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doc: Split the User Guide into multiple files

Browse source 
The User Guide document has grown organically over time and
now covers a wide range of topics, making it difficult to
skim read and extract information from. Currently, it covers
these topics and maybe a couple more:

- Requirements (hardware, tools, libs)
- Checking out the repo
- Basic build instructions
- A comprehensive list of build flags
- FIP packaging
- Building specifically for Juno
- Firmware update images
- EL3 payloads
- Preloaded BL33 boot flow
- Running on FVPs
- Running on Juno

I have separated these out into a few groups that become new
documents. Broadly speaking, build instructions for the tools,
for TF-A generally, and for specific scenarios are separated.
Content relating to specific platforms (Juno and the FVPs are
Arm-specific platforms, essentially) has been moved into the
documentation that is specific to those platforms, under
docs/plat/arm.

Change-Id: Ica87c52d8cd4f577332be0b0738998ea3ba3bbec
Signed-off-by: Paul Beesley <paul.beesley@arm.com>
This commit is contained in:
Paul Beesley 2019-05-29 13:59:40 +01:00
parent d537ee795c
commit 43f35ef516
27 changed files with 2337 additions and 2325 deletions
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Build Options
=============
The TF-A build system supports the following build options. Unless mentioned
otherwise, these options are expected to be specified at the build command
line and are not to be modified in any component makefiles. Note that the
build system doesn't track dependency for build options. Therefore, if any of
the build options are changed from a previous build, a clean build must be
performed.
.. _build_options_common:
Common build options
--------------------
- ``AARCH32_INSTRUCTION_SET``: Choose the AArch32 instruction set that the
compiler should use. Valid values are T32 and A32. It defaults to T32 due to
code having a smaller resulting size.
- ``AARCH32_SP`` : Choose the AArch32 Secure Payload component to be built as
as the BL32 image when ``ARCH=aarch32``. The value should be the path to the
directory containing the SP source, relative to the ``bl32/``; the directory
is expected to contain a makefile called ``<aarch32_sp-value>.mk``.
- ``ARCH`` : Choose the target build architecture for TF-A. It can take either
``aarch64`` or ``aarch32`` as values. By default, it is defined to
``aarch64``.
- ``ARM_ARCH_MAJOR``: The major version of Arm Architecture to target when
compiling TF-A. Its value must be numeric, and defaults to 8 . See also,
*Armv8 Architecture Extensions* and *Armv7 Architecture Extensions* in
:ref:`Firmware Design`.
- ``ARM_ARCH_MINOR``: The minor version of Arm Architecture to target when
compiling TF-A. Its value must be a numeric, and defaults to 0. See also,
*Armv8 Architecture Extensions* in :ref:`Firmware Design`.
- ``BL2``: This is an optional build option which specifies the path to BL2
image for the ``fip`` target. In this case, the BL2 in the TF-A will not be
built.
- ``BL2U``: This is an optional build option which specifies the path to
BL2U image. In this case, the BL2U in TF-A will not be built.
- ``BL2_AT_EL3``: This is an optional build option that enables the use of
BL2 at EL3 execution level.
- ``BL2_IN_XIP_MEM``: In some use-cases BL2 will be stored in eXecute In Place
(XIP) memory, like BL1. In these use-cases, it is necessary to initialize
the RW sections in RAM, while leaving the RO sections in place. This option
enable this use-case. For now, this option is only supported when BL2_AT_EL3
is set to '1'.
- ``BL31``: This is an optional build option which specifies the path to
BL31 image for the ``fip`` target. In this case, the BL31 in TF-A will not
be built.
- ``BL31_KEY``: This option is used when ``GENERATE_COT=1``. It specifies the
file that contains the BL31 private key in PEM format. If ``SAVE_KEYS=1``,
this file name will be used to save the key.
- ``BL32``: This is an optional build option which specifies the path to
BL32 image for the ``fip`` target. In this case, the BL32 in TF-A will not
be built.
- ``BL32_EXTRA1``: This is an optional build option which specifies the path to
Trusted OS Extra1 image for the ``fip`` target.
- ``BL32_EXTRA2``: This is an optional build option which specifies the path to
Trusted OS Extra2 image for the ``fip`` target.
- ``BL32_KEY``: This option is used when ``GENERATE_COT=1``. It specifies the
file that contains the BL32 private key in PEM format. If ``SAVE_KEYS=1``,
this file name will be used to save the key.
- ``BL33``: Path to BL33 image in the host file system. This is mandatory for
``fip`` target in case TF-A BL2 is used.
- ``BL33_KEY``: This option is used when ``GENERATE_COT=1``. It specifies the
file that contains the BL33 private key in PEM format. If ``SAVE_KEYS=1``,
this file name will be used to save the key.
- ``BRANCH_PROTECTION``: Numeric value to enable ARMv8.3 Pointer Authentication
and ARMv8.5 Branch Target Identification support for TF-A BL images themselves.
If enabled, it is needed to use a compiler that supports the option
``-mbranch-protection``. Selects the branch protection features to use:
- 0: Default value turns off all types of branch protection
- 1: Enables all types of branch protection features
- 2: Return address signing to its standard level
- 3: Extend the signing to include leaf functions
The table below summarizes ``BRANCH_PROTECTION`` values, GCC compilation options
and resulting PAuth/BTI features.
+-------+--------------+-------+-----+
| Value | GCC option | PAuth | BTI |
+=======+==============+=======+=====+
| 0 | none | N | N |
+-------+--------------+-------+-----+
| 1 | standard | Y | Y |
+-------+--------------+-------+-----+
| 2 | pac-ret | Y | N |
+-------+--------------+-------+-----+
| 3 | pac-ret+leaf | Y | N |
+-------+--------------+-------+-----+
This option defaults to 0 and this is an experimental feature.
