docs: Add hikey960.md

Signed-off-by: Victor Chong <victor.chong@linaro.org>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>

docs/hikey960.md

+# OP-TEE on HiKey960
+
+# Contents
+1. [Introduction](#1-introduction)
+2. [Supported HiKey960 boards?](#2-supported-hikey960-boards)
+3. [UART adapter board](#3-uart-adapter-board)
+4. [Regular build](#4-regular-build)
+5. [External guide](#5-external-guide)
+6. [Recovery](#6-recovery)
+
+# 1. Introduction
+The instructions here will tell how to run OP-TEE on HiKey960.
+
+# 2. Supported HiKey960 boards?
+There are two different versions of the HiKey960 board.
+
+| Name | Manufacturer | Memory | Flash | Comment |
+|------|--------------|--------|-------|---------|
+| HiKey960 | Archermind/LeMaker | 3GB | 32GB | v2 uses DIP Switches (SW2201) |
+| HiKey960 | Archermind/LeMaker | 3GB | 32GB | v1 uses Jumpers (J2001) |
+
+# 3. UART adapter board
+Everything is configured to use the [96Boards UART Adapter Board]. The UART is
+by default configured to UART6. If you have a v1 board and need to use UART5,
+then you need to change that before building. See `CFG_CONSOLE_UART` in
+[hikey960.mk].
+
+# 4. Regular build
+Just follow the "Get and build the solution" in the [README.md] file. If
+`make flash` doesn't work, try `make recovery`.
+
+# 5. External guide
+https://github.com/ARM-software/arm-trusted-firmware/blob/master/docs/plat/hikey960.rst
+
+# 6. Recovery
+If you manage to corrupt the device, so that fastboot doesn't load automatically
+on boot, then you will need to run the recovery procedure. Basically what you
+will need to do is use another make target and change some jumpers. All that is
+described when you run the target:
+```bash
+$ make recovery
+```
+
+[README.md]: ../README.md
+[hikey960.mk]: https://github.com/OP-TEE/build/blob/master/hikey960.mk
+[96Boards UART Adapter Board]: http://www.96boards.org/product/uarts