Running Android on hikey board:

* Compiling userspace:
Pull AOSP source:
$ repo init -u https://android.googlesource.com/platform/manifest -b master & repo sync -j24

Download and extract HDMI binaries:
$ wget https://dl.google.com/dl/android/aosp/linaro-hikey-20170523-4b9ebaff.tgz
$ tar xzf linaro-hikey-20170523-4b9ebaff.tgz
$ ./extract-linaro-hikey.sh

Install mcopy utility:
$ apt-get install mtools

Build:
$ . ./build/envsetup.sh
$ lunch hikey-userdebug
$ make -j32

Note: For 4 GB eMMC part use:
$ make -j32 TARGET_USERDATAIMAGE_4GB=true

* Installing initial fastboot and ptable:
Select special bootloader mode by linking J15 1-2 and 3-4 pins
Connect USB to PC to get ttyUSB device (ex: ttyUSB1)
Power the board
$ cd device/linaro/hikey/installer/hikey
$ ./flash-all.sh /dev/ttyUSB1 [4g]
Remove link 3-4 and power the board

* Flashing images:
Enter fastboot mode by linking J15 1-2 and 5-6 pins
$ fastboot flash boot out/target/product/hikey/boot.img
$ fastboot flash system out/target/product/hikey/system.img
$ fastboot flash cache out/target/product/hikey/cache.img
$ fastboot flash userdata out/target/product/hikey/userdata.img
Remove jumper 5-6 and power the board

* Building kernel
$ git clone https://android.googlesource.com/kernel/hikey-linaro
$ cd hikey-linaro
$ git checkout -b android-hikey-linaro-4.9 origin/android-hikey-linaro-4.9
$ make ARCH=arm64 hikey_defconfig
$ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-android- -j24
Output: arch/arm64/boot/Image & arch/arm64/boot/dts/hisilicon/hi6220-hikey.dtb
   copy Image-dtb and hi6220-hikey.dtb to hikey-kernel directory to files
        Image-dtb-4.9 and hi6220-hikey.dtb-4.9

* Setting monitor resolution
Add to BOARD_KERNEL_CMDLINE in BoardConfig.mk or
if you are setting TARGET_BOOTIMAGE_USE_FAT=true edit
device/linaro/hikey/bootloader/EFI/BOOT/grub.cfg
Set video= (for example for 24” monitor): video=HDMI-A-1:1280x800@60

* Kernel serial output (uart3):
J2 (LS Expansion): 1 - Gnd, 11 - Rx, 13 - Tx

External links:
Board: https://www.96boards.org/products/ce/hikey/
Howto: https://github.com/96boards/documentation/wiki/LatestSnapshots
Schematics: https://www.96boards.org/wp-content/uploads/2015/02/96Boards-Hikey-Rev-A1.pdf