diff options
Diffstat (limited to 'poky/documentation/kernel-dev')
| -rw-r--r-- | poky/documentation/kernel-dev/advanced.rst | 56 | ||||
| -rw-r--r-- | poky/documentation/kernel-dev/common.rst | 52 | ||||
| -rw-r--r-- | poky/documentation/kernel-dev/faq.rst | 2 | ||||
| -rw-r--r-- | poky/documentation/kernel-dev/maint-appx.rst | 2 |
4 files changed, 56 insertions, 56 deletions
diff --git a/poky/documentation/kernel-dev/advanced.rst b/poky/documentation/kernel-dev/advanced.rst index 0e745c375d..871ec8ae7b 100644 --- a/poky/documentation/kernel-dev/advanced.rst +++ b/poky/documentation/kernel-dev/advanced.rst @@ -46,15 +46,15 @@ linux-yocto recipe. Every linux-yocto style recipe must define the :term:`KMACHINE` variable. This -variable is typically set to the same value as the ``MACHINE`` variable, +variable is typically set to the same value as the :term:`MACHINE` variable, which is used by :term:`BitBake`. However, in some cases, the variable might instead refer to the -underlying platform of the ``MACHINE``. +underlying platform of the :term:`MACHINE`. -Multiple BSPs can reuse the same ``KMACHINE`` name if they are built +Multiple BSPs can reuse the same :term:`KMACHINE` name if they are built using the same BSP description. Multiple Corei7-based BSPs could share -the same "intel-corei7-64" value for ``KMACHINE``. It is important to -realize that ``KMACHINE`` is just for kernel mapping, while ``MACHINE`` +the same "intel-corei7-64" value for :term:`KMACHINE`. It is important to +realize that :term:`KMACHINE` is just for kernel mapping, while :term:`MACHINE` is the machine type within a BSP Layer. Even with this distinction, however, these two variables can hold the same value. See the ":ref:`kernel-dev/advanced:bsp descriptions`" section for more information. @@ -66,7 +66,7 @@ to indicate the branch. .. note:: - You can use the ``KBRANCH`` value to define an alternate branch typically + You can use the :term:`KBRANCH` value to define an alternate branch typically with a machine override as shown here from the ``meta-yocto-bsp`` layer:: KBRANCH_edgerouter = "standard/edgerouter" @@ -81,8 +81,8 @@ variables: :term:`LINUX_KERNEL_TYPE` defines the kernel type to be used in assembling the configuration. If -you do not specify a ``LINUX_KERNEL_TYPE``, it defaults to "standard". -Together with ``KMACHINE``, ``LINUX_KERNEL_TYPE`` defines the search +you do not specify a :term:`LINUX_KERNEL_TYPE`, it defaults to "standard". +Together with :term:`KMACHINE`, :term:`LINUX_KERNEL_TYPE` defines the search arguments used by the kernel tools to find the appropriate description within the kernel Metadata with which to build out the sources and configuration. The linux-yocto recipes define "standard", "tiny", and @@ -90,21 +90,21 @@ configuration. The linux-yocto recipes define "standard", "tiny", and section for more information on kernel types. During the build, the kern-tools search for the BSP description file -that most closely matches the ``KMACHINE`` and ``LINUX_KERNEL_TYPE`` +that most closely matches the :term:`KMACHINE` and :term:`LINUX_KERNEL_TYPE` variables passed in from the recipe. The tools use the first BSP description they find that matches both variables. If the tools cannot find a match, they issue a warning. -The tools first search for the ``KMACHINE`` and then for the -``LINUX_KERNEL_TYPE``. If the tools cannot find a partial match, they -will use the sources from the ``KBRANCH`` and any configuration +The tools first search for the :term:`KMACHINE` and then for the +:term:`LINUX_KERNEL_TYPE`. If the tools cannot find a partial match, they +will use the sources from the :term:`KBRANCH` and any configuration specified in the :term:`SRC_URI`. You can use the :term:`KERNEL_FEATURES` variable to include features (configuration fragments, patches, or both) -that are not already included by the ``KMACHINE`` and -``LINUX_KERNEL_TYPE`` variable combination. For example, to include a +that are not already