Docs: Move design documents into a dedicated folder

Collect all the design documents under a dedicated design_docs folder.
Update the links in other documents.

Change-Id: I2da761a11317144185e960c539f2245d3d46fd2a
Signed-off-by: David Hu <david.hu@arm.com>
diff --git a/docs/contributing/code_review_guide.rst b/docs/contributing/code_review_guide.rst
index e9ed969..08d72a2 100644
--- a/docs/contributing/code_review_guide.rst
+++ b/docs/contributing/code_review_guide.rst
@@ -15,7 +15,7 @@
 
 - Read the :doc:`Contributing Process </docs/contributing/contributing_process>`
   to know basic concepts.
-- Read the :doc:`Source Structure </docs/technical_references/source_structure>`
+- Read the :doc:`Source Structure </docs/technical_references/design_docs/source_structure>`
   for structure related reference.
 
 The review guidelines consist of these items:
diff --git a/docs/integration_guide/os_migration_guide_armv8m.rst b/docs/integration_guide/os_migration_guide_armv8m.rst
index 1ca4e3d..a3b5806 100644
--- a/docs/integration_guide/os_migration_guide_armv8m.rst
+++ b/docs/integration_guide/os_migration_guide_armv8m.rst
@@ -24,7 +24,7 @@
   then it also have to use the
   ``enum tfm_status_e tfm_register_client_id (int32_t ns_client_id)``
   API function provided by TF-M, as described in
-  :doc:`NS client identification documentation </docs/technical_references/tfm_ns_client_identification>`.
+  :doc:`NS client identification documentation </docs/technical_references/design_docs/tfm_ns_client_identification>`.
 - if the OS doesn't support the API mentioned above, it should set
   ``TFM_NS_CLIENT_IDENTIFICATION`` to ``OFF`` in the cmake system.
 - .. Note::
diff --git a/docs/integration_guide/services/tfm_ps_integration_guide.rst b/docs/integration_guide/services/tfm_ps_integration_guide.rst
index 2c6da7b..50c83a4 100644
--- a/docs/integration_guide/services/tfm_ps_integration_guide.rst
+++ b/docs/integration_guide/services/tfm_ps_integration_guide.rst
@@ -293,7 +293,7 @@
 processing environment. It provides a dedicated API to retrieve the client ID
 which performs the service request.
 
-:doc:`NS client identification documentation </docs/technical_references/tfm_ns_client_identification>`
+:doc:`NS client identification documentation </docs/technical_references/design_docs/tfm_ns_client_identification>`
 provides further details on how client identification works.
 
 PS service uses that TF-M core API to retrieve the client ID and associate it
diff --git a/docs/integration_guide/services/tfm_psa_proxy_integration_guide.rst b/docs/integration_guide/services/tfm_psa_proxy_integration_guide.rst
index 9b8ed3d..4fb467f 100644
--- a/docs/integration_guide/services/tfm_psa_proxy_integration_guide.rst
+++ b/docs/integration_guide/services/tfm_psa_proxy_integration_guide.rst
@@ -9,7 +9,7 @@
 to a Secure Enclave, this way virtually providing all the PSA RoT services.
 Proxy can only be used in IPC model, for context and design details please
 check the
-:doc:`Secure Enclave design document </docs/technical_references/secure_enclave_solution>`.
+:doc:`Secure Enclave design document </docs/technical_references/design_docs/secure_enclave_solution>`.
 
 Currently to forward the PSA Client call parameters Proxy must read them with
 ``psa_read`` into a memory area shared with the Secure Enclave. (Similarily
diff --git a/docs/integration_guide/tfm_integration_guide.rst b/docs/integration_guide/tfm_integration_guide.rst
index a543fd0..f0f2a1e 100644
--- a/docs/integration_guide/tfm_integration_guide.rst
+++ b/docs/integration_guide/tfm_integration_guide.rst
@@ -112,7 +112,7 @@
 
 TF-M provides a reference implementation of NS mailbox on multi-core platforms,
 under folder ``interface/src/multi_core``.
-See :doc:`Mailbox design </docs/technical_references/dual-cpu/mailbox_design_on_dual_core_system>`
+See :doc:`Mailbox design </docs/technical_references/design_docs/dual-cpu/mailbox_design_on_dual_core_system>`
 for TF-M multi-core mailbox design.
 
