d850169c9c
The Arm FPGAs run in mostly one clock domain, which is used for the CPU cores, the generic timer, and also the UART baudrate base clock. This single clock can have different rates, to compensate for different IP complexity. So far most images used 10 MHz, but different rates start to appear. To avoid patching both the arch timer frequency and UART baud base fixed clock in the DTB manually, we would like to set the clock rate automatically. Fortunately the SCP firmware has the actual clock rate hard coded, and already programs the PL011 UART baud divider register with the correct value to achieve a 38400 bps baudrate. So read the two PL011 baudrate divider values and re-calculate the original base clock from there, to use as the arch timer frequency. If the arch timer DT node contains a clock-frequency property, we use that instead, to support overriding and disabling this autodetection. Change-Id: I9857fbb418deb4644aeb2816f1102796f9bfd3bb Signed-off-by: Andre Przywara <andre.przywara@arm.com> |
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readme.rst
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.