included by the :term:`KMACHINE` and +:term:`LINUX_KERNEL_TYPE` variable combination. For example, to include a feature specified as "features/netfilter/netfilter.scc", specify:: KERNEL_FEATURES += "features/netfilter/netfilter.scc" @@ -116,7 +116,7 @@ specify:: KERNEL_FEATURES_append_qemux86 = " cfg/sound.scc" The value of -the entries in ``KERNEL_FEATURES`` are dependent on their location +the entries in :term:`KERNEL_FEATURES` are dependent on their location within the kernel Metadata itself. The examples here are taken from the ``yocto-kernel-cache`` repository. Each branch of this repository contains "features" and "cfg" subdirectories at the top-level. For more @@ -344,7 +344,7 @@ as how an additional feature description file is included with the Typically, features are less granular than configuration fragments and are more likely than configuration fragments and patches to be the types -of things you want to specify in the ``KERNEL_FEATURES`` variable of the +of things you want to specify in the :term:`KERNEL_FEATURES` variable of the Linux kernel recipe. See the ":ref:`kernel-dev/advanced:using kernel metadata in a recipe`" section earlier in the manual. @@ -509,12 +509,12 @@ description as meeting the criteria set by the recipe being built. This example supports the "beaglebone" machine for the "standard" kernel and the "arm" architecture. -Be aware that there is no hard link between the ``KTYPE`` variable and a kernel +Be aware that there is no hard link between the :term:`KTYPE` variable and a kernel type description file. Thus, if you do not have the kernel type defined in your kernel Metadata as it is here, you only need to ensure that the :term:`LINUX_KERNEL_TYPE` -variable in the kernel recipe and the ``KTYPE`` variable in the BSP +variable in the kernel recipe and the :term:`KTYPE` variable in the BSP description file match. To separate your kernel policy from your hardware configuration, you @@ -657,7 +657,7 @@ Notice again the three critical variables: :term:`KMACHINE`, :term:`KTYPE`, and :term:`KARCH`. Of these variables, only -``KTYPE`` has changed to specify the "tiny" kernel type. +:term:`KTYPE` has changed to specify the "tiny" kernel type. Kernel Metadata Location ======================== @@ -693,7 +693,7 @@ directory hierarchy below a linux-yocto recipe or for a Linux kernel recipe derived by copying and modifying ``oe-core/meta-skeleton/recipes-kernel/linux/linux-yocto-custom.bb`` to -a recipe in your layer, ``FILESEXTRAPATHS`` is typically set to +a recipe in your layer, :term:`FILESEXTRAPATHS` is typically set to ``${``\ :term:`THISDIR`\ ``}/${``\ :term:`PN`\ ``}``. See the ":ref:`kernel-dev/common:modifying an existing recipe`" section for more information. @@ -718,10 +718,10 @@ and fetches any files referenced in the ``.scc`` files by the ``include``, ``patch``, or ``kconf`` commands. Because of this, it is necessary to bump the recipe :term:`PR` value when changing the content of files not explicitly listed in the -``SRC_URI``. +:term:`SRC_URI`. If the BSP description is in recipe space, you cannot simply list the -``*.scc`` in the ``SRC_URI`` statement. You need to use the following +``*.scc`` in the :term:`SRC_URI` statement. You need to use the following form from your kernel append file:: SRC_URI_append_myplatform = " \ @@ -735,7 +735,7 @@ When stored outside of the recipe-space, the kernel Metadata files reside in a separate repository. The OpenEmbedded build system adds the Metadata to the build as a "type=kmeta" repository through the :term:`SRC_URI` variable. As an -example, consider the following ``SRC_URI`` statement from the +example, consider the following :term:`SRC_URI` statement from the ``linux-yocto_4.12.bb`` kernel recipe:: SRC_URI = "git://git.yoctoproject.org/linux-yocto-4.12.git;name=machine;branch=${KBRANCH}; \ @@ -744,20 +744,20 @@ example, consider the following ``SRC_URI`` statement from the ``${KMETA}``, in this context, is simply used to name