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PMF: Add documentation
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Add a Performance Measurement Framework (PMF) section
to the firmware design document.
Change-Id: I5953bd3b1067501f190164c8827d2b0d8022fc0b
Signed-off-by: dp-arm <dimitris.papastamos@arm.com>
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This patch updates the firmware-design.md for AArch32 related changes.
Change-Id: Idf392a44861ab9c1f59f3de4f3435f508b17c678
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This patch adds the PSCI library integration guide for AArch32 ARMv8-A
systems `psci-lib-integration-guide.md` to the documentation. The
patch also adds appropriate reference to the new document in
the `firmware-design.md` document.
Change-Id: I2d5b5c6b612452371713399702e318e3c73a8ee0
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This patch adds support for NODE_HW_STATE PSCI API by introducing a new
PSCI platform hook (get_node_hw_state). The implementation validates
supplied arguments, and then invokes this platform-defined hook and
returns its result to the caller. PSCI capabilities are updated
accordingly.
Also updates porting and firmware design guides.
Change-Id: I808e55bdf0c157002a7c104b875779fe50a68a30
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Replace fip_create with fiptool
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fiptool provides a more consistent and intuitive interface compared to
the fip_create program. It serves as a better base to build on more
features in the future.
fiptool supports various subcommands. Below are the currently
supported subcommands:
1) info - List the images contained in a FIP file.
2) create - Create a new FIP file with the given images.
3) update - Update an existing FIP with the given images.
4) unpack - Extract a selected set or all the images from a FIP file.
5) remove - Remove images from a FIP file. This is a new command that
was not present in fip_create.
To create a new FIP file, replace "fip_create" with "fiptool create".
To update a FIP file, replace "fip_create" with "fiptool update".
To dump the contents of a FIP file, replace "fip_create --dump" with
"fiptool info".
A compatibility script that emulates the basic functionality of
fip_create is provided. Existing scripts might or might not work with
the compatibility script. Users are strongly encouraged to migrate to
fiptool.
Fixes ARM-Software/tf-issues#87
Fixes ARM-Software/tf-issues#108
Fixes ARM-Software/tf-issues#361
Change-Id: I7ee4da7ac60179cc83cf46af890fd8bc61a53330
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This patch documents the effect, cost and benefits of the
SEPARATE_CODE_AND_RODATA build flag.
Change-Id: Ic8daf0563fa6335930ad6c70b9c35f678e84d39d
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This patch moves the PSCI services and BL31 frameworks like context
management and per-cpu data into new library components `PSCI` and
`el3_runtime` respectively. This enables PSCI to be built independently from
BL31. A new `psci_lib.mk` makefile is introduced which adds the relevant
PSCI library sources and gets included by `bl31.mk`. Other changes which
are done as part of this patch are:
* The runtime services framework is now moved to the `common/` folder to
enable reuse.
* The `asm_macros.S` and `assert_macros.S` helpers are moved to architecture
specific folder.
* The `plat_psci_common.c` is moved from the `plat/common/aarch64/` folder
to `plat/common` folder. The original file location now has a stub which
just includes the file from new location to maintain platform compatibility.
Most of the changes wouldn't affect platform builds as they just involve
changes to the generic bl1.mk and bl31.mk makefiles.
NOTE: THE `plat_psci_common.c` FILE HAS MOVED LOCATION AND THE STUB FILE AT
THE ORIGINAL LOCATION IS NOW DEPRECATED. PLATFORMS SHOULD MODIFY THEIR
MAKEFILES TO INCLUDE THE FILE FROM THE NEW LOCATION.
Change-Id: I6bd87d5b59424995c6a65ef8076d4fda91ad5e86
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At the moment, all BL images share a similar memory layout: they start
with their code section, followed by their read-only data section.
The two sections are contiguous in memory. Therefore, the end of the
code section and the beginning of the read-only data one might share
a memory page. This forces both to be mapped with the same memory
attributes. As the code needs to be executable, this means that the
read-only data stored on the same memory page as the code are
executable as well. This could potentially be exploited as part of
a security attack.
This patch introduces a new build flag called
SEPARATE_CODE_AND_RODATA, which isolates the code and read-only data
on separate memory pages. This in turn allows independent control of
the access permissions for the code and read-only data.
This has an impact on memory footprint, as padding bytes need to be
introduced between the code and read-only data to ensure the
segragation of the two. To limit the memory cost, the memory layout
of the read-only section has been changed in this case.
