Building TF-A Tests
===================

-  Before building TF-A Tests, the environment variable ``CROSS_COMPILE`` must
   point to the cross compiler.

   For AArch64:

   ::

       export CROSS_COMPILE=<path-to-aarch64-gcc>/bin/aarch64-none-elf-

   For AArch32:

   ::

       export CROSS_COMPILE=<path-to-aarch32-gcc>/bin/arm-eabi-

-  Change to the root directory of the TF-A Tests source tree and build.

   For AArch64:

   ::

       make PLAT=<platform>

   For AArch32:

   ::

       make PLAT=<platform> ARCH=aarch32

   Notes:

   -  If ``PLAT`` is not specified, ``fvp`` is assumed by default. See the
      `TF-A documentation`_ for more information on available build
      options.

   -  By default this produces a release version of the build. To produce a
      debug version instead, build the code with ``DEBUG=1``.

   -  The build process creates products in a ``build/`` directory tree,
      building the objects and binaries for each test image in separate
      sub-directories. The following binary files are created from the
      corresponding ELF files:

      -  ``build/<platform>/<build-type>/tftf.bin``
      -  ``build/<platform>/<build-type>/ns_bl1u.bin``
      -  ``build/<platform>/<build-type>/ns_bl2u.bin``
      -  ``build/<platform>/<build-type>/el3_payload.bin``
      -  ``build/<platform>/<build-type>/cactus_mm.bin``
      -  ``build/<platform>/<build-type>/cactus.bin``
      -  ``build/<platform>/<build-type>/ivy.bin``
      -  ``build/<platform>/<build-type>/quark.bin``

      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.

      Refer to the sections below for more information about each image.

-  Build products for a specific build variant can be removed using:

   ::

       make DEBUG=<D> PLAT=<platform> clean

   ... where ``<D>`` is ``0`` or ``1``, as specified when building.

   The build tree can be removed completely using:

   ::

       make realclean

-  Use the following command to list all supported build commands:

   ::

       make help

TFTF test image
```````````````

``tftf.bin`` is the main test image to exercise the TF-A features. The other
test images provided in this repository are optional dependencies that TFTF
needs to test some specific features.

``tftf.bin`` may be built independently of the other test images using the
following command:

::

   make PLAT=<platform> tftf

In TF-A boot flow, ``tftf.bin`` replaces the ``BL33`` image and should be
injected in the FIP image. This might be achieved by running the following
command from the TF-A root directory:

::

    BL33=<path/to/tftf.bin> make PLAT=<platform> fip

Please refer to the `TF-A documentation`_ for further details.

NS_BL1U and NS_BL2U test images
```````````````````````````````

``ns_bl1u.bin`` and ``ns_bl2u.bin`` are test images that exercise the *Firmware
Update (FWU)* feature of TF-A [#]_. Throughout this document, they will be
referred as the *FWU test images*.

In addition to updating the firmware, the FWU test images also embed some tests
that exercise the FWU state machine implemented in the TF-A. They send valid
and invalid SMC requests to the TF-A BL1 image in order to test its robustness.

NS_BL1U test image
''''''''''''''''''

The ``NS_BL1U`` image acts as the `Application Processor (AP) Firmware Update
Boot ROM`. This typically is the first software agent executing on the AP in the
Normal World during a firmware update operation. Its primary purpose is to load
subsequent firmware update images from an external interface, such as NOR Flash,
and communicate with ``BL1`` to authenticate those images.

The ``NS_BL1U`` test image provided in this repository performs the following
tasks:

-  Load FWU images from external non-volatile storage (typically flash memory)
   to Non-Secure RAM.

-  Request TF-A BL1 to copy these images in Secure RAM and authenticate them.

-  Jump to ``NS_BL2U`` which carries out the next steps in the firmware update
   process.

This image may be built independently of the other test images using the
following command:

::

   make PLAT=<platform> ns_bl1u

NS_BL2U test image
''''''''''''''''''

The ``NS_BL2U`` image acts as the `AP Firmware Updater`. Its primary
responsibility is to load a new set of firmware images from an external
interface and write them into non-volatile storage.

The ``NS_BL2U`` test image provided in this repository overrides the original
FIP image stored in flash with the backup FIP image (see below).

This image may be built independently of the other test images using the
following command:

::

   make PLAT=<platform> ns_bl2u

.. _build_putting_together:

Putting it all together
'''''''''''''''''''''''

The FWU test images should be used in conjunction with the TFTF image, as the
latter initiates the FWU process by corrupting the FIP image and resetting the
target. Once the FWU process is complete, TFTF takes over again and checks that
the firmware was successfully updated.

