ref-manual: replace kernel-fitimage by kernel-fit-image

(From yocto-docs rev: 93c92dd2837708ba00a4ca47667e60d7bb09430b)

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

2 files changed, 179 insertions, 100 deletions

diff --git a/documentation/ref-manual/classes.rst b/documentation/ref-manual/classes.rst
index da2bd028d8..f2f6e6e411 100644
--- a/documentation/ref-manual/classes.rst
+++ b/documentation/ref-manual/classes.rst
@@ -1732,77 +1732,158 @@ Its behavior is mainly controlled by the following variables:
 -  :term:`KERNEL_DTC_FLAGS`: flags for ``dtc``, the Device Tree Compiler
 -  :term:`KERNEL_PACKAGE_NAME`: base name of the kernel packages
 
-.. _ref-classes-kernel-fitimage:
+.. _ref-classes-kernel-fit-image:
 
-``kernel-fitimage``
-===================
+``kernel-fit-image``
+====================
 
-The :ref:`ref-classes-kernel-fitimage` class provides support to pack a kernel image,
-device trees, a U-boot script, an :term:`Initramfs` bundle and a RAM disk
-into a single FIT image. In theory, a FIT image can support any number
-of kernels, U-boot scripts, :term:`Initramfs` bundles, RAM disks and device-trees.
-However, :ref:`ref-classes-kernel-fitimage` currently only supports
+The :ref:`ref-classes-kernel-fit-image` class provides support to pack a kernel image,
+device trees, a U-boot script, and an :term:`Initramfs` into a single FIT image.
+In theory, a FIT image can support any number of kernels, U-boot scripts,
+:term:`Initramfs`, and device trees.
+However, :ref:`ref-classes-kernel-fit-image` currently only supports
 limited usecases: just one kernel image, an optional U-boot script,
-an optional :term:`Initramfs` bundle, an optional RAM disk, and any number of
-device trees.
-
-To create a FIT image, it is required that :term:`KERNEL_CLASSES`
-is set to include ":ref:`ref-classes-kernel-fitimage`" and one of :term:`KERNEL_IMAGETYPE`,
-:term:`KERNEL_ALT_IMAGETYPE` or :term:`KERNEL_IMAGETYPES` to include "fitImage".
-
-The options for the device tree compiler passed to ``mkimage -D``
-when creating the FIT image are specified using the
-:term:`UBOOT_MKIMAGE_DTCOPTS` variable.
-
-Only a single kernel can be added to the FIT image created by
-:ref:`ref-classes-kernel-fitimage` and the kernel image in FIT is mandatory. The
-address where the kernel image is to be loaded by U-Boot is
-specified by :term:`UBOOT_LOADADDRESS` and the entrypoint by
-:term:`UBOOT_ENTRYPOINT`. Setting :term:`FIT_ADDRESS_CELLS` to "2"
-is necessary if such addresses are 64 bit ones.
-
-Multiple device trees can be added to the FIT image created by
-:ref:`ref-classes-kernel-fitimage` and the device tree is optional.
-The address where the device tree is to be loaded by U-Boot is
-specified by :term:`UBOOT_DTBO_LOADADDRESS` for device tree overlays
-and by :term:`UBOOT_DTB_LOADADDRESS` for device tree binaries.
-
-Only a single RAM disk can be added to the FIT image created by
-:ref:`ref-classes-kernel-fitimage` and the RAM disk in FIT is optional.
-The address where the RAM disk image is to be loaded by U-Boot
-is specified by :term:`UBOOT_RD_LOADADDRESS` and the entrypoint by
-:term:`UBOOT_RD_ENTRYPOINT`. The ramdisk is added to the FIT image when
-:term:`INITRAMFS_IMAGE` is specified and requires that :term:`INITRAMFS_IMAGE_BUNDLE`
-is not set to 1.
-
-Only a single :term:`Initramfs` bundle can be added to the FIT image created by
-:ref:`ref-classes-kernel-fitimage` and the :term:`Initramfs` bundle in FIT is optional.
-In case of :term:`Initramfs`, the kernel is configured to be bundled with the root filesystem
-in the same binary (example: zImage-initramfs-:term:`MACHINE`.bin).
-When the kernel is copied to RAM and executed, it unpacks the :term:`Initramfs` root filesystem.
-The :term:`Initramfs` bundle can be enabled when :term:`INITRAMFS_IMAGE`
-is specified and requires that :term:`INITRAMFS_IMAGE_BUNDLE` is set to 1.
-The address where the :term:`Initramfs` bundle is to be loaded by U-boot is specified
-by :term:`UBOOT_LOADADDRESS` and the entrypoint by :term:`UBOOT_ENTRYPOINT`.
-
