kumquat-buildroot/board/friendlyarm/nanopc-t4/genimage.cfg

image boot.vfat {
        vfat {
                files = {
                        "Image",
                        "rk3399-nanopc-t4.dtb",
                        "extlinux"
                }
        }
        size = 64M
}

image sdcard.img {

        hdimage {
                gpt = true
        }

        partition loader1 {
                image = "idbloader.img"
                offset = 32K
        }

        partition loader2 {
                image = "u-boot.itb"
                offset = 8M
        }

        partition boot {
                partition-type = 0xC
                bootable = "true"
                image = "boot.vfat"
                offset = 16M
        }

        partition rootfs {
                partition-type = 0x83
                image = "rootfs.ext4"
        }
}