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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 }')
if [ -f ${WORKDIR}/boot.img ]; then
rm -f ${WORKDIR}/boot.img
fi
mkfs.vfat -n "${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
}
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