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Diffstat (limited to 'docs/design/firmware-design.rst')
| -rw-r--r-- | docs/design/firmware-design.rst | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/docs/design/firmware-design.rst b/docs/design/firmware-design.rst index c12e73f45..0831dc056 100644 --- a/docs/design/firmware-design.rst +++ b/docs/design/firmware-design.rst @@ -26,6 +26,13 @@ tables. The details of this library can be found in TF-A can be built to support either AArch64 or AArch32 execution state. +.. note:: + + The descriptions in this chapter are for the Arm TrustZone architecture. + For changes to the firmware design for the + `Arm Confidential Compute Architecture (Arm CCA)`_ please refer to the + chapter :ref:`Realm Management Extension (RME)`. + Cold boot --------- @@ -2616,8 +2623,6 @@ Armv8.3-A ``CTX_INCLUDE_PAUTH_REGS`` to 1. This enables pointer authentication in BL1, BL2, BL31, and the TSP if it is used. - These options are experimental features. - Note that Pointer Authentication is enabled for Non-secure world irrespective of the value of these build flags if the CPU supports it. @@ -2629,8 +2634,7 @@ Armv8.5-A ~~~~~~~~~ - Branch Target Identification feature is selected by ``BRANCH_PROTECTION`` - option set to 1. This option defaults to 0 and this is an experimental - feature. + option set to 1. This option defaults to 0. - Memory Tagging Extension feature is unconditionally enabled for both worlds (at EL0 and S-EL0) if it is only supported at EL0. If instead it is @@ -2725,7 +2729,7 @@ kernel at boot time. These can be found in the ``fdts`` directory. -------------- -*Copyright (c) 2013-2020, Arm Limited and Contributors. All rights reserved.* +*Copyright (c) 2013-2021, Arm Limited and Contributors. All rights reserved.* .. _Power State Coordination Interface PDD: http://infocenter.arm.com/help/topic/com.arm.doc.den0022d/Power_State_Coordination_Interface_PDD_v1_1_DEN0022D.pdf .. _SMCCC: https://developer.arm.com/docs/den0028/latest @@ -2734,5 +2738,6 @@ kernel at boot time. These can be found in the ``fdts`` directory. .. _Arm ARM: https://developer.arm.com/docs/ddi0487/latest .. _SMC Calling Convention: https://developer.arm.com/docs/den0028/latest .. _Trusted Board Boot Requirements CLIENT (TBBR-CLIENT) Armv8-A (ARM DEN0006D): https://developer.arm.com/docs/den0006/latest/trusted-board-boot-requirements-client-tbbr-client-armv8-a +.. _Arm Confidential Compute Architecture (Arm CCA): https://www.arm.com/why-arm/architecture/security-features/arm-confidential-compute-architecture .. |Image 1| image:: ../resources/diagrams/rt-svc-descs-layout.png |