passed, 0 tests failed out of 1
-
-      Total Test time (real) =   0.03 sec
-
-      # Deploying the new build to the target device (default is QEUM at 192.168.7.2)
-      oe-scripts/install_and_deploy_cmake-example-cortexa57
-
-      # Start a remote debugging session with gdbserver on the target and GDB on the host
-      oe-scripts/gdbserver_1234_usr-bin-cmake-example_m
-      oe-scripts/gdb_1234_usr-bin-cmake-example
-      break main
-      run
-      step
-      stepi
-      continue
-      quit
-
-      # Stop gdbserver on the target device
-      oe-scripts/gdbserver_1234_usr-bin-cmake-example_m stop
-
-#. *Shared sysroots mode*
-
-   Creating an SDK with shared :term:`Sysroots <Sysroot>` that contains all the
-   dependencies needed to work with ``my-recipe`` is possible with the following
-   example command::
-
-      $ devtool ide-sdk --mode=shared my-recipe
-
-   For VSCode the cross-toolchain is exposed as a CMake kit. CMake kits are
-   defined in ``~/.local/share/CMakeTools/cmake-tools-kits.json``.
-   The following example shows how the cross-toolchain can be selected in
-   VSCode. First of all we need a folder containing a CMake project.
-   For this example, let's create a CMake project and start VSCode::
-
-      mkdir kit-test
-      echo "project(foo VERSION 1.0)" > kit-test/CMakeLists.txt
-      code kit-test
-
-   If there is a CMake project in the workspace, cross-compilation is
-   supported:
-
-   - Press ``Ctrl + Shift + P``, type ``CMake: Scan for Kits``
-   - Press ``Ctrl + Shift + P``, type ``CMake: Select a Kit``
-
-   Finally most of the features provided by CMake and the IDE should be
-   available.
-
-   Other IDEs than VSCode are supported as well. However,
-   ``devtool ide-sdk --mode=shared --ide=none my-recipe`` is currently
-   just a simple wrapper for the setup of the extensible SDK, as described in
-   :ref:`setting_up_ext_sdk_in_build`.
-
-Use ``devtool upgrade`` to Create a Version of the Recipe that Supports a Newer Version of the Software
--------------------------------------------------------------------------------------------------------
-
-The ``devtool upgrade`` command upgrades an existing recipe to that of a
-more up-to-date version found upstream. Throughout the life of software,
-recipes continually undergo version upgrades by their upstream
-publishers. You can use the ``devtool upgrade`` workflow to make sure
-your recipes you are using for builds are up-to-date with their upstream
-counterparts.
-
-.. note::
-
-   Several methods exist by which you can upgrade recipes ---
-   ``devtool upgrade`` happens to be one. You can read about all the methods by
-   which you can upgrade recipes in the
-   :ref:`dev-manual/upgrading-recipes:upgrading recipes` section of the Yocto
-   Project Development Tasks Manual.
-
-The ``devtool upgrade`` command is flexible enough to allow you to specify
-source code revision and versioning schemes, extract code into or out of the
-``devtool`` :ref:`devtool-the-workspace-layer-structure`, and work with any
-source file forms that the
-:ref:`bitbake-user-manual/bitbake-user-manual-fetching:fetchers` support.
-
-The following diagram shows the common development flow used with the
-``devtool upgrade`` command:
-
-.. image:: figures/sdk-devtool-upgrade-flow.png
-   :width: 100%
-
-#. *Initiate the Upgrade*: The top part of the flow shows the typical
-   scenario by which you use the ``devtool upgrade`` command. The
-   following conditions exist:
-
-   -  The recipe exists in a local layer external to the ``devtool``
-      workspace.
-
-   -  The source files for the new release exist in the same location
-      pointed to by :term:`SRC_URI`
-      in the recipe (e.g. a tarball with the new version number in the
-      name, or as a different revision in the upstream Git repository).
-
-   A common situation is where third-party software has undergone a
-   revision so that it has been upgraded. The recipe you have access to
-   is likely in your own layer. Thus, you need to upgrade the recipe to
-   use the newer version of the software::
-
-      $ devtool upgrade -V version recipe
-
-   By default, the ``devtool upgrade`` command extracts source
-   code into the ``sources`` directory in the
-   :ref:`devtool-the-workspace-layer-structure`.