the directory into which the Git fetcher places the Metadata. This behavior is no different -than any multi-repository ``SRC_URI`` statement used in a recipe (e.g. +than any multi-repository :term:`SRC_URI` statement used in a recipe (e.g. see the previous section). You can keep kernel Metadata in a "kernel-cache", which is a directory containing configuration fragments. As with any Metadata kept outside -the recipe-space, you simply need to use the ``SRC_URI`` statement with +the recipe-space, you simply need to use the :term:`SRC_URI` statement with the "type=kmeta" attribute. Doing so makes the kernel Metadata available during the configuration phase. -If you modify the Metadata, you must not forget to update the ``SRCREV`` +If you modify the Metadata, you must not forget to update the :term:`SRCREV` statements in the kernel's recipe. In particular, you need to update the ``SRCREV_meta`` variable to match the commit in the ``KMETA`` branch you wish to use. Changing the data in these branches and not updating the -``SRCREV`` statements to match will cause the build to fetch an older +:term:`SRCREV` statements to match will cause the build to fetch an older commit. Organizing Your Source @@ -820,7 +820,7 @@ patches into a feature. Once you have a new branch, you can set up your kernel Metadata to use the branch a couple different ways. In the recipe, you can specify the -new branch as the ``KBRANCH`` to use for the board as follows:: +new branch as the :term:`KBRANCH` to use for the board as follows:: KBRANCH = "mynewbranch" diff --git a/poky/documentation/kernel-dev/common.rst b/poky/documentation/kernel-dev/common.rst index f64cbab56c..de62df5b1f 100644 --- a/poky/documentation/kernel-dev/common.rst +++ b/poky/documentation/kernel-dev/common.rst @@ -70,7 +70,7 @@ section: :term:`MACHINE` variable is set to "qemux86-64", which is fine if you are building for the QEMU emulator in 64-bit mode. However, if you are not, you need to set the - ``MACHINE`` variable appropriately in your ``conf/local.conf`` file + :term:`MACHINE` variable appropriately in your ``conf/local.conf`` file found in the :term:`Build Directory` (i.e. ``poky/build`` in this example). @@ -248,7 +248,7 @@ section: :term:`MACHINE` variable is set to "qemux86-64", which is fine if you are building for the QEMU emulator in 64-bit mode. However, if you are not, you need to set the - ``MACHINE`` variable appropriately in your ``conf/local.conf`` file + :term:`MACHINE` variable appropriately in your ``conf/local.conf`` file found in the :term:`Build Directory` (i.e. ``poky/build`` in this example). @@ -474,7 +474,7 @@ variable as follows:: The path ``${``\ :term:`THISDIR`\ ``}/${``\ :term:`PN`\ ``}`` expands to "linux-yocto" in the current directory for this example. If you add any new files that modify the kernel recipe and you have -extended ``FILESPATH`` as described above, you must place the files in +extended :term:`FILESPATH` as described above, you must place the files in your layer in the following area:: your-layer/recipes-kernel/linux/linux-yocto/ @@ -553,7 +553,7 @@ the append file. For example, suppose you had some configuration options in a file called ``network_configs.cfg``. You can place that file inside a directory -named ``linux-yocto`` and then add a ``SRC_URI`` statement such as the +named ``linux-yocto`` and then add a :term:`SRC_URI` statement such as the following to the append file. When the OpenEmbedded build system builds the kernel, the configuration options are picked up and applied. :: @@ -563,7 +563,7 @@ the kernel, the configuration options are picked up and applied. To group related configurations into multiple files, you perform a similar procedure. Here is an example that groups separate configurations specifically for Ethernet and graphics into their own -files and adds the configurations by using a ``SRC_URI`` statement like +files and adds the configurations by using a :term:`SRC_URI` statement like