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Introducing Arm FF-A driver with MM communication support

Abdellatif El Khlifi requested to merge WIP/2021-12-03-FFA-transport-driver into master

This MR provides the following new features:

  • The FF-A low-level driver implementing Arm Firmware Framework for Armv8-A (FF-A)
  • MM communication using FF-A (compatible with StandaloneMM and smm-gateway)
  • A new armffa command
  • A test module to test the FF-A helper functions to communicate with secure world.

The above features are generic and do not depend on any platform.

These features have been tested on Corstone-1000 platform as a use case.

For more details on how a platform can use the driver please refer to this patch:

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