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ref-manual: document KERNEL_SPLIT_MODULES variable

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This variable controls the kernel module spliting.

[YOCTO #15771]

(From yocto-docs rev: 85f8e5c799ef38c6dcca615d7cc6baff325df259)

Signed-off-by: Dixit Parmar <dixitparmar19@gmail.com>
Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
(cherry picked from commit 198179d9c6231b5934d4fb6ede716d1dcb1442bb)
Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
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Dixit Parmar 2025-06-21 12:44:34 +05:30 committed by Steve Sakoman
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documentation/ref-manual/variables.rst
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@ -5334,6 +5334,27 @@ system and gives an overview of their function and contents.
the :term:`KERNEL_PATH` variable. Both variables are common variables
used by external Makefiles to point to the kernel source directory.
:term:`KERNEL_SPLIT_MODULES`
When inheriting the :ref:`ref-classes-kernel-module-split` class, this
variable controls whether kernel modules are split into separate packages
or bundled into a single package.
For some use cases, a monolithic kernel module package
:term:`KERNEL_PACKAGE_NAME` that contains all modules built from the
kernel sources may be preferred to speed up the installation.
By default, this variable is set to ``1``, resulting in one package per
module. Setting it to any other value will generate a single monolithic
package containing all kernel modules.
.. note::
If :term:`KERNEL_SPLIT_MODULES` is set to 0, it is still possible to
install all kernel modules at once by adding ``kernel-modules`` (assuming
:term:`KERNEL_PACKAGE_NAME` is ``kernel-modules``) to :term:`IMAGE_INSTALL`.
The way it works is that a placeholder "kernel-modules" package will be
created and will depend on every other individual kernel module packages.
:term:`KERNEL_SRC`
The location of the kernel sources. This variable is set to the value
of the :term:`STAGING_KERNEL_DIR` within the :ref:`ref-classes-module`