diff --git a/docs/plat/arm/diphda/index.rst b/docs/plat/arm/diphda/index.rst
new file mode 100644
index 0000000..27afda4
--- /dev/null
+++ b/docs/plat/arm/diphda/index.rst
@@ -0,0 +1,61 @@
+Diphda Platform
+==========================
+
+Some of the features of the Diphda platform referenced in TF-A include:
+
+- Cortex-A35 application processor (64-bit mode)
+- Secure Enclave
+- GIC-400
+- Trusted Board Boot
+
+Boot Sequence
+-------------
+
+The board boot relies on CoT (chain of trust). The trusted-firmware-a
+BL2 is extracted from the FIP and verified by the Secure Enclave
+processor. BL2 verification relies on the signature area at the
+beginning of the BL2 image. This area is needed by the SecureEnclave
+bootloader.
+
+Then, the application processor is released from reset and starts by
+executing BL2.
+
+BL2 performs the actions described in the trusted-firmware-a TBB design
+document.
+
+Build Procedure (TF-A only)
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+-  Obtain AArch64 ELF bare-metal target `toolchain <https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-a/downloads>`_.
+   Set the CROSS_COMPILE environment variable to point to the toolchain folder.
+
+-  Build TF-A:
+
+   .. code:: shell
+
+      make LD=aarch64-none-elf-ld \
+      CC=aarch64-none-elf-gcc \
+      V=1 \
+      BUILD_BASE=<path to the build folder> \
+      PLAT=diphda \
+      SPD=spmd \
+      SPMD_SPM_AT_SEL2=0 \
+      DEBUG=1 \
+      MBEDTLS_DIR=mbedtls \
+      OPENSSL_DIR=<path to openssl usr folder> \
+      RUNTIME_SYSROOT=<path to the sysroot> \
+      ARCH=aarch64 \
+      TARGET_PLATFORM=<fpga or fvp> \
+      ENABLE_PIE=1 \
+      BL2_AT_EL3=1 \
+      CREATE_KEYS=1 \
+      GENERATE_COT=1 \
+      TRUSTED_BOARD_BOOT=1 \
+      COT=tbbr \
+      ARM_ROTPK_LOCATION=devel_rsa \
+      ROT_KEY=plat/arm/board/common/rotpk/arm_rotprivk_rsa.pem \
+      BL32=<path to optee binary> \
+      BL33=<path to u-boot binary> \
+      bl2
+
+*Copyright (c) 2021, Arm Limited. All rights reserved.*
diff --git a/docs/plat/arm/index.rst b/docs/plat/arm/index.rst
index f72992b..f50dab5 100644
--- a/docs/plat/arm/index.rst
+++ b/docs/plat/arm/index.rst
@@ -12,6 +12,7 @@
    arm_fpga/index
    arm-build-options
    morello/index
+   diphda/index
 
 This chapter holds documentation related to Arm's development platforms,
 including both software models (FVPs) and hardware development boards
@@ -19,4 +20,4 @@
 
 --------------
 
-*Copyright (c) 2019, Arm Limited. All rights reserved.*
+*Copyright (c) 2021, Arm Limited. All rights reserved.*