 Interface with non-secure world regression tests
@@ -135,7 +135,7 @@
 NS client Identification
 ========================
 See
-:doc:`ns client identification documentation </docs/technical_references/tfm_ns_client_identification>`.
+:doc:`ns client identification documentation </docs/technical_references/design_docs/tfm_ns_client_identification>`.
 
 *********************
 Non-secure interrupts
diff --git a/docs/releases/1.3.0.rst b/docs/releases/1.3.0.rst
index 9e281cb..0f4984f 100644
--- a/docs/releases/1.3.0.rst
+++ b/docs/releases/1.3.0.rst
@@ -160,11 +160,11 @@
 
   .. [3] :doc:`TF-M generic threat model </docs/security/threat_models/generic_threat_model>`
 
-  .. [4] :doc:`TF-M physical attack mitigation </docs/technical_references/tfm_physical_attack_mitigation>`
+  .. [4] :doc:`TF-M physical attack mitigation </docs/technical_references/design_docs/tfm_physical_attack_mitigation>`
 
-  .. [5] :doc:`TF-M Profile Large design </docs/technical_references/profiles/tfm_profile_large>`
+  .. [5] :doc:`TF-M Profile Large design </docs/technical_references/design_docs/profiles/tfm_profile_large>`
 
-  .. [6] :doc:`Code sharing between independently linked XIP binaries </docs/technical_references/code_sharing>`
+  .. [6] :doc:`Code sharing between independently linked XIP binaries </docs/technical_references/design_docs/code_sharing>`
 
   .. [7] :doc:`Security Handling </docs/security/security>`
 
diff --git a/docs/security/threat_models/generic_threat_model.rst b/docs/security/threat_models/generic_threat_model.rst
index 6356951..94f510b 100644
--- a/docs/security/threat_models/generic_threat_model.rst
+++ b/docs/security/threat_models/generic_threat_model.rst
@@ -1107,7 +1107,7 @@
 
 .. [FF-M] `Arm® Platform Security Architecture Firmware Framework 1.0 <https://developer.arm.com/-/media/Files/pdf/PlatformSecurityArchitecture/Architect/DEN0063-PSA_Firmware_Framework-1.0.0-2.pdf?revision=2d1429fa-4b5b-461a-a60e-4ef3d8f7f4b4>`_
 
-.. [DUAL-CPU-BOOT] :doc:`Booting a dual core system </docs/technical_references/dual-cpu/booting_a_dual_core_system>`
+.. [DUAL-CPU-BOOT] :doc:`Booting a dual core system </docs/technical_references/design_docs/dual-cpu/booting_a_dual_core_system>`
 
 .. [CVSS] `Common Vulnerability Scoring System Version 3.1 Calculator <https://www.first.org/cvss/calculator/3.1>`_
 
@@ -1115,9 +1115,9 @@
 
 .. [STRIDE] `The STRIDE Threat Model <https://docs.microsoft.com/en-us/previous-versions/commerce-server/ee823878(v=cs.20)?redirectedfrom=MSDN>`_
 
-.. [SECURE-BOOT] :doc:`Secure boot </docs/technical_references/tfm_secure_boot>`
+.. [SECURE-BOOT] :doc:`Secure boot </docs/technical_references/design_docs/tfm_secure_boot>`
 
-.. [ROLLBACK-PROTECT] :doc:`Rollback protection in TF-M secure boot </docs/technical_references/secure_boot_rollback_protection>`
+.. [ROLLBACK-PROTECT] :doc:`Rollback protection in TF-M secure boot </docs/technical_references/design_docs/secure_boot_rollback_protection>`
 