Note that Pointer Authentication is enabled for Non-secure world
irrespective of the value of this option if the CPU supports it.
- ``BUILD_MESSAGE_TIMESTAMP``: String used to identify the time and date of the
compilation of each build. It must be set to a C string (including quotes
where applicable). Defaults to a string that contains the time and date of
the compilation.
- ``BUILD_STRING``: Input string for VERSION_STRING, which allows the TF-A
build to be uniquely identified. Defaults to the current git commit id.
- ``CFLAGS``: Extra user options appended on the compiler's command line in
addition to the options set by the build system.
- ``COLD_BOOT_SINGLE_CPU``: This option indicates whether the platform may
release several CPUs out of reset. It can take either 0 (several CPUs may be
brought up) or 1 (only one CPU will ever be brought up during cold reset).
Default is 0. If the platform always brings up a single CPU, there is no
need to distinguish between primary and secondary CPUs and the boot path can
be optimised. The ``plat_is_my_cpu_primary()`` and
``plat_secondary_cold_boot_setup()`` platform porting interfaces do not need
to be implemented in this case.
- ``CRASH_REPORTING``: A non-zero value enables a console dump of processor
register state when an unexpected exception occurs during execution of
BL31. This option defaults to the value of ``DEBUG`` - i.e. by default
this is only enabled for a debug build of the firmware.
- ``CREATE_KEYS``: This option is used when ``GENERATE_COT=1``. It tells the
certificate generation tool to create new keys in case no valid keys are
present or specified. Allowed options are '0' or '1'. Default is '1'.
- ``CTX_INCLUDE_AARCH32_REGS`` : Boolean option that, when set to 1, will cause
the AArch32 system registers to be included when saving and restoring the
CPU context. The option must be set to 0 for AArch64-only platforms (that
is on hardware that does not implement AArch32, or at least not at EL1 and
higher ELs). Default value is 1.
- ``CTX_INCLUDE_FPREGS``: Boolean option that, when set to 1, will cause the FP
registers to be included when saving and restoring the CPU context. Default
is 0.
- ``CTX_INCLUDE_PAUTH_REGS``: Boolean option that, when set to 1, enables
Pointer Authentication for Secure world. This will cause the ARMv8.3-PAuth
registers to be included when saving and restoring the CPU context as
part of world switch. Default value is 0 and this is an experimental feature.
Note that Pointer Authentication is enabled for Non-secure world irrespective
of the value of this flag if the CPU supports it.
- ``DEBUG``: Chooses between a debug and release build. It can take either 0
(release) or 1 (debug) as values. 0 is the default.
- ``DISABLE_BIN_GENERATION``: Boolean option to disable the generation
of the binary image. If set to 1, then only the ELF image is built.
0 is the default.
- ``DYN_DISABLE_AUTH``: Provides the capability to dynamically disable Trusted
Board Boot authentication at runtime. This option is meant to be enabled only
for development platforms. ``TRUSTED_BOARD_BOOT`` flag must be set if this
flag has to be enabled. 0 is the default.
- ``E``: Boolean option to make warnings into errors. Default is 1.
- ``EL3_PAYLOAD_BASE``: This option enables booting an EL3 payload instead of
the normal boot flow. It must specify the entry point address of the EL3
payload. Please refer to the "Booting an EL3 payload" section for more
details.
- ``ENABLE_AMU``: Boolean option to enable Activity Monitor Unit extensions.
This is an optional architectural feature available on v8.4 onwards. Some
v8.2 implementations also implement an AMU and this option can be used to
enable this feature on those systems as well. Default is 0.
- ``ENABLE_ASSERTIONS``: This option controls whether or not calls to ``assert()``
are compiled out. For debug builds, this option defaults to 1, and calls to
``assert()`` are left in place. For release builds, this option defaults to 0
and calls to ``assert()`` function are compiled out. This option can be set
independently of ``DEBUG``. It can also be used to hide any auxiliary code
that is only required for the assertion and does not fit in the assertion
itself.
- ``ENABLE_BACKTRACE``: This option controls whether to enables backtrace
dumps or not. It is supported in both AArch64 and AArch32. However, in
AArch32 the format of the frame records are not defined in the AAPCS and they
are defined by the implementation. This implementation of backtrace only
supports the format used by GCC when T32 interworking is disabled. For this
reason enabling this option in AArch32 will force the compiler to only
generate A32 code. This option is enabled by default only in AArch64 debug
builds, but this behaviour can be overridden in each platform's Makefile or
in the build command line.
- ``ENABLE_MPAM_FOR_LOWER_ELS``: Boolean option to enable lower ELs to use MPAM
feature. MPAM is an optional Armv8.4 extension that enables various memory
system components and resources to define partitions; software running at
various ELs can assign themselves to desired partition to control their
performance aspects.
When this option is set to ``1``, EL3 allows lower ELs to access their own
MPAM registers without trapping into EL3. This option doesn't make use of
partitioning in EL3, however. Platform initialisation code should configure
and use partitions in EL3 as required. This option defaults to ``0``.
- ``ENABLE_PIE``: Boolean option to enable Position Independent Executable(PIE)
support within generic code in TF-A. This option is currently only supported
in BL31. Default is 0.
- ``ENABLE_PMF``: Boolean option to enable support for optional Performance
Measurement Framework(PMF). Default is 0.
- ``ENABLE_PSCI_STAT``: Boolean option to enable support for optional PSCI
functions ``PSCI_STAT_RESIDENCY`` and ``PSCI_STAT_COUNT``. Default is 0.
In the absence of an alternate stat collection backend, ``ENABLE_PMF`` must
be enabled. If ``ENABLE_PMF`` is set, the residency statistics are tracked in
software.