-Only a single U-boot boot script can be added to the FIT image created by
-:ref:`ref-classes-kernel-fitimage` and the boot script is optional.
-The boot script is specified in the ITS file as a text file containing
-U-boot commands. When using a boot script the user should configure the
-U-boot :ref:`ref-tasks-install` task to copy the script to sysroot.
-So the script can be included in the FIT image by the :ref:`ref-classes-kernel-fitimage`
-class. At run-time, U-boot CONFIG_BOOTCOMMAND define can be configured to
-load the boot script from the FIT image and execute it.
-
-The FIT image generated by the :ref:`ref-classes-kernel-fitimage` class is signed when the
-variables :term:`UBOOT_SIGN_ENABLE`, :term:`UBOOT_MKIMAGE_DTCOPTS`,
-:term:`UBOOT_SIGN_KEYDIR` and :term:`UBOOT_SIGN_KEYNAME` are set
-appropriately. The default values used for :term:`FIT_HASH_ALG` and
-:term:`FIT_SIGN_ALG` in :ref:`ref-classes-kernel-fitimage` are "sha256" and
-"rsa2048" respectively. The keys for signing the FIT image can be generated using
-the :ref:`ref-classes-kernel-fitimage` class when both :term:`FIT_GENERATE_KEYS` and
-:term:`UBOOT_SIGN_ENABLE` are set to "1".
-
+an optional :term:`Initramfs`, and any number of device trees.
+
+The FIT image is created by a recipe which inherits the
+:ref:`ref-classes-kernel-fit-image` class.
+One such example is the ``linux-yocto-fitimage`` recipe which creates a FIT
+image for the Linux Yocto kernel.
+Additionally, it is required that :term:`KERNEL_CLASSES` is set to include
+:ref:`ref-classes-kernel-fit-extra-artifacts`.
+The :ref:`ref-classes-kernel-fit-extra-artifacts` class exposes the required kernel
+artifacts to the :term:`DEPLOY_DIR_IMAGE` which are used by the
+:ref:`ref-classes-kernel-fit-image` class to create the FIT image.
+
+The simplest example for building a FIT image is to add::
+
+   KERNEL_CLASSES += "kernel-fit-extra-artifacts"
+
+to the machine :term:`configuration file` and to execute::
+
+   bitbake linux-yocto-fitimage
+
+This results in a ``fitImage`` file deployed to the :term:`DEPLOY_DIR_IMAGE`
+directory and a ``linux-yocto-fitimage`` package which can be installed.
+
+The same approach works for all variants of the ``linux-yocto`` kernel.
+For example, if the ``linux-yocto-rt`` kernel should be used, add the following
+lines to the machine configuration file::
+
+   KERNEL_CLASSES += "kernel-fit-extra-artifacts"
+   PREFERRED_PROVIDER_virtual/kernel = "linux-yocto-rt"
+
+The FIT image, this time including the RT kernel, is built again by calling::
+
+   bitbake linux-yocto-fitimage
+
+For other kernels provided by other layers, the same approach would work.
+However, it is usually more intuitive to add a custom FIT image recipe next to
+the custom kernel recipe.
+For example, if a layer provides a ``linux-vanilla`` recipe, a
+``linux-vanilla-fitimage`` recipe may be added as well.
+The ``linux-vanilla-fitimage`` recipe can be created as a customized copy of
+the ``linux-yocto-fitimage`` recipe.
+
+Usually the kernel is built as a dependency of an image.
+If the FIT image should be used as a replacement for the kernel image which
+is installed in the root filesystem, then the following variables can be set
+e.g. in the machine configuration file::
+
+   # Create and deploy the vmlinux artifact which gets included into the FIT image
+   KERNEL_CLASSES += "kernel-fit-extra-artifacts"
+
+   # Do not install the kernel image package
+   RRECOMMENDS:${KERNEL_PACKAGE_NAME}-base = ""
+   # Install the FIT image package
+   MACHINE_ESSENTIAL_EXTRA_RDEPENDS += "linux-yocto-fitimage"
+
+   # Configure the image.bbclass to depend on the FIT image instead of only
+   # the kernel to ensure the FIT image is built and deployed with the image
+   KERNEL_DEPLOY_DEPEND = "linux-yocto-fitimage:do_deploy"
+
+The :ref:`ref-classes-kernel-fit-image` class processes several variables that
+allow configuration:
+
+-  The options for the device tree compiler passed to ``mkimage -D``
+   when creating the FIT image are specified using the
+   :term:`UBOOT_MKIMAGE_DTCOPTS` variable.