 .. [STACK-SEAL] `Armv8-M processor Secure software Stack Sealing vulnerability <https://developer.arm.com/support/arm-security-updates/armv8-m-stack-sealing>`_
 
diff --git a/docs/technical_references/code_sharing.rst b/docs/technical_references/design_docs/code_sharing.rst
similarity index 100%
rename from docs/technical_references/code_sharing.rst
rename to docs/technical_references/design_docs/code_sharing.rst
diff --git a/docs/technical_references/dual-cpu/booting_a_dual_core_system.rst b/docs/technical_references/design_docs/dual-cpu/booting_a_dual_core_system.rst
similarity index 100%
rename from docs/technical_references/dual-cpu/booting_a_dual_core_system.rst
rename to docs/technical_references/design_docs/dual-cpu/booting_a_dual_core_system.rst
diff --git a/docs/technical_references/dual-cpu/communication_prototype_between_nspe_and_spe_in_dual_core_systems.rst b/docs/technical_references/design_docs/dual-cpu/communication_prototype_between_nspe_and_spe_in_dual_core_systems.rst
similarity index 100%
rename from docs/technical_references/dual-cpu/communication_prototype_between_nspe_and_spe_in_dual_core_systems.rst
rename to docs/technical_references/design_docs/dual-cpu/communication_prototype_between_nspe_and_spe_in_dual_core_systems.rst
diff --git a/docs/technical_references/dual-cpu/dual_core_mailbox_arch.png b/docs/technical_references/design_docs/dual-cpu/dual_core_mailbox_arch.png
similarity index 100%
rename from docs/technical_references/dual-cpu/dual_core_mailbox_arch.png
rename to docs/technical_references/design_docs/dual-cpu/dual_core_mailbox_arch.png
Binary files differ
diff --git a/docs/technical_references/dual-cpu/index.rst b/docs/technical_references/design_docs/dual-cpu/index.rst
similarity index 100%
rename from docs/technical_references/dual-cpu/index.rst
rename to docs/technical_references/design_docs/dual-cpu/index.rst
diff --git a/docs/technical_references/dual-cpu/mailbox_design_on_dual_core_system.rst b/docs/technical_references/design_docs/dual-cpu/mailbox_design_on_dual_core_system.rst
similarity index 100%
rename from docs/technical_references/dual-cpu/mailbox_design_on_dual_core_system.rst
rename to docs/technical_references/design_docs/dual-cpu/mailbox_design_on_dual_core_system.rst
diff --git a/docs/technical_references/dual-cpu/tfm_multi_core_access_check.rst b/docs/technical_references/design_docs/dual-cpu/tfm_multi_core_access_check.rst
similarity index 100%
rename from docs/technical_references/dual-cpu/tfm_multi_core_access_check.rst
rename to docs/technical_references/design_docs/dual-cpu/tfm_multi_core_access_check.rst
diff --git a/docs/technical_references/enum_implicit_casting.rst b/docs/technical_references/design_docs/enum_implicit_casting.rst
similarity index 100%
rename from docs/technical_references/enum_implicit_casting.rst
rename to docs/technical_references/design_docs/enum_implicit_casting.rst
diff --git a/docs/technical_references/ff_isolation.rst b/docs/technical_references/design_docs/ff_isolation.rst
similarity index 100%
rename from docs/technical_references/ff_isolation.rst
rename to docs/technical_references/design_docs/ff_isolation.rst
diff --git a/docs/technical_references/hardware_abstraction_layer.rst b/docs/technical_references/design_docs/hardware_abstraction_layer.rst
similarity index 99%
rename from docs/technical_references/hardware_abstraction_layer.rst
rename to docs/technical_references/design_docs/hardware_abstraction_layer.rst
index 645426f..b574a3d 100644
--- a/docs/technical_references/hardware_abstraction_layer.rst
+++ b/docs/technical_references/design_docs/hardware_abstraction_layer.rst