- When SEPARATE_CODE_AND_RODATA=0, the layout is unchanged, i.e.
the read-only section still looks like this (padding omitted):
| ... |
+-------------------+
| Exception vectors |
+-------------------+
| Read-only data |
+-------------------+
| Code |
+-------------------+ BLx_BASE
In this case, the linker script provides the limits of the whole
read-only section.
- When SEPARATE_CODE_AND_RODATA=1, the exception vectors and
read-only data are swapped, such that the code and exception
vectors are contiguous, followed by the read-only data. This
gives the following new layout (padding omitted):
| ... |
+-------------------+
| Read-only data |
+-------------------+
| Exception vectors |
+-------------------+
| Code |
+-------------------+ BLx_BASE
In this case, the linker script now exports 2 sets of addresses
instead: the limits of the code and the limits of the read-only
data. Refer to the Firmware Design guide for more details. This
provides platform code with a finer-grained view of the image
layout and allows it to map these 2 regions with the appropriate
access permissions.
Note that SEPARATE_CODE_AND_RODATA applies to all BL images.
Change-Id: I936cf80164f6b66b6ad52b8edacadc532c935a49
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This patch adds a new linker symbol in BL1's linker script named
'__BL1_ROM_END__', which marks the end of BL1's ROM content. This
covers BL1's code, read-only data and read-write data to relocate
in Trusted SRAM. The address of this new linker symbol is exported
to C code through the 'BL1_ROM_END' macro.
The section related to linker symbols in the Firmware Design guide
has been updated and improved.
Change-Id: I5c442ff497c78d865ffba1d7d044511c134e11c7
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This patch adds following optional PSCI STAT functions:
- PSCI_STAT_RESIDENCY: This call returns the amount of time spent
in power_state in microseconds, by the node represented by the
`target_cpu` and the highest level of `power_state`.
- PSCI_STAT_COUNT: This call returns the number of times a
`power_state` has been used by the node represented by the
`target_cpu` and the highest power level of `power_state`.
These APIs provides residency statistics for power states that has
been used by the platform. They are implemented according to v1.0
of the PSCI specification.
By default this optional feature is disabled in the PSCI
implementation. To enable it, set the boolean flag
`ENABLE_PSCI_STAT` to 1. This also sets `ENABLE_PMF` to 1.
Change-Id: Ie62e9d37d6d416ccb1813acd7f616d1ddd3e8aff
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This patch enables the SCR_EL3.SIF (Secure Instruction Fetch) bit in BL1 and
BL31 common architectural setup code. When in secure state, this disables
instruction fetches from Non-secure memory.
NOTE: THIS COULD BREAK PLATFORMS THAT HAVE SECURE WORLD CODE EXECUTING FROM
NON-SECURE MEMORY, BUT THIS IS CONSIDERED UNLIKELY AND IS A SERIOUS SECURITY
RISK.
Fixes ARM-Software/tf-issues#372
Change-Id: I684e84b8d523c3b246e9a5fabfa085b6405df319
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Asynchronous abort exceptions generated by the platform during cold boot are
not taken in EL3 unless SCR_EL3.EA is set.
Therefore EA bit is set along with RES1 bits in early BL1 and BL31 architecture
initialisation. Further write accesses to SCR_EL3 preserve these bits during
cold boot.
A build flag controls SCR_EL3.EA value to keep asynchronous abort exceptions
being trapped by EL3 after cold boot or not.
For further reference SError Interrupts are also known as asynchronous external
aborts.
On Cortex-A53 revisions below r0p2, asynchronous abort exceptions are taken in
EL3 whatever the SCR_EL3.EA value is.
Fixes arm-software/tf-issues#368
Signed-off-by: Gerald Lejeune <gerald.lejeune@st.com>
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The Firmware Design document is meant to provide a general overview
of the Trusted Firmware code. Although it is useful to provide some
guidance around the responsibilities of the platform layer, it should
not provide too much platform specific implementation details. Right
now, some sections are too tied to the implementation on ARM
platforms. This makes the Firmware Design document harder to digest.
This patch simplifies this aspect of the Firmware Design document.
The sections relating the platform initialisations performed by the
different BL stages have been simplified and the extra details about
the ARM platforms implementation have been moved to the Porting Guide
when appropriate.
