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+.. _Header_configuration:
+
+#############################
+The Header File Config System
+#############################
+
+The header file configurations system is used to fine-tune component options.
+
+The following diagram shows how the system works.
+
+.. figure:: header_file_system.png
+
+A ``config_tfm.h`` file collects customized configurations, including platform customized and
+project specific settings.
+Each component has a ``config_<comp_name>.h`` which includes the ``config_tfm.h`` first and then
+provides default values for each config option of the component as well as necessary validations
+on config dependencies.
+Source files then include component header files when necessary.
+
+The ``config_tfm.h`` includes a customized project config file provided via compile definition
+``PROJECT_CONFIG_HEADER_FILE``.
+Users set the corresponding CMake variable ``PROJECT_CONFIG_HEADER_FILE`` with the full path of the
+configuration header file.
+A platform can adjust or place restriction on config options by providing a ``config_tfm_target.h``
+under the root folder of their platforms.
+If the build system finds the file, it sets the ``TARGET_CONFIG_HEADER_FILE`` compile definition.
+
+.. code-block:: c
+
+    #ifdef PROJECT_CONFIG_HEADER_FILE
+    #include PROJECT_CONFIG_HEADER_FILE
+    #endif
+
+    #ifdef TARGET_CONFIG_HEADER_FILE
+    #include TARGET_CONFIG_HEADER_FILE
+    #endif
+
+The project config header file can be
+
+- Generated by the TF-M Kconfig system <kconfig_system>
+- One of the header files of Profiles <tf-m_profiles>, set via the ``TFM_PROFILE`` build option.
+- Manually customized profile based on pre-set profiles.
+
+It is expected that all Component options are included in the header file to explicitly set values
+for each option.
+Refer to `Base Config Options`_ for details the base configurations.
+
+*******************
+Base Config Options
+*******************
+This section lists the config option categorizations of the SPM and Secure Partitions.
+
+Crypto
+======
++-------------------------------------+-----------+------------+
+| Options                             | Type      | Base Value |
++=====================================+===========+============+
+|TFM_PARTITION_CRYPTO                 | Build     |   OFF      |
++-------------------------------------+-----------+------------+
+|CRYPTO_TFM_BUILTIN_KEYS_DRIVER       | Build     |   ON       |
++-------------------------------------+-----------+------------+
+|CRYPTO_NV_SEED                       | Component |   ON       |
++-------------------------------------+-----------+------------+
+|CRYPTO_ENGINE_BUF_SIZE               | Component |   0x2080   |
++-------------------------------------+-----------+------------+
+|CRYPTO_IOVEC_BUFFER_SIZE             | Component |   5120     |
++-------------------------------------+-----------+------------+
+|CRYPTO_STACK_SIZE                    | Component |   0x1B00   |
++-------------------------------------+-----------+------------+
+|CRYPTO_CONC_OPER_NUM                 | Component |   8        |
++-------------------------------------+-----------+------------+
+|CRYPTO_RNG_MODULE_ENABLED            | Component |   1        |
++-------------------------------------+-----------+------------+
+|CRYPTO_KEY_MODULE_ENABLED            | Component |   1        |
++-------------------------------------+-----------+------------+
+|CRYPTO_AEAD_MODULE_ENABLED           | Component |   1        |
++-------------------------------------+-----------+------------+
+|CRYPTO_MAC_MODULE_ENABLED            | Component |   1        |
++-------------------------------------+-----------+------------+
+|CRYPTO_HASH_MODULE_ENABLED           | Component |   1        |
++-------------------------------------+-----------+------------+
+|CRYPTO_CIPHER_MODULE_ENABLED         | Component |   1        |
++-------------------------------------+-----------+------------+
+|CRYPTO_ASYM_SIGN_MODULE_ENABLED      | Component |   1        |
++-------------------------------------+-----------+------------+
+|CRYPTO_ASYM_ENCRYPT_MODULE_ENABLED   | Component |   1        |
++-------------------------------------+-----------+------------+
+|CRYPTO_KEY_DERIVATION_MODULE_ENABLED | Component |   1        |
++-------------------------------------+-----------+------------+