To sum up, 3 images must be built out of the TF-A Tests repository in order to
test the TF-A Firmware Update feature:

-  ``ns_bl1u.bin``
-  ``ns_bl2u.bin``
-  ``tftf.bin``

Once that's done, they must be combined in the right way.

-  ``ns_bl1u.bin`` is a standalone image and does not require any further
   processing.

-  ``ns_bl2u.bin`` must be injected into the ``FWU_FIP`` image. This might be
   achieved by setting ``NS_BL2U=ns_bl2u.bin`` when building the ``FWU_FIP``
   image out of the TF-A repository. Please refer to the section Building FIP
   images with support for Trusted Board Boot in the `TF-A documentation`_.

-  ``tftf.bin`` must be injected in the standard FIP image, as explained
   in section `TFTF test image`_.

Additionally, on Juno platform, the FWU FIP must contain a ``SCP_BL2U`` image.
This image can simply be a copy of the standard ``SCP_BL2`` image if no specific
firmware update operations need to be carried on the SCP side.

Finally, the backup FIP image must be created. This can simply be a copy of the
standard FIP image, which means that the Firmware Update process will restore
the original, uncorrupted FIP image.

EL3 test payload
````````````````

``el3_payload.bin`` is a test image exercising the alternative EL3 payload boot
flow in TF-A. Refer to the `EL3 test payload README file`_ for more details
about its behaviour and how to build and run it.

SPM test images
```````````````

This repository contains 3 Secure Partitions that exercise the Secure Partition
Manager (SPM) in TF-A [#]_. Cactus-MM is designed to test the SPM
implementation based on the `ARM Management Mode Interface`_ (MM), while Cactus
and Ivy can test the SPM implementation based on the SPCI and SPRT draft
specifications. Note that it isn't possible to use both communication mechanisms
at once: If Cactus-MM is used Cactus and Ivy can't be used.

They run in Secure-EL0 and perform the following tasks:

-  Test that TF-A has correctly setup the secure partition environment: They
   should be allowed to perform cache maintenance operations, access floating
   point registers, etc.

-  Test that TF-A accepts to change data access permissions and instruction
   permissions on behalf of the Secure Partitions for memory regions the latter
   owns.

-  Test communication with SPM through either MM, or both SPCI and SPRT.

They are only supported on AArch64 FVP. They can be built independently of the
other test images using the following command:

::

   make PLAT=fvp cactus ivy cactus_mm

In the TF-A boot flow, the partitions replace the ``BL32`` image and should be
injected in the FIP image. To test SPM-MM with Cactus-MM, it is enough to use
``cactus_mm.bin`` as BL32 image. To test the SPM based on SPCI and SPRT, it is
needed to use ``sp_tool`` to build a Secure Partition package that can be used
as BL32 image.

To run the full set of tests in the Secure Partitions, they should be used in
conjunction with the TFTF image.

For SPM-MM, build TF-A following the `TF-A SPM User Guide`_ and the following
commands can be used to build the tests:

::

    # TF-A-Tests repository:

    make PLAT=fvp TESTS=spm-mm tftf cactus_mm

For SPM based on SPCI and SPRT, build TF-A following the `TF-A SPM User Guide`_
and the following commands can be used to build the tests:

::

    # TF-A-Tests repository:

    make PLAT=fvp TESTS=spm tftf cactus ivy

    # TF-A repository:

    make sptool

    tools/sptool/sptool -o sp_package.bin \
        -i path/to/cactus.bin:path/to/cactus.dtb \
        -i path/to/ivy.bin:path/to/ivy.dtb

Please refer to the `TF-A documentation`_ for further details.

--------------

.. [#] Therefore, the Trusted Board Boot feature must be enabled in TF-A for
       the FWU test images to work. Please refer the `TF-A documentation`_ for
       further details.

.. [#] Therefore, the Secure Partition Manager must be enabled in TF-A for
       any of the test Secure Partitions to work. Please refer to the
       `TF-A documentation`_ for further details.

--------------

*Copyright (c) 2019, Arm Limited. All rights reserved.*

.. _EL3 test payload README file: https://git.trustedfirmware.org/TF-A/tf-a-tests.git/tree/el3_payload/README
.. _ARM Management Mode Interface: http://infocenter.arm.com/help/topic/com.arm.doc.den0060a/DEN0060A_ARM_MM_Interface_Specification.pdf
.. _TF-A documentation: https://trustedfirmware-a.readthedocs.org
.. _TF-A SPM User Guide: https://trustedfirmware-a.readthedocs.io/en/latest/components/secure-partition-manager-design.html#building-tf-a-with-secure-partition-support