No external dependencies other than zlib (for crc32)
No need to be root (losetup, etc)
Kernel must be compiled with CONFIG_EFI=y and CONFIG_EFI_STUB=y
Build this tool: make
Usage: ./efimaker disk.img path/to/bzImage
The resuling image can be booted by a UEFI BIOS, qemu or Azure hyper-V v2.