+
+-  Only a single kernel can be added to the FIT image created by
+   :ref:`ref-classes-kernel-fit-image` and it is a mandatory component of the
+   FIT image.
+   The address where the kernel image is to be loaded by U-Boot is
+   specified by :term:`UBOOT_LOADADDRESS` and the entrypoint by
+   :term:`UBOOT_ENTRYPOINT`. Setting :term:`FIT_ADDRESS_CELLS` to "2"
+   is necessary if such addresses are 64 bit ones.
+
+-  Multiple device trees can be added to the FIT image created by
+   :ref:`ref-classes-kernel-fit-image` and the device tree is optional.
+   The address where the device tree is to be loaded by U-Boot is
+   specified by :term:`UBOOT_DTBO_LOADADDRESS` for device tree overlays
+   and by :term:`UBOOT_DTB_LOADADDRESS` for device tree binaries.
+
+-  Only a single :term:`Initramfs` can be added to the FIT image created by
+   :ref:`ref-classes-kernel-fit-image`. The :term:`Initramfs` in FIT is optional.
+   The address where the RAM disk image is to be loaded by U-Boot
+   is specified by :term:`UBOOT_RD_LOADADDRESS` and the entrypoint by
+   :term:`UBOOT_RD_ENTRYPOINT`. The :term:`Initramfs` is added to the FIT image
+   when :term:`INITRAMFS_IMAGE` is specified.
+
+-  It's recommended to add the :term:`Initramfs` and the kernel image as
+   independent image nodes to the FIT image.
+   Bundling a RAM disk image with the kernel image and including the bundle
+   (:term:`INITRAMFS_IMAGE_BUNDLE` set to "1") in the FIT image is possible.
+   However, this approach has the disadvantage that any change to the RAM
+   disk image necessitates rebuilding the kernel image.
+   This process requires the full kernel build directory, which is kind of
+   incompatible with the :term:`SSTATE_DIR` and, consequently, with SDKs.
+
+-  Only a single U-Boot boot script can be added to the FIT image created by
+   :ref:`ref-classes-kernel-fit-image`. The boot script is optional.
+   The boot script is specified in the ITS file as a text file containing
+   U-Boot commands. When using a boot script the recipe which inherits the
+   :ref:`ref-classes-kernel-fit-image` class should add the script to
+   :term:`SRC_URI` and set the :term:`FIT_UBOOT_ENV` variable to the name of the
+   file like the following::
+
+      FIT_UBOOT_ENV = "boot.txt"
+      SRC_URI += "file://${FIT_UBOOT_ENV}"
+
+   At run-time, U-boot's boot command can be configured to load the boot script
+   from the FIT image and source it.
+
+-  The FIT image generated by the :ref:`ref-classes-kernel-fit-image` class is signed when the
+   variables :term:`UBOOT_SIGN_ENABLE`, :term:`UBOOT_MKIMAGE_DTCOPTS`,
+   :term:`UBOOT_SIGN_KEYDIR` and :term:`UBOOT_SIGN_KEYNAME` are set
+   appropriately. The default values used for :term:`FIT_HASH_ALG` and
+   :term:`FIT_SIGN_ALG` in :ref:`ref-classes-kernel-fit-image` are "sha256" and
+   "rsa2048" respectively. The keys for signing the FIT image can be generated using
+   the :ref:`ref-classes-kernel-fit-image` class when both :term:`FIT_GENERATE_KEYS` and
+   :term:`UBOOT_SIGN_ENABLE` are set to "1".
+
+.. _ref-classes-kernel-fit-extra-artifacts:
+
+``kernel-fit-extra-artifacts``
+==============================
+
+The :ref:`ref-classes-kernel-fit-extra-artifacts` class exposes the required
+kernel artifacts to the :term:`DEPLOY_DIR_IMAGE` directory.
+These artifacts are used by the :ref:`ref-classes-kernel-fit-image` class to
+create a FIT image that can include the kernel, device trees, an optional
+U-Boot script, and an optional Initramfs.
+
+This class is typically included by adding it to the :term:`KERNEL_CLASSES`
+variable in your kernel recipe or machine configuration when building FIT images.
+It ensures that all necessary files are available for packaging into the FIT image,
+such as the kernel binary, device tree blobs (DTBs), and other related files.
+
+For example, to enable this class, set::
+
+   KERNEL_CLASSES += "kernel-fit-extra-artifacts"
+
+This is required when using the :ref:`ref-classes-kernel-fit-image` class to
+generate FIT images for your kernel.
 
