poky/documentation/sdk-manual/appendix-obtain.rst - openbmc/openbmc - Gitiles

 .. SPDX-License-Identifier: CC-BY-SA-2.0-UK

 *****************
 Obtaining the SDK
 *****************

 Locating Pre-Built SDK Installers
 =================================

 You can use existing, pre-built toolchains by locating and running an
 SDK installer script that ships with the Yocto Project. Using this
 method, you select and download an architecture-specific SDK installer
 and then run the script to hand-install the toolchain.

 Follow these steps to locate and hand-install the toolchain:

 1. *Go to the Installers Directory:* Go to
    :yocto_dl:`/releases/yocto/yocto-&DISTRO;/toolchain/`

 2. *Open the Folder for Your Build Host:* Open the folder that matches
    your :term:`Build Host` (i.e.
    ``i686`` for 32-bit machines or ``x86_64`` for 64-bit machines).

 3. *Locate and Download the SDK Installer:* You need to find and
    download the installer appropriate for your build host, target
    hardware, and image type.

    The installer files (``*.sh``) follow this naming convention::

       poky-glibc-host_system-core-image-type-arch-toolchain[-ext]-release.sh

       Where:
           host_system is a string representing your development system:
                  "i686" or "x86_64"

           type is a string representing the image:
                 "sato" or "minimal"

           arch is a string representing the target architecture:
                  "aarch64", "armv5e", "core2-64", "cortexa8hf-neon", "i586", "mips32r2",
                  "mips64", or "ppc7400"

           release is the version of Yocto Project.

           NOTE:
              The standard SDK installer does not have the "-ext" string as
              part of the filename.


    The toolchains provided by the Yocto
    Project are based off of the ``core-image-sato`` and
    ``core-image-minimal`` images and contain libraries appropriate for
    developing against those images.

    For example, if your build host is a 64-bit x86 system and you need
    an extended SDK for a 64-bit core2 target, go into the ``x86_64``
    folder and download the following installer::

       poky-glibc-x86_64-core-image-sato-core2-64-toolchain-ext-&DISTRO;.sh

 4. *Run the Installer:* Be sure you have execution privileges and run
    the installer. Following is an example from the ``Downloads``
    directory::

       $ ~/Downloads/poky-glibc-x86_64-core-image-sato-core2-64-toolchain-ext-&DISTRO;.sh

    During execution of the script, you choose the root location for the
    toolchain. See the
    ":ref:`sdk-manual/appendix-obtain:installed standard sdk directory structure`"
    section and the
    ":ref:`sdk-manual/appendix-obtain:installed extensible sdk directory structure`"
    section for more information.

 Building an SDK Installer
 =========================

 As an alternative to locating and downloading an SDK installer, you can
 build the SDK installer. Follow these steps:

 1. *Set Up the Build Environment:* Be sure you are set up to use BitBake
    in a shell. See the ":ref:`dev-manual/start:preparing the build host`" section
    in the Yocto Project Development Tasks Manual for information on how
    to get a build host ready that is either a native Linux machine or a
    machine that uses CROPS.

 2. *Clone the ``poky`` Repository:* You need to have a local copy of the
    Yocto Project :term:`Source Directory`
    (i.e. a local
    ``poky`` repository). See the ":ref:`dev-manual/start:cloning the \`\`poky\`\` repository`" and
    possibly the ":ref:`dev-manual/start:checking out by branch in poky`" and
    ":ref:`dev-manual/start:checking out by tag in poky`" sections
    all in the Yocto Project Development Tasks Manual for information on
    how to clone the ``poky`` repository and check out the appropriate
    branch for your work.

 3. *Initialize the Build Environment:* While in the root directory of
    the Source Directory (i.e. ``poky``), run the
    :ref:`structure-core-script` environment
    setup script to define the OpenEmbedded build environment on your
    build host.
    ::

       $ source oe-init-build-env

    Among other things, the script
    creates the :term:`Build Directory`,
    which is
    ``build`` in this case and is located in the Source Directory. After
    the script runs, your current working directory is set to the
    ``build`` directory.