the following in your append file:: SRC_URI += "file://myconfig.cfg \ @@ -643,7 +643,7 @@ following lines to the linux-yocto ``.bbappend`` file in your layer:: FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:" SRC_URI += "file://defconfig" -The ``SRC_URI`` tells the build system how to search +The :term:`SRC_URI` tells the build system how to search for the file, while the :term:`FILESEXTRAPATHS` extends the :term:`FILESPATH` @@ -684,7 +684,7 @@ with the following content (without indentation):: CONFIG_SERIAL_CORE_CONSOLE=y Next, include this -configuration fragment and extend the ``FILESPATH`` variable in your +configuration fragment and extend the :term:`FILESPATH` variable in your ``.bbappend`` file:: FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:" @@ -722,7 +722,7 @@ form:: KBUILD_DEFCONFIG_KMACHINE ?= "defconfig_file" Here is an example -that assigns the ``KBUILD_DEFCONFIG`` variable based on "raspberrypi2" +that assigns the :term:`KBUILD_DEFCONFIG` variable based on "raspberrypi2" and provides the path to the "in-tree" ``defconfig`` file to be used for a Raspberry Pi 2, which is based on the Broadcom 2708/2709 chipset:: @@ -734,7 +734,7 @@ Aside from modifying your kernel recipe and providing your own a kernel's ``linux-``\ `machine`\ ``.inc`` file). In other words, if the build system detects a statement that identifies an "out-of-tree" ``defconfig`` file, that statement will override your -``KBUILD_DEFCONFIG`` variable. +:term:`KBUILD_DEFCONFIG` variable. See the :term:`KBUILD_DEFCONFIG` @@ -1349,10 +1349,10 @@ be picked up and applied when the kernel is built:: SRC_URI += "file://myconfig.cfg" As mentioned earlier, you can group related configurations into multiple -files and name them all in the ``SRC_URI`` statement as well. For +files and name them all in the :term:`SRC_URI` statement as well. For example, you could group separate configurations specifically for Ethernet and graphics into their own files and add those by using a -``SRC_URI`` statement like the following in your append file:: +:term:`SRC_URI` statement like the following in your append file:: SRC_URI += "file://myconfig.cfg \ file://eth.cfg \ @@ -1628,11 +1628,11 @@ Here are some basic steps you can use to work with your own sources: appropriate for your project: - :term:`SRC_URI`: The - ``SRC_URI`` should specify a Git repository that uses one of the + :term:`SRC_URI` should specify a Git repository that uses one of the supported Git fetcher protocols (i.e. ``file``, ``git``, ``http``, - and so forth). The ``SRC_URI`` variable should also specify either + and so forth). The :term:`SRC_URI` variable should also specify either a ``defconfig`` file or some configuration fragment files. The - skeleton recipe provides an example ``SRC_URI`` as a syntax + skeleton recipe provides an example :term:`SRC_URI` as a syntax reference. - :term:`LINUX_VERSION`: @@ -1650,16 +1650,16 @@ Here are some basic steps you can use to work with your own sources: indicate to the OpenEmbedded build system that the recipe has changed. - - :term:`PV`: The default ``PV`` + - :term:`PV`: The default :term:`PV` assignment is typically adequate. It combines the - ``LINUX_VERSION`` with the Source Control Manager (SCM) revision + :term:`LINUX_VERSION` with the Source Control Manager (SCM) revision as derived from the :term:`SRCPV` variable. The combined results are a string with the following form:: 3.19.11+git1+68a635bf8dfb64b02263c1ac80c948647cc76d5f_1+218bd8d2022b9852c60d32f0d770931e3cf343e2 - While lengthy, the extra verbosity in ``PV`` helps ensure you are + While lengthy, the extra verbosity in :term:`PV` helps ensure you are using the exact sources from which you intend to build. - :term:`COMPATIBLE_MACHINE`: @@ -1773,7 +1773,7 @@ information to build modules. If your module ``Makefile`` uses a different variable, you might want to override the :ref:`ref-tasks-compile` step, or create a patch to the ``Makefile`` to work with the more