There are 3 repositories under edk2-platforms topic.
Broken edk2 port for Qualcomm platforms xD
Raspberry Pi 4 UEFI Firmware Images
Raspberry Pi 3 UEFI Firmware Images
EDK2 firmware images for Raspberry Pi 5
A UEFI Firmware for Dipper(Xiaomi MI 8)
Porting edk2 to nubia Z20 (nx627j)
Open-source PLDM communication between the HOST (UEFI firmware) and BMC