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inherit image_types

#
# Create an image that can by written onto a SD card using dd.
#
# The disk layout used is:
#
#    0                      -> IMAGE_ROOTFS_ALIGNMENT         - reserved for other data
#    IMAGE_ROOTFS_ALIGNMENT -> BOOT_SPACE                     - bootloader and/or kernel
#    BOOT_SPACE             -> SDIMG_SIZE                     - rootfs
#

#                                                     Default Free space = 1.3x
#                                                     Use IMAGE_OVERHEAD_FACTOR to add more space
#                                                     <--------->
#            4KiB              20MiB           SDIMG_ROOTFS
# <-----------------------> <----------> <---------------------->
#  ------------------------ ------------ ------------------------ -------------------------------
# | IMAGE_ROOTFS_ALIGNMENT | BOOT_SPACE | ROOTFS_SIZE            |     IMAGE_ROOTFS_ALIGNMENT    |
#  ------------------------ ------------ ------------------------ -------------------------------
# ^                        ^            ^                        ^                               ^
# |                        |            |                        |                               |
# 0                      4096     4KiB + 20MiB       4KiB + 20Mib + SDIMG_ROOTFS   4KiB + 20MiB + SDIMG_ROOTFS + 4KiB


# Boot partition volume id
BOOTDD_VOLUME_ID ?= "${MACHINE}"

# Boot partition size [in KiB]
BOOT_SPACE ?= "20480"

# Set alignment to 4MB [in KiB]
IMAGE_ROOTFS_ALIGNMENT = "4096"

# Use an uncompressed ext3 by default as rootfs
SDIMG_ROOTFS_TYPE ?= "ext3"
SDIMG_ROOTFS = "${IMAGE_NAME}.rootfs.${SDIMG_ROOTFS_TYPE}"

IMAGE_DEPENDS_vexpressa9-sdimg = " \
			parted-native \
			mtools-native \
			dosfstools-native \
			virtual/kernel \
			"

# SD card image name
SDIMG = "${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.vexpressa9-sdimg"

IMAGEDATESTAMP = "${@time.strftime('%Y.%m.%d',time.gmtime())}"

IMAGE_CMD_vexpressa9-sdimg () {
	# Align partitions
	BOOT_SPACE_ALIGNED=$(expr ${BOOT_SPACE} + ${IMAGE_ROOTFS_ALIGNMENT} - 1)
	BOOT_SPACE_ALIGNED=$(expr ${BOOT_SPACE_ALIGNED} - ${BOOT_SPACE_ALIGNED} % ${IMAGE_ROOTFS_ALIGNMENT})
	SDIMG_SIZE=$(expr ${IMAGE_ROOTFS_ALIGNMENT} + ${BOOT_SPACE_ALIGNED} + $ROOTFS_SIZE + ${IMAGE_ROOTFS_ALIGNMENT})

	# Initialize sdcard image file
	dd if=/dev/zero of=${SDIMG} bs=1 count=0 seek=$(expr 1024 \* ${SDIMG_SIZE})

	# Create partition table
	parted -s ${SDIMG} mklabel msdos
	# Create boot partition and mark it as bootable
	parted -s ${SDIMG} unit KiB mkpart primary fat32 ${IMAGE_ROOTFS_ALIGNMENT} $(expr ${BOOT_SPACE_ALIGNED} \+ ${IMAGE_ROOTFS_ALIGNMENT})
	parted -s ${SDIMG} set 1 boot on
	# Create rootfs partition
	parted -s ${SDIMG} unit KiB mkpart primary ext2 $(expr ${BOOT_SPACE_ALIGNED} \+ ${IMAGE_ROOTFS_ALIGNMENT}) $(expr ${BOOT_SPACE_ALIGNED} \+ ${IMAGE_ROOTFS_ALIGNMENT} \+ ${ROOTFS_SIZE})
	parted ${SDIMG} print

	# Create a vfat image with boot files
	BOOT_BLOCKS=$(LC_ALL=C parted -s ${SDIMG} unit b print | awk '/ 1 / { print substr($4, 1, length($4 -1)) / 512 /2 }')
	mkfs.vfat -n "${BOOTDD_VOLUME_ID}" -S 512 -C ${WORKDIR}/boot.img $BOOT_BLOCKS
	mcopy -i ${WORKDIR}/boot.img -s ${DEPLOY_DIR_IMAGE}/${KERNEL_IMAGETYPE}-${MACHINE}.bin ::kernel.img

	# Add stamp file
	echo "${IMAGE_NAME}-${IMAGEDATESTAMP}" > ${WORKDIR}/image-version-info
	mcopy -i ${WORKDIR}/boot.img -v ${WORKDIR}//image-version-info ::

	# Burn Partitions
	dd if=${WORKDIR}/boot.img of=${SDIMG} conv=notrunc seek=1 bs=$(expr ${IMAGE_ROOTFS_ALIGNMENT} \* 1024) && sync && sync
	# If SDIMG_ROOTFS_TYPE is a .xz file use xzcat
	if [[ "$SDIMG_ROOTFS_TYPE" == *.xz ]]
	then
		xzcat ${SDIMG_ROOTFS} | dd of=${SDIMG} conv=notrunc seek=1 bs=$(expr 1024 \* ${BOOT_SPACE_ALIGNED} + ${IMAGE_ROOTFS_ALIGNMENT} \* 1024) && sync && sync
	else
		dd if=${SDIMG_ROOTFS} of=${SDIMG} conv=notrunc seek=1 bs=$(expr 1024 \* ${BOOT_SPACE_ALIGNED} + ${IMAGE_ROOTFS_ALIGNMENT} \* 1024) && sync && sync
	fi
}