This patch also provides various documentation fixes and additions
in the Firmware Design and Platform Porting Guide. In particular:
- Update list of SMCs supported by BL1.
- Remove MMU setup from architectural inits, as it is actually
performed by platform code.
- Similarly, move runtime services initialisation, BL2 image
initialization and BL33 execution out of the platform
initialisation paragraph.
- List SError interrupt unmasking as part of BL1 architectural
initialization.
- Mention Trusted Watchdog enabling in BL1 on ARM platforms.
- Fix order of steps in "BL2 image load and execution" section.
- Refresh section about GICv3/GICv2 drivers initialisation on
ARM platforms.
Change-Id: I32113c4ffdc26687042629cd8bbdbb34d91e3c14
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This patch adds a brief explanation of the top/bottom load approach
to the Firmware Design guide and how Trusted Firmware keeps track of
the free memory at boot time. This will help platform developers to
avoid unexpected results in the memory layout.
Fixes ARM-software/tf-issues#319
Change-Id: I04be7e24c1f3b54d28cac29701c24bf51a5c00ad
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Since commit 804040d106, the Juno port has moved from per-CPU mailboxes
to a single shared one. This patch updates an out-dated reference to
the former per-CPU mailboxes mechanism in the Firmware Design.
Change-Id: I355b54156b1ace1b3df4c4416e1e8625211677fc
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Change-Id: I4fcdb8e813e0392c2cd3d0623698e8319b3b0593
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This patch fixes a couple of issues in the "CPU specific operations
framework" section in the Firmware Design document.
* Fix broken link to the CPU Specific Build Macros document.
* Fix the path to the cortex_a53.S file.
* Fix power levels terminology.
Change-Id: Ib610791eaba13dab2823b7699bb63534bcd1c8fb
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Change-Id: I6f49bd779f2a4d577c6443dd160290656cdbc59b
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FWU: Add documentation for Firmware Update feature
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This patch adds design documentation for the Firmware Update (FWU)
feature in `firmware-update.md`. It provides an overview of FWU,
describes the BL1 SMC interface, and includes diagrams showing
an example FWU boot flow and the FWU state machine.
This patch also updates the existing TF documents where needed:
* `porting-guide.md`
* `user-guide.md`
* `firmware-design.md`
* `rt-svc-writers-guide.md`
* `trusted_board_boot.md`
Change-Id: Ie6de31544429b18f01327bd763175e218299a4ce
Co-Authored-By: Dan Handley <dan.handley@arm.com>
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This patch introduces a new document presenting the ARM Trusted
Firmware Reset Design. It shows the reset code flow, lists the
different build options that affect it, in which case to use them
and what their exact effect is.
The section about using BL31 entrypoint as the reset address has
been moved from the general firmware design document to this one.
It's also been improved to explain why the FVP port supports the
RESET_TO_BL31 configuration, even though the reset vector address
can't be programmed dynamically.
This document includes some images, which have been generated using
Dia version 0.97.2. This tool can be obtained from:
https://wiki.gnome.org/Apps/Dia/Download
This patch provides:
- the image files describing the different reset flow diagrams;
- the source '.dia' file;
- a script automating the generation of the images from the '.dia'
file.
Note that the 2 latter files are not actually needed for the document
and are provided for convenience only, in case the reset images need
to be modified.
Change-Id: Ib6302e8209d418a5b31c4e85e55fd9e83caf2ca2
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This patch removes the dash character from the image name, to
follow the image terminology in the Trusted Firmware Wiki page:
https://github.com/ARM-software/arm-trusted-firmware/wiki
Changes apply to output messages, comments and documentation.
non-ARM platform files have been left unmodified.
Change-Id: Ic2a99be4ed929d52afbeb27ac765ceffce46ed76
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This patch replaces all references to the SCP Firmware (BL0, BL30,
BL3-0, bl30) with the image terminology detailed in the TF wiki
(https://github.com/ARM-software/arm-trusted-firmware/wiki):
BL0 --> SCP_BL1
BL30, BL3-0 --> SCP_BL2
bl30 --> scp_bl2
This change affects code, documentation, build system, tools and
platform ports that load SCP firmware. ARM plaforms have been
updated to the new porting API.
