First Things First


Trusted Firmware M provides a reference implementation of platform security architecture reference implementation aligning with PSA Certified guidelines. It is assumed that the reader is familiar with specifications can be found at Platform Security Architecture Resources.

The current TF-M implementation specifically targets TrustZone for ARMv8-M so a good understanding of the v8-M architecture is also necessary. A good place to get started with ARMv8-M is

Build and run instructions

Trusted Firmware M source code is available on

To build & run TF-M:

To port TF-M to a another system or OS, follow the OS Integration Guide

Contributing Guidelines contains guidance on how to contribute to this project.

Set up build environments

TF-M officially supports a limited set of build environments and setups. In this context, official support means that the environments listed below are actively used by team members and active developers, hence users should be able to recreate the same configurations by following the instructions described below. In case of problems, the TF-M team provides support only for these environments, but building in other environments can still be possible.

The following environments are supported:

  1. version supported:

    Ubuntu 18.04 x64+

  2. install dependencies:

sudo apt-get install -y git curl wget build-essential libssl-dev python3 \
python3-pip cmake make
  1. verify cmake version:

cmake --version


Please download cmake 3.15 or later version from

  1. add CMake path into environment:

export PATH=<CMake path>/bin:$PATH

Install python dependencies

Clone the TF-M source code, and then install the TF-M’s additional Python dependencies.

  1. get the TF-M source code:

cd <base folder>
git clone
  1. TF-M’s tools/requirements.txt file declares additional Python dependencies. Install them with pip3:

pip3 install --upgrade pip
cd trusted-firmware-m
pip3 install -r tools/requirements.txt

Install a toolchain

To compile TF-M code, at least one of the supported compiler toolchains have to be available in the build environment. The currently supported compiler versions are:

  • Arm Compiler v6.10.1 ~ v6.14, v6.18+

    • Download the standalone packages from here.

    • Add Arm Compiler into environment:

      export PATH=<ARM_CLANG_PATH>/bin:$PATH
      export ARM_PRODUCT_PATH=<ARM_CLANG_PATH>/sw/mappings
    • Configure proper tool variant and license.


    Arm compiler v6.15 ~ v6.17 may cause MemManage fault. This defect has been fixed since Arm compiler v6.18. See [SDCOMP-59788] in Armclang v6.18 release note for details.

  • GNU Arm compiler v7.3.1+

    • Download the GNU Arm compiler from here.

    • Add GNU Arm into environment:

      export PATH=<GNU_ARM_PATH>/bin:$PATH


    GNU Arm compiler version 10-2020-q4-major has an issue in CMSE support. The bug is reported in here. Select other GNU Arm compiler versions instead.

  • IAR Arm compiler v8.42.x, v8.50.x

    • Download IAR build tools from here.

    • Add IAR Arm compiler into environment:

      export PATH=<IAR_COMPILER_PATH>/bin:$PATH

Build AN521 regression sample

Here, we take building TF-M for AN521 platform with regression tests using GCC as an example:

cd trusted-firmware-m
cmake -S . -B cmake_build -DTFM_PLATFORM=arm/mps2/an521 -DTFM_TOOLCHAIN_FILE=toolchain_GNUARM.cmake -DCMAKE_BUILD_TYPE=Debug -DTEST_S=ON -DTEST_NS=ON
cmake --build cmake_build -- install

Alternately using traditional cmake syntax

cd trusted-firmware-m
mkdir cmake_build
cd cmake_build
cmake .. -DTFM_PLATFORM=arm/mps2/an521 -DTFM_TOOLCHAIN_FILE=../toolchain_GNUARM.cmake -DTEST_S=ON -DTEST_NS=ON
make install

Run AN521 regression sample

Run the sample code on SSE-200 Fast-Model, using FVP_MPS2_AEMv8M provided by Arm Development Studio.


Arm Development Studio is not essential to develop TF-M, you can skip this section if don’t want to try on Arm develop boards.

  1. install Arm Development Studio to get the fast-model.

    Download Arm Development Studio from here.

  2. Add bl2.axf and tfm_s_ns_signed.bin to symbol files in Debug Configuration menu.

<DS_PATH>/sw/models/bin/FVP_MPS2_AEMv8M  \
--parameter fvp_mps2.platform_type=2 \
--parameter cpu0.baseline=0 \
--parameter cpu0.INITVTOR_S=0x10000000 \
--parameter cpu0.semihosting-enable=0 \
--parameter fvp_mps2.DISABLE_GATING=0 \
--parameter fvp_mps2.telnetterminal0.start_telnet=1 \
--parameter fvp_mps2.telnetterminal1.start_telnet=0 \
--parameter fvp_mps2.telnetterminal2.start_telnet=0 \
--parameter fvp_mps2.telnetterminal0.quiet=0 \
--parameter fvp_mps2.telnetterminal1.quiet=1 \
--parameter fvp_mps2.telnetterminal2.quiet=1 \
--application cpu0=<build_dir>/bin/bl2.axf \
--data cpu0=<build_dir>/bin/tfm_s_ns_signed.bin@0x10080000

After completing the procedure you should see the following messages on the DAPLink UART (baud 115200 8n1):

[INF] Starting bootloader
[INF] Image 0: magic=good, copy_done=0xff, image_ok=0xff
[INF] Scratch: magic=bad, copy_done=0x5, image_ok=0x9
[INF] Boot source: primary slot
[INF] Swap type: none
[INF] Bootloader chainload address offset: 0x20000
[INF] Jumping to the first image slot
[Sec Thread] Secure image initializing!

#### Execute test suites for the protected storage service ####
Running Test Suite PS secure interface tests (TFM_PS_TEST_2XXX)...
> Executing 'TFM_PS_TEST_2001'
  Description: 'Create interface'
> Executing 'TFM_PS_TEST_2002'
  Description: 'Get handle interface (DEPRECATED)'
This test is DEPRECATED and the test execution was SKIPPED
> Executing 'TFM_PS_TEST_2003'
  Description: 'Get handle with null handle pointer (DEPRECATED)'
This test is DEPRECATED and the test execution was SKIPPED
> Executing 'TFM_PS_TEST_2004'
  Description: 'Get attributes interface'
> Executing 'TFM_PS_TEST_2005'
  Description: 'Get attributes with null attributes struct pointer'

Tool & Dependency overview

To build the TF-M firmware the following tools are needed:

  • C compiler of supported toolchains

  • CMake version 3.15 or later

  • Git

  • gmake, aka GNU Make

  • Python v3.x

  • a set of python modules listed in tools/requiremtns.txt

Dependency chain

 skinparam state {
   BackgroundColor #92AEE0
   FontColor black
   FontSize 16
   AttributeFontColor black
   AttributeFontSize 16
 state fw as "Firmware" : TF-M binary
 state c_comp as "C Compiler" : C99
 state python as "Python" : v3.x

 fw --> c_comp
 fw --> CMake
 CMake --> gmake
 CMake --> Ninja
 fw --> cryptography
 fw --> pyasn1
 fw --> yaml
 fw --> jinja2
 fw --> cbor2
 fw --> click
 fw --> imgtool
 c_comp --> GCC
 c_comp --> CLANG
 c_comp --> IAR
 cryptography --> python
 pyasn1 --> python
 yaml --> python
 jinja2 --> python
 cbor2 --> python
 click --> python
 imgtool --> python
 kconfiglib --> python

Next steps

Here are some next steps for exploring TF-M:

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