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+## Building from source
+
+The source code is available from:
+- [**l-loader**](https://github.com/96boards-hikey/l-loader)
+- [**ARM Trusted Firmware**](https://github.com/96boards-hikey/arm-trusted-firmware)
+- [**Tianocore EDK2 – UEFI**](https://github.com/96boards-hikey/edk2) and [**OpenPlatformPkg**](https://github.com/96boards-hikey/OpenPlatformPkg)
+
+Since GRUB2 is currently consumed directly from the Debian package, debian package rebuild instructions applies.
+
+### Build instructions
+
+Prerequisites:
+- GCC 5.3 cross-toolchain for Aarch64 available in your PATH
+   - You can download and use the Linaro GCC binary (Linaro GCC 5.3-2016.02), available at [http://releases.linaro.org/components/toolchain/binaries/5.3-2016.02/aarch64-linux-gnu/gcc-linaro-5.3-2016.02-x86_64_aarch64-linux-gnu.tar.xz](http://releases.linaro.org/components/toolchain/binaries/5.3-2016.02/aarch64-linux-gnu/gcc-linaro-5.3-2016.02-x86_64_aarch64-linux-gnu.tar.xz)
+- GCC 5.3 cross-toolchain for gnueabihf available in your PATH
+   - You can download and use the Linaro GCC binary (Linaro GCC 5.3-2016.02), available at [http://releases.linaro.org/components/toolchain/binaries/5.3-2016.02/arm-linux-gnueabihf/gcc-linaro-5.3-2016.02-x86_64_arm-linux-gnueabihf.tar.xz](http://releases.linaro.org/components/toolchain/binaries/5.3-2016.02/arm-linux-gnueabihf/gcc-linaro-5.3-2016.02-x86_64_arm-linux-gnueabihf.tar.xz)
+- GPT fdisk (gdisk package from your favorite distribution).
+
+#### Installing pre-built toolchain(s)
+
+```shell
+mkdir arm-tc arm64-tc
+tar --strip-components=1 -C ${PWD}/arm-tc -xf gcc-linaro-5.3-*arm-linux-gnueabihf.tar.xz
+tar --strip-components=1 -C ${PWD}/arm64-tc -xf gcc-linaro-5.3-*aarch64-linux-gnu.tar.xz
+export PATH="${PWD}/arm-tc/bin:${PWD}/arm64-tc/bin:$PATH"
+```
+
+#### Getting the source code
+
+```shell
+git clone -b hikey-aosp https://github.com/96boards-hikey/edk2.git
+git clone -b hikey-aosp https://github.com/96boards-hikey/OpenPlatformPkg.git
+git clone -b hikey https://github.com/96boards-hikey/arm-trusted-firmware.git
+git clone https://github.com/96boards-hikey/l-loader.git
+git clone git://git.linaro.org/uefi/uefi-tools.git
+```
+
+#### Building EDK2/UEFI for HiKey
+
+Building EDK2/UEFI is simple if built with the _uefi-tools.sh_ script, since it already incorporates the platform specific configs and binaries.
+
+To build EDK2/UEFI (use **-b** to select **RELEASE** or **DEBUG** build):
+
+```shell
+export AARCH64_TOOLCHAIN=GCC49
+export EDK2_DIR=${PWD}/edk2
+export ATF_DIR=${PWD}/arm-trusted-firmware
+export UEFI_TOOLS_DIR=${PWD}/uefi-tools
+cd ${EDK2_DIR}
+rmdir OpenPlatformPkg; ln -s ../OpenPlatformPkg
+${UEFI_TOOLS_DIR}/uefi-build.sh -b RELEASE -a ${ATF_DIR} hikey
+```
+
+And bl1.bin with l-loader (ptable files are also created as part of the l-loader Makefile):
+
+```shell
+cd ../l-loader
+ln -s ${EDK2_DIR}/Build/HiKey/RELEASE_GCC49/FV/bl1.bin
+ln -s ${EDK2_DIR}/Build/HiKey/RELEASE_GCC49/FV/fip.bin
+make # requires sudo for creating the partition tables
+```
+
+The files 'fip.bin', 'l-loader.bin' and 'ptable-linux-8g.img' are now built. All the image files are in _$BUILD/l-loader_ directory. The Fastboot App is at _edk2/Build/HiKey/RELEASE_GCC49/AARCH64/AndroidFastbootApp.efi_.
+
+#### EFI boot partition
+
+The boot partition is a 64MB FAT partition only contains fastboot.efi and GRUB2, since the grub.cfg, kernel, initrd and device tree are all loaded from the root file system (grubaa64.efi searches for rootfs label/boot/grub/grub.cfg).
+
+```shell
+wget https://builds.96boards.org/snapshots/reference-platform/components/grub/latest/grubaa64.efi
+mkdir boot-fat
+dd if=/dev/zero of=boot-fat.uefi.img bs=512 count=131072
+sudo mkfs.fat -n "boot" boot-fat.uefi.img
+sudo mount -o loop,rw,sync boot-fat.uefi.img boot-fat
+sudo mkdir -p boot-fat/EFI/BOOT
+sudo cp ${EDK2_DIR}/Build/HiKey/RELEASE_GCC49/AARCH64/AndroidFastbootApp.efi boot-fat/EFI/BOOT/fastboot.efi
+sudo cp grubaa64.efi boot-fat/EFI/BOOT/grubaa64.efi
+sudo umount boot-fat
+sudo mv boot-fat.uefi.img hikey-boot-linux-VERSION.uefi.img
+rm -rf boot-fat
+```
+
+Now just flash the recently created 'hikey-boot-linux-VERSION.uefi.img' with the same instructions as used with the pre-built binaries.