+|CRYPTO_SINGLE_PART_FUNCS_ENABLED     | Component |   1        |
++-------------------------------------+-----------+------------+
+
+Initial Attestation
+===================
++-------------------------------------+-----------+-------------+
+| Options                             | Type      | Base Value  |
++=====================================+===========+=============+
+|TFM_PARTITION_INITIAL_ATTESTATION    | Build     |   OFF       |
++-------------------------------------+-----------+-------------+
+|SYMMETRIC_INITIAL_ATTESTATION        | Build     |   OFF       |
++-------------------------------------+-----------+-------------+
+|ATTEST_INCLUDE_TEST_CODE             | Build     |   OFF       |
++-------------------------------------+-----------+-------------+
+|ATTEST_KEY_BITS                      | Build     |   256       |
++-------------------------------------+-----------+-------------+
+|ATTEST_TOKEN_PROFILE                 | Component | "PSA_IOT_1" |
++-------------------------------------+-----------+-------------+
+|ATTEST_INCLUDE_OPTIONAL_CLAIMS       | Component |   1         |
++-------------------------------------+-----------+-------------+
+|ATTEST_INCLUDE_COSE_KEY_ID           | Component |   0         |
++-------------------------------------+-----------+-------------+
+|ATTEST_STACK_SIZE                    | Component |   0x700     |
++-------------------------------------+-----------+-------------+
+
+Internal Trusted Storage
+========================
++---------------------------------------+-----------+------------------------+
+| Options                               | Type      | Base Value             |
++=======================================+===========+========================+
+|TFM_PARTITION_INTERNAL_TRUSTED_STORAGE | Build     |   OFF                  |
++---------------------------------------+-----------+------------------------+
+|ITS_CREATE_FLASH_LAYOUT                | Component |   1                    |
++---------------------------------------+-----------+------------------------+
+|ITS_RAM_FS                             | Component |   0                    |
++---------------------------------------+-----------+------------------------+
+|ITS_VALIDATE_METADATA_FROM_FLASH       | Component |   1                    |
++---------------------------------------+-----------+------------------------+
+|ITS_MAX_ASSET_SIZE                     | Component |   512                  |
++---------------------------------------+-----------+------------------------+
+|ITS_NUM_ASSETS                         | Component |   10                   |
++---------------------------------------+-----------+------------------------+
+|ITS_BUF_SIZE                           | Component |   ITS_MAX_ASSET_SIZE   |
++---------------------------------------+-----------+------------------------+
+|ITS_STACK_SIZE                         | Component |   0x720                |
++---------------------------------------+-----------+------------------------+
+
+Protected Storage
+=================
++---------------------------------------+-----------+-----------------+
+| Options                               | Type      | Base Value      |
++=======================================+===========+=================+
+|TFM_PARTITION_PROTECTED_STORAGE        | Build     |   OFF           |
++---------------------------------------+-----------+-----------------+
+|PS_ENCRYPTION                          | Build     |   ON            |
++---------------------------------------+-----------+-----------------+
+|PS_CRYPTO_AEAD_ALG                     | Build     |   PSA_ALG_GCM   |
++---------------------------------------+-----------+-----------------+
+|PS_CREATE_FLASH_LAYOUT                 | Component |   1             |
++---------------------------------------+-----------+-----------------+
+|PS_RAM_FS                              | Component |   0             |
++---------------------------------------+-----------+-----------------+
+|PS_VALIDATE_METADATA_FROM_FLASH        | Component |   1             |
++---------------------------------------+-----------+-----------------+
+|PS_MAX_ASSET_SIZE                      | Component |   2048          |
++---------------------------------------+-----------+-----------------+
+|PS_NUM_ASSETS                          | Component |   10            |