 4. *Make Sure You Are Building an Installer for the Correct Machine:*
    Check to be sure that your
    :term:`MACHINE` variable in the
    ``local.conf`` file in your Build Directory matches the architecture
    for which you are building.

 5. *Make Sure Your SDK Machine is Correctly Set:* If you are building a
    toolchain designed to run on an architecture that differs from your
    current development host machine (i.e. the build host), be sure that
    the :term:`SDKMACHINE` variable
    in the ``local.conf`` file in your Build Directory is correctly set.

    .. note::

       If you are building an SDK installer for the Extensible SDK, the
       SDKMACHINE
       value must be set for the architecture of the machine you are
       using to build the installer. If
       SDKMACHINE
       is not set appropriately, the build fails and provides an error
       message similar to the following::

               The extensible SDK can currently only be built for the same architecture as the machine being built on - SDK_ARCH is
               set to i686 (likely via setting SDKMACHINE) which is different from the architecture of the build machine (x86_64).
               Unable to continue.


 6. *Build the SDK Installer:* To build the SDK installer for a standard
    SDK and populate the SDK image, use the following command form. Be
    sure to replace ``image`` with an image (e.g. "core-image-sato")::

       $ bitbake image -c populate_sdk

    You can do the same for the extensible SDK using this command form::

       $ bitbake image -c populate_sdk_ext

    These commands produce an SDK installer that contains the sysroot
    that matches your target root filesystem.

    When the ``bitbake`` command completes, the SDK installer will be in
    ``tmp/deploy/sdk`` in the Build Directory.

    .. note::

       -  By default, the previous BitBake command does not build static
          binaries. If you want to use the toolchain to build these types
          of libraries, you need to be sure your SDK has the appropriate
          static development libraries. Use the
          :term:`TOOLCHAIN_TARGET_TASK`
          variable inside your ``local.conf`` file before building the
          SDK installer. Doing so ensures that the eventual SDK
          installation process installs the appropriate library packages
          as part of the SDK. Following is an example using ``libc``
          static development libraries: TOOLCHAIN_TARGET_TASK:append = "
          libc-staticdev"

 7. *Run the Installer:* You can now run the SDK installer from
    ``tmp/deploy/sdk`` in the Build Directory. Following is an example::

       $ cd poky/build/tmp/deploy/sdk
       $ ./poky-glibc-x86_64-core-image-sato-core2-64-toolchain-ext-&DISTRO;.sh

    During execution of the script, you choose the root location for the
    toolchain. See the
    ":ref:`sdk-manual/appendix-obtain:installed standard sdk directory structure`"
    section and the
    ":ref:`sdk-manual/appendix-obtain:installed extensible sdk directory structure`"
    section for more information.

 Extracting the Root Filesystem
 ==============================

 After installing the toolchain, for some use cases you might need to
 separately extract a root filesystem:

 -  You want to boot the image using NFS.

 -  You want to use the root filesystem as the target sysroot.

 -  You want to develop your target application using the root filesystem
    as the target sysroot.

 Follow these steps to extract the root filesystem:

 1. *Locate and Download the Tarball for the Pre-Built Root Filesystem
    Image File:* You need to find and download the root filesystem image
    file that is appropriate for your target system. These files are kept
    in machine-specific folders in the
    :yocto_dl:`Index of Releases </releases/yocto/yocto-&DISTRO;/machines/>`
    in the "machines" directory.

    The machine-specific folders of the "machines" directory contain
    tarballs (``*.tar.bz2``) for supported machines. These directories
    also contain flattened root filesystem image files (``*.ext4``),
    which you can use with QEMU directly.