@@ -61,7 +61,7 @@
   - There is a non-secure :term:`HAL` that focuses on the mailbox operation API
     for Dual-core topology. For more information about it, please refer to
     :doc:`Mailbox Design in TF-M on Dual-core System
-    </docs/technical_references/dual-cpu/mailbox_design_on_dual_core_system>`.
+    </docs/technical_references/design_docs/dual-cpu/mailbox_design_on_dual_core_system>`.
   - The minimal set of :term:`TF-M` :term:`HAL` is sufficient for Secure
     Partitions by using customized peripheral interfaces. To provide easier
     portability for the Secure Partitions, a Secure Partition :term:`HAL` is
diff --git a/docs/technical_references/design_docs/index.rst b/docs/technical_references/design_docs/index.rst
new file mode 100644
index 0000000..3566e03
--- /dev/null
+++ b/docs/technical_references/design_docs/index.rst
@@ -0,0 +1,13 @@
+Design documents
+================
+
+.. toctree::
+    :maxdepth: 2
+    :glob:
+
+    */index
+    *
+
+--------------
+
+*Copyright (c) 2021, Arm Limited. All rights reserved.*
diff --git a/docs/technical_references/media/hal_structure.png b/docs/technical_references/design_docs/media/hal_structure.png
similarity index 100%
rename from docs/technical_references/media/hal_structure.png
rename to docs/technical_references/design_docs/media/hal_structure.png
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diff --git a/docs/technical_references/media/symmetric_initial_attest/attest_token_finish.png b/docs/technical_references/design_docs/media/symmetric_initial_attest/attest_token_finish.png
similarity index 100%
rename from docs/technical_references/media/symmetric_initial_attest/attest_token_finish.png
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similarity index 100%
rename from docs/technical_references/media/symmetric_initial_attest/ia_service_flow.png
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diff --git a/docs/technical_references/media/symmetric_initial_attest/iat_decode.png b/docs/technical_references/design_docs/media/symmetric_initial_attest/iat_decode.png
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diff --git a/docs/technical_references/media/symmetric_initial_attest/overall_diagram.png b/docs/technical_references/design_docs/media/symmetric_initial_attest/overall_diagram.png
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rename from docs/technical_references/media/symmetric_initial_attest/overall_diagram.png
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diff --git a/docs/technical_references/media/tfm_crypto_design.png b/docs/technical_references/design_docs/media/tfm_crypto_design.png
similarity index 100%
rename from docs/technical_references/media/tfm_crypto_design.png
rename to docs/technical_references/design_docs/media/tfm_crypto_design.png
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diff --git a/docs/technical_references/profiles/index.rst b/docs/technical_references/design_docs/profiles/index.rst
similarity index 100%
rename from docs/technical_references/profiles/index.rst
rename to docs/technical_references/design_docs/profiles/index.rst
diff --git a/docs/technical_references/profiles/tfm_profile_large.rst b/docs/technical_references/design_docs/profiles/tfm_profile_large.rst
similarity index 98%
rename from docs/technical_references/profiles/tfm_profile_large.rst
rename to docs/technical_references/design_docs/profiles/tfm_profile_large.rst
index 45e51f4..d59ae61 100644
--- a/docs/technical_references/profiles/tfm_profile_large.rst
+++ b/docs/technical_references/design_docs/profiles/tfm_profile_large.rst
@@ -436,9 +436,9 @@
 Reference
 *********
 
