49e789e353
When we use our fdt_read_uint32* helper functions, we output a warning on not finding the requested property. However non-existing properties are not that uncommon, and *trying* to read such a property is actually a nice way of checking its existence. Since we already return a specific error value in this case, the caller can easily check this and give a more specific error message, if needed. When the caller decides to properly handle the error (fallback, default value, etc), a message on the console is quite misleading. Demote the message to a VERBOSE, so normal builds will not spam the console with pointless messages. Change-Id: I7a279a4ee0147c5f4a0503d0a8745c6cfea58be5 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.