- ``ENABLE_RUNTIME_INSTRUMENTATION``: Boolean option to enable runtime
instrumentation which injects timestamp collection points into TF-A to
allow runtime performance to be measured. Currently, only PSCI is
instrumented. Enabling this option enables the ``ENABLE_PMF`` build option
as well. Default is 0.
- ``ENABLE_SPE_FOR_LOWER_ELS`` : Boolean option to enable Statistical Profiling
extensions. This is an optional architectural feature for AArch64.
The default is 1 but is automatically disabled when the target architecture
is AArch32.
- ``ENABLE_SPM`` : Boolean option to enable the Secure Partition Manager (SPM).
Refer to :ref:`Secure Partition Manager` for more details about
this feature. Default is 0.
- ``ENABLE_SVE_FOR_NS``: Boolean option to enable Scalable Vector Extension
(SVE) for the Non-secure world only. SVE is an optional architectural feature
for AArch64. Note that when SVE is enabled for the Non-secure world, access
to SIMD and floating-point functionality from the Secure world is disabled.
This is to avoid corruption of the Non-secure world data in the Z-registers
which are aliased by the SIMD and FP registers. The build option is not
compatible with the ``CTX_INCLUDE_FPREGS`` build option, and will raise an
assert on platforms where SVE is implemented and ``ENABLE_SVE_FOR_NS`` set to
1. The default is 1 but is automatically disabled when the target
architecture is AArch32.
- ``ENABLE_STACK_PROTECTOR``: String option to enable the stack protection
checks in GCC. Allowed values are "all", "strong", "default" and "none". The
default value is set to "none". "strong" is the recommended stack protection
level if this feature is desired. "none" disables the stack protection. For
all values other than "none", the ``plat_get_stack_protector_canary()``
platform hook needs to be implemented. The value is passed as the last
component of the option ``-fstack-protector-$ENABLE_STACK_PROTECTOR``.
- ``ERROR_DEPRECATED``: This option decides whether to treat the usage of
deprecated platform APIs, helper functions or drivers within Trusted
Firmware as error. It can take the value 1 (flag the use of deprecated
APIs as error) or 0. The default is 0.
- ``EL3_EXCEPTION_HANDLING``: When set to ``1``, enable handling of exceptions
targeted at EL3. When set ``0`` (default), no exceptions are expected or
handled at EL3, and a panic will result. This is supported only for AArch64
builds.
- ``FAULT_INJECTION_SUPPORT``: ARMv8.4 extensions introduced support for fault
injection from lower ELs, and this build option enables lower ELs to use
Error Records accessed via System Registers to inject faults. This is
applicable only to AArch64 builds.
This feature is intended for testing purposes only, and is advisable to keep
disabled for production images.
- ``FIP_NAME``: This is an optional build option which specifies the FIP
filename for the ``fip`` target. Default is ``fip.bin``.
- ``FWU_FIP_NAME``: This is an optional build option which specifies the FWU
FIP filename for the ``fwu_fip`` target. Default is ``fwu_fip.bin``.
- ``GENERATE_COT``: Boolean flag used to build and execute the ``cert_create``
tool to create certificates as per the Chain of Trust described in
:ref:`Trusted Board Boot`. The build system then calls ``fiptool`` to
include the certificates in the FIP and FWU_FIP. Default value is '0'.
Specify both ``TRUSTED_BOARD_BOOT=1`` and ``GENERATE_COT=1`` to include support
for the Trusted Board Boot feature in the BL1 and BL2 images, to generate
the corresponding certificates, and to include those certificates in the
FIP and FWU_FIP.
Note that if ``TRUSTED_BOARD_BOOT=0`` and ``GENERATE_COT=1``, the BL1 and BL2
images will not include support for Trusted Board Boot. The FIP will still
include the corresponding certificates. This FIP can be used to verify the
Chain of Trust on the host machine through other mechanisms.
Note that if ``TRUSTED_BOARD_BOOT=1`` and ``GENERATE_COT=0``, the BL1 and BL2
images will include support for Trusted Board Boot, but the FIP and FWU_FIP
will not include the corresponding certificates, causing a boot failure.
- ``GICV2_G0_FOR_EL3``: Unlike GICv3, the GICv2 architecture doesn't have
inherent support for specific EL3 type interrupts. Setting this build option
to ``1`` assumes GICv2 *Group 0* interrupts are expected to target EL3, both
by `platform abstraction layer`__ and `Interrupt Management Framework`__.
This allows GICv2 platforms to enable features requiring EL3 interrupt type.
This also means that all GICv2 Group 0 interrupts are delivered to EL3, and
the Secure Payload interrupts needs to be synchronously handed over to Secure
EL1 for handling. The default value of this option is ``0``, which means the
Group 0 interrupts are assumed to be handled by Secure EL1.
.. __: `platform-interrupt-controller-API.rst`
.. __: `interrupt-framework-design.rst`
- ``HANDLE_EA_EL3_FIRST``: When set to ``1``, External Aborts and SError
Interrupts will be always trapped in EL3 i.e. in BL31 at runtime. When set to
``0`` (default), these exceptions will be trapped in the current exception
level (or in EL1 if the current exception level is EL0).
- ``HW_ASSISTED_COHERENCY``: On most Arm systems to-date, platform-specific
software operations are required for CPUs to enter and exit coherency.
However, newer systems exist where CPUs' entry to and exit from coherency
is managed in hardware. Such systems require software to only initiate these
operations, and the rest is managed in hardware, minimizing active software
management. In such systems, this boolean option enables TF-A to carry out
build and run-time optimizations during boot and power management operations.
This option defaults to 0 and if it is enabled, then it implies
``WARMBOOT_ENABLE_DCACHE_EARLY`` is also enabled.
