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sdcard_image-rpi.bbclass: Rewrite sdimage creation class - implemented with parted
This implementation doesn't use loop mounts, it uses mcopy to copy files to partitions. The partition creation is done with parted. Because of using these tools the IMAGE_DEPENDS was modified accordingly. Added a way of selecting the desired GPU firmware. Because we don't create the rootfs image but we rely on an already created rootfs image, the stamp is available only in the boot partition. By default the class needs an ext3 rootfs image. This is because we don't have yet a way of generating cmdline.txt in order to pass the partition type to the kernel. By default ext3 is mounted so we use this fs type until this will be selectable while generating a cmdline file. Signed-off-by: Andrei Gherzan <andrei@gherzan.ro>
This commit is contained in:
Andrei Gherzan
parent
4b460a3f78
commit
2567ba074c
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@ -1,131 +1,99 @@
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inherit image
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#
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# Create an image that can by written onto a SD card using dd.
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#
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# The disk layout used is:
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#
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# 0 - 1M - reserved for other data
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# 1M - BOOT_SPACE - bootloader and kernel
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# BOOT_SPACE - SDIMG_SIZE - rootfs
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#
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# Add the fstypes we need
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IMAGE_FSTYPES_append = " tar.bz2 rpi-sdimg"
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inherit image_types
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# Ensure required utilities are present
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IMAGE_DEPENDS_rpi-sdimg = "genext2fs-native e2fsprogs-native bcm2835-bootfiles bcm2835-kernel-image"
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# Set kernel and boot loader
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IMAGE_BOOTLOADER ?= "bcm2835-bootfiles"
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# Register this as an avalable type of image.
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IMAGE_TYPES_append = " rpi-sdimg"
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# Default to 1.4GiB images
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SDIMG_SIZE ?= "4000"
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# Change this to match your host distro
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LOSETUP ?= "/sbin/losetup"
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# Boot partition volume id
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BOOTDD_VOLUME_ID ?= "${MACHINE}"
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# Since these need to go in /etc/fstab we can hardcode them
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# Since the vars are weakly assigned, you can override them from your local.conf
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LOOPDEV ?= "/dev/loop1"
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LOOPDEV_BOOT ?= "/dev/loop2"
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LOOPDEV_FS ?= "/dev/loop3"
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# Addional space for boot partition
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BOOT_SPACE ?= "20MiB"
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# Default to 4GiB images
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SDIMG_SIZE ?= "444"
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# Use an ext3 by default as rootfs
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SDIMG_ROOTFS_TYPE ?= "ext3"
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SDIMG_ROOTFS = "${IMAGE_NAME}.rootfs.${SDIMG_ROOTFS_TYPE}"
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# FS type for rootfs
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ROOTFSTYPE ?= "ext4"
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# Set GPU firmware image to be used
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# arm128 : 128M ARM, 128M GPU split
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# arm192 : 192M ARM, 64M GPU split
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# arm224 : 224M ARM, 32M GPU split
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RPI_GPU_FIRMWARE ?= "arm192"
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BOOTPARTNAME ?= "${MACHINE}"
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IMAGE_DEPENDS_rpi-sdimg = " \
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parted-native \
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mtools-native \
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dosfstools-native \
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virtual/kernel \
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${IMAGE_BOOTLOADER} \
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"
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IMAGEDATESTAMP = "${@time.strftime('%Y.%m.%d',time.gmtime())}"
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# SD card image name
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SDIMG = "${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.rpi-sdimg"
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# Additional files and/or directories to be copied into the vfat partition from the IMAGE_ROOTFS.