typical -``KERNEL_SRC`` or ``KERNEL_PATH`` variables. +:term:`KERNEL_SRC` or :term:`KERNEL_PATH` variables. After you have prepared your recipe, you will likely want to include the module in your images. To do this, see the documentation for the @@ -1886,23 +1886,23 @@ build stops. Kernel features are the last elements processed for configuring and patching the kernel. Therefore, adding features in this manner is a way to enforce specific features are present and enabled without needing to do a full audit of any other layer's additions to the -``SRC_URI`` statement. +:term:`SRC_URI` statement. You add a kernel feature by providing the feature as part of the -``KERNEL_FEATURES`` variable and by providing the path to the feature's +:term:`KERNEL_FEATURES` variable and by providing the path to the feature's ``.scc`` file, which is relative to the root of the kernel Metadata. The OpenEmbedded build system searches all forms of kernel Metadata on the -``SRC_URI`` statement regardless of whether the Metadata is in the +:term:`SRC_URI` statement regardless of whether the Metadata is in the "kernel-cache", system kernel Metadata, or a recipe-space Metadata (i.e. part of the kernel recipe). See the ":ref:`kernel-dev/advanced:kernel metadata location`" section for additional information. -When you specify the feature's ``.scc`` file on the ``SRC_URI`` +When you specify the feature's ``.scc`` file on the :term:`SRC_URI` statement, the OpenEmbedded build system adds the directory of that ``.scc`` file along with all its subdirectories to the kernel feature search path. Because subdirectories are searched, you can reference a -single ``.scc`` file in the ``SRC_URI`` statement to reference multiple +single ``.scc`` file in the :term:`SRC_URI` statement to reference multiple kernel features. Consider the following example that adds the "test.scc" feature to the @@ -1910,7 +1910,7 @@ build. 1. *Create the Feature File:* Create a ``.scc`` file and locate it just as you would any other patch file, ``.cfg`` file, or fetcher item you - specify in the ``SRC_URI`` statement. + specify in the :term:`SRC_URI` statement. .. note:: @@ -1937,7 +1937,7 @@ build. a similarly named configuration fragment file ``test.cfg``. 2. *Add the Feature File to SRC_URI:* Add the ``.scc`` file to the - recipe's ``SRC_URI`` statement:: + recipe's :term:`SRC_URI` statement:: SRC_URI_append = " file://test.scc" @@ -1945,7 +1945,7 @@ build. appended to the existing path. 3. *Specify the Feature as a Kernel Feature:* Use the - ``KERNEL_FEATURES`` statement to specify the feature as a kernel + :term:`KERNEL_FEATURES` statement to specify the feature as a kernel feature:: KERNEL_FEATURES_append = " test.scc" diff --git a/poky/documentation/kernel-dev/faq.rst b/poky/documentation/kernel-dev/faq.rst index cffd1c4330..f0a7af37bb 100644 --- a/poky/documentation/kernel-dev/faq.rst +++ b/poky/documentation/kernel-dev/faq.rst @@ -68,7 +68,7 @@ How do I change the Linux kernel command line? ---------------------------------------------- The Linux kernel command line is -typically specified in the machine config using the ``APPEND`` variable. +typically specified in the machine config using the :term:`APPEND` variable. For example, you can add some helpful debug information doing the following:: diff --git a/poky/documentation/kernel-dev/maint-appx.rst b/poky/documentation/kernel-dev/maint-appx.rst index 3354de5f0c..d968c856f6 100644 --- a/poky/documentation/kernel-dev/maint-appx.rst +++ b/poky/documentation/kernel-dev/maint-appx.rst @@ -104,7 +104,7 @@ patch, or BSP: repository organized under the "Yocto Linux Kernel" heading in the :yocto_git:`Yocto Project Source Repositories <>`. - - Areas pointed to by ``SRC_URI`` statements found in kernel recipes. + - Areas pointed to by :term:`SRC_URI` statements found in kernel recipes. For a typical build, the target of the search is a feature description in an ``.scc`` file whose name follows this format (e.g. |