If this flag is disabled while the platform which TF-A is compiled for
includes cores that manage coherency in hardware, then a compilation error is
generated. This is based on the fact that a system cannot have, at the same
time, cores that manage coherency in hardware and cores that don't. In other
words, a platform cannot have, at the same time, cores that require
``HW_ASSISTED_COHERENCY=1`` and cores that require
``HW_ASSISTED_COHERENCY=0``.
Note that, when ``HW_ASSISTED_COHERENCY`` is enabled, version 2 of
translation library (xlat tables v2) must be used; version 1 of translation
library is not supported.
- ``JUNO_AARCH32_EL3_RUNTIME``: This build flag enables you to execute EL3
runtime software in AArch32 mode, which is required to run AArch32 on Juno.
By default this flag is set to '0'. Enabling this flag builds BL1 and BL2 in
AArch64 and facilitates the loading of ``SP_MIN`` and BL33 as AArch32 executable
images.
- ``KEY_ALG``: This build flag enables the user to select the algorithm to be
used for generating the PKCS keys and subsequent signing of the certificate.
It accepts 3 values: ``rsa``, ``rsa_1_5`` and ``ecdsa``. The option
``rsa_1_5`` is the legacy PKCS#1 RSA 1.5 algorithm which is not TBBR
compliant and is retained only for compatibility. The default value of this
flag is ``rsa`` which is the TBBR compliant PKCS#1 RSA 2.1 scheme.
- ``HASH_ALG``: This build flag enables the user to select the secure hash
algorithm. It accepts 3 values: ``sha256``, ``sha384`` and ``sha512``.
The default value of this flag is ``sha256``.
- ``LDFLAGS``: Extra user options appended to the linkers' command line in
addition to the one set by the build system.
- ``LOG_LEVEL``: Chooses the log level, which controls the amount of console log
output compiled into the build. This should be one of the following:
::
0 (LOG_LEVEL_NONE)
10 (LOG_LEVEL_ERROR)
20 (LOG_LEVEL_NOTICE)
30 (LOG_LEVEL_WARNING)
40 (LOG_LEVEL_INFO)
50 (LOG_LEVEL_VERBOSE)
All log output up to and including the selected log level is compiled into
the build. The default value is 40 in debug builds and 20 in release builds.
- ``NON_TRUSTED_WORLD_KEY``: This option is used when ``GENERATE_COT=1``. It
specifies the file that contains the Non-Trusted World private key in PEM
format. If ``SAVE_KEYS=1``, this file name will be used to save the key.
- ``NS_BL2U``: Path to NS_BL2U image in the host file system. This image is
optional. It is only needed if the platform makefile specifies that it
is required in order to build the ``fwu_fip`` target.
- ``NS_TIMER_SWITCH``: Enable save and restore for non-secure timer register
contents upon world switch. It can take either 0 (don't save and restore) or
1 (do save and restore). 0 is the default. An SPD may set this to 1 if it
wants the timer registers to be saved and restored.
- ``OVERRIDE_LIBC``: This option allows platforms to override the default libc
for the BL image. It can be either 0 (include) or 1 (remove). The default
value is 0.
- ``PL011_GENERIC_UART``: Boolean option to indicate the PL011 driver that
the underlying hardware is not a full PL011 UART but a minimally compliant
generic UART, which is a subset of the PL011. The driver will not access
any register that is not part of the SBSA generic UART specification.
Default value is 0 (a full PL011 compliant UART is present).
- ``PLAT``: Choose a platform to build TF-A for. The chosen platform name
must be subdirectory of any depth under ``plat/``, and must contain a
platform makefile named ``platform.mk``. For example, to build TF-A for the
Arm Juno board, select PLAT=juno.
- ``PRELOADED_BL33_BASE``: This option enables booting a preloaded BL33 image
instead of the normal boot flow. When defined, it must specify the entry
point address for the preloaded BL33 image. This option is incompatible with
``EL3_PAYLOAD_BASE``. If both are defined, ``EL3_PAYLOAD_BASE`` has priority
over ``PRELOADED_BL33_BASE``.
- ``PROGRAMMABLE_RESET_ADDRESS``: This option indicates whether the reset
vector address can be programmed or is fixed on the platform. It can take
either 0 (fixed) or 1 (programmable). Default is 0. If the platform has a
programmable reset address, it is expected that a CPU will start executing
code directly at the right address, both on a cold and warm reset. In this
case, there is no need to identify the entrypoint on boot and the boot path
can be optimised. The ``plat_get_my_entrypoint()`` platform porting interface
does not need to be implemented in this case.
- ``PSCI_EXTENDED_STATE_ID``: As per PSCI1.0 Specification, there are 2 formats
possible for the PSCI power-state parameter: original and extended State-ID
formats. This flag if set to 1, configures the generic PSCI layer to use the
extended format. The default value of this flag is 0, which means by default
the original power-state format is used by the PSCI implementation. This flag
should be specified by the platform makefile and it governs the return value
of PSCI_FEATURES API for CPU_SUSPEND smc function id. When this option is
enabled on Arm platforms, the option ``ARM_RECOM_STATE_ID_ENC`` needs to be
set to 1 as well.
- ``RAS_EXTENSION``: When set to ``1``, enable Armv8.2 RAS features. RAS features
are an optional extension for pre-Armv8.2 CPUs, but are mandatory for Armv8.2
or later CPUs.
When ``RAS_EXTENSION`` is set to ``1``, ``HANDLE_EA_EL3_FIRST`` must also be
set to ``1``.
This option is disabled by default.
- ``RESET_TO_BL31``: Enable BL31 entrypoint as the CPU reset vector instead
of the BL1 entrypoint. It can take the value 0 (CPU reset to BL1
entrypoint) or 1 (CPU reset to BL31 entrypoint).
The default value is 0.