-   If you want the code extracted to any other location, you need to
-   provide the ``srctree`` positional argument with the command as follows::
-
-      $ devtool upgrade -V version recipe srctree
-
-   .. note::
-
-      In this example, the "-V" option specifies the new version. If you
-      don't use "-V", the command upgrades the recipe to the latest
-      version.
-
-   If the source files pointed to by the :term:`SRC_URI` statement in the
-   recipe are in a Git repository, you must provide the "-S" option and
-   specify a revision for the software.
-
-   Once ``devtool`` locates the recipe, it uses the :term:`SRC_URI` variable
-   to locate the source code and any local patch files from other
-   developers. The result is that the command sets up the source code,
-   the new version of the recipe, and an append file all within the
-   workspace.
-
-   Additionally, if you have any non-patch local files (i.e. files
-   referred to with ``file://`` entries in :term:`SRC_URI` statement
-   excluding ``*.patch/`` or ``*.diff``), these files are copied to an
-   ``oe-local-files`` folder under the newly created source tree.
-   Copying the files here gives you a convenient area from which you can
-   modify the files. Any changes or additions you make to those files
-   are incorporated into the build the next time you build the software
-   just as are other changes you might have made to the source.
-
-#. *Resolve any Conflicts created by the Upgrade*: Conflicts could happen
-   after upgrading the software to a new version. Conflicts occur
-   if your recipe specifies some patch files in :term:`SRC_URI` that
-   conflict with changes made in the new version of the software. For
-   such cases, you need to resolve the conflicts by editing the source
-   and following the normal ``git rebase`` conflict resolution process.
-
-   Before moving onto the next step, be sure to resolve any such
-   conflicts created through use of a newer or different version of the
-   software.
-
-#. *Build the Recipe or Rebuild the Image*: The next step you take
-   depends on what you are going to do with the new code.
-
-   If you need to eventually move the build output to the target
-   hardware, use the following ``devtool`` command::
-
-      $ devtool build recipe
-
-   On the other hand, if you want an image to contain the recipe's
-   packages from the workspace for immediate deployment onto a device
-   (e.g. for testing purposes), you can use the ``devtool build-image``
-   command::
-
-      $ devtool build-image image
-
-#. *Deploy the Build Output*: When you use the ``devtool build`` command
-   or ``bitbake`` to build your recipe, you probably want to see if the
-   resulting build output works as expected on target hardware.
-
-   .. note::
-
-      This step assumes you have a previously built image that is
-      already either running in QEMU or running on actual hardware.
-      Also, it is assumed that for deployment of the image to the
-      target, SSH is installed in the image and if the image is running
-      on real hardware that you have network access to and from your
-      development machine.
-
-   You can deploy your build output to that target hardware by using the
-   ``devtool deploy-target`` command::
-
-      $ devtool deploy-target recipe target
-
-   The target is a live target machine running as an SSH server.
-
-   You can, of course, also deploy the image you build using the
-   ``devtool build-image`` command to actual hardware. However,
-   ``devtool`` does not provide a specific command that allows you to do
-   this.
-
-#. *Finish Your Work With the Recipe*: The ``devtool finish`` command
-   creates any patches corresponding to commits in the local Git
-   repository, moves the new recipe to a more permanent layer, and then
-   resets the recipe so that the recipe is built normally rather than
-   from the workspace.
-
-   Any work you did in the ``oe-local-files`` directory is preserved in
-   the original files next to the recipe during the ``devtool finish``
-   command.
-
-   If you specify a destination layer that is the same as the original
-   source, then the old version of the recipe and associated files are
-   removed prior to adding the new version::
-
-      $ devtool finish recipe layer
-
-   .. note::
-
-      Any changes you want to turn into patches must be committed to the
-      Git repository in the source tree.
-
-   As a final process of the ``devtool finish`` command, the state of
-   the standard layers and the upstream source is restored so that you
-   can build the recipe from those areas rather than the workspace.
-
-   .. note::
-
-      You can use the ``devtool reset`` command to put things back should you
-      decide you do not want to proceed with your work. If you do use this
-      command, realize that the source tree is preserved.
