doc/opal-api: Document using stdout-path property
@@ -19,6 +19,7 @@ Device Tree
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- ``/ibm,opal/`` compatible property now just lists ``ibm,opal-v3`` and no longer ``ibm,opal-v2`` (power9 and above only)
+- Use only ``stdout-path`` property from POWER9 and above as usage of ``linux,stdout-path`` is deprecated
- Rename ``fsp-ipl-side`` as ``sp-ipl-side`` in ``/ipl-params``
TODO