    The pre-built root filesystem image files follow these naming
    conventions::

       core-image-profile-arch.tar.bz2

       Where:
           profile is the filesystem image's profile:
                     lsb, lsb-dev, lsb-sdk, minimal, minimal-dev, minimal-initramfs,
                     sato, sato-dev, sato-sdk, sato-sdk-ptest. For information on
                     these types of image profiles, see the "Images" chapter in
                     the Yocto Project Reference Manual.

           arch is a string representing the target architecture:
                     beaglebone-yocto, beaglebone-yocto-lsb, edgerouter, edgerouter-lsb,
                     genericx86, genericx86-64, genericx86-64-lsb, genericx86-lsb and qemu*.

    The root filesystems
    provided by the Yocto Project are based off of the
    ``core-image-sato`` and ``core-image-minimal`` images.

    For example, if you plan on using a BeagleBone device as your target
    hardware and your image is a ``core-image-sato-sdk`` image, you can
    download the following file::

       core-image-sato-sdk-beaglebone-yocto.tar.bz2

 2. *Initialize the Cross-Development Environment:* You must ``source``
    the cross-development environment setup script to establish necessary
    environment variables.

    This script is located in the top-level directory in which you
    installed the toolchain (e.g. ``poky_sdk``).

    Following is an example based on the toolchain installed in the
    ":ref:`sdk-manual/appendix-obtain:locating pre-built sdk installers`" section::

       $ source poky_sdk/environment-setup-core2-64-poky-linux

 3. *Extract the Root Filesystem:* Use the ``runqemu-extract-sdk``
    command and provide the root filesystem image.

    Following is an example command that extracts the root filesystem
    from a previously built root filesystem image that was downloaded
    from the :yocto_dl:`Index of Releases </releases/yocto/yocto-&DISTRO;/machines/>`.
    This command extracts the root filesystem into the ``core2-64-sato``
    directory::

       $ runqemu-extract-sdk ~/Downloads/core-image-sato-sdk-beaglebone-yocto.tar.bz2 ~/beaglebone-sato

    You could now point to the target sysroot at ``beaglebone-sato``.

 Installed Standard SDK Directory Structure
 ==========================================

 The following figure shows the resulting directory structure after you
 install the Standard SDK by running the ``*.sh`` SDK installation
 script:

 .. image:: figures/sdk-installed-standard-sdk-directory.png
    :scale: 100%

 The installed SDK consists of an environment setup script for the SDK, a
 configuration file for the target, a version file for the target, and
 the root filesystem (``sysroots``) needed to develop objects for the
 target system.

 Within the figure, italicized text is used to indicate replaceable
 portions of the file or directory name. For example, install_dir/version
 is the directory where the SDK is installed. By default, this directory
 is ``/opt/poky/``. And, version represents the specific snapshot of the
 SDK (e.g. &DISTRO;). Furthermore, target represents the target architecture
 (e.g. ``i586``) and host represents the development system's
 architecture (e.g. ``x86_64``). Thus, the complete names of the two
 directories within the ``sysroots`` could be ``i586-poky-linux`` and
 ``x86_64-pokysdk-linux`` for the target and host, respectively.

 Installed Extensible SDK Directory Structure
 ============================================

 The following figure shows the resulting directory structure after you
 install the Extensible SDK by running the ``*.sh`` SDK installation
 script:

 .. image:: figures/sdk-installed-extensible-sdk-directory.png
    :scale: 80%
    :align: center

 The installed directory structure for the extensible SDK is quite
 different than the installed structure for the standard SDK. The
 extensible SDK does not separate host and target parts in the same
 manner as does the standard SDK. The extensible SDK uses an embedded
 copy of the OpenEmbedded build system, which has its own sysroots.

 Of note in the directory structure are an environment setup script for
 the SDK, a configuration file for the target, a version file for the
 target, and log files for the OpenEmbedded build system preparation
 script run by the installer and BitBake.

