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# Defines the disk.img image type
#
# Add an image type 'disk.img' which creates a disk image
# with up to 4 partitions
#
# For partition 1 (replace 1 by 2 for partition 2, and so on for 3 and 4):
#
# * DISK_IMG_PARTITION1_SIZE is the partition size in MB (1024 is 1 GB)
#
# * DISK_IMG_PARTITION1_FSTYPE is the file system to format the partition with.
# We support only ext files systems (ext2, ext3 and ext4)
# If this is empty, the partition will not be formated.
#
# * DISK_IMG_PARTITION1_CONTENT is the content to put in the filesystem.
# Only 'rootfs' is supported and will create a partition with the Yocto
# root filesystem.
#
# Default values for partition 1
DISK_IMG_PARTITION1_SIZE ??= "2048"
DISK_IMG_PARTITION1_FSTYPE ??= "ext4"
DISK_IMG_PARTITION1_CONTENT ??= "rootfs"
# Default values for partition 2
DISK_IMG_PARTITION2_SIZE ??= "0"
DISK_IMG_PARTITION2_FSTYPE ??= "ext2"
DISK_IMG_PARTITION2_CONTENT ??= ""
# Default values for partition 3
DISK_IMG_PARTITION3_SIZE ??= "0"
DISK_IMG_PARTITION3_FSTYPE ??= "ext4"
DISK_IMG_PARTITION3_CONTENT ??= ""
# Default values for partition 4
DISK_IMG_PARTITION4_SIZE ??= "0"
DISK_IMG_PARTITION4_FSTYPE ??= "ext4"
DISK_IMG_PARTITION4_CONTENT ??= ""
# Default disk sector size
DISK_IMG_SECTOR_SIZE ??= "512"
# We need mkfs.ext and parted tools to create our image (dd is always there)
do_image_disk_img[depends] += "e2fsprogs-native:do_populate_sysroot \
parted-native:do_populate_sysroot"
DISK_IMG_FILE = "${IMGDEPLOYDIR}/${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.disk.img"
# Create one disk partition
disk_img_createpart() {
local imagefile="$1"
local start="$2"
local size="$3"
local fstype="${4:-}"
local content="${5:-}"
local formatargs=""
set -x
rm -f $imagefile
# Create the partition image
dd if=/dev/zero of=$imagefile bs=${DISK_IMG_SECTOR_SIZE} count=0 \
seek=$(expr $size / ${DISK_IMG_SECTOR_SIZE})
if [ -n "$fstype" ]; then
case $content in
rootfs)
formatargs=" -d ${IMAGE_ROOTFS}"
;;
boot)
echo "Unsupported"
exit 1
;;
*)
esac
# Create the file system (with content if needed)
mkfs.$fstype -F $imagefile $formatargs
fi
cat $imagefile >> ${DISK_IMG_FILE}
# Add the partition to the partition table
parted -s ${DISK_IMG_FILE} unit B mkpart primary $start \
$(expr $start + $realsize - 1)
}
disk_img_create () {
local currpos
local realsize
set -x
currpos=${DISK_IMG_SECTOR_SIZE}
# Create reserved part for partition table (1MB)
dd if=/dev/zero of=${DISK_IMG_FILE} bs=${DISK_IMG_SECTOR_SIZE} count=0 \
seek=1
parted -s ${DISK_IMG_FILE} mklabel msdos
if [ ${DISK_IMG_PARTITION1_SIZE} -ne 0 ]; then
# Reduce the first block size of one sector to make space
# for the partition table
realsize=$(expr ${DISK_IMG_PARTITION1_SIZE} \* 1024 \* 1024 \
- ${DISK_IMG_SECTOR_SIZE})
# Create the partition
disk_img_createpart ${WORKDIR}/part1.img $currpos $realsize \
"${DISK_IMG_PARTITION1_FSTYPE}" "${DISK_IMG_PARTITION1_CONTENT}"
currpos=$(expr $currpos + $realsize)
fi
if [ ${DISK_IMG_PARTITION2_SIZE} -ne 0 ]; then
# Partition size
realsize=$(expr ${DISK_IMG_PARTITION2_SIZE} \* 1024 \* 1024)
# Create the partition
disk_img_createpart ${WORKDIR}/part2.img $currpos $realsize \
"${DISK_IMG_PARTITION2_FSTYPE}" "${DISK_IMG_PARTITION2_CONTENT}"
currpos=$(expr $currpos + $realsize)
fi
if [ ${DISK_IMG_PARTITION3_SIZE} -ne 0 ]; then
# Partition size
realsize=$(expr ${DISK_IMG_PARTITION3_SIZE} \* 1024 \* 1024)
# Create the partition
disk_img_createpart ${WORKDIR}/part3.img $currpos $realsize \
"${DISK_IMG_PARTITION3_FSTYPE}" "${DISK_IMG_PARTITION3_CONTENT}"
currpos=$(expr $currpos + $realsize)
fi
if [ ${DISK_IMG_PARTITION4_SIZE} -ne 0 ]; then
# Partition size
realsize=$(expr ${DISK_IMG_PARTITION4_SIZE} \* 1024 \* 1024)
# Create the partition
disk_img_createpart ${WORKDIR}/part4.img $currpos $realsize \
"${DISK_IMG_PARTITION4_FSTYPE}" "${DISK_IMG_PARTITION4_CONTENT}"
currpos=$(expr $currpos + $realsize)
fi
}
IMAGE_CMD_disk.img = "disk_img_create"
IMAGE_TYPES += "disk.img"
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