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FATPAYLOAD ?= ""
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IMAGEDATESTAMP = "${@time.strftime('%Y.%m.%d',time.gmtime())}"
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IMAGE_CMD_rpi-sdimg () {
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SDIMG=${WORKDIR}/sd.img
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# sanity check fstab entry for boot partition mounting
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if [ "x$(cat /etc/fstab | grep ${LOOPDEV_BOOT} | grep ${WORKDIR}/tmp-mnt-boot | grep user || true)" = "x" ]; then
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echo "/etc/fstab entries need to be created with the user flag for the loop devices like:"
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echo "${LOOPDEV_BOOT} ${WORKDIR}/tmp-mnt-boot vfat user 0 0"
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false
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fi
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# cleanup loops
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for loop in ${LOOPDEV} ${LOOPDEV_BOOT} ${LOOPDEV_FS} ; do
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${LOSETUP} -d $loop || true
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done
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# If an SD image is already present, reuse and reformat it
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if [ ! -e ${SDIMG} ] ; then
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dd if=/dev/zero of=${SDIMG} bs=$(echo '255 * 63 * 512' | bc) count=${SDIMG_SIZE}
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fi
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${LOSETUP} ${LOOPDEV} ${SDIMG}
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# Initialize sdcard image file
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dd if=/dev/zero of=${SDIMG} bs=1 count=0 seek=$(expr 1000 \* 1000 \* ${SDIMG_SIZE})
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# Create partition table
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dd if=/dev/zero of=${LOOPDEV} bs=1024 count=1024
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SIZE=$(/sbin/fdisk -l ${LOOPDEV} | grep Disk | grep bytes | awk '{print $5}')
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CYLINDERS=$(echo $SIZE/255/63/512 | bc)
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{
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echo ,9,0x0C,*
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echo ,,,-
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} | /sbin/sfdisk -D -H 255 -S 63 -C ${CYLINDERS} ${LOOPDEV}
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parted -s ${SDIMG} mklabel msdos
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# Create boot partition and mark it as bootable
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parted -s ${SDIMG} mkpart primary fat32 1MiB ${BOOT_SPACE}
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parted -s ${SDIMG} set 1 boot on
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# Create rootfs partition
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parted -s ${SDIMG} mkpart primary ext2 ${BOOT_SPACE} 100%
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parted ${SDIMG} print
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# Prepare loop devices for boot and filesystem partitions
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BOOT_OFFSET=32256
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FS_OFFSET_SECT=$(/sbin/fdisk -l -u ${LOOPDEV} 2>&1 | grep Linux | perl -p -i -e "s/\s+/ /"|cut -d " " -f 2)
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FS_OFFSET=$(echo "$FS_OFFSET_SECT * 512" | bc)
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FS_SIZE_BLOCKS=$(/sbin/fdisk -l -u ${LOOPDEV} 2>&1 | grep Linux | perl -p -i -e "s/\s+/ /g" \
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|cut -d " " -f 4 | cut -d "+" -f 1)
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# Create a vfat image with boot files
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BOOT_BLOCKS=$(LC_ALL=C parted -s ${SDIMG} unit b print | awk '/ 1 / { print substr($4, 1, length($4 -1)) / 512 /2 }')
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mkfs.vfat -n "${BOOTDD_VOLUME_ID}" -S 512 -C ${WORKDIR}/boot.img $BOOT_BLOCKS
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case "${RPI_GPU_FIRMWARE}" in
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"arm128" | "arm192" | "arm224")
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mcopy -i ${WORKDIR}/boot.img -s ${DEPLOY_DIR_IMAGE}/bcm2835-bootfiles/${RPI_GPU_FIRMWARE}_start.elf ::start.elf
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;;
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*)
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bberror "RPI_GPU_FIRMWARE is undefined or value not recongnised. Possible values: arm128, arm192 or arm224."
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exit 1
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;;
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esac
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LOOPDEV_BLOCKS=$(/sbin/fdisk -l -u ${LOOPDEV} 2>&1 | grep FAT | perl -p -i -e "s/\s+/ /g"|cut -d " " -f 5)
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LOOPDEV_BYTES=$(echo "$LOOPDEV_BLOCKS * 1024" | bc)
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${LOSETUP} -d ${LOOPDEV}
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${LOSETUP} ${LOOPDEV_BOOT} ${SDIMG} -o ${BOOT_OFFSET}
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/sbin/mkfs.vfat ${LOOPDEV_BOOT} -n ${BOOTPARTNAME} $LOOPDEV_BLOCKS
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# Prepare boot partion. First mount the boot partition, and copy the bootloader and supporting files.
