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The erratum titled “Disabling of data prefetcher with outstanding prefetch TLB miss might cause a deadlock” should not be handled within TF-A. The current workaround attempts to follow option 2 but misapplies it. Specifically, it statically sets PF_MODE to conservative, which is not the recommended approach. According to the erratum documentation, PF_MODE should be configured in conservative mode only when we disable data prefetcher however this is not done in TF-A and thus the workaround is not needed in TF-A. The static setting of PF_MODE in TF-A does not correctly address the erratum and may introduce unnecessary performance degradation on platforms that adopt it without fully understanding its implications. To prevent incorrect or unintended use, the current implementation of this erratum workaround should be removed from TF-A and not adopted by platforms. List of Impacted CPU's with Errata Numbers and reference to SDEN - Cortex-A78 - 2132060 - https://developer.arm.com/documentation/SDEN1401784/latest Cortex-A78C - 2132064 - https://developer.arm.com/documentation/SDEN-2004089/latest Cortex-A710 - 2058056 - https://developer.arm.com/documentation/SDEN-1775101/latest Cortex-X2 - 2058056 - https://developer.arm.com/documentation/SDEN-1775100/latest Cortex-X3 - 2070301 - https://developer.arm.com/documentation/SDEN2055130/latest Neoverse-N2 - 2138953 - https://developer.arm.com/documentation/SDEN-1982442/latest Neoverse-V1 - 2108267 - https://developer.arm.com/documentation/SDEN-1401781/latest Neoverse-V2 - 2331132 - https://developer.arm.com/documentation/SDEN-2332927/latest Change-Id: Icf4048508ae070b2df073cc46c63be058b2779df Signed-off-by: Govindraj Raja <govindraj.raja@arm.com> |
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Trusted Firmware-A ================== Trusted Firmware-A (TF-A) is a reference implementation of secure world software for `Arm A-Profile architectures`_ (Armv8-A and Armv7-A), including an Exception Level 3 (EL3) `Secure Monitor`_. It provides a suitable starting point for productization of secure world boot and runtime firmware, in either the AArch32 or AArch64 execution states. TF-A implements Arm interface standards, including: - `Power State Coordination Interface (PSCI)`_ - `Trusted Board Boot Requirements CLIENT (TBBR-CLIENT)`_ - `SMC Calling Convention`_ - `System Control and Management Interface (SCMI)`_ - `Software Delegated Exception Interface (SDEI)`_ The code is designed to be portable and reusable across hardware platforms and software models that are based on the Armv8-A and Armv7-A architectures. In collaboration with interested parties, we will continue to enhance TF-A with reference implementations of Arm standards to benefit developers working with Armv7-A and Armv8-A TrustZone technology. Users are encouraged to do their own security validation, including penetration testing, on any secure world code derived from TF-A. More Info and Documentation --------------------------- To find out more about Trusted Firmware-A, please `view the full documentation`_ that is available through `trustedfirmware.org`_. -------------- *Copyright (c) 2013-2019, Arm Limited and Contributors. All rights reserved.* .. _Armv7-A and Armv8-A: https://developer.arm.com/products/architecture/a-profile .. _Secure Monitor: http://www.arm.com/products/processors/technologies/trustzone/tee-smc.php .. _Power State Coordination Interface (PSCI): PSCI_ .. _PSCI: http://infocenter.arm.com/help/topic/com.arm.doc.den0022d/Power_State_Coordination_Interface_PDD_v1_1_DEN0022D.pdf .. _Trusted Board Boot Requirements CLIENT (TBBR-CLIENT): https://developer.arm.com/docs/den0006/latest .. _SMC Calling Convention: http://infocenter.arm.com/help/topic/com.arm.doc.den0028b/ARM_DEN0028B_SMC_Calling_Convention.pdf .. _System Control and Management Interface (SCMI): SCMI_ .. _SCMI: http://infocenter.arm.com/help/topic/com.arm.doc.den0056a/DEN0056A_System_Control_and_Management_Interface.pdf .. _Software Delegated Exception Interface (SDEI): SDEI_ .. _SDEI: http://infocenter.arm.com/help/topic/com.arm.doc.den0054a/ARM_DEN0054A_Software_Delegated_Exception_Interface.pdf .. _Arm A-Profile architectures: https://developer.arm.com/architectures/cpu-architecture/a-profile .. _view the full documentation: https://www.trustedfirmware.org/docs/tf-a .. _trustedfirmware.org: http://www.trustedfirmware.org