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doc: add EXTRA_DTC_OVERLAY_FILE to list of important build variables
The EXTRA_DTC_OVERLAY_FILE is also an important build system variable, therefore add it to the list and give a brief description. Signed-off-by: Torsten Rasmussen <[email protected]>
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doc/develop/application/index.rst

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See :ref:`set-devicetree-overlays` for examples and :ref:`devicetree-intro`
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for information about devicetree and Zephyr.
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* :makevar:`EXTRA_DTC_OVERLAY_FILE`: Additional devicetree overlay files to use.
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Multiple files can be separated with semicolons. This can be useful to leave
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:makevar:`DTC_OVERLAY_FILE` at its default value, but "mix in" some additional
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overlay files.
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* :makevar:`SHIELD`: see :ref:`shields`
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* :makevar:`ZEPHYR_MODULES`: A `CMake list`_ containing absolute paths of

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