hikey: add hikey support

Add the description on hikey and how to build.
Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>

docs/plat/hikey.md

+
+Description
+====================
+  HiKey is one of 96boards. Hisilicon Kirin6220 processor is installed on HiKey.
+
+  More information are listed in [link](https://github.com/96boards/documentation/blob/master/ConsumerEdition/HiKey/Quickstart/README.md).
+
+
+How to build
+====================
+
+1. Code Locations
+-----------------
+
+   * ARM Trusted Firmware:
+   [link](https://github.com/ARM-software/arm-trusted-firmware)
+
+   * edk2:
+   [link](https://github.com/96boards-hikey/edk2/tree/testing/hikey960_v2.5)
+
+   * OpenPlatformPkg:
+   [link](https://github.com/96boards-hikey/OpenPlatformPkg/tree/testing/hikey960_v1.3.4)
+
+   * l-loader:
+   [link](https://github.com/96boards-hikey/l-loader/tree/testing/hikey960_v1.2)
+
+   * uefi-tools:
+   [link](https://github.com/96boards-hikey/uefi-tools/tree/testing/hikey960_v1)
+
+   * atf-fastboot:
+   [link](https://github.com/96boards-hikey/atf-fastboot/tree/master)
+
+
+2. Build Procedure
+------------------
+
+   * Fetch all the above repositories into local host.
+     Make all the repositories in the same ${BUILD_PATH}.
+
+   * Create the symbol link to OpenPlatformPkg in edk2.
+     <br>`$cd ${BUILD_PATH}/edk2`</br>
+     <br>`$ln -sf ../OpenPlatformPkg`</br>
+
+   * Prepare AARCH64 && AARCH32 toolchain. Prepare python.
+
+   * If your hikey hardware is built by CircuitCo, update _uefi-tools/platform.config_ first. _(optional)_
+     <br>__Uncomment the below sentence. Otherwise, UEFI can't output messages on serial
+     console on hikey.__</br>
+     <br>`BUILDFLAGS=-DSERIAL_BASE=0xF8015000`</br>
+     <br>If your hikey hardware is built by LeMarker, nothing to do.</br>
+
+   * Build it as debug mode. Create your own build script file or you could refer to __build_uefi.sh__ in l-loader git repository.
+     <br>`BUILD_OPTION=DEBUG`</br>
+     <br>`export AARCH64_TOOLCHAIN=GCC5`</br>
+     <br>`export UEFI_TOOLS_DIR=${BUILD_PATH}/uefi-tools`<br>
+     <br>`export EDK2_DIR=${BUILD_PATH}/edk2`</br>
+     <br>`EDK2_OUTPUT_DIR=${EDK2_DIR}/Build/HiKey/${BUILD_OPTION}_${AARCH64_TOOLCHAIN}`</br>
+     <br>`# Build fastboot for ARM Trust Firmware. It's used for recovery mode.`</br>
+     <br>`cd ${BUILD_PATH}/atf-fastboot`</br>
+     <br>`CROSS_COMPILE=aarch64-linux-gnu- make PLAT=hikey DEBUG=1`</br>
+     <br>`# Convert DEBUG/RELEASE to debug/release`</br>
+     <br>`FASTBOOT_BUILD_OPTION=$(echo ${BUILD_OPTION} | tr '[A-Z]' '[a-z]')`</br>
+     <br>`cd ${EDK2_DIR}`</br>
+     <br>`# Build UEFI & ARM Trust Firmware`</br>
+     <br>`${UEFI_TOOLS_DIR}/uefi-build.sh -b ${BUILD_OPTION} -a ../arm-trusted-firmware hikey`</br>
+     <br>`# Generate l-loader.bin`</br>
+     <br>`cd ${BUILD_PATH}/l-loader`</br>
+     <br>`ln -sf ${EDK2_OUTPUT_DIR}/FV/bl1.bin`</br>
+     <br>`ln -sf ${EDK2_OUTPUT_DIR}/FV/fip.bin`</br>
+     <br>`ln -sf ${BUILD_PATH}/atf-fastboot/build/hikey/${FASTBOOT_BUILD_OPTION}/bl1.bin fastboot.bin`</br>
+     <br>`python gen_loader.py -o l-loader.bin --img_bl1=bl1.bin --img_ns_bl1u=BL33_AP_UEFI.fd`</br>
+     <br>`arm-linux-gnueabihf-gcc -c -o start.o start.S`</br>
+     <br>`arm-linux-gnueabihf-ld -Bstatic -Tl-loader.lds -Ttext 0xf9800800 start.o -o loader`</br>
+     <br>`arm-linux-gnueabihf-objcopy -O binary loader temp`</br>
+     <br>`python gen_loader_hikey.py -o l-loader.bin --img_loader=temp --img_bl1=bl1.bin --img_ns_bl1u=fastboot.bin`</br>
+
+   * Generate partition table for aosp. The eMMC capacity is either 4GB or 8GB. Just change "aosp-4g" to "linux-4g" for debian.
+     <br>`$PTABLE=aosp-4g SECTOR_SIZE=512 bash -x generate_ptable.sh`</br>
+
+
+3. Setup Console
+----------------
+
+   * Install ser2net. Use telnet as the console since UEFI fails to display Boot Manager GUI in minicom. __If you don't need Boot Manager GUI, just ignore this section.__
+     <br>`$sudo apt-get install ser2net`</br>
+
+   * Configure ser2net.
+     <br>`$sudo vi /etc/ser2net.conf`</br>
+     <br>Append one line for serial-over-USB in below.</br>
+     <br>_#ser2net.conf_</br>
+     <br>`2004:telnet:0:/dev/ttyUSB0:115200 8DATABITS NONE 1STOPBIT banner`</br>
+
+   * Open the console.
+     <br>`$telnet localhost 2004`</br>
+     <br>And you could open the console remotely, too.</br>
+
+
+4. Flush images in recovery mode
+-----------------------------
+
+   * Make sure Pin3-Pin4 on J15 are connected for recovery mode. Then power on HiKey.
+
+   * Remove the modemmanager package. This package may cause the idt tool failure.
+     <br>`$sudo apt-get purge modemmanager`</br>
+
+   * Run the command to download l-loader.bin into HiKey.
+     <br>`$sudo python hisi-idt.py -d /dev/ttyUSB1 --img1 l-loader.bin`</br>
+
+   * Update images. All aosp or debian images could be fetched from [link](https://builds.96boards.org/).
+     <br>`$sudo fastboot flash ptable prm_ptable.img`</br>
+     <br>`$sudo fastboot flash fastboot fip.bin`</br>
+     <br>`$sudo fastboot flash boot boot.img`</br>
+     <br>`$sudo fastboot flash cache cache.img`</br>
+     <br>`$sudo fastboot flash system system.img`</br>
+     <br>`$sudo fastboot flash userdata userdata.img`</br>
+
+
+5. Boot UEFI in normal mode
+-----------------------------
+
+   * Make sure Pin3-Pin4 on J15 are open for normal boot mode. Then power on HiKey.
+
+   * Reference [link](https://github.com/96boards-hikey/tools-images-hikey960/blob/master/build-from-source/README-ATF-UEFI-build-from-source.md)