-.. [1] :doc:`Trusted Firmware-M Profile Small Design </docs/technical_references/profiles/tfm_profile_small>`
+.. [1] :doc:`Trusted Firmware-M Profile Small Design </docs/technical_references/design_docs/profiles/tfm_profile_small>`
 
-.. [2] :doc:`Trusted Firmware-M Profile Medium Design </docs/technical_references/profiles/tfm_profile_medium>`
+.. [2] :doc:`Trusted Firmware-M Profile Medium Design </docs/technical_references/design_docs/profiles/tfm_profile_medium>`
 
 .. [3] `PSA Certified Level 3 Lightweight Protection Profile <https://www.psacertified.org/app/uploads/2020/12/JSADEN009-PSA_Certified_Level_3_LW_PP-1.0-BET02.pdf>`_
 
@@ -446,9 +446,9 @@
 
 .. [5] `The Transport Layer Security (TLS) Protocol Version 1.2 <https://tools.ietf.org/html/rfc5246>`_
 
-.. [6] :doc:`Physical attack mitigation in Trusted Firmware-M </docs/technical_references/tfm_physical_attack_mitigation>`
+.. [6] :doc:`Physical attack mitigation in Trusted Firmware-M </docs/technical_references/design_docs/tfm_physical_attack_mitigation>`
 
-.. [7] :doc:`Crypto design </docs/technical_references/tfm_crypto_design>`
+.. [7] :doc:`Crypto design </docs/technical_references/design_docs/tfm_crypto_design>`
 
 .. [8] :doc:`ITS integration guide </docs/integration_guide/services/tfm_its_integration_guide>`
 
diff --git a/docs/technical_references/profiles/tfm_profile_medium.rst b/docs/technical_references/design_docs/profiles/tfm_profile_medium.rst
similarity index 99%
rename from docs/technical_references/profiles/tfm_profile_medium.rst
rename to docs/technical_references/design_docs/profiles/tfm_profile_medium.rst
index 6b384c7..5bc4d57 100644
--- a/docs/technical_references/profiles/tfm_profile_medium.rst
+++ b/docs/technical_references/design_docs/profiles/tfm_profile_medium.rst
@@ -470,7 +470,7 @@
 
 .. [RFC7925] `Transport Layer Security (TLS) / Datagram Transport Layer Security (DTLS) Profiles for the Internet of Things <https://tools.ietf.org/html/rfc7925>`_
 
-.. [PROFILE-S] :doc:`Trusted Firmware-M Profile Small Design </docs/technical_references/profiles/tfm_profile_small>`
+.. [PROFILE-S] :doc:`Trusted Firmware-M Profile Small Design </docs/technical_references/design_docs/profiles/tfm_profile_small>`
 
 .. [RFC7252] `The Constrained Application Protocol (CoAP) <https://tools.ietf.org/html/rfc7252>`_
 
@@ -478,7 +478,7 @@
 
 .. [RFC7251] `AES-CCM Elliptic Curve Cryptography (ECC) Cipher Suites for TLS <https://tools.ietf.org/html/rfc7251>`_
 
-.. [CRYPTO-DESIGN] :doc:`Crypto design </docs/technical_references/tfm_crypto_design>`
+.. [CRYPTO-DESIGN] :doc:`Crypto design </docs/technical_references/design_docs/tfm_crypto_design>`
 
 .. [ITS-INTEGRATE] :doc:`ITS integration guide </docs/integration_guide/services/tfm_its_integration_guide>`
 
diff --git a/docs/technical_references/profiles/tfm_profile_small.rst b/docs/technical_references/design_docs/profiles/tfm_profile_small.rst
similarity index 99%
rename from docs/technical_references/profiles/tfm_profile_small.rst
rename to docs/technical_references/design_docs/profiles/tfm_profile_small.rst
index 17f6f49..51d78f2 100644
--- a/docs/technical_references/profiles/tfm_profile_small.rst
+++ b/docs/technical_references/design_docs/profiles/tfm_profile_small.rst
@@ -636,9 +636,9 @@
 
 .. [8] `PSA Attestation API 1.0 (ARM IHI 0085) <https://developer.arm.com/-/media/Files/pdf/PlatformSecurityArchitecture/Implement/IHI0085-PSA_Attestation_API-1.0.2.pdf?revision=eef78753-c77e-4b24-bcf0-65596213b4c1&la=en&hash=E5E0353D612077AFDCE3F2F3708A50C77A74B2A3>`_
 
