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7 Exception Levels. For features with EL3 controls, it is relatively straightforward to examine the
8 code and determine whether TF-A support them. However, for features that are transparent to EL3, it
473 If it is defined to 1, the code will use the feature unconditionally, so the CPU
478 but its existence will be checked at runtime, so it works on CPUs with or
488 a) a feature is added to the architecture and it includes controls at EL3
503   - Add it to the ``assert_numerics`` and ``add_defines`` lists in the
506   - Add a default of ``0`` for it in ``make_helpers/arch_features.mk``. If the
508     add it to the appropriate list at the top of the same file.
521     code is to use it, a corresponding AArch32 version should be provided. It
559   can take, the default, and that it conforms to the ``ENABLE_FEAT`` mechanism.
564   setting it to ``2`` (``FEAT_STATE_CHECKED``).
566 - If the feature is optional, enable it in CI in the "allconfig" fragments.