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+Qualcomm Snapdragon 410 (MSM8916/APQ8016)
+=========================================
+
+The `Qualcomm Snapdragon 410`_ is Qualcomm's first 64-bit SoC, released in 2014
+with four ARM Cortex-A53 cores. There are differents variants (MSM8916,
+APQ8016(E), ...) that are all very similar. A popular device based on APQ8016E
+is the `DragonBoard 410c`_ single-board computer, but the SoC is also used in
+various mid-range smartphones/tablets.
+
+The TF-A/BL31 port for MSM8916 provides a minimal, community-maintained
+EL3 firmware. It is primarily based on information from the public
+`Snapdragon 410E Technical Reference Manual`_ combined with a lot of
+trial and error to actually make it work.
+
+.. note::
+	Unlike the :doc:`QTI SC7180/SC7280 <qti>` ports, this port does **not**
+	make use of a proprietary binary components (QTISECLIB). It is fully
+	open-source but therefore limited to publicly documented hardware
+	components.
+
+Functionality
+-------------
+
+The BL31 port is much more minimal compared to the original firmware and
+therefore expects the non-secure world (e.g. Linux) to manage more hardware,
+such as the SMMUs and all remote processors (RPM, WCNSS, Venus, Modem).
+Everything except modem is currently functional with a slightly modified version
+of mainline Linux.
+
+.. warning::
+	This port is **not secure**. There is no special secure memory and the
+	used DRAM is available from both the non-secure and secure worlds.
+	Unfortunately, the hardware used for memory protection is not described
+	in the APQ8016E documentation.
+
+The port is primarily intended as a minimal PSCI implementation (without a
+separate secure world) where this limitation is not a big problem. Booting
+secondary CPU cores (PSCI ``CPU_ON``) is supported. Basic CPU core power
+management (``CPU_SUSPEND``) is functional but still work-in-progress and
+will be added later once ready.
+
+Boot Flow
+---------
+BL31 replaces the original ``tz`` firmware in the boot flow::
+
+	Boot ROM (PBL) -> SBL -> BL31 (EL3) -> U-Boot (EL2) -> Linux (EL2)
+
+By default, BL31 enters the non-secure world in EL2 AArch64 state at address
+``0x8f600000``. The original hypervisor firmware (``hyp``) is not used, you can
+use KVM or another hypervisor. The entry address is fixed in the BL31 binary
+but can be changed using the ``PRELOADED_BL33_BASE`` make file parameter.
+
+Using an AArch64 bootloader (such as `U-Boot for DragonBoard 410c`_) is
+recommended. AArch32 bootloaders (such as the original Little Kernel bootloader
+from Qualcomm) are not directly supported, although it is possible to use an EL2
+shim loader to temporarily switch to AArch32 state.
+
+Installation
+------------
+First, setup the cross compiler for AArch64 and build TF-A for ``msm8916``::
+
+	$ make CROSS_COMPILE=aarch64-linux-gnu- PLAT=msm8916
+
+The BL31 ELF image is generated in ``build/msm8916/release/bl31/bl31.elf``.
+This image must be "signed" before flashing it, even if the board has secure
+boot disabled. In this case the signature does not provide any security,
+but it provides the firmware with required metadata.
+
+The `DragonBoard 410c`_ does not have secure boot enabled by default. In this
+case you can simply sign the ELF image using a randomly generated key. You can
+use e.g. `qtestsign`_::
+
+	$ ./qtestsign.py tz build/msm8916/release/bl31/bl31.elf
+
+Then install the resulting ``build/msm8916/release/bl31/bl31-test-signed.mbn``
+to the ``tz`` partition on the device. BL31 should be running after a reboot.
+
+.. warning::
+	Do not flash incorrectly signed firmware on devices that have secure
+	boot enabled! Make sure that you have a way to recover the board in case
+	of problems (e.g. using EDL).
+
+Boot Trace
+----------
+BL31 prints some lines on the debug console UART2, which will usually look like
+this (with ``DEBUG=1``, otherwise only the ``NOTICE`` lines are shown)::
+
+	...
+	S - DDR Frequency, 400 MHz
+	NOTICE:  BL31: v2.6(debug):v2.6
+	NOTICE:  BL31: Built : 20:00:00, Dec 01 2021
+	INFO:    BL31: Platform setup start
+	INFO:    ARM GICv2 driver initialized
+	INFO:    BL31: Platform setup done
+	INFO:    BL31: Initializing runtime services
+	INFO:    BL31: cortex_a53: CPU workaround for 819472 was applied
+	INFO:    BL31: cortex_a53: CPU workaround for 824069 was applied
+	INFO:    BL31: cortex_a53: CPU workaround for 826319 was applied
+	INFO:    BL31: cortex_a53: CPU workaround for 827319 was applied
+	INFO:    BL31: cortex_a53: CPU workaround for 835769 was applied
+	INFO:    BL31: cortex_a53: CPU workaround for disable_non_temporal_hint was applied
+	INFO:    BL31: cortex_a53: CPU workaround for 843419 was applied
+	INFO:    BL31: cortex_a53: CPU workaround for 1530924 was applied
+	INFO:    BL31: Preparing for EL3 exit to normal world
+	INFO:    Entry point address = 0x8f600000
+	INFO:    SPSR = 0x3c9
+
+	U-Boot 2021.10 (Dec 01 2021 - 20:00:00 +0000)
+	Qualcomm-DragonBoard 410C
+	...
+
+.. _Qualcomm Snapdragon 410: https://www.qualcomm.com/products/snapdragon-processors-410
+.. _DragonBoard 410c: https://www.96boards.org/product/dragonboard410c/
+.. _Snapdragon 410E Technical Reference Manual: https://developer.qualcomm.com/download/sd410/snapdragon-410e-technical-reference-manual.pdf
+.. _U-Boot for DragonBoard 410c: https://u-boot.readthedocs.io/en/latest/board/qualcomm/dragonboard410c.html
+.. _qtestsign: https://github.com/msm8916-mainline/qtestsign