-
-A Closer Look at ``devtool add``
-================================
-
-The ``devtool add`` command automatically creates a recipe based on the
-source tree you provide with the command. Currently, the command has
-support for the following:
-
--  Autotools (``autoconf`` and ``automake``)
-
--  CMake
-
--  Scons
-
--  ``qmake``
-
--  Plain ``Makefile``
-
--  Out-of-tree kernel module
-
--  Binary package (i.e. "-b" option)
-
--  Node.js module
-
--  Python modules that use ``setuptools`` or ``distutils``
-
-Apart from binary packages, the determination of how a source tree
-should be treated is automatic based on the files present within that
-source tree. For example, if a ``CMakeLists.txt`` file is found, then
-the source tree is assumed to be using CMake and is treated accordingly.
-
-.. note::
-
-   In most cases, you need to edit the automatically generated recipe in
-   order to make it build properly. Typically, you would go through
-   several edit and build cycles until the recipe successfully builds.
-   Once the recipe builds, you could use possible further iterations to
-   test the recipe on the target device.
-
-The remainder of this section covers specifics regarding how parts of
-the recipe are generated.
-
-Name and Version
-----------------
-
-If you do not specify a name and version on the command line,
-``devtool add`` uses various metadata within the source tree in an
-attempt to determine the name and version of the software being built.
-Based on what the tool determines, ``devtool`` sets the name of the
-created recipe file accordingly.
-
-If ``devtool`` cannot determine the name and version, the command prints
-an error. For such cases, you must re-run the command and provide the
-name and version, just the name, or just the version as part of the
-command line.
-
-Sometimes the name or version determined from the source tree might be
-incorrect. For such a case, you must reset the recipe::
-
-   $ devtool reset -n recipename
-
-After running the ``devtool reset`` command, you need to
-run ``devtool add`` again and provide the name or the version.
-
-Dependency Detection and Mapping
---------------------------------
-
-The ``devtool add`` command attempts to detect build-time dependencies and map
-them to other recipes in the system. During this mapping, the command fills in
-the names of those recipes as part of the :term:`DEPENDS` variable within the
-recipe. If a dependency cannot be mapped, ``devtool`` places a comment
-in the recipe indicating such. The inability to map a dependency can
-result from naming not being recognized or because the dependency simply
-is not available. For cases where the dependency is not available, you
-must use the ``devtool add`` command to add an additional recipe that
-satisfies the dependency. Once you add that recipe, you need to update
-the :term:`DEPENDS` variable in the original recipe to include the new
-recipe.
-
-If you need to add runtime dependencies, you can do so by adding the
-following to your recipe::
-
-   RDEPENDS:${PN} += "dependency1 dependency2 ..."
-
-.. note::
-
-   The ``devtool add`` command often cannot distinguish between mandatory and
-   optional dependencies. Consequently, some of the detected dependencies might
-   in fact be optional. When in doubt, consult the documentation or the
-   configure script for the software the recipe is building for further
-   details. In some cases, you might find you can substitute the
-   dependency with an option that disables the associated functionality
-   passed to the configure script.
-
-License Detection
------------------
-
-The ``devtool add`` command attempts to determine if the software you are
-adding is able to be distributed under a common, open-source license. If
-so, the command sets the :term:`LICENSE` value accordingly.
-You should double-check the value added by the command against the
-documentation or source files for the software you are building and, if
-necessary, update that :term:`LICENSE` value.
-
-The ``devtool add`` command also sets the :term:`LIC_FILES_CHKSUM`
-value to point to all files that appear to be license-related. Realize
-that license statements often appear in comments at the top of source
-files or within the documentation. In such cases, the command does not
-recognize those license statements. Consequently, you might need to
-amend the :term:`LIC_FILES_CHKSUM` variable to point to one or more of those
-comments if present. Setting :term:`LIC_FILES_CHKSUM` is particularly
-important for third-party software. The mechanism attempts to ensure
-correct licensing should you upgrade the recipe to a newer upstream
-version in future. Any change in licensing is detected and you receive
-an error prompting you to check the license text again.
-
-If the ``devtool add`` command cannot determine licensing information,
-``devtool`` sets the :term:`LICENSE` value to "CLOSED" and leaves the
-:term:`LIC_FILES_CHKSUM` value unset. This behavior allows you to continue
-with development even though the settings are unlikely to be correct in
-all cases. You should check the documentation or source files for the
-software you are building to determine the actual license.
