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+Feature Overview
+================
+
+This page provides an overview of the current |TF-A| feature set. For a full
+description of these features and their implementation details, please see
+the documents that are part of the *Components* and *System Design* chapters.
+
+The :ref:`Change Log & Release Notes` provides details of changes made since the
+last release.
+
+Current features
+----------------
+
+-  Initialization of the secure world, for example exception vectors, control
+   registers and interrupts for the platform.
+
+-  Library support for CPU specific reset and power down sequences. This
+   includes support for errata workarounds and the latest Arm DynamIQ CPUs.
+
+-  Drivers to enable standard initialization of Arm System IP, for example
+   Generic Interrupt Controller (GIC), Cache Coherent Interconnect (CCI),
+   Cache Coherent Network (CCN), Network Interconnect (NIC) and TrustZone
+   Controller (TZC).
+
+-  Secure Monitor library code such as world switching, EL2/EL1 context
+   management and interrupt routing.
+
+-  SMC (Secure Monitor Call) handling, conforming to the `SMC Calling
+   Convention`_ using an EL3 runtime services framework.
+
+-  |PSCI| library support for CPU, cluster and system power management
+   use-cases.
+   This library is pre-integrated with the AArch64 EL3 Runtime Software, and
+   is also suitable for integration with other AArch32 EL3 Runtime Software,
+   for example an AArch32 Secure OS.
+
+-  A generic |SCMI| driver to interface with conforming power controllers, for
+   example the Arm System Control Processor (SCP).
+
+-  A minimal AArch32 Secure Payload (*SP_MIN*) to demonstrate |PSCI| library
+   integration with AArch32 EL3 Runtime Software.
+
+-  Secure partition manager dispatcher(SPMD) with following two configurations:
+
+   -  S-EL2 SPMC implementation, widely compliant with FF-A v1.1 EAC0 and initial
+      support of FF-A v1.2.
+
+   -  EL3 SPMC implementation, compliant with a subset of FF-A v1.1 EAC0.
+
+-  Support for Arm CCA based on FEAT_RME which supports authenticated boot and
+   execution of RMM with the necessary routing of RMI commands as specified in
+   RMM Beta 0 Specification.
+
+-  A Test SP and SPD to demonstrate AArch64 Secure Monitor functionality and SP
+   interaction with PSCI.
+
+-  SPDs for the `OP-TEE Secure OS`_, `NVIDIA Trusted Little Kernel`_,
+   `Trusty Secure OS`_ and `ProvenCore Secure OS`_.
+
+-  A Trusted Board Boot implementation, conforming to all mandatory TBBR
+   requirements. This includes image authentication, Firmware recovery,
+   Firmware encryption and packaging of the various firmware images into a
+   Firmware Image Package (FIP).
+
+-  Measured boot support with PoC to showcase its interaction with firmware TPM
+   (fTPM) service implemneted on top of OP-TEE.
+
+-  Support for Dynamic Root of Trust for Measurement (DRTM).
+
+-  Following firmware update mechanisms available:
+
+   -  PSA Firmware Update (PSA FWU)
+
+   -  TBBR Firmware Update (TBBR FWU)
+
+-  Reliability, Availability, and Serviceability (RAS) functionality, including
+
+   -  A Secure Partition Manager (SPM) to manage Secure Partitions in
+      Secure-EL0, which can be used to implement simple management and
+      security services.
+
+   -  An |SDEI| dispatcher to route interrupt-based |SDEI| events.
+
+   -  An Exception Handling Framework (EHF) that allows dispatching of EL3
+      interrupts to their registered handlers, to facilitate firmware-first
+      error handling.
+
+-  A dynamic configuration framework that enables each of the firmware images
+   to be configured at runtime if required by the platform. It also enables
+   loading of a hardware configuration (for example, a kernel device tree)
+   as part of the FIP, to be passed through the firmware stages.
+   This feature is now incorporated inside the firmware configuration framework
+   (fconf).
+
+-  Support for alternative boot flows, for example to support platforms where
+   the EL3 Runtime Software is loaded using other firmware or a separate
+   secure system processor, or where a non-TF-A ROM expects BL2 to be loaded
+   at EL3.
+
+-  Support for Errata management firmware interface.
+
+-  Support for the GCC, LLVM and Arm Compiler 6 toolchains.
+
+-  Support for combining several libraries into a "romlib" image that may be
+   shared across images to reduce memory footprint. The romlib image is stored
+   in ROM but is accessed through a jump-table that may be stored
+   in read-write memory, allowing for the library code to be patched.
+
+-  Position-Independent Executable (PIE) support.
+
+Experimental features
+---------------------
+
+A feature is considered experimental when still in development or isn't known
+to the TF-A team as widely deployed or proven on end products. It is generally
+advised such options aren't pulled into real deployments, or done with the
+appropriate level of supplementary integration testing.
+
+A feature is no longer considered experimental when it is generally agreed
+the said feature has reached a level of maturity and quality comparable to
+other features that have been integrated into products.
+
+Experimental build options are found in following section
+:ref:`build_options_experimental`. Their use through the build emits a warning
+message.
+
+Additionally the following libraries are marked experimental when included
+in a platform:
+
+-  MPU translation library ``lib/xlat_mpu``
+-  RSS comms driver ``drivers/arm/rss``
+
+Still to come
+-------------
+
+-  Support for additional platforms.
+
+-  Documentation enhancements.
+
+-  Ongoing support for new architectural features, CPUs and System IP.
+
+-  Ongoing support for new Arm system architecture specifications.
+
+-  Ongoing security hardening, optimization and quality improvements.
+
+.. _SMC Calling Convention: https://developer.arm.com/docs/den0028/latest
+.. _OP-TEE Secure OS: https://github.com/OP-TEE/optee_os
+.. _NVIDIA Trusted Little Kernel: http://nv-tegra.nvidia.com/gitweb/?p=3rdparty/ote_partner/tlk.git;a=summary
+.. _Trusty Secure OS: https://source.android.com/security/trusty
+.. _ProvenCore Secure OS: https://provenrun.com/products/provencore/
+
+--------------
+
+*Copyright (c) 2019-2023, Arm Limited. All rights reserved.*