 .. _ref-classes-kernel-grub:
 
@@ -3438,7 +3519,7 @@ See U-Boot's documentation for details about `verified boot
 and the `signature process
 <https://source.denx.de/u-boot/u-boot/-/blob/master/doc/uImage.FIT/signature.txt>`__.
 
-See also the description of :ref:`ref-classes-kernel-fitimage` class, which this class
+See also the description of :ref:`ref-classes-kernel-fit-image` class, which this class
 imitates.
 
 .. _ref-classes-uki:
diff --git a/documentation/ref-manual/variables.rst b/documentation/ref-manual/variables.rst
index 5c18b852d1..fd14274a13 100644
--- a/documentation/ref-manual/variables.rst
+++ b/documentation/ref-manual/variables.rst
@@ -2790,7 +2790,7 @@ system and gives an overview of their function and contents.
       ``meta/classes-recipe`` to see how the variable is used.
 
    :term:`EXTERNAL_KERNEL_DEVICETREE`
-      When inheriting :ref:`ref-classes-kernel-fitimage` and a
+      When inheriting :ref:`ref-classes-kernel-fit-image` and a
       :term:`PREFERRED_PROVIDER` for ``virtual/dtb`` set to ``devicetree``, the
       variable :term:`EXTERNAL_KERNEL_DEVICETREE` can be used to specify a
       directory containing one or more compiled device tree or device tree
@@ -3318,7 +3318,7 @@ system and gives an overview of their function and contents.
       Specifies the value of the ``#address-cells`` value for the
       description of the FIT image.
 
-      The default value is set to "1" by the :ref:`ref-classes-kernel-fitimage`
+      The default value is set to "1" by the :ref:`ref-classes-kernel-fit-image`
       class, which corresponds to 32 bit addresses.
 
       For platforms that need to set 64 bit addresses, for example in
@@ -3337,11 +3337,11 @@ system and gives an overview of their function and contents.
       Specifies the default device tree binary (dtb) file for a FIT image
       when multiple ones are provided.
 
-      This variable is used in the :ref:`ref-classes-kernel-fitimage` class.
+      This variable is used in the :ref:`ref-classes-kernel-fit-image` class.
 
    :term:`FIT_DESC`
       Specifies the description string encoded into a FIT image. The
-      default value is set by the :ref:`ref-classes-kernel-fitimage` class as
+      default value is set by the :ref:`ref-classes-kernel-fit-image` class as
       follows::
 
          FIT_DESC ?= "U-Boot fitImage for ${DISTRO_NAME}/${PV}/${MACHINE}"
@@ -3350,12 +3350,12 @@ system and gives an overview of their function and contents.
       Decides whether to generate the keys for signing the FIT image if
       they don't already exist. The keys are created in
       :term:`UBOOT_SIGN_KEYDIR`. The default value is set to "0"
-      by the :ref:`ref-classes-kernel-fitimage` class.
+      by the :ref:`ref-classes-kernel-fit-image` class.
 
    :term:`FIT_HASH_ALG`
       Specifies the hash algorithm used in creating the FIT Image.
       This variable is set by default to "sha256" by the
-      :ref:`ref-classes-kernel-fitimage` class.
+      :ref:`ref-classes-kernel-fit-image` class.
 
    :term:`FIT_KERNEL_COMP_ALG`
       The compression algorithm to use for the kernel image inside the FIT Image.
@@ -3374,31 +3374,31 @@ system and gives an overview of their function and contents.
    :term:`FIT_KEY_GENRSA_ARGS`
       Arguments to ``openssl genrsa`` for generating a RSA private key for
       signing the FIT image. The default value is set to "-F4" by the
-      :ref:`ref-classes-kernel-fitimage` class.
+      :ref:`ref-classes-kernel-fit-image` class.
 
    :term:`FIT_KEY_REQ_ARGS`
       Arguments to ``openssl req`` for generating a certificate for signing
       the FIT image. The default value is "-batch -new" by the
-      :ref:`ref-classes-kernel-fitimage` class, "batch" for
+      :ref:`ref-classes-kernel-fit-image` class, "batch" for
       non interactive mode and "new" for generating new keys.
 