-
-Adding Makefile-Only Software
------------------------------
-
-The use of Make by itself is very common in both proprietary and
-open-source software. Unfortunately, Makefiles are often not written
-with cross-compilation in mind. Thus, ``devtool add`` often cannot do
-very much to ensure that these Makefiles build correctly. It is very
-common, for example, to explicitly call ``gcc`` instead of using the
-:term:`CC` variable. Usually, in a
-cross-compilation environment, ``gcc`` is the compiler for the build
-host and the cross-compiler is named something similar to
-``arm-poky-linux-gnueabi-gcc`` and might require arguments (e.g. to
-point to the associated sysroot for the target machine).
-
-When writing a recipe for Makefile-only software, keep the following in
-mind:
-
--  You probably need to patch the Makefile to use variables instead of
-   hardcoding tools within the toolchain such as ``gcc`` and ``g++``.
-
--  The environment in which Make runs is set up with various standard
-   variables for compilation (e.g. :term:`CC`, :term:`CXX`, and so forth) in a
-   similar manner to the environment set up by the SDK's environment
-   setup script. One easy way to see these variables is to run the
-   ``devtool build`` command on the recipe and then look in
-   ``oe-logs/run.do_compile``. Towards the top of this file, there is
-   a list of environment variables that are set. You can take
-   advantage of these variables within the Makefile.
-
--  If the Makefile sets a default for a variable using "=", that default
-   overrides the value set in the environment, which is usually not
-   desirable. For this case, you can either patch the Makefile so it
-   sets the default using the "?=" operator, or you can alternatively
-   force the value on the ``make`` command line. To force the value on
-   the command line, add the variable setting to
-   :term:`EXTRA_OEMAKE` or
-   :term:`PACKAGECONFIG_CONFARGS`
-   within the recipe. Here is an example using :term:`EXTRA_OEMAKE`::
-
-      EXTRA_OEMAKE += "'CC=${CC}' 'CXX=${CXX}'"
-
-   In the above example,
-   single quotes are used around the variable settings as the values are
-   likely to contain spaces because required default options are passed
-   to the compiler.
-
--  Hardcoding paths inside Makefiles is often problematic in a
-   cross-compilation environment. This is particularly true because
-   those hardcoded paths often point to locations on the build host and
-   thus will either be read-only or will introduce contamination into
-   the cross-compilation because they are specific to the build host
-   rather than the target. Patching the Makefile to use prefix variables
-   or other path variables is usually the way to handle this situation.
-
--  Sometimes a Makefile runs target-specific commands such as
-   ``ldconfig``. For such cases, you might be able to apply patches that
-   remove these commands from the Makefile.
-
-Adding Native Tools
--------------------
-
-Often, you need to build additional tools that run on the :term:`Build Host`
-as opposed to the target. You should indicate this requirement by using one of
-the following methods when you run ``devtool add``:
-
--  Specify the name of the recipe such that it ends with "-native".
-   Specifying the name like this produces a recipe that only builds for
-   the build host.
-
--  Specify the "--also-native" option with the ``devtool add``
-   command. Specifying this option creates a recipe file that still
-   builds for the target but also creates a variant with a "-native"
-   suffix that builds for the build host.
-
-.. note::
-
-   If you need to add a tool that is shipped as part of a source tree
-   that builds code for the target, you can typically accomplish this by
-   building the native and target parts separately rather than within
-   the same compilation process. Realize though that with the
-   "--also-native" option, you can add the tool using just one
-   recipe file.
-
-Adding Node.js Modules
-----------------------
-
-You can use the ``devtool add`` command two different ways to add
-Node.js modules: through ``npm`` or from a repository or local source.
-
-Use the following form to add Node.js modules through ``npm``::
-
-   $ devtool add "npm://registry.npmjs.org;name=forever;version=0.15.1"
-
-The name and
-version parameters are mandatory. Lockdown and shrinkwrap files are
-generated and pointed to by the recipe in order to freeze the version
-that is fetched for the dependencies according to the first time. This
-also saves checksums that are verified on future fetches. Together,
-these behaviors ensure the reproducibility and integrity of the build.
-
-.. note::
-
-   -  You must use quotes around the URL. ``devtool add`` does not
-      require the quotes, but the shell considers ";" as a splitter
-      between multiple commands. Thus, without the quotes,
-      ``devtool add`` does not receive the other parts, which results in
-      several "command not found" errors.
-
-   -  In order to support adding Node.js modules, a ``nodejs`` recipe
-      must be part of your SDK.