IMPORTANT: build option to specify the SCP FW image has changed:
BL30 --> SCP_BL2
IMPORTANT: This patch breaks compatibility for platforms that use BL2
to load SCP firmware. Affected platforms must be updated as follows:
BL30_IMAGE_ID --> SCP_BL2_IMAGE_ID
BL30_BASE --> SCP_BL2_BASE
bl2_plat_get_bl30_meminfo() --> bl2_plat_get_scp_bl2_meminfo()
bl2_plat_handle_bl30() --> bl2_plat_handle_scp_bl2()
Change-Id: I24c4c1a4f0e4b9f17c9e4929da815c4069549e58
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This patch unifies the bakery lock api's across coherent and normal
memory implementation of locks by using same data type `bakery_lock_t`
and similar arguments to functions.
A separate section `bakery_lock` has been created and used to allocate
memory for bakery locks using `DEFINE_BAKERY_LOCK`. When locks are
allocated in normal memory, each lock for a core has to spread
across multiple cache lines. By using the total size allocated in a
separate cache line for a single core at compile time, the memory for
other core locks is allocated at link time by multiplying the single
core locks size with (PLATFORM_CORE_COUNT - 1). The normal memory lock
algorithm now uses lock address instead of the `id` in the per_cpu_data.
For locks allocated in coherent memory, it moves locks from
tzfw_coherent_memory to bakery_lock section.
The bakery locks are allocated as part of bss or in coherent memory
depending on usage of coherent memory. Both these regions are
initialised to zero as part of run_time_init before locks are used.
Hence, bakery_lock_init() is made an empty function as the lock memory
is already initialised to zero.
The above design lead to the removal of psci bakery locks from
non_cpu_power_pd_node to psci_locks.
NOTE: THE BAKERY LOCK API WHEN USE_COHERENT_MEM IS NOT SET HAS CHANGED.
THIS IS A BREAKING CHANGE FOR ALL PLATFORM PORTS THAT ALLOCATE BAKERY
LOCKS IN NORMAL MEMORY.
Change-Id: Ic3751c0066b8032dcbf9d88f1d4dc73d15f61d8b
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ARM TF configures all interrupts as non-secure except those which
are present in irq_sec_array. This patch updates the irq_sec_array
with the missing secure interrupts for ARM platforms.
It also updates the documentation to be inline with the latest
implementation.
Fixes ARM-software/tf-issues#312
Change-Id: I39956c56a319086e3929d1fa89030b4ec4b01fcc
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PSCI: Add SYSTEM_SUSPEND API support
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This patch adds support for SYSTEM_SUSPEND API as mentioned in the PSCI 1.0
specification. This API, on being invoked on the last running core on a
supported platform, will put the system into a low power mode with memory
retention.
The psci_afflvl_suspend() internal API has been reused as most of the actions
to suspend a system are the same as invoking the PSCI CPU_SUSPEND API with the
target affinity level as 'system'. This API needs the 'power state' parameter
for the target low power state. This parameter is not passed by the caller of
the SYSTEM_SUSPEND API. Hence, the platform needs to implement the
get_sys_suspend_power_state() platform function to provide this information.
Also, the platform also needs to add support for suspending the system to the
existing 'plat_pm_ops' functions: affinst_suspend() and
affinst_suspend_finish().
Change-Id: Ib6bf10809cb4e9b92f463755608889aedd83cef5
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The attempt to run the CPU reset code as soon as possible after reset
results in highly complex conditional code relating to the
RESET_TO_BL31 option.
This patch relaxes this requirement a little. In the BL1, BL3-1 and
PSCI entrypoints code, the sequence of operations is now as follows:
1) Detect whether it is a cold or warm boot;
2) For cold boot, detect whether it is the primary or a secondary
CPU. This is needed to handle multiple CPUs entering cold reset
simultaneously;
3) Run the CPU init code.
This patch also abstracts the EL3 registers initialisation done by
the BL1, BL3-1 and PSCI entrypoints into common code.
This improves code re-use and consolidates the code flows for
different types of systems.
NOTE: THE FUNCTION plat_secondary_cold_boot() IS NOW EXPECTED TO
NEVER RETURN. THIS PATCH FORCES PLATFORM PORTS THAT RELIED ON THE
FORMER RETRY LOOP AT THE CALL SITE TO MODIFY THEIR IMPLEMENTATION.
OTHERWISE, SECONDARY CPUS WILL PANIC.
Change-Id: If5ecd74d75bee700b1bd718d23d7556b8f863546
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This patch removes the FIRST_RESET_HANDLER_CALL build flag and its
use in ARM development platforms. If a different reset handling
behavior is required between the first and subsequent invocations
of the reset handling code, this should be detected at runtime.