    :term:`FIT_KEY_SIGN_PKCS`
       Format for the public key certificate used for signing the FIT image.
       The default value is set to "x509" by the
-      :ref:`ref-classes-kernel-fitimage` class.
+      :ref:`ref-classes-kernel-fit-image` class.
 
    :term:`FIT_SIGN_ALG`
       Specifies the signature algorithm used in creating the FIT Image.
       This variable is set by default to "rsa2048" by the
-      :ref:`ref-classes-kernel-fitimage` class.
+      :ref:`ref-classes-kernel-fit-image` class.
 
    :term:`FIT_PAD_ALG`
       Specifies the padding algorithm used in creating the FIT Image.
       The default value is set to "pkcs-1.5" by the
-      :ref:`ref-classes-kernel-fitimage` class.
+      :ref:`ref-classes-kernel-fit-image` class.
 
    :term:`FIT_SIGN_INDIVIDUAL`
-      If set to "1", the :ref:`ref-classes-kernel-fitimage` class signs each
+      If set to "1", the :ref:`ref-classes-kernel-fit-image` class signs each
       image node individually, including the kernel, DTB, RAM disk, and any
       other image types present in the FIT image, in addition to signing the
       configuration nodes.
@@ -3431,13 +3431,13 @@ system and gives an overview of their function and contents.
    :term:`FIT_SIGN_NUMBITS`
       Size of the private key used in the FIT image, in number of bits.
       The default value for this variable is set to "2048"
-      by the :ref:`ref-classes-kernel-fitimage` class.
+      by the :ref:`ref-classes-kernel-fit-image` class.
 
    :term:`FIT_UBOOT_ENV`
       This variable allows to add a U-Boot script as a text file to the
       FIT image. Such a script can be sourced from the U-Boot shell.
 
-      When inheriting the :ref:`ref-classes-kernel-fitimage` class a
+      When inheriting the :ref:`ref-classes-kernel-fit-image` class a
       script file should be included in the :term:`SRC_URI` of the Linux
       kernel recipe.
 
@@ -5075,9 +5075,7 @@ system and gives an overview of their function and contents.
    :term:`KERNEL_CLASSES`
       A list of classes defining kernel image types that the
       :ref:`ref-classes-kernel` class should inherit. You typically
-      append this variable to enable extended image types. An example is
-      ":ref:`ref-classes-kernel-fitimage`", which enables
-      FIT image support and resides in ``meta/classes-recipe/kernel-fitimage.bbclass``.
+      append this variable to enable extended image types.
       You can register custom kernel image types with the
       :ref:`ref-classes-kernel` class using this variable.
 
@@ -10321,13 +10319,13 @@ system and gives an overview of their function and contents.
    :term:`UBOOT_DTB_LOADADDRESS`
       Specifies the load address for the dtb image used by U-Boot. During FIT
       image creation, the :term:`UBOOT_DTB_LOADADDRESS` variable is used in
-      :ref:`ref-classes-kernel-fitimage` class to specify the load address to be
+      :ref:`ref-classes-kernel-fit-image` class to specify the load address to be
       used in creating the dtb sections of Image Tree Source for the FIT image.
 
    :term:`UBOOT_DTBO_LOADADDRESS`
       Specifies the load address for the dtbo image used by U-Boot.  During FIT
       image creation, the :term:`UBOOT_DTBO_LOADADDRESS` variable is used in
-      :ref:`ref-classes-kernel-fitimage` class to specify the load address to be
+      :ref:`ref-classes-kernel-fit-image` class to specify the load address to be
       used in creating the dtbo sections of Image Tree Source for the FIT image.
 
    :term:`UBOOT_ENTRYPOINT`
@@ -10339,7 +10337,7 @@ system and gives an overview of their function and contents.
       -  The :term:`FIT_ADDRESS_CELLS` variable for FIT image creation.
       -  The :term:`UBOOT_FIT_ADDRESS_CELLS` variable for U-Boot FIT image creation.
 
-      This variable is used by the :ref:`ref-classes-kernel-fitimage`,
+      This variable is used by the :ref:`ref-classes-kernel-fit-image`,
       :ref:`ref-classes-kernel-uimage`, :ref:`ref-classes-kernel`,
       :ref:`ref-classes-uboot-config` and :ref:`ref-classes-uboot-sign`
       classes.
@@ -10616,7 +10614,7 @@ system and gives an overview of their function and contents.
       -  The :term:`FIT_ADDRESS_CELLS` variable for FIT image creation.
       -  The :term:`UBOOT_FIT_ADDRESS_CELLS` variable for U-Boot FIT image creation.
 
