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+POWER9 Changes to OPAL API
+--------------------------
+
+This document is a summary of POWER9 changes to the OPAL API over what it
+was for POWER7 and POWER8. As the POWER series of processors (at least up
+to POWER9) require changes in the hypervisor to work on a new processor
+generation, this gives us an opportunity with POWER9 to clean up several
+parts of the OPAL API.
+
+Eventually, when the kernel drops support for POWER8 and before, we can then
+remove the associated kernel code too.
+
+
+TODO
+----
+Things we still have to do for POWER9:
+- remove opal-v2 from compatible string.
+- PCI to use async API rather than returning delays
+- deprecate/remove v1 APIs where there's a V2
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