buildroot/board/sifive/common/genimage_sdcard.cfg

image sdcard.img {
	hdimage {
		partition-table-type = "gpt"
	}

	partition u-boot-spl {
		image = "u-boot-spl.bin"
		offset = 17K
		partition-type-uuid = 5b193300-fc78-40cd-8002-e86c45580b47
	}

	partition u-boot {
		image = "u-boot.itb"
		offset = 1041K
		partition-type-uuid = 2e54b353-1271-4842-806f-e436d6af6985
	}

	partition rootfs {
		image = "rootfs.ext4"
		offset = 4076K
		partition-type-uuid = 0fc63daf-8483-4772-8e79-3d69d8477de4
		bootable = true
	}
}