| ARM Trusted Firmware - version 0.3 |
| ================================== |
| |
| New features |
| ------------ |
| |
| * 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 Base FVPs, as well as the Foundation |
| FVP. |
| |
| NOTE: The software will not work on Version 1.0 of the Foundation FVP. |
| |
| * Enabled third party contributions. Added a new contributing.md containing |
| instructions for how to contribute and updated copyright text in all files |
| to acknowledge contributors. |
| |
| * The PSCI CPU_SUSPEND API has been stabilised to the 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 and Cortex-A57-A53 Base FVPs. |
| |
| * The PSCI AFFINITY_INFO api has undergone limited testing on the Base FVPs to |
| allow experimental use. |
| |
| * 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. |
| |
| * Added I/O abstraction framework, primarily to allow generic code to load |
| images in a platform-independent way. The existing image loading code has |
| been reworked to use the new framework. Semi-hosting and NOR flash I/O |
| drivers are provided. |
| |
| * Introduced Firmware Image Package (FIP) handling code and tools. A FIP |
| combines multiple firmware images with a Table of Contents (ToC) into a |
| single binary image. The new FIP driver is another type of I/O driver. The |
| Makefile builds a FIP by default and the FVP platform code expect to load a |
| FIP from NOR flash, although some support for image loading using semi- |
| hosting is retained. |
| |
| NOTE: Building a FIP by default is a non-backwards-compatible change. |
| |
| NOTE: Generic BL2 code now loads a BL3-3 (non-trusted firmware) image into |
| DRAM instead of expecting this to be pre-loaded at known location. This is |
| also a non-backwards-compatible change. |
| |
| NOTE: Some non-trusted firmware (e.g. UEFI) will need to be rebuilt so that |
| it knows the new location to execute from and no longer needs to copy |
| particular code modules to DRAM itself. |
| |
| * Reworked BL2 to BL3-1 handover interface. A new composite structure |
| (bl31_args) holds the superset of information that needs to be passed from |
| BL2 to BL3-1, including information on how handover execution control to |
| BL3-2 (if present) and BL3-3 (non-trusted firmware). |
| |
| * Added library support for CPU context management, allowing the saving and |
| restoring of |
| - Shared system registers between Secure-EL1 and EL1. |
| - VFP registers. |
| - Essential EL3 system registers. |
| |
| * Added a framework for implementing EL3 runtime services. Reworked the PSCI |
| implementation to be one such runtime service. |
| |
| * Reworked the exception handling logic, making use of both SP_EL0 and SP_EL3 |
| stack pointers for determining the type of exception, managing general |
| purpose and system register context on exception entry/exit, and handling |
| SMCs. SMCs are directed to the correct EL3 runtime service. |
| |
| * Added support for a Test Secure-EL1 Payload (TSP) and a corresponding |
| Dispatcher (TSPD), which is loaded as an EL3 runtime service. The TSPD |
| implements Secure Monitor functionality such as world switching and |
| EL1 context management, and is responsible for communication with the TSP. |
| NOTE: The TSPD does not yet contain support for secure world interrupts. |
| NOTE: The TSP/TSPD is not built by default. |
| |
| |
| Issues resolved since last release |
| ---------------------------------- |
| |
| * Support has been added for switching context between secure and normal |
| worlds in EL3. |
| |
| * PSCI API calls `AFFINITY_INFO` & `PSCI_VERSION` have now been tested (to |
| a limited extent). |
| |
| * The ARM Trusted Firmware build artifacts are now placed in the `./build` |
| directory and sub-directories instead of being placed in the root of the |
| project. |
| |
| * The ARM Trusted Firmware is now free from build warnings. Build warnings |
| are now treated as errors. |
| |
| * The ARM Trusted Firmware now provides C library support locally within the |
| project to maintain compatibility between toolchains/systems. |
| |
| * The PSCI locking code has been reworked so it no longer takes locks in an |
| incorrect sequence. |
| |
| * The RAM-disk method of loading a Linux file-system has been confirmed to |
| work with the ARM Trusted Firmware and Linux kernel version (based on |
| version 3.13) used in this release, for both Foundation and Base FVPs. |
| |
| |
| Known issues |
| ------------ |
| |
| 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. |
| |
| * 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. |
| |
| * The ARM Trusted Firmware uses too much on-chip Trusted SRAM. Currently the |
| Test Secure-EL1 Payload (BL3-2) executes in Trusted DRAM since there is not |
| enough SRAM. A number of RAM usage enhancements have been identified to |
| rectify this situation. |
| |
| * CPU idle does not work on the advertised version of the Foundation FVP. |
| Some FVP fixes are required that are not available externally at the time |
| of writing. |
| |
| * Various bugs in ARM Trusted Firmware, UEFI and the Linux kernel have been |
| observed when using Linaro toolchain versions later than 13.11. Although |
| most of these have been fixed, some remain at the time of writing. These |
| mainly seem to relate to a subtle change in the way the compiler converts |
| between 64-bit and 32-bit values (e.g. during casting operations), which |
| reveals previously hidden bugs in client code. |
| |
| * The tested filesystem used for this release (Linaro AArch64 OpenEmbedded |
| 14.01) does not report progress correctly in the console. It only seems to |
| produce error output, not standard output. It otherwise appears to function |
| correctly. Other filesystem versions on the same software stack do not |
| exhibit the problem. |
| |
| * The Makefile structure doesn't make it easy to separate out parts of the |
| Trusted Firmware for re-use in platform ports, for example if only BL3-1 is |
| required in a platform port. Also, dependency checking in the Makefile is |
| flawed. |
| |
| * The firmware design documentation for the Test Secure-EL1 Payload (TSP) and |
| its dispatcher (TSPD) is incomplete. Similarly for the PSCI section. |
| |
| |
| ARM Trusted Firmware - version 0.2 |
| ================================== |
| |
| New features |
| ------------ |
| |
| * 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. |
| |
| |
| Known issues |
| ------------ |
| |
| 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 |
| been tested. |
| |
| * 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 |
| sub-directories. |
| |
| * 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. |
| |
| |
| - - - - - - - - - - - - - - - - - - - - - - - - - - |
| |
| _Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved._ |