 Within the figure, italicized text is used to indicate replaceable
 portions of the file or directory name. For example, install_dir is the
 directory where the SDK is installed, which is ``poky_sdk`` by default,
 and target represents the target architecture (e.g. ``i586``).
	.. SPDX-License-Identifier: CC-BY-SA-2.0-UK

	*****************
	Obtaining the SDK
	*****************

	Locating Pre-Built SDK Installers
	=================================

	You can use existing, pre-built toolchains by locating and running an
	SDK installer script that ships with the Yocto Project. Using this
	method, you select and download an architecture-specific SDK installer
	and then run the script to hand-install the toolchain.

	Follow these steps to locate and hand-install the toolchain:

	1. Go to the Installers Directory: Go to
	:yocto_dl:`/releases/yocto/yocto-&DISTRO;/toolchain/`

	2. Open the Folder for Your Build Host: Open the folder that matches
	your :term:`Build Host` (i.e.
	``i686`` for 32-bit machines or ``x86_64`` for 64-bit machines).

	3. Locate and Download the SDK Installer: You need to find and
	download the installer appropriate for your build host, target
	hardware, and image type.

	The installer files (``*.sh``) follow this naming convention::

	poky-glibc-host_system-core-image-type-arch-toolchain[-ext]-release.sh

	Where:
	host_system is a string representing your development system:
	"i686" or "x86_64"

	type is a string representing the image:
	"sato" or "minimal"

	arch is a string representing the target architecture:
	"aarch64", "armv5e", "core2-64", "cortexa8hf-neon", "i586", "mips32r2",
	"mips64", or "ppc7400"

	release is the version of Yocto Project.

	NOTE:
	The standard SDK installer does not have the "-ext" string as
	part of the filename.


	The toolchains provided by the Yocto
	Project are based off of the ``core-image-sato`` and
	``core-image-minimal`` images and contain libraries appropriate for
	developing against those images.

	For example, if your build host is a 64-bit x86 system and you need
	an extended SDK for a 64-bit core2 target, go into the ``x86_64``
	folder and download the following installer::

	poky-glibc-x86_64-core-image-sato-core2-64-toolchain-ext-&DISTRO;.sh

	4. Run the Installer: Be sure you have execution privileges and run
	the installer. Following is an example from the ``Downloads``
	directory::

	$ ~/Downloads/poky-glibc-x86_64-core-image-sato-core2-64-toolchain-ext-&DISTRO;.sh

	During execution of the script, you choose the root location for the
	toolchain. See the
	":ref:`sdk-manual/appendix-obtain:installed standard sdk directory structure`"
	section and the
	":ref:`sdk-manual/appendix-obtain:installed extensible sdk directory structure`"
	section for more information.

	Building an SDK Installer
	=========================

	As an alternative to locating and downloading an SDK installer, you can
	build the SDK installer. Follow these steps:

	1. Set Up the Build Environment: Be sure you are set up to use BitBake
	in a shell. See the ":ref:`dev-manual/start:preparing the build host`" section
	in the Yocto Project Development Tasks Manual for information on how
	to get a build host ready that is either a native Linux machine or a
	machine that uses CROPS.

	2. Clone the ``poky`` Repository: You need to have a local copy of the
	Yocto Project :term:`Source Directory`
	(i.e. a local
	``poky`` repository). See the ":ref:`dev-manual/start:cloning the \`\`poky\`\` repository`" and
	possibly the ":ref:`dev-manual/start:checking out by branch in poky`" and
	":ref:`dev-manual/start:checking out by tag in poky`" sections
	all in the Yocto Project Development Tasks Manual for information on
	how to clone the ``poky`` repository and check out the appropriate
	branch for your work.

	3. Initialize the Build Environment: While in the root directory of
	the Source Directory (i.e. ``poky``), run the
	:ref:`structure-core-script` environment
	setup script to define the OpenEmbedded build environment on your
	build host.
	::

	$ source oe-init-build-env

	Among other things, the script
	creates the :term:`Build Directory`,
	which is
	``build`` in this case and is located in the Source Directory. After
	the script runs, your current working directory is set to the
	``build`` directory.