- ``RESET_TO_SP_MIN``: SP_MIN is the minimal AArch32 Secure Payload provided
in TF-A. This flag configures SP_MIN entrypoint as the CPU reset vector
instead of the BL1 entrypoint. It can take the value 0 (CPU reset to BL1
entrypoint) or 1 (CPU reset to SP_MIN entrypoint). The default value is 0.
- ``ROT_KEY``: This option is used when ``GENERATE_COT=1``. It specifies the
file that contains the ROT private key in PEM format. If ``SAVE_KEYS=1``, this
file name will be used to save the key.
- ``SAVE_KEYS``: This option is used when ``GENERATE_COT=1``. It tells the
certificate generation tool to save the keys used to establish the Chain of
Trust. Allowed options are '0' or '1'. Default is '0' (do not save).
- ``SCP_BL2``: Path to SCP_BL2 image in the host file system. This image is optional.
If a SCP_BL2 image is present then this option must be passed for the ``fip``
target.
- ``SCP_BL2_KEY``: This option is used when ``GENERATE_COT=1``. It specifies the
file that contains the SCP_BL2 private key in PEM format. If ``SAVE_KEYS=1``,
this file name will be used to save the key.
- ``SCP_BL2U``: Path to SCP_BL2U image in the host file system. This image is
optional. It is only needed if the platform makefile specifies that it
is required in order to build the ``fwu_fip`` target.
- ``SDEI_SUPPORT``: Setting this to ``1`` enables support for Software
Delegated Exception Interface to BL31 image. This defaults to ``0``.
When set to ``1``, the build option ``EL3_EXCEPTION_HANDLING`` must also be
set to ``1``.
- ``SEPARATE_CODE_AND_RODATA``: Whether code and read-only data should be
isolated on separate memory pages. This is a trade-off between security and
memory usage. See "Isolating code and read-only data on separate memory
pages" section in :ref:`Firmware Design`. This flag is disabled by default and
affects all BL images.
- ``SPD``: Choose a Secure Payload Dispatcher component to be built into TF-A.
This build option is only valid if ``ARCH=aarch64``. The value should be
the path to the directory containing the SPD source, relative to
``services/spd/``; the directory is expected to contain a makefile called
``<spd-value>.mk``.
- ``SPIN_ON_BL1_EXIT``: This option introduces an infinite loop in BL1. It can
take either 0 (no loop) or 1 (add a loop). 0 is the default. This loop stops
execution in BL1 just before handing over to BL31. At this point, all
firmware images have been loaded in memory, and the MMU and caches are
turned off. Refer to the "Debugging options" section for more details.
- ``SP_MIN_WITH_SECURE_FIQ``: Boolean flag to indicate the SP_MIN handles
secure interrupts (caught through the FIQ line). Platforms can enable
this directive if they need to handle such interruption. When enabled,
the FIQ are handled in monitor mode and non secure world is not allowed
to mask these events. Platforms that enable FIQ handling in SP_MIN shall
implement the api ``sp_min_plat_fiq_handler()``. The default value is 0.
- ``TRUSTED_BOARD_BOOT``: Boolean flag to include support for the Trusted Board
Boot feature. When set to '1', BL1 and BL2 images include support to load
and verify the certificates and images in a FIP, and BL1 includes support
for the Firmware Update. The default value is '0'. Generation and inclusion
of certificates in the FIP and FWU_FIP depends upon the value of the
``GENERATE_COT`` option.
.. warning::
This option depends on ``CREATE_KEYS`` to be enabled. If the keys
already exist in disk, they will be overwritten without further notice.
- ``TRUSTED_WORLD_KEY``: This option is used when ``GENERATE_COT=1``. It
specifies the file that contains the Trusted World private key in PEM
format. If ``SAVE_KEYS=1``, this file name will be used to save the key.
- ``TSP_INIT_ASYNC``: Choose BL32 initialization method as asynchronous or
synchronous, (see "Initializing a BL32 Image" section in
:ref:`Firmware Design`). It can take the value 0 (BL32 is initialized using
synchronous method) or 1 (BL32 is initialized using asynchronous method).
Default is 0.
- ``TSP_NS_INTR_ASYNC_PREEMPT``: A non zero value enables the interrupt
routing model which routes non-secure interrupts asynchronously from TSP
to EL3 causing immediate preemption of TSP. The EL3 is responsible
for saving and restoring the TSP context in this routing model. The
default routing model (when the value is 0) is to route non-secure
interrupts to TSP allowing it to save its context and hand over
synchronously to EL3 via an SMC.
.. note::
When ``EL3_EXCEPTION_HANDLING`` is ``1``, ``TSP_NS_INTR_ASYNC_PREEMPT``
must also be set to ``1``.
- ``USE_ARM_LINK``: This flag determines whether to enable support for ARM
linker. When the ``LINKER`` build variable points to the armlink linker,
this flag is enabled automatically. To enable support for armlink, platforms
will have to provide a scatter file for the BL image. Currently, Tegra
platforms use the armlink support to compile BL3-1 images.
- ``USE_COHERENT_MEM``: This flag determines whether to include the coherent
memory region in the BL memory map or not (see "Use of Coherent memory in
TF-A" section in :ref:`Firmware Design`). It can take the value 1
(Coherent memory region is included) or 0 (Coherent memory region is
excluded). Default is 1.
- ``USE_ROMLIB``: This flag determines whether library at ROM will be used.
This feature creates a library of functions to be placed in ROM and thus
reduces SRAM usage. Refer to :ref:`Library at ROM` for further details. Default
is 0.
- ``V``: Verbose build. If assigned anything other than 0, the build commands
are printed. Default is 0.
- ``VERSION_STRING``: String used in the log output for each TF-A image.
Defaults to a string formed by concatenating the version number, build type
and build string.
