Based on fxsheep's port for Xiaomi Mi 6 (sagit) (https://github.com/fxsheep/edk2-sagit/).

What works:

• Display
• UEFI Shell

What does not work:

• Clocks
• eMMC (SdccDxe requires Clocks) ...

Anyway, if anyone is willing to help, please join our Discord server DanctNIX.

Tested on Ubuntu 18.04.

First, clone EDK2.

cd ..
git clone https://github.com/tianocore/edk2.git --recursive
git clone https://github.com/tianocore/edk2-platforms.git

You should have all three directories side by side.

Next, install dependencies:

18.04:

sudo apt install build-essential uuid-dev iasl git nasm python3-distutils gcc-aarch64-linux-gnu abootimg

Also see EDK2 website

Finally, ./build.sh.

Then fastboot flash boot uefi.img.

This is based on fxsheep's Mi6 port, which is based on zhuowei's edk2-pixel3.
SimpleFbDxe screen driver is from imbushuo's Lumia950XLPkg.
Special thanks to @lemon1ice and @imbushuo for guidance.