-.. [9] :doc:`Secure boot </docs/technical_references/tfm_secure_boot>`
+.. [9] :doc:`Secure boot </docs/technical_references/design_docs/tfm_secure_boot>`
 
-.. [10] :doc:`Crypto design </docs/technical_references/tfm_crypto_design>`
+.. [10] :doc:`Crypto design </docs/technical_references/design_docs/tfm_crypto_design>`
 
 .. [11] :doc:`TF-M build instruction </docs/technical_references/instructions/tfm_build_instruction>`
 
diff --git a/docs/technical_references/ps_key_management.rst b/docs/technical_references/design_docs/ps_key_management.rst
similarity index 100%
rename from docs/technical_references/ps_key_management.rst
rename to docs/technical_references/design_docs/ps_key_management.rst
diff --git a/docs/technical_references/secure_boot_hw_key_integration.rst b/docs/technical_references/design_docs/secure_boot_hw_key_integration.rst
similarity index 100%
rename from docs/technical_references/secure_boot_hw_key_integration.rst
rename to docs/technical_references/design_docs/secure_boot_hw_key_integration.rst
diff --git a/docs/technical_references/secure_boot_rollback_protection.rst b/docs/technical_references/design_docs/secure_boot_rollback_protection.rst
similarity index 100%
rename from docs/technical_references/secure_boot_rollback_protection.rst
rename to docs/technical_references/design_docs/secure_boot_rollback_protection.rst
diff --git a/docs/technical_references/secure_enclave_solution.rst b/docs/technical_references/design_docs/secure_enclave_solution.rst
similarity index 100%
rename from docs/technical_references/secure_enclave_solution.rst
rename to docs/technical_references/design_docs/secure_enclave_solution.rst
diff --git a/docs/technical_references/source_structure.rst b/docs/technical_references/design_docs/source_structure.rst
similarity index 100%
rename from docs/technical_references/source_structure.rst
rename to docs/technical_references/design_docs/source_structure.rst
diff --git a/docs/technical_references/stateless_rot_service.rst b/docs/technical_references/design_docs/stateless_rot_service.rst
similarity index 100%
rename from docs/technical_references/stateless_rot_service.rst
rename to docs/technical_references/design_docs/stateless_rot_service.rst
diff --git a/docs/technical_references/symmetric_initial_attest.rst b/docs/technical_references/design_docs/symmetric_initial_attest.rst
similarity index 99%
rename from docs/technical_references/symmetric_initial_attest.rst
rename to docs/technical_references/design_docs/symmetric_initial_attest.rst
index b53ab3c..c139d64 100644
--- a/docs/technical_references/symmetric_initial_attest.rst
+++ b/docs/technical_references/design_docs/symmetric_initial_attest.rst
@@ -588,7 +588,7 @@
 
 .. [1] `PSA Attestation API 1.0 (ARM IHI 0085) <https://developer.arm.com/-/media/Files/pdf/PlatformSecurityArchitecture/Implement/IHI0085-PSA_Attestation_API-1.0.2.pdf?revision=eef78753-c77e-4b24-bcf0-65596213b4c1&la=en&hash=E5E0353D612077AFDCE3F2F3708A50C77A74B2A3>`_
 
-.. [2] :doc:`Trusted Firmware-M Profile Small Design </docs/technical_references/profiles/tfm_profile_small>`
+.. [2] :doc:`Trusted Firmware-M Profile Small Design </docs/technical_references/design_docs/profiles/tfm_profile_small>`
 