++---------------------------------------+-----------+-----------------+
+|PS_ROLLBACK_PROTECTION                 | Component |   1             |
++---------------------------------------+-----------+-----------------+
+|PS_STACK_SIZE                          | Component |   0x700         |
++---------------------------------------+-----------+-----------------+
+
+Firmware Update
+===============
++-------------------------------------+-----------+-------------------------------------+
+| Options                             | Type      | Base Value                          |
++=====================================+===========+=====================================+
+|PLATFORM_HAS_FIRMWARE_UPDATE_SUPPORT | Build     |   OFF                               |
++-------------------------------------+-----------+-------------------------------------+
+|TFM_PARTITION_FIRMWARE_UPDATE        | Build     |   OFF                               |
++-------------------------------------+-----------+-------------------------------------+
+|TFM_CONFIG_FWU_MAX_WRITE_SIZE        | Build     |   1024                              |
++-------------------------------------+-----------+-------------------------------------+
+|TFM_CONFIG_FWU_MAX_MANIFEST_SIZE     | Build     |   0                                 |
++-------------------------------------+-----------+-------------------------------------+
+|FWU_DEVICE_CONFIG_FILE               | Build     |   ""                                |
++-------------------------------------+-----------+-------------------------------------+
+|FWU_SUPPORT_TRIAL_STATE              | Build     | Depends on MCUBOOT_UPGRADE_STRATEGY |
++-------------------------------------+-----------+-------------------------------------+
+|TFM_FWU_BOOTLOADER_LIB               | Build     |   "mcuboot"                         |
++-------------------------------------+-----------+-------------------------------------+
+|TFM_FWU_BUF_SIZE                     | Component |   PSA_FWU_MAX_BLOCK_SIZE            |
++-------------------------------------+-----------+-------------------------------------+
+|FWU_STACK_SIZE                       | Component |   0x600                             |
++-------------------------------------+-----------+-------------------------------------+
+
+Platform Secure Partition
+=========================
++-------------------------------------+-----------+------------+
+| Options                             | Type      | Base Value |
++=====================================+===========+============+
+|TFM_PARTITION_PLATFORM               | Build     |   OFF      |
++-------------------------------------+-----------+------------+
+|PLATFORM_SERVICE_INPUT_BUFFER_SIZE   | Component |   64       |
++-------------------------------------+-----------+------------+
+|PLATFORM_SERVICE_OUTPUT_BUFFER_SIZE  | Component |   64       |
++-------------------------------------+-----------+------------+
+|PLATFORM_SP_STACK_SIZE               | Component |   0x500    |
++-------------------------------------+-----------+------------+
+|PLATFORM_NV_COUNTER_MODULE_DISABLED  | Component |   0        |
++-------------------------------------+-----------+------------+
+
+Secure Partition Manager
+========================
++-------------------------------------+-----------+-------------+
+| Options                             | Type      | Base Values |
++=====================================+===========+=============+
+|TFM_ISOLATION_LEVEL                  | Build     |   1         |
++-------------------------------------+-----------+-------------+
+|PSA_FRAMEWORK_HAS_MM_IOVEC           | Build     |   OFF       |
++-------------------------------------+-----------+-------------+
+|CONFIG_TFM_SPM_BACKEND               | Build     |   "SFN"     |
++-------------------------------------+-----------+-------------+
+|TFM_SPM_LOG_LEVEL                    | Build     |   1         |
++-------------------------------------+-----------+-------------+
+|CONFIG_TFM_CONN_HANDLE_MAX_NUM       | Component |   8         |
++-------------------------------------+-----------+-------------+
+|CONFIG_TFM_DOORBELL_API              | Component |   0         |
++-------------------------------------+-----------+-------------+
+
+--------------
+
+*Copyright (c) 2022, Arm Limited. All rights reserved.*