On Juno, the platform reset handler is now always compiled in.
This means it is now executed twice on the cold boot path, first in
BL1 then in BL3-1, and it has the same behavior in both cases. It is
also executed twice on the warm boot path, first in BL1 then in the
PSCI entrypoint code.
Also update the documentation to reflect this change.
NOTE: THIS PATCH MAY FORCE PLATFORM PORTS THAT USE THE
FIRST_RESET_HANDLER_CALL BUILD OPTION TO FIX THEIR RESET HANDLER.
Change-Id: Ie5c17dbbd0932f5fa3b446efc6e590798a5beae2
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On ARM standard platforms, snoop and DVM requests used to be enabled
for the primary CPU's cluster only in the first EL3 bootloader.
In other words, if the platform reset into BL1 then CCI coherency
would be enabled by BL1 only, and not by BL3-1 again.
However, this doesn't cater for platforms that use BL3-1 along with
a non-TF ROM bootloader that doesn't enable snoop and DVM requests.
In this case, CCI coherency is never enabled.
This patch modifies the function bl31_early_platform_setup() on
ARM standard platforms so that it always enables snoop and DVM
requests regardless of whether earlier bootloader stages have
already done it. There is no harm in executing this code twice.
ARM Trusted Firmware Design document updated accordingly.
Change-Id: Idf1bdeb24d2e1947adfbb76a509f10beef224e1c
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Update the User Guide, Porting Guide and Firmware Design documents
to align them with the recent changes made to the FVP and Juno
platform ports.
Also fix some other historical inaccuracies.
Change-Id: I37aba4805f9044b1a047996d3e396c75f4a09176
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Documentation for version 1.1
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Final updates to readme.md and change-log.md for ARM Trusted Firmware version
1.1. Also increment the version in the Makefile.
Change-Id: Ib001a6ec9a9c570985841d06f0ff80ed76c2996b
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Change-Id: Iaf9d6305edc478d39cf1b37c8a70ccdf723e8ef9
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The CPU specific reset handlers no longer have the freedom
of using any general purpose register because it is being invoked
by the BL3-1 entry point in addition to BL1. The Cortex-A57 CPU
specific reset handler was overwriting x20 register which was being
used by the BL3-1 entry point to save the entry point information.
This patch fixes this bug by reworking the register allocation in the
Cortex-A57 reset handler to avoid using x20. The patch also
explicitly mentions the register clobber list for each of the
callee functions invoked by the reset handler
Change-Id: I28fcff8e742aeed883eaec8f6c4ee2bd3fce30df
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Allow BL3-2 to be loaded into the secure region of DRAM
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This patch adds support to call the reset_handler() function in BL3-1 in the
cold and warm boot paths when another Boot ROM reset_handler() has already run.
This means the BL1 and BL3-1 versions of the CPU and platform specific reset
handlers may execute different code to each other. This enables a developer to
perform additional actions or undo actions already performed during the first
call of the reset handlers e.g. apply additional errata workarounds.
Typically, the reset handler will be first called from the BL1 Boot ROM. Any
additional functionality can be added to the reset handler when it is called
from BL3-1 resident in RW memory. The constant FIRST_RESET_HANDLER_CALL is used
to identify whether this is the first version of the reset handler code to be
executed or an overridden version of the code.
The Cortex-A57 errata workarounds are applied only if they have not already been
applied.
Fixes ARM-software/tf-issue#275
Change-Id: Id295f106e4fda23d6736debdade2ac7f2a9a9053
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This patch:
* Bumps the PSCI VERSION to 1.0. This means that
the PSCI_VERSION API will now return the value 0x00010000
to indicate the version as 1.0. The firmware remains
compatible with PSCI v0.2 clients.
* The firmware design guide is updated to document the
APIs supported by the Trusted Firmware generic code.
* The FVP Device Tree Sources (dts) and Blobs(dtb) are also
updated to add "psci-1.0" and "psci-0.2" to the list of
compatible PSCI versions.
Change-Id: Iafc2f549c92651dcd65d7e24a8aae35790d00f8a
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This patch allows the secure payload (BL3-2) to be loaded in the
DRAM region secured by the TrustZone controller (top 16 MB of DRAM1).
