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ref-manual: add missing EXTERNAL_KERNEL_DEVICETREE variable

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This variable can be used to specify one or more compiled device tree or
device tree overlays to use in addition to the one compiled by the
kernel.

(From yocto-docs rev: 708514ea676246ddf251ad47c95442e8ec5c0e1f)

Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
(cherry picked from commit 6566ffceab3780dc5ecbfe26f786ebe6ff17e693)
Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
This commit is contained in:
Antonin Godard
2024-10-09 09:41:07 +02:00
committed by Steve Sakoman
parent 67fd2ee995
commit c786e869b8
1 changed files with 12 additions and 0 deletions
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documentation/ref-manual/variables.rst
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@@ -2307,6 +2307,18 @@ system and gives an overview of their function and contents.
:ref:`kernel-yocto <ref-classes-kernel-yocto>` class in
``meta/classes`` to see how the variable is used.
:term:`EXTERNAL_KERNEL_DEVICETREE`
When inheriting :ref:`ref-classes-kernel-fitimage` 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
overlays to use.
Using this variable is only useful when you are using a kernel recipe
inheriting the :ref:`ref-classes-kernel` class, and which doesn't
already set a local version. Therefore, setting this variable has no
impact on ``linux-yocto`` kernels.
:term:`EXTERNAL_TOOLCHAIN`
When you intend to use an
:ref:`external toolchain <dev-manual/external-toolchain:optionally using an external toolchain>`,