	4. Make Sure You Are Building an Installer for the Correct Machine:
	Check to be sure that your
	:term:`MACHINE` variable in the
	``local.conf`` file in your Build Directory matches the architecture
	for which you are building.

	5. Make Sure Your SDK Machine is Correctly Set: If you are building a
	toolchain designed to run on an architecture that differs from your
	current development host machine (i.e. the build host), be sure that
	the :term:`SDKMACHINE` variable
	in the ``local.conf`` file in your Build Directory is correctly set.

	.. note::

	If you are building an SDK installer for the Extensible SDK, the
	SDKMACHINE
	value must be set for the architecture of the machine you are
	using to build the installer. If
	SDKMACHINE
	is not set appropriately, the build fails and provides an error
	message similar to the following::

	The extensible SDK can currently only be built for the same architecture as the machine being built on - SDK_ARCH is
	set to i686 (likely via setting SDKMACHINE) which is different from the architecture of the build machine (x86_64).
	Unable to continue.


	6. Build the SDK Installer: To build the SDK installer for a standard
	SDK and populate the SDK image, use the following command form. Be
	sure to replace ``image`` with an image (e.g. "core-image-sato")::

	$ bitbake image -c populate_sdk

	You can do the same for the extensible SDK using this command form::

	$ bitbake image -c populate_sdk_ext

	These commands produce an SDK installer that contains the sysroot
	that matches your target root filesystem.

	When the ``bitbake`` command completes, the SDK installer will be in
	``tmp/deploy/sdk`` in the Build Directory.

	.. note::

	- By default, the previous BitBake command does not build static
	binaries. If you want to use the toolchain to build these types
	of libraries, you need to be sure your SDK has the appropriate
	static development libraries. Use the
	:term:`TOOLCHAIN_TARGET_TASK`
	variable inside your ``local.conf`` file before building the
	SDK installer. Doing so ensures that the eventual SDK
	installation process installs the appropriate library packages
	as part of the SDK. Following is an example using ``libc``
	static development libraries: TOOLCHAIN_TARGET_TASK:append = "
	libc-staticdev"

	7. Run the Installer: You can now run the SDK installer from
	``tmp/deploy/sdk`` in the Build Directory. Following is an example::

	$ cd poky/build/tmp/deploy/sdk
	$ ./poky-glibc-x86_64-core-image-sato-core2-64-toolchain-ext-&DISTRO;.sh

	During execution of the script, you choose the root location for the
	toolchain. See the
	":ref:`sdk-manual/appendix-obtain:installed standard sdk directory structure`"
	section and the
	":ref:`sdk-manual/appendix-obtain:installed extensible sdk directory structure`"
	section for more information.

	Extracting the Root Filesystem
	==============================

	After installing the toolchain, for some use cases you might need to
	separately extract a root filesystem:

	- You want to boot the image using NFS.

	- You want to use the root filesystem as the target sysroot.

	- You want to develop your target application using the root filesystem
	as the target sysroot.

	Follow these steps to extract the root filesystem:

	1. *Locate and Download the Tarball for the Pre-Built Root Filesystem
	Image File:* You need to find and download the root filesystem image
	file that is appropriate for your target system. These files are kept
	in machine-specific folders in the
	:yocto_dl:`Index of Releases </releases/yocto/yocto-&DISTRO;/machines/>`
	in the "machines" directory.

	The machine-specific folders of the "machines" directory contain
	tarballs (``*.tar.bz2``) for supported machines. These directories
	also contain flattened root filesystem image files (``*.ext4``),
	which you can use with QEMU directly.

