ARM Trusted Firmware
Detailed changes since last release
* Support for Foundation FVP Version 2.0 added.
The documented UEFI configuration disables some devices that are unavailable
in the Foundation FVP, including MMC and CLCD. The resultant UEFI binary can
be used on the AEMv8 and Cortex-A57-A53 FVPs, as well as the Foundation FVP.
NOTE: The software will not work on Version 1.0 of the Foundation FVP.
* Regression-checked against latest Base FVPs (Version 5.2).
* The supplied FDTs expose the Interrupt Translation Service (ITS) available
* Fixed various GCC compiler warnings.
* Unmask SError and Debug exceptions in the trusted firmware.
Also route external abort and SError interrupts to EL3.
* The amount of physical RAM available to Linux as specified in the FDTs for
Base FVPs have been increased from 2GB to 4GB. This resolves the issue of
failing to start user-space when using a RAM-disk file-system.
* Build products are now created in a separate build directory tree.
* Analyze at link-time whether bootloader images will fit in memory and won't
overlap each other at run time. If it is not the case then image linking
will now fail.
* Reduce the size of the bootloader images by cutting some sections out of
their disk images and allocating them at load time, whenever possible.
* Properly initialise the C runtime environment. C code can now safely assume
that global variables are initialised to 0 and that initialised data holds
the correct value.
* General changes on the memory layout: some sections have been moved, some of
them have been merged together, and some alignment constraints on sections
* Enable third party contributions. Add a new contributing.md containing
instructions for how to contribute and update copyright text in all files to
* The wake up enable bit in the FVP power controller is cleared when a cpu is
physically powered up to prevent a spurious wake up from a subsequent cpu
* Definitions of some constants related to the PSCI api calls AFFINITY_INFO
and CPU_SUSPEND have been corrected.
* A bug which triggered an error condition in the code executed after a cpu
is powered on, if a non zero context id parameter was passed in the PSCI
CPU_ON and CPU_SUSPEND api calls has been corrected.
* A restriction in the FVP code which did not allow the non-secure entrypoint
to lie outside the DRAM has been removed.
* The PSCI CPU_SUSPEND api has been stabilised to an extent where it can be
used for entry into power down states with the following restrictions:
- Entry into standby states is not supported.
- The api is only supported on the AEMv8 Base FVP.
* The PSCI AFFINITY_INFO api has undergone limited testing on the AEMv8 Base
FVP to allow experimental use.
* Locks corresponding to each affinity level are acquired and released in
the correct sequence in the PSCI implementation. Invocation of the PSCI
CPU_SUSPEND and CPU_OFF apis simultaneously across cpus & clusters should
not result in unexpected behaviour.
* The API to return the memory layout structures for each bootloader stage has
undergone change. A pointer to these structures is returned instead of their
* Required C library and runtime header files are now included locally in ARM
Trusted Firmware instead of depending on the toolchain standard include
paths. The local implementation has been cleaned up and reduced in scope.
Implementations for `putchar()` and `strchr()` were added to the local C
* GCC compiler built-in function support has been disabled in order to improve
* The references to GitHub issues in the documentation now to point to a
separate issue tracking repository
* Cleared bits in the architectural trap feature register (CPTR_EL3) during
early boot to prevent traps when accessing certain registers, including
floating point registers. Also added `-mgeneral-regs-only` flag to GCC
settings to prevent generation of code using floating point registers.
ARM Trusted Firmware - version 0.2
* First source release.
* Code for the PSCI suspend feature is supplied, although this is not enabled
by default since there are known issues (see below).
Issues resolved since last release
* The "psci" nodes in the FDTs provided in this release now fully comply
with the recommendations made in the PSCI specification.
The following is a list of issues which are expected to be fixed in the future
releases of the ARM Trusted Firmware.
* The TrustZone Address Space Controller (TZC-400) is not being programmed
yet. Use of model parameter `-C bp.secure_memory=1` is not supported.
* No support yet for secure world interrupt handling or for switching context
between secure and normal worlds in EL3.
* GICv3 support is experimental. The Linux kernel patches to support this are
not widely available. There are known issues with GICv3 initialization in
the ARM Trusted Firmware.
* Dynamic image loading is not available yet. The current image loader
implementation (used to load BL2 and all subsequent images) has some
limitations. Changing BL2 or BL3-1 load addresses in certain ways can lead
to loading errors, even if the images should theoretically fit in memory.
* Although support for PSCI `CPU_SUSPEND` is present, it is not yet stable
and ready for use.
* PSCI API calls `AFFINITY_INFO` & `PSCI_VERSION` are implemented but have not
* The ARM Trusted Firmware make files result in all build artifacts being
placed in the root of the project. These should be placed in appropriate
* The compilation of ARM Trusted Firmware is not free from compilation
warnings. Some of these warnings have not been investigated yet so they
could mask real bugs.
* The ARM Trusted Firmware currently uses toolchain/system include files like
stdio.h. It should provide versions of these within the project to maintain
compatibility between toolchains/systems.
* The PSCI code takes some locks in an incorrect sequence. This may cause
problems with suspend and hotplug in certain conditions.
* The Linux kernel used in this release is based on version 3.12-rc4. Using
this kernel with the ARM Trusted Firmware fails to start the file-system as
a RAM-disk. It fails to execute user-space `init` from the RAM-disk. As an
alternative, the VirtioBlock mechanism can be used to provide a file-system
to the kernel.
Detailed changes since last release
First source release - not applicable.
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