-      This variable is used by the :ref:`ref-classes-kernel-fitimage`,
+      This variable is used by the :ref:`ref-classes-kernel-fit-image`,
       :ref:`ref-classes-kernel-uimage`, :ref:`ref-classes-kernel`,
       :ref:`ref-classes-uboot-config` and :ref:`ref-classes-uboot-sign`
       classes.
@@ -10644,15 +10642,15 @@ system and gives an overview of their function and contents.
 
    :term:`UBOOT_MKIMAGE`
       Specifies the name of the mkimage command as used by the
-      :ref:`ref-classes-kernel-fitimage` class to assemble
+      :ref:`ref-classes-kernel-fit-image` class to assemble
       the FIT image. This can be used to substitute an alternative command, wrapper
       script or function if desired. The default is "uboot-mkimage".
 
    :term:`UBOOT_MKIMAGE_DTCOPTS`
       Options for the device tree compiler passed to ``mkimage -D`` feature
-      while creating a FIT image with the :ref:`ref-classes-kernel-fitimage`
+      while creating a FIT image with the :ref:`ref-classes-kernel-fit-image`
       class. If :term:`UBOOT_MKIMAGE_DTCOPTS` is not set then the
-      :ref:`ref-classes-kernel-fitimage` class will not pass the ``-D`` option
+      :ref:`ref-classes-kernel-fit-image` class will not pass the ``-D`` option
       to ``mkimage``.
 
       This variable is also used by the :ref:`ref-classes-uboot-sign` class.
@@ -10663,42 +10661,42 @@ system and gives an overview of their function and contents.
 
    :term:`UBOOT_MKIMAGE_SIGN`
       Specifies the name of the mkimage command as used by the
-      :ref:`ref-classes-kernel-fitimage` class to sign
+      :ref:`ref-classes-kernel-fit-image` class to sign
       the FIT image after it has been assembled (if enabled). This can be used
       to substitute an alternative command, wrapper script or function if
       desired. The default is "${:term:`UBOOT_MKIMAGE`}".
 
    :term:`UBOOT_MKIMAGE_SIGN_ARGS`
       Optionally specifies additional arguments for the
-      :ref:`ref-classes-kernel-fitimage` class to pass to the
+      :ref:`ref-classes-kernel-fit-image` class to pass to the
       mkimage command when signing the FIT image.
 
    :term:`UBOOT_RD_ENTRYPOINT`
       Specifies the entrypoint for the RAM disk image. During FIT image
       creation, the :term:`UBOOT_RD_ENTRYPOINT` variable is used in
-      :ref:`ref-classes-kernel-fitimage` class to specify the entrypoint to be
+      :ref:`ref-classes-kernel-fit-image` class to specify the entrypoint to be
       used in creating the Image Tree Source for the FIT image.
 
    :term:`UBOOT_RD_LOADADDRESS`
       Specifies the load address for the RAM disk image. During FIT image
       creation, the :term:`UBOOT_RD_LOADADDRESS` variable is used in
-      :ref:`ref-classes-kernel-fitimage` class to specify the load address to
+      :ref:`ref-classes-kernel-fit-image` class to specify the load address to
       be used in creating the Image Tree Source for the FIT image.
 
    :term:`UBOOT_SIGN_ENABLE`
       Enable signing of FIT image. The default value is "0".
 
-      This variable is used by the :ref:`ref-classes-kernel-fitimage`,
+      This variable is used by the :ref:`ref-classes-kernel-fit-image`,
       :ref:`ref-classes-uboot-config` and :ref:`ref-classes-uboot-sign`
       classes.
 
    :term:`UBOOT_SIGN_KEYDIR`
       Location of the directory containing the RSA key and certificate used for
-      signing FIT image, used by the :ref:`ref-classes-kernel-fitimage` and
+      signing FIT image, used by the :ref:`ref-classes-kernel-fit-image` and
       :ref:`ref-classes-uboot-sign` classes.
 
    :term:`UBOOT_SIGN_KEYNAME`
-      The name of keys used by the :ref:`ref-classes-kernel-fitimage` class
+      The name of keys used by the :ref:`ref-classes-kernel-fit-image` class
       for signing U-Boot FIT image stored in the :term:`UBOOT_SIGN_KEYDIR`
       directory. If we have for example a ``dev.key`` key and a ``dev.crt``
       certificate stored in the :term:`UBOOT_SIGN_KEYDIR` directory, you will