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-rw-r--r--docs/getting_started/build-options.rst5
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diff --git a/docs/getting_started/build-options.rst b/docs/getting_started/build-options.rst
index 031836a81..8854a7989 100644
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+++ b/docs/getting_started/build-options.rst
@@ -578,6 +578,11 @@ Common build options
exposing a virtual filesystem interface through BL31 as a SiP SMC function.
Default is 0.
+- ``USE_FCONF_BASED_IO``: This flag determines whether to use IO based on the
+ firmware configuration framework. This allows moving the io_policies into a
+ configuration device tree, instead of static structure in the code base.
+
+
- ``USE_ROMLIB``: This flag determines whether library at ROM will be used.
This feature creates a library of functions to be placed in ROM and thus
reduces SRAM usage. Refer to :ref:`Library at ROM` for further details. Default