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doc: application: document OVERLAY_CONFIG

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This is a really useful CMake variable that can be used to preserve
the default CONF_FILE value, but "mix in" additional content.

Signed-off-by: Martí Bolívar <marti.bolivar@nordicsemi.no>
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Martí Bolívar 2020-09-15 13:17:30 -07:00 • committed by Anas Nashif
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doc/application/index.rst
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@ -266,13 +266,18 @@ should know about.
built-in boards, and :ref:`board_porting_guide` for information on
adding board support.
* :makevar:`CONF_FILE`: Indicates the name of one or more configuration
* :makevar:`CONF_FILE`: Indicates the name of one or more Kconfig configuration
fragment files. Multiple filenames can be separated with either spaces or
semicolons. Each file includes Kconfig configuration values that override
the default configuration values.
See :ref:`initial-conf` for more information.
* :makevar:`OVERLAY_CONFIG`: Additional Kconfig configuration fragment files.
Multiple filenames can be separated with either spaces or semicolons. This
can be useful in order to leave :makevar:`CONF_FILE` at its default value,
but "mix in" some additional configuration options.
* :makevar:`DTC_OVERLAY_FILE`: One or more devicetree overlay files to use.
Multiple files can be separated with semicolons.
See :ref:`set-devicetree-overlays` for examples and :ref:`devicetree-intro`