	The pre-built root filesystem image files follow these naming
	conventions::

	core-image-profile-arch.tar.bz2

	Where:
	profile is the filesystem image's profile:
	lsb, lsb-dev, lsb-sdk, minimal, minimal-dev, minimal-initramfs,
	sato, sato-dev, sato-sdk, sato-sdk-ptest. For information on
	these types of image profiles, see the "Images" chapter in
	the Yocto Project Reference Manual.

	arch is a string representing the target architecture:
	beaglebone-yocto, beaglebone-yocto-lsb, edgerouter, edgerouter-lsb,
	genericx86, genericx86-64, genericx86-64-lsb, genericx86-lsb and qemu*.

	The root filesystems
	provided by the Yocto Project are based off of the
	``core-image-sato`` and ``core-image-minimal`` images.

	For example, if you plan on using a BeagleBone device as your target
	hardware and your image is a ``core-image-sato-sdk`` image, you can
	download the following file::

	core-image-sato-sdk-beaglebone-yocto.tar.bz2

	2. Initialize the Cross-Development Environment: You must ``source``
	the cross-development environment setup script to establish necessary
	environment variables.

	This script is located in the top-level directory in which you
	installed the toolchain (e.g. ``poky_sdk``).

	Following is an example based on the toolchain installed in the
	":ref:`sdk-manual/appendix-obtain:locating pre-built sdk installers`" section::

	$ source poky_sdk/environment-setup-core2-64-poky-linux

	3. Extract the Root Filesystem: Use the ``runqemu-extract-sdk``
	command and provide the root filesystem image.

	Following is an example command that extracts the root filesystem
	from a previously built root filesystem image that was downloaded
	from the :yocto_dl:`Index of Releases </releases/yocto/yocto-&DISTRO;/machines/>`.
	This command extracts the root filesystem into the ``core2-64-sato``
	directory::

	$ runqemu-extract-sdk ~/Downloads/core-image-sato-sdk-beaglebone-yocto.tar.bz2 ~/beaglebone-sato

	You could now point to the target sysroot at ``beaglebone-sato``.

	Installed Standard SDK Directory Structure
	==========================================

	The following figure shows the resulting directory structure after you
	install the Standard SDK by running the ``*.sh`` SDK installation
	script:

	.. image:: figures/sdk-installed-standard-sdk-directory.png
	:scale: 100%

	The installed SDK consists of an environment setup script for the SDK, a
	configuration file for the target, a version file for the target, and
	the root filesystem (``sysroots``) needed to develop objects for the
	target system.

	Within the figure, italicized text is used to indicate replaceable
	portions of the file or directory name. For example, install_dir/version
	is the directory where the SDK is installed. By default, this directory
	is ``/opt/poky/``. And, version represents the specific snapshot of the
	SDK (e.g. &DISTRO;). Furthermore, target represents the target architecture
	(e.g. ``i586``) and host represents the development system's
	architecture (e.g. ``x86_64``). Thus, the complete names of the two
	directories within the ``sysroots`` could be ``i586-poky-linux`` and
	``x86_64-pokysdk-linux`` for the target and host, respectively.

	Installed Extensible SDK Directory Structure
	============================================

	The following figure shows the resulting directory structure after you
	install the Extensible SDK by running the ``*.sh`` SDK installation
	script:

	.. image:: figures/sdk-installed-extensible-sdk-directory.png
	:scale: 80%
	:align: center

	The installed directory structure for the extensible SDK is quite
	different than the installed structure for the standard SDK. The
	extensible SDK does not separate host and target parts in the same
	manner as does the standard SDK. The extensible SDK uses an embedded
	copy of the OpenEmbedded build system, which has its own sysroots.

	Of note in the directory structure are an environment setup script for
	the SDK, a configuration file for the target, a version file for the
	target, and log files for the OpenEmbedded build system preparation
	script run by the installer and BitBake.

	Within the figure, italicized text is used to indicate replaceable
	portions of the file or directory name. For example, install_dir is the
	directory where the SDK is installed, which is ``poky_sdk`` by default,
	and target represents the target architecture (e.g. ``i586``).