-
-As mentioned earlier, you can also add Node.js modules directly from a
-repository or local source tree. To add modules this way, use
-``devtool add`` in the following form::
-
-   $ devtool add https://github.com/diversario/node-ssdp
-
-In this example, ``devtool`` fetches the specified Git repository, detects the
-code as Node.js code, fetches dependencies using ``npm``, and sets
-:term:`SRC_URI` accordingly.
-
-Working With Recipes
-====================
-
-When building a recipe using the ``devtool build`` command, the typical
-build progresses as follows:
-
-#. Fetch the source
-
-#. Unpack the source
-
-#. Configure the source
-
-#. Compile the source
-
-#. Install the build output
-
-#. Package the installed output
-
-For recipes in the workspace, fetching and unpacking is disabled as the
-source tree has already been prepared and is persistent. Each of these
-build steps is defined as a function (task), usually with a "do\_" prefix
-(e.g. :ref:`ref-tasks-fetch`,
-:ref:`ref-tasks-unpack`, and so
-forth). These functions are typically shell scripts but can instead be
-written in Python.
-
-If you look at the contents of a recipe, you will see that the recipe
-does not include complete instructions for building the software.
-Instead, common functionality is encapsulated in classes inherited with
-the ``inherit`` directive. This technique leaves the recipe to describe
-just the things that are specific to the software being built. There is
-a :ref:`ref-classes-base` class that is implicitly inherited by all recipes
-and provides the functionality that most recipes typically need.
-
-The remainder of this section presents information useful when working
-with recipes.
-
-Finding Logs and Work Files
----------------------------
-
-After the first run of the ``devtool build`` command, recipes that were
-previously created using the ``devtool add`` command or whose sources
-were modified using the ``devtool modify`` command contain symbolic
-links created within the source tree:
-
--  ``oe-logs``: This link points to the directory in which log files and
-   run scripts for each build step are created.
-
--  ``oe-workdir``: This link points to the temporary work area for the
-   recipe. The following locations under ``oe-workdir`` are particularly
-   useful:
-
-   -  ``image/``: Contains all of the files installed during the
-      :ref:`ref-tasks-install` stage.
-      Within a recipe, this directory is referred to by the expression
-      ``${``\ :term:`D`\ ``}``.
-
-   -  ``sysroot-destdir/``: Contains a subset of files installed within
-      :ref:`ref-tasks-install` that have been put into the shared sysroot. For
-      more information, see the
-      ":ref:`dev-manual/new-recipe:sharing files between recipes`" section.
-
-   -  ``packages-split/``: Contains subdirectories for each package
-      produced by the recipe. For more information, see the
-      ":ref:`sdk-manual/extensible:packaging`" section.
-
-You can use these links to get more information on what is happening at
-each build step.
-
-Setting Configure Arguments
----------------------------
-
-If the software your recipe is building uses GNU autoconf, then a fixed
-set of arguments is passed to it to enable cross-compilation plus any
-extras specified by :term:`EXTRA_OECONF` or :term:`PACKAGECONFIG_CONFARGS`
-set within the recipe. If you wish to pass additional options, add them
-to :term:`EXTRA_OECONF` or :term:`PACKAGECONFIG_CONFARGS`. Other supported build
-tools have similar variables (e.g.  :term:`EXTRA_OECMAKE` for CMake,
-:term:`EXTRA_OESCONS` for Scons, and so forth). If you need to pass anything on
-the ``make`` command line, you can use :term:`EXTRA_OEMAKE` or the
-:term:`PACKAGECONFIG_CONFARGS` variables to do so.
-
-You can use the ``devtool configure-help`` command to help you set the
-arguments listed in the previous paragraph. The command determines the
-exact options being passed, and shows them to you along with any custom
-arguments specified through :term:`EXTRA_OECONF` or
-:term:`PACKAGECONFIG_CONFARGS`. If applicable, the command also shows you
-the output of the configure script's "--help" option as a
-reference.
-
-Sharing Files Between Recipes
------------------------------
-
-Recipes often need to use files provided by other recipes on the
-:term:`Build Host`. For example,
-an application linking to a common library needs access to the library
-itself and its associated headers. The way this access is accomplished
-within the extensible SDK is through the sysroot. There is one sysroot per
-"machine" for which the SDK is being built. In practical terms, this
-means there is a sysroot for the target machine, and a sysroot for
-the build host.