 .. [3] :doc:`Initial Attestation Service Integration Guide </docs/integration_guide/services/tfm_attestation_integration_guide>`
 
diff --git a/docs/technical_references/tfm_code_generation_with_jinja2.rst b/docs/technical_references/design_docs/tfm_code_generation_with_jinja2.rst
similarity index 100%
rename from docs/technical_references/tfm_code_generation_with_jinja2.rst
rename to docs/technical_references/design_docs/tfm_code_generation_with_jinja2.rst
diff --git a/docs/technical_references/tfm_cooperative_scheduling_rules.rst b/docs/technical_references/design_docs/tfm_cooperative_scheduling_rules.rst
similarity index 100%
rename from docs/technical_references/tfm_cooperative_scheduling_rules.rst
rename to docs/technical_references/design_docs/tfm_cooperative_scheduling_rules.rst
diff --git a/docs/technical_references/tfm_crypto_design.rst b/docs/technical_references/design_docs/tfm_crypto_design.rst
similarity index 100%
rename from docs/technical_references/tfm_crypto_design.rst
rename to docs/technical_references/design_docs/tfm_crypto_design.rst
diff --git a/docs/technical_references/tfm_fwu_service.rst b/docs/technical_references/design_docs/tfm_fwu_service.rst
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rename from docs/technical_references/tfm_fwu_service.rst
rename to docs/technical_references/design_docs/tfm_fwu_service.rst
diff --git a/docs/technical_references/tfm_its_512_flash.rst b/docs/technical_references/design_docs/tfm_its_512_flash.rst
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rename from docs/technical_references/tfm_its_service.rst
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diff --git a/docs/technical_references/tfm_log_system_design_document.rst b/docs/technical_references/design_docs/tfm_log_system_design_document.rst
similarity index 100%
rename from docs/technical_references/tfm_log_system_design_document.rst
rename to docs/technical_references/design_docs/tfm_log_system_design_document.rst
diff --git a/docs/technical_references/tfm_non_secure_client_management.rst b/docs/technical_references/design_docs/tfm_non_secure_client_management.rst
similarity index 100%
rename from docs/technical_references/tfm_non_secure_client_management.rst
rename to docs/technical_references/design_docs/tfm_non_secure_client_management.rst
diff --git a/docs/technical_references/tfm_ns_client_identification.rst b/docs/technical_references/design_docs/tfm_ns_client_identification.rst
similarity index 100%
rename from docs/technical_references/tfm_ns_client_identification.rst
rename to docs/technical_references/design_docs/tfm_ns_client_identification.rst
diff --git a/docs/technical_references/tfm_partition_and_service_design_document.rst b/docs/technical_references/design_docs/tfm_partition_and_service_design_document.rst
similarity index 100%
rename from docs/technical_references/tfm_partition_and_service_design_document.rst
rename to docs/technical_references/design_docs/tfm_partition_and_service_design_document.rst
diff --git a/docs/technical_references/tfm_physical_attack_mitigation.rst b/docs/technical_references/design_docs/tfm_physical_attack_mitigation.rst
similarity index 100%
rename from docs/technical_references/tfm_physical_attack_mitigation.rst
rename to docs/technical_references/design_docs/tfm_physical_attack_mitigation.rst
diff --git a/docs/technical_references/tfm_psa_inter_process_communication.rst b/docs/technical_references/design_docs/tfm_psa_inter_process_communication.rst
similarity index 100%
rename from docs/technical_references/tfm_psa_inter_process_communication.rst
rename to docs/technical_references/design_docs/tfm_psa_inter_process_communication.rst
diff --git a/docs/technical_references/tfm_secure_boot.rst b/docs/technical_references/design_docs/tfm_secure_boot.rst
similarity index 100%
rename from docs/technical_references/tfm_secure_boot.rst
rename to docs/technical_references/design_docs/tfm_secure_boot.rst
diff --git a/docs/technical_references/tfm_secure_irq_handling.rst b/docs/technical_references/design_docs/tfm_secure_irq_handling.rst
similarity index 100%
rename from docs/technical_references/tfm_secure_irq_handling.rst
rename to docs/technical_references/design_docs/tfm_secure_irq_handling.rst
diff --git a/docs/technical_references/tfm_secure_partition_interrupt_handling.rst b/docs/technical_references/design_docs/tfm_secure_partition_interrupt_handling.rst
similarity index 98%
rename from docs/technical_references/tfm_secure_partition_interrupt_handling.rst
rename to docs/technical_references/design_docs/tfm_secure_partition_interrupt_handling.rst
index 79dea0c..f58fb96 100644
--- a/docs/technical_references/tfm_secure_partition_interrupt_handling.rst
+++ b/docs/technical_references/design_docs/tfm_secure_partition_interrupt_handling.rst
@@ -40,7 +40,7 @@
     ]}
 