The location of BL3-2 can be selected at build time by setting the
build flag FVP_TSP_RAM_LOCATION to one of the following options:
- 'tsram' : Trusted SRAM (this is the default option)
- 'tdram' : Trusted DRAM
- 'dram' : Secure region in DRAM1 (top 16MB configured by the
TrustZone controller)
The number of MMU tables in BL3-2 depends on its location in
memory: 3 in case it is loaded in DRAM, 2 otherwise.
Documentation updated accordingly.
Fixes ARM-software/tf-issues#212
Change-Id: I371eef3a4159f06a0c9e3c6c1f4c905b2f93803a
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This patch extends the build option `USE_COHERENT_MEMORY` to
conditionally remove coherent memory from the memory maps of
all boot loader stages. The patch also adds necessary
documentation for coherent memory removal in firmware-design,
porting and user guides.
Fixes ARM-Software/tf-issues#106
Change-Id: I260e8768c6a5c2efc402f5804a80657d8ce38773
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Juno: Add support for image overlaying in Trusted SRAM
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This patch allows the BL3-1 NOBITS section to overlap the BL1 R/W
section since the former will always be used after the latter.
Similarly, the BL3-2 NOBITS section can overlay the BL2 image
when BL3-2 is loaded in Trusted SRAM.
Due to the current size of the images, there is no actual overlap.
Nevertheless, this reorganization may help to optimise the Trusted
SRAM usage when the images size grows.
Note that because BL3-1 NOBITS section is allowed to overlap the
BL1 R/W section, BL1 global variables will remain valid only until
execution reaches the BL3-1 entry point during a cold boot.
Documentation updated accordingly.
Fixes ARM-software/tf-issues#254
Change-Id: Id538f4d1c7f1f7858108280fd7b97e138572b879
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Fixes arm-software/tf-issues#276
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This patch optimizes the Cortex-A57 cluster power down sequence by not
flushing the Level1 data cache. The L1 data cache and the L2 unified
cache are inclusive. A flush of the L2 by set/way flushes any dirty
lines from the L1 as well. This is a known safe deviation from the
Cortex-A57 TRM defined power down sequence. This optimization can be
enabled by the platform through the 'SKIP_A57_L1_FLUSH_PWR_DWN' build
flag. Each Cortex-A57 based platform must make its own decision on
whether to use the optimization.
This patch also renames the cpu-errata-workarounds.md to
cpu-specific-build-macros.md as this facilitates documentation
of both CPU Specific errata and CPU Specific Optimization
build macros.
Change-Id: I299b9fe79e9a7e08e8a0dffb7d345f9a00a71480
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FVP: keep shared data in Trusted SRAM
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This patch deprecates the build option to relocate the shared data
into Trusted DRAM in FVP. After this change, shared data is always
located at the base of Trusted SRAM. This reduces the complexity
of the memory map and the number of combinations in the build
options.
Fixes ARM-software/tf-issues#257
Change-Id: I68426472567b9d8c6d22d8884cb816f6b61bcbd3
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This patch configures the TrustZone Controller in Juno to split
the 2GB DDR-DRAM memory at 0x80000000 into Secure and Non-Secure
regions:
- Secure DDR-DRAM: top 16 MB, except for the last 2 MB which are
used by the SCP for DDR retraining
- Non-Secure DDR-DRAM: remaining DRAM starting at base address
Build option PLAT_TSP_LOCATION selects the location of the secure
payload (BL3-2):
- 'tsram' : Trusted SRAM (default option)
- 'dram' : Secure region in the DDR-DRAM (set by the TrustZone
controller)
The MMU memory map has been updated to give BL2 permission to load
BL3-2 into the DDR-DRAM secure region.
Fixes ARM-software/tf-issues#233
Change-Id: I6843fc32ef90aadd3ea6ac4c7f314f8ecbd5d07b
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This patch adds support for supplying pre-built BL binaries for BL2,
BL3-1 and BL3-2 during trusted firmware build. Specifying BLx = <path_to_BLx>
in the build command line, where 'x' is any one of BL2, BL3-1 or BL3-2, will
skip building that BL stage from source and include the specified binary in
final fip image.
This patch also makes BL3-3 binary for FIP optional depending on the
value of 'NEED_BL33' flag which is defined by the platform.
Fixes ARM-software/tf-issues#244
Fixes ARM-software/tf-issues#245
Change-Id: I3ebe1d4901f8b857e8bb51372290978a3323bfe7
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