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| -rw-r--r-- | classes/sdcard_image.bbclass | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/classes/sdcard_image.bbclass b/classes/sdcard_image.bbclass new file mode 100644 index 0000000..de3682f --- /dev/null +++ b/classes/sdcard_image.bbclass @@ -0,0 +1,87 @@ +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 +} |