- ``W``: Warning level. Some compiler warning options of interest have been
regrouped and put in the root Makefile. This flag can take the values 0 to 3,
each level enabling more warning options. Default is 0.
- ``WARMBOOT_ENABLE_DCACHE_EARLY`` : Boolean option to enable D-cache early on
the CPU after warm boot. This is applicable for platforms which do not
require interconnect programming to enable cache coherency (eg: single
cluster platforms). If this option is enabled, then warm boot path
enables D-caches immediately after enabling MMU. This option defaults to 0.
Debugging options
-----------------
To compile a debug version and make the build more verbose use
.. code:: shell
make PLAT=<platform> DEBUG=1 V=1 all
AArch64 GCC uses DWARF version 4 debugging symbols by default. Some tools (for
example DS-5) might not support this and may need an older version of DWARF
symbols to be emitted by GCC. This can be achieved by using the
``-gdwarf-<version>`` flag, with the version being set to 2 or 3. Setting the
version to 2 is recommended for DS-5 versions older than 5.16.
When debugging logic problems it might also be useful to disable all compiler
optimizations by using ``-O0``.
.. warning::
Using ``-O0`` could cause output images to be larger and base addresses
might need to be recalculated (see the **Memory layout on Arm development
platforms** section in the :ref:`Firmware Design`).
Extra debug options can be passed to the build system by setting ``CFLAGS`` or
``LDFLAGS``:
.. code:: shell
CFLAGS='-O0 -gdwarf-2' \
make PLAT=<platform> DEBUG=1 V=1 all
Note that using ``-Wl,`` style compilation driver options in ``CFLAGS`` will be
ignored as the linker is called directly.
It is also possible to introduce an infinite loop to help in debugging the
post-BL2 phase of TF-A. This can be done by rebuilding BL1 with the
``SPIN_ON_BL1_EXIT=1`` build flag. Refer to the :ref:`build_options_common`
section. In this case, the developer may take control of the target using a
debugger when indicated by the console output. When using DS-5, the following
commands can be used:
::
# Stop target execution
interrupt
#
# Prepare your debugging environment, e.g. set breakpoints
#
# Jump over the debug loop
set var $AARCH64::$Core::$PC = $AARCH64::$Core::$PC + 4
# Resume execution
continue
--------------
*Copyright (c) 2019, Arm Limited. All rights reserved.*

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@ -22,6 +22,9 @@ For building a local copy of the |TF-A| documentation you will need, at minimum:
- Python 3 (3.5 or later)
- PlantUML (1.2017.15 or later)
Optionally, the `Dia`_ application can be installed if you need to edit
existing ``.dia`` diagram files, or create new ones.
You must also install the Python modules that are specified in the
``requirements.txt`` file in the root of the ``docs`` directory. These modules
can be installed using ``pip3`` (the Python Package Installer). Passing this
@ -33,7 +36,7 @@ that the working directory is ``docs``:
.. code:: shell
sudo apt install python3 python3-pip plantuml
sudo apt install python3 python3-pip plantuml [dia]
pip3 install [--user] -r requirements.txt
.. note::
@ -75,3 +78,4 @@ Output from the build process will be placed in:
.. _Sphinx: http://www.sphinx-doc.org/en/master/
.. _pip homepage: https://pip.pypa.io/en/stable/
.. _Dia: https://wiki.gnome.org/Apps/Dia

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@ -6,9 +6,16 @@ Getting Started
:caption: Contents
:numbered:
user-guide
prerequisites
docs-build
tools-build
initial-build
build-options
image-terminology
porting-guide
psci-lib-integration-guide
rt-svc-writers-guide
--------------
*Copyright (c) 2019, Arm Limited. All rights reserved.*

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@ -0,0 +1,117 @@
Performing an Initial Build
===========================
- Before building TF-A, the environment variable ``CROSS_COMPILE`` must point
to the Linaro cross compiler.
For AArch64:
.. code:: shell
export CROSS_COMPILE=<path-to-aarch64-gcc>/bin/aarch64-linux-gnu-
For AArch32:
.. code:: shell
export CROSS_COMPILE=<path-to-aarch32-gcc>/bin/arm-eabi-
It is possible to build TF-A using Clang or Arm Compiler 6. To do so
``CC`` needs to point to the clang or armclang binary, which will
also select the clang or armclang assembler. Be aware that the
GNU linker is used by default. In case of being needed the linker
can be overridden using the ``LD`` variable. Clang linker version 6 is
known to work with TF-A.
In both cases ``CROSS_COMPILE`` should be set as described above.
Arm Compiler 6 will be selected when the base name of the path assigned
to ``CC`` matches the string 'armclang'.
For AArch64 using Arm Compiler 6:
.. code:: shell
export CROSS_COMPILE=<path-to-aarch64-gcc>/bin/aarch64-linux-gnu-
make CC=<path-to-armclang>/bin/armclang PLAT=<platform> all
Clang will be selected when the base name of the path assigned to ``CC``
contains the string 'clang'. This is to allow both clang and clang-X.Y
to work.
For AArch64 using clang:
.. code:: shell
export CROSS_COMPILE=<path-to-aarch64-gcc>/bin/aarch64-linux-gnu-
make CC=<path-to-clang>/bin/clang PLAT=<platform> all
- Change to the root directory of the TF-A source tree and build.
For AArch64:
.. code:: shell
make PLAT=<platform> all
For AArch32:
.. code:: shell
make PLAT=<platform> ARCH=aarch32 AARCH32_SP=sp_min all
Notes:
- If ``PLAT`` is not specified, ``fvp`` is assumed by default. See the
:ref:`Build Options` document for more information on available build
options.
- (AArch32 only) Currently only ``PLAT=fvp`` is supported.
