I need help with SD card

I am trying to bring up the Hikey 960 board from SD card. But I am not finding an image that flashes the SD card with Bootloader, RFS and kernel image. All the links i have come across are suggesting how to flash the eMMC.
Help?

I didn’t think this was supported on Hikey960 (although I believe the UEFI firmware for hikey960 has seen some updates recently so I could be out of date).

If the platform supports booting from SD (or USB) it will be using normal EFI protocol (e.g. bootloader such as grub must be in an EFI system partition and called /BOOT/BOOTAA64.EFI).