 See
-:doc:`secure IRQ handling </docs/technical_references/tfm_secure_irq_handling>`
+:doc:`secure IRQ handling </docs/technical_references/design_docs/tfm_secure_irq_handling>`
 for further information on IRQ source and signal.
 
 Partition ISR function
diff --git a/docs/technical_references/tfm_secure_partition_runtime_library.rst b/docs/technical_references/design_docs/tfm_secure_partition_runtime_library.rst
similarity index 100%
rename from docs/technical_references/tfm_secure_partition_runtime_library.rst
rename to docs/technical_references/design_docs/tfm_secure_partition_runtime_library.rst
diff --git a/docs/technical_references/tfm_uniform_secure_service_signature.rst b/docs/technical_references/design_docs/tfm_uniform_secure_service_signature.rst
similarity index 100%
rename from docs/technical_references/tfm_uniform_secure_service_signature.rst
rename to docs/technical_references/design_docs/tfm_uniform_secure_service_signature.rst
diff --git a/docs/technical_references/index.rst b/docs/technical_references/index.rst
index b98df23..eabc0e1 100644
--- a/docs/technical_references/index.rst
+++ b/docs/technical_references/index.rst
@@ -5,11 +5,9 @@
     :maxdepth: 2
     :titlesonly:
     :glob:
-    :numbered:
 
     */index
     /tools/index
-    *
 
 --------------
 
diff --git a/docs/technical_references/index.rst.in b/docs/technical_references/index.rst.in
deleted file mode 100644
index b5cf149..0000000
--- a/docs/technical_references/index.rst.in
+++ /dev/null
@@ -1,30 +0,0 @@
-Design Documents
-================
-
-.. toctree::
-    :maxdepth: 1
-    :caption: Accepted design documents
-    :glob:
-    :numbered:
-
-    @ACCEPTED_DD_LIST@
-
-.. toctree::
-    :maxdepth: 1
-    :caption: Draft design documents
-    :glob:
-    :numbered:
-
-    @DRAFT_DD_LIST@
-
-.. toctree::
-    :maxdepth: 1
-    :caption: Rejected design documents
-    :glob:
-    :numbered:
-
-    @REJECTED_DD_LIST@
-
---------------
-
-*Copyright (c) 2019, Arm Limited. All rights reserved.*
diff --git a/docs/technical_references/instructions/run_tfm_examples_on_arm_platforms.rst b/docs/technical_references/instructions/run_tfm_examples_on_arm_platforms.rst
index 965d3e9..256147f 100644
--- a/docs/technical_references/instructions/run_tfm_examples_on_arm_platforms.rst
+++ b/docs/technical_references/instructions/run_tfm_examples_on_arm_platforms.rst
@@ -4,7 +4,7 @@
 Instructions for how to run TF-M and example test application on Arm platforms.
 
 Follow :doc:`build instruction <tfm_build_instruction>` to build the binaries.
-Follow :doc:`secure boot </docs/technical_references/tfm_secure_boot>` to build the
+Follow :doc:`secure boot </docs/technical_references/design_docs/tfm_secure_boot>` to build the
 binaries with or without BL2 bootloader.
 
 ****************************************************************
@@ -562,7 +562,7 @@
 Firmware upgrade and image validation with BL2 bootloader
 =========================================================
 High level operation of BL2 bootloader and instructions for testing firmware
-upgrade is described in :doc:`secure boot </docs/technical_references/tfm_secure_boot>`.
+upgrade is described in :doc:`secure boot </docs/technical_references/design_docs/tfm_secure_boot>`.
 
 --------------