- (AArch32 only) ``AARCH32_SP`` is the AArch32 EL3 Runtime Software and it
corresponds to the BL32 image. A minimal ``AARCH32_SP``, sp_min, is
provided by TF-A to demonstrate how PSCI Library can be integrated with
an AArch32 EL3 Runtime Software. Some AArch32 EL3 Runtime Software may
include other runtime services, for example Trusted OS services. A guide
to integrate PSCI library with AArch32 EL3 Runtime Software can be found
at :ref:`PSCI Library Integration guide for Armv8-A AArch32 systems`.
- (AArch64 only) The TSP (Test Secure Payload), corresponding to the BL32
image, is not compiled in by default. Refer to the
:ref:`Test Secure Payload (TSP) and Dispatcher (TSPD)` document for
details on building the TSP.
- By default this produces a release version of the build. To produce a
debug version instead, refer to the "Debugging options" section below.
- The build process creates products in a ``build`` directory tree, building
the objects and binaries for each boot loader stage in separate
sub-directories. The following boot loader binary files are created
from the corresponding ELF files:
- ``build/<platform>/<build-type>/bl1.bin``
- ``build/<platform>/<build-type>/bl2.bin``
- ``build/<platform>/<build-type>/bl31.bin`` (AArch64 only)
- ``build/<platform>/<build-type>/bl32.bin`` (mandatory for AArch32)
where ``<platform>`` is the name of the chosen platform and ``<build-type>``
is either ``debug`` or ``release``. The actual number of images might differ
depending on the platform.
- Build products for a specific build variant can be removed using:
.. code:: shell
make DEBUG=<D> PLAT=<platform> clean
... where ``<D>`` is ``0`` or ``1``, as specified when building.
The build tree can be removed completely using:
.. code:: shell
make realclean
--------------
*Copyright (c) 2019, Arm Limited. All rights reserved.*

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@ -23,8 +23,6 @@ Some modifications are common to all Boot Loader (BL) stages. Section 2
discusses these in detail. The subsequent sections discuss the remaining
modifications for each BL stage in detail.
This document should be read in conjunction with the TF-A :ref:`User Guide`.
Please refer to the :ref:`Platform Compatibility Policy` for the policy
regarding compatibility and deprecation of these porting interfaces.
@ -2387,8 +2385,8 @@ present in the platform. Arm standard platform layer supports both
`Arm Generic Interrupt Controller version 2.0 (GICv2)`_
and `3.0 (GICv3)`_. Juno builds the Arm platform layer to use GICv2 and the
FVP can be configured to use either GICv2 or GICv3 depending on the build flag
``FVP_USE_GIC_DRIVER`` (See FVP platform specific build options in
:ref:`User Guide` for more details).
``FVP_USE_GIC_DRIVER`` (See :ref:`build_options_arm_fvp_platform` for more
details).
See also: `Interrupt Controller Abstraction APIs`__.
@ -2796,10 +2794,10 @@ storage access is only required by BL1 and BL2 phases and performed inside the
It is mandatory to implement at least one storage driver. For the Arm
development platforms the Firmware Image Package (FIP) driver is provided as
the default means to load data from storage (see the "Firmware Image Package"
section in the :ref:`User Guide`). The storage layer is described in the header file
``include/drivers/io/io_storage.h``. The implementation of the common library
is in ``drivers/io/io_storage.c`` and the driver files are located in
the default means to load data from storage (see :ref:`firmware_design_fip`).
The storage layer is described in the header file
``include/drivers/io/io_storage.h``. The implementation of the common library is
in ``drivers/io/io_storage.c`` and the driver files are located in
``drivers/io/``.
.. uml:: ../resources/diagrams/plantuml/io_arm_class_diagram.puml

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@ -0,0 +1,136 @@
Prerequisites
=============
This document describes the software requirements for building |TF-A| for
AArch32 and AArch64 target platforms.
It may possible to build |TF-A| with combinations of software packages that are
different from those listed below, however only the software described in this
document can be officially supported.
Build Host
----------
|TF-A| can be built using either a Linux or a Windows machine as the build host.
A relatively recent Linux distribution is recommended for building |TF-A|. We
have performed tests using Ubuntu 16.04 LTS (64-bit) but other distributions
should also work fine as a base, provided that the necessary tools and libraries
can be installed.
.. _prerequisites_toolchain:
Toolchain
---------
|TF-A| can be built with any of the following *cross-compiler* toolchains that
target the Armv7-A or Armv8-A architectures:
- GCC >= 8.3-2019.03 (from the `Arm Developer website`_)
- Clang >= 4.0
- Arm Compiler >= 6.0
In addition, a native compiler is required to build the supporting tools.
.. note::
The software has also been built on Windows 7 Enterprise SP1, using CMD.EXE,
Cygwin, and Msys (MinGW) shells, using version 5.3.1 of the GNU toolchain.
.. note::
For instructions on how to select the cross compiler refer to
:ref:`Performing an Initial Build`.
.. _prerequisites_software_and_libraries:
Software and Libraries
----------------------
The following tools are required to obtain and build |TF-A|:
- An appropriate toolchain (see :ref:`prerequisites_toolchain`)
- GNU Make
- Git
The following libraries must be available to build one or more components or
supporting tools:
- OpenSSL >= 1.0.1
Required to build the cert_create tool.
The following libraries are required for Trusted Board Boot support:
- mbed TLS == 2.16.2 (tag: ``mbedtls-2.16.2``)
These tools are optional:
- Device Tree Compiler (DTC) >= 1.4.6
Needed if you want to rebuild the provided Flattened Device Tree (FDT)
source files (``.dts`` files). DTC is available for Linux through the package
repositories of most distributions.
- Arm `Development Studio 5 (DS-5)`_
The standard software package used for debugging software on Arm development
platforms and |FVP| models.
