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vstehle merged 2 commits into from
Mar 13, 2025
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Require FF-A compatibility with v1.2 #138

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references: add reference to the FF-A specification
vstehle Feb 13, 2025
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chapter3: require FF-A compatible with v1.2
vstehle Feb 13, 2025
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18 changes: 18 additions & 0 deletions source/chapter3-secureworld.rst
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Expand Up @@ -38,6 +38,24 @@ It is recommended that firmware implements PSCI version 1.0 or later
.. warning:: A future version of this specification will require minimum PSCI
and SMCCC versions.

AArch64 Firmware Framework
==========================

On AArch64 platforms, when privileged or secure firmware implements the Firmware
Framework for A-profile (FF-A), it must conform to the Arm Firmware Framework
for Arm A-profile specification [FFA]_ and it must support at least one callee
version compatible with caller version 1.2. [#FFANote]_

.. [#FFANote] FF-A is an Arm software architecture describing interfaces that
standardize communication between software images and firmware, in the Secure
world and the Normal world.
FF-A v1.2 introduced support for multiple services UUIDs in a partition,
which eases services discovery, as well as the supporting
`FFA_MSG_SEND_DIRECT_REQ2` ABI.
As per the FF-A specification § 13.2 FFA_VERSION, all callee versions 1.x,
with x >= 2, are compatible with caller versions 1.0 to 1.x, which includes
caller version 1.2.

RISC-V Multiprocessor Startup Protocol
======================================

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4 changes: 4 additions & 0 deletions source/references.rst
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Expand Up @@ -29,6 +29,10 @@ Bibliography
<https://github.com/devicetree-org/devicetree-specification/releases/tag/v0.4>`_,
`Devicetree.org <https://www.devicetree.org/>`_

.. [FFA] `Arm Firmware Framework for Arm A-profile v1.3 ALP1
<https://developer.arm.com/documentation/den0077/l>`_
November 2024, `Arm Limited <https://www.arm.com/>`_

.. [PSCI] `Arm Power State Coordination Interface issue F.b (PSCI v1.3).
<https://developer.arm.com/documentation/den0022/fb>`_
October 2024, `Arm Limited <https://www.arm.com/>`_
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