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The A/B loader [1] meant to be used for convenient CI testing. The tool is installed into the same location as SA0, where it conveniently fits due to its size, and where it makes use of non-volatile PMIC registers to alternate between loading and starting A or B copy of the BL2. The PMIC registers are used because CPU registers are lost across reset. In case the B copy is loaded, it is loaded from 8 MiB offset from start of HF. In case the B copy fails to boot, a simple reset of the system will switch back to booting previously known working A copy and allow recovery. The A/B loader sets MFIS bit MFISBTSTSR_BOOT_PARTITION to pass the information which A/B copy is currently booting on to TFA, which then loads the follow up components from 0 MiB or 8 MiB offset, depending on whether the A or B copy is being booted. The MFISBTSTSR_BOOT_PARTITION interferes with regular A/B switching during boot from eMMC as the boot media, where the BootROM also sets MFISBTSTSR_BOOT_PARTITION bit in case the system boots from SECOND eMMC HW BOOT partition. Since the A/B loader is meant as a development and CI tool, isolate the A/B loader use to RPC HF only and furthermore isolate it behind new RCAR_RPC_HYPERFLASH_ABLOADER option which is disabled by default. [1] https://github.com/marex/abloader Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org> Change-Id: I04ecd50fa1405b78e1ba3949d54029034d4f22d8 |
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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