Package Installation (Linux)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
If you are using the recommended Ubuntu distribution then you can install the
required packages with the following command:
.. code:: shell
sudo apt install build-essential git libssl-dev
The optional packages can be installed using:
.. code:: shell
sudo apt install device-tree-compiler
Supporting Files
----------------
TF-A has been tested with pre-built binaries and file systems from `Linaro
Release 19.06`_. Alternatively, you can build the binaries from source using
instructions in :ref:`Performing an Initial Build`.
.. _prerequisites_get_source:
Getting the TF-A Source
-----------------------
Source code for |TF-A| is maintained in a Git repository hosted on
TrustedFirmware.org. To clone this repository from the server, run the following
in your shell:
.. code:: shell
git clone "https://review.trustedfirmware.org/TF-A/trusted-firmware-a" && (cd "trusted-firmware-a" && mkdir -p .git/hooks && curl -Lo `git rev-parse --git-dir`/hooks/commit-msg https://review.trustedfirmware.org/tools/hooks/commit-msg; chmod +x `git rev-parse --git-dir`/hooks/commit-msg)
This will clone the Git repository also install a *commit hook* that
automatically inserts appropriate *Change-Id:* lines at the end of your
commit messages. These change IDs are required when committing changes that you
intend to push for review via our Gerrit system.
You can read more about Git hooks in the *githooks* page of the Git documentation,
available at: https://git-scm.com/docs/githooks
Alternatively, you can clone without the commit hook using:
.. code:: shell
git clone "https://review.trustedfirmware.org/TF-A/trusted-firmware-a"
--------------
*Copyright (c) 2019, Arm Limited. All rights reserved.*
.. _Arm Developer website: https://developer.arm.com/open-source/gnu-toolchain/gnu-a/downloads
.. _Linaro Release Notes: https://community.arm.com/dev-platforms/w/docs/226/old-release-notes
.. _Linaro instructions: https://community.arm.com/dev-platforms/w/docs/304/arm-reference-platforms-deliverables
.. _Development Studio 5 (DS-5): https://developer.arm.com/products/software-development-tools/ds-5-development-studio
.. _Linaro Release 19.06: http://releases.linaro.org/members/arm/platforms/19.06

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Building Supporting Tools
=========================
Building and using the FIP tool
-------------------------------
Firmware Image Package (FIP) is a packaging format used by TF-A to package
firmware images in a single binary. The number and type of images that should
be packed in a FIP is platform specific and may include TF-A images and other
firmware images required by the platform. For example, most platforms require
a BL33 image which corresponds to the normal world bootloader (e.g. UEFI or
U-Boot).
The TF-A build system provides the make target ``fip`` to create a FIP file
for the specified platform using the FIP creation tool included in the TF-A
project. Examples below show how to build a FIP file for FVP, packaging TF-A
and BL33 images.
For AArch64:
.. code:: shell
make PLAT=fvp BL33=<path-to>/bl33.bin fip
For AArch32:
.. code:: shell
make PLAT=fvp ARCH=aarch32 AARCH32_SP=sp_min BL33=<path-to>/bl33.bin fip
The resulting FIP may be found in:
::
build/fvp/<build-type>/fip.bin
For advanced operations on FIP files, it is also possible to independently build
the tool and create or modify FIPs using this tool. To do this, follow these
steps:
It is recommended to remove old artifacts before building the tool:
.. code:: shell
make -C tools/fiptool clean
Build the tool:
.. code:: shell
make [DEBUG=1] [V=1] fiptool
The tool binary can be located in:
::
./tools/fiptool/fiptool
Invoking the tool with ``help`` will print a help message with all available
options.
Example 1: create a new Firmware package ``fip.bin`` that contains BL2 and BL31:
.. code:: shell
./tools/fiptool/fiptool create \
--tb-fw build/<platform>/<build-type>/bl2.bin \
--soc-fw build/<platform>/<build-type>/bl31.bin \
fip.bin
Example 2: view the contents of an existing Firmware package:
.. code:: shell
./tools/fiptool/fiptool info <path-to>/fip.bin
Example 3: update the entries of an existing Firmware package:
.. code:: shell
# Change the BL2 from Debug to Release version
./tools/fiptool/fiptool update \
--tb-fw build/<platform>/release/bl2.bin \
build/<platform>/debug/fip.bin
Example 4: unpack all entries from an existing Firmware package:
.. code:: shell
# Images will be unpacked to the working directory
./tools/fiptool/fiptool unpack <path-to>/fip.bin
Example 5: remove an entry from an existing Firmware package:
.. code:: shell
./tools/fiptool/fiptool remove \
--tb-fw build/<platform>/debug/fip.bin
Note that if the destination FIP file exists, the create, update and
remove operations will automatically overwrite it.
The unpack operation will fail if the images already exist at the
destination. In that case, use -f or --force to continue.
More information about FIP can be found in the :ref:`Firmware Design` document.
.. _tools_build_cert_create:
Building the Certificate Generation Tool
----------------------------------------
The ``cert_create`` tool is built as part of the TF-A build process when the
``fip`` make target is specified and TBB is enabled (as described in the
previous section), but it can also be built separately with the following
command:
.. code:: shell
make PLAT=<platform> [DEBUG=1] [V=1] certtool
For platforms that require their own IDs in certificate files, the generic
'cert_create' tool can be built with the following command. Note that the target
platform must define its IDs within a ``platform_oid.h`` header file for the
build to succeed.
.. code:: shell
make PLAT=<platform> USE_TBBR_DEFS=0 [DEBUG=1] [V=1] certtool
``DEBUG=1`` builds the tool in debug mode. ``V=1`` makes the build process more
verbose. The following command should be used to obtain help about the tool:
.. code:: shell
./tools/cert_create/cert_create -h
--------------
*Copyright (c) 2019, Arm Limited. All rights reserved.*

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