-
-Recipes should never write files directly into the sysroot. Instead,
-files should be installed into standard locations during the
-:ref:`ref-tasks-install` task within the ``${``\ :term:`D`\ ``}`` directory. A
-subset of these files automatically goes into the sysroot. The reason
-for this limitation is that almost all files that go into the sysroot
-are cataloged in manifests in order to ensure they can be removed later
-when a recipe is modified or removed. Thus, the sysroot is able to
-remain free from stale files.
-
-Packaging
----------
-
-Packaging is not always particularly relevant within the extensible SDK.
-However, if you examine how build output gets into the final image on
-the target device, it is important to understand packaging because the
-contents of the image are expressed in terms of packages and not
-recipes.
-
-During the :ref:`ref-tasks-package` task, files installed during the
-:ref:`ref-tasks-install` task are split into one main package, which is almost
-always named the same as the recipe, and into several other packages. This
-separation exists because not all of those installed files are useful in every
-image. For example, you probably do not need any of the documentation installed
-in a production image. Consequently, for each recipe the documentation
-files are separated into a ``-doc`` package. Recipes that package
-software containing optional modules or plugins might undergo additional
-package splitting as well.
-
-After building a recipe, you can see where files have gone by looking in
-the ``oe-workdir/packages-split`` directory, which contains a
-subdirectory for each package. Apart from some advanced cases, the
-:term:`PACKAGES` and :term:`FILES` variables controls
-splitting. The :term:`PACKAGES` variable lists all of the packages to be
-produced, while the :term:`FILES` variable specifies which files to include
-in each package by using an override to specify the package. For
-example, ``FILES:${PN}`` specifies the files to go into the main package
-(i.e. the main package has the same name as the recipe and
-``${``\ :term:`PN`\ ``}`` evaluates to the
-recipe name). The order of the :term:`PACKAGES` value is significant. For
-each installed file, the first package whose :term:`FILES` value matches the
-file is the package into which the file goes. Both the :term:`PACKAGES` and
-:term:`FILES` variables have default values. Consequently, you might find
-you do not even need to set these variables in your recipe unless the
-software the recipe is building installs files into non-standard
-locations.
-
-Restoring the Target Device to its Original State
-=================================================
-
-If you use the ``devtool deploy-target`` command to write a recipe's
-build output to the target, and you are working on an existing component
-of the system, then you might find yourself in a situation where you
-need to restore the original files that existed prior to running the
-``devtool deploy-target`` command. Because the ``devtool deploy-target``
-command backs up any files it overwrites, you can use the
-``devtool undeploy-target`` command to restore those files and remove
-any other files the recipe deployed. Consider the following example::
-
-   $ devtool undeploy-target lighttpd root@192.168.7.2
-
-If you have deployed
-multiple applications, you can remove them all using the "-a" option
-thus restoring the target device to its original state::
-
-   $ devtool undeploy-target -a root@192.168.7.2
-
-Information about files deployed to
-the target as well as any backed up files are stored on the target
-itself. This storage, of course, requires some additional space on the
-target machine.
-
-.. note::
-
-   The ``devtool deploy-target`` and ``devtool undeploy-target`` commands do
-   not currently interact with any package management system on the target
-   device (e.g. RPM or OPKG). Consequently, you should not intermingle
-   ``devtool deploy-target`` and package manager operations on the target
-   device. Doing so could result in a conflicting set of files.
+To learn how to use ``devtool`` to add, modify, upgrade recipes and more, see
+the :ref:`dev-manual/devtool:Using the \`\`devtool\`\` command-line tool`
+section of the Yocto Project Development Tasks Manual.
 
 Installing Additional Items Into the Extensible SDK
 ===================================================
diff --git a/documentation/what-i-wish-id-known.rst b/documentation/what-i-wish-id-known.rst
index 5bc55804f6..836097910d 100644
--- a/documentation/what-i-wish-id-known.rst
+++ b/documentation/what-i-wish-id-known.rst
@@ -136,7 +136,7 @@ contact us with other suggestions.
    valuable links: :ref:`dev-manual/development-shell:Using a Development
    Shell` for information on how to build and run a specific task using
    devshell. Also, the :ref:`SDK manual shows how to build out a specific recipe
-   <sdk-manual/extensible:use \`\`devtool modify\`\` to modify the source of an existing component>`.
+   <dev-manual/devtool:use \`\`devtool modify\`\` to modify the source of an existing component>`.
 
 #. **An ambiguous definition: Package vs Recipe:**
    A recipe contains instructions the build system uses to create