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mkdir -p ${WORKDIR}/tmp-mnt-boot
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mount $LOOPDEV_BOOT ${WORKDIR}/tmp-mnt-boot
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echo "Copying bootloader and prepended kernel.img into the boot partition"
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cp -v ${DEPLOY_DIR_IMAGE}/bcm2835-bootfiles/* ${WORKDIR}/tmp-mnt-boot || true
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# To do
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# Copy here a cmdline.txt file generated taking into consideration the partition type
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# of the rootfs
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mcopy -i ${WORKDIR}/boot.img -s ${DEPLOY_DIR_IMAGE}/bcm2835-bootfiles/bootcode.bin ::
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mcopy -i ${WORKDIR}/boot.img -s ${DEPLOY_DIR_IMAGE}/bcm2835-bootfiles/loader.bin ::
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mcopy -i ${WORKDIR}/boot.img -s ${DEPLOY_DIR_IMAGE}/bcm2835-bootfiles/kernel.img ::
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if [ -n ${FATPAYLOAD} ] ; then
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echo "Copying payload into VFAT"
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for entry in ${FATPAYLOAD} ; do
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# add the || true to stop aborting on vfat issues like not supporting .~lock files
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cp -av ${IMAGE_ROOTFS}$entry ${WORKDIR}/tmp-mnt-boot || true
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mcopy -i ${WORKDIR}/boot.img -s -v ${IMAGE_ROOTFS}$entry :: || true
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done
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fi
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echo "${IMAGE_NAME}-${IMAGEDATESTAMP}" > ${IMAGE_ROOTFS}/etc/image-version-info
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# Add stamp file
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echo "${IMAGE_NAME}-${IMAGEDATESTAMP}" > ${WORKDIR}/image-version-info
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mcopy -i ${WORKDIR}/boot.img -v ${WORKDIR}//image-version-info ::
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cp -v ${IMAGE_ROOTFS}/etc/image-version-info ${WORKDIR}/tmp-mnt-boot || true
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# Cleanup VFAT mount
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echo "Cleaning up VFAT mount"
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umount ${WORKDIR}/tmp-mnt-boot
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${LOSETUP} -d ${LOOPDEV_BOOT} || true
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# Prepare rootfs parition
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echo "Creating rootfs loopback"
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${LOSETUP} ${LOOPDEV_FS} ${SDIMG} -o ${FS_OFFSET}
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FS_NUM_INODES=$(echo $FS_SIZE_BLOCKS / 4 | bc)
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case "${ROOTFSTYPE}" in
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ext3)
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genext2fs -z -N $FS_NUM_INODES -b $FS_SIZE_BLOCKS -d ${IMAGE_ROOTFS} ${LOOPDEV_FS}
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tune2fs -L ${IMAGE_NAME} -j ${LOOPDEV_FS}
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;;
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ext4)
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genext2fs -z -N $FS_NUM_INODES -b $FS_SIZE_BLOCKS -d ${IMAGE_ROOTFS} ${LOOPDEV_FS}
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tune2fs -L ${IMAGE_NAME} -j -O extents,uninit_bg,dir_index ${LOOPDEV_FS}
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;;
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*)
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echo "Please set ROOTFSTYPE to something supported"
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exit 1
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;;
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esac
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${LOSETUP} -d ${LOOPDEV_FS} || true
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gzip -c ${WORKDIR}/sd.img > ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}-${IMAGEDATESTAMP}.img.gz
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rm -f ${WORKDIR}/sd.img
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# Burn Partitions
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dd if=${WORKDIR}/boot.img of=${SDIMG} conv=notrunc seek=1 bs=1M && sync && sync
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dd if=${SDIMG_ROOTFS} of=${SDIMG} conv=notrunc seek=1 bs=${BOOT_SPACE} && sync && sync
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}
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