169 lines
5.1 KiB
Plaintext
169 lines
5.1 KiB
Plaintext
# boot-directdisk.bbclass
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# (loosly based off bootimg.bbclass Copyright (C) 2004, Advanced Micro Devices, Inc.)
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#
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# Create an image which can be placed directly onto a harddisk using dd and then
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# booted.
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#
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# This uses syslinux. extlinux would have been nice but required the ext2/3
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# partition to be mounted. grub requires to run itself as part of the install
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# process.
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#
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# The end result is a 512 boot sector populated with an MBR and partition table
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# followed by an msdos fat16 partition containing syslinux and a linux kernel
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# completed by the ext2/3 rootfs.
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#
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# We have to push the msdos parition table size > 16MB so fat 16 is used as parted
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# won't touch fat12 partitions.
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# External variables needed
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# ${ROOTFS} - the rootfs image to incorporate
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do_bootdirectdisk[depends] += "dosfstools-native:do_populate_sysroot \
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syslinux:do_populate_sysroot \
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syslinux-native:do_populate_sysroot \
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parted-native:do_populate_sysroot \
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mtools-native:do_populate_sysroot "
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PACKAGES = " "
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EXCLUDE_FROM_WORLD = "1"
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BOOTDD_VOLUME_ID ?= "boot"
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BOOTDD_EXTRA_SPACE ?= "16384"
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EFI = "${@base_contains("MACHINE_FEATURES", "efi", "1", "0", d)}"
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EFI_CLASS = "${@base_contains("MACHINE_FEATURES", "efi", "grub-efi", "", d)}"
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# Include legacy boot if MACHINE_FEATURES includes "pcbios" or if it does not
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# contain "efi". This way legacy is supported by default if neither is
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# specified, maintaining the original behavior.
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def pcbios(d):
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pcbios = base_contains("MACHINE_FEATURES", "pcbios", "1", "0", d)
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if pcbios == "0":
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pcbios = base_contains("MACHINE_FEATURES", "efi", "0", "1", d)
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return pcbios
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def pcbios_class(d):
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if d.getVar("PCBIOS", True) == "1":
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return "syslinux"
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return ""
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PCBIOS = "${@pcbios(d)}"
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PCBIOS_CLASS = "${@pcbios_class(d)}"
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inherit ${PCBIOS_CLASS}
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inherit ${EFI_CLASS}
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# Get the build_syslinux_cfg() function from the syslinux class
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AUTO_SYSLINUXCFG = "1"
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DISK_SIGNATURE ?= "${DISK_SIGNATURE_GENERATED}"
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SYSLINUX_ROOT ?= "root=/dev/sda2"
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SYSLINUX_TIMEOUT ?= "10"
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boot_direct_populate() {
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dest=$1
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install -d $dest
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# Install bzImage, initrd, and rootfs.img in DEST for all loaders to use.
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install -m 0644 ${STAGING_KERNEL_DIR}/bzImage $dest/vmlinuz
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if [ -n "${INITRD}" ] && [ -s "${INITRD}" ]; then
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install -m 0644 ${INITRD} $dest/initrd
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fi
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}
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build_boot_dd() {
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HDDDIR="${S}/hdd/boot"
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HDDIMG="${S}/hdd.image"
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IMAGE=${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.hdddirect
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boot_direct_populate $HDDDIR
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if [ "${PCBIOS}" = "1" ]; then
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syslinux_hddimg_populate $HDDDIR
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fi
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if [ "${EFI}" = "1" ]; then
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grubefi_hddimg_populate $HDDDIR
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fi
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BLOCKS=`du -bks $HDDDIR | cut -f 1`
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BLOCKS=`expr $BLOCKS + ${BOOTDD_EXTRA_SPACE}`
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# Ensure total sectors is an integral number of sectors per
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# track or mcopy will complain. Sectors are 512 bytes, and we
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# generate images with 32 sectors per track. This calculation is
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# done in blocks, thus the mod by 16 instead of 32.
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BLOCKS=$(expr $BLOCKS + $(expr 16 - $(expr $BLOCKS % 16)))
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mkdosfs -n ${BOOTDD_VOLUME_ID} -S 512 -C $HDDIMG $BLOCKS
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mcopy -i $HDDIMG -s $HDDDIR/* ::/
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if [ "${PCBIOS}" = "1" ]; then
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syslinux_hdddirect_install $HDDIMG
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fi
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chmod 644 $HDDIMG
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ROOTFSBLOCKS=`du -Lbks ${ROOTFS} | cut -f 1`
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TOTALSIZE=`expr $BLOCKS + $ROOTFSBLOCKS`
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END1=`expr $BLOCKS \* 1024`
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END2=`expr $END1 + 512`
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END3=`expr \( $ROOTFSBLOCKS \* 1024 \) + $END1`
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echo $ROOTFSBLOCKS $TOTALSIZE $END1 $END2 $END3
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rm -rf $IMAGE
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dd if=/dev/zero of=$IMAGE bs=1024 seek=$TOTALSIZE count=1
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parted $IMAGE mklabel msdos
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parted $IMAGE mkpart primary fat16 0 ${END1}B
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parted $IMAGE unit B mkpart primary ext2 ${END2}B ${END3}B
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parted $IMAGE set 1 boot on
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parted $IMAGE print
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awk "BEGIN { printf \"$(echo ${DISK_SIGNATURE} | fold -w 2 | tac | paste -sd '' | sed 's/\(..\)/\\x&/g')\" }" | \
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dd of=$IMAGE bs=1 seek=440 conv=notrunc
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OFFSET=`expr $END2 / 512`
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if [ "${PCBIOS}" = "1" ]; then
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dd if=${STAGING_DATADIR}/syslinux/mbr.bin of=$IMAGE conv=notrunc
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fi
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dd if=$HDDIMG of=$IMAGE conv=notrunc seek=1 bs=512
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dd if=${ROOTFS} of=$IMAGE conv=notrunc seek=$OFFSET bs=512
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cd ${DEPLOY_DIR_IMAGE}
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rm -f ${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.hdddirect
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ln -s ${IMAGE_NAME}.hdddirect ${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.hdddirect
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}
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python do_bootdirectdisk() {
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validate_disk_signature(d)
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if d.getVar("PCBIOS", True) == "1":
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bb.build.exec_func('build_syslinux_cfg', d)
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if d.getVar("EFI", True) == "1":
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bb.build.exec_func('build_grub_cfg', d)
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bb.build.exec_func('build_boot_dd', d)
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}
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def generate_disk_signature():
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import uuid
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signature = str(uuid.uuid4())[:8]
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if signature != '00000000':
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return signature
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else:
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return 'ffffffff'
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def validate_disk_signature(d):
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import re
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disk_signature = d.getVar("DISK_SIGNATURE", True)
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if not re.match(r'^[0-9a-fA-F]{8}$', disk_signature):
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bb.fatal("DISK_SIGNATURE '%s' must be an 8 digit hex string" % disk_signature)
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DISK_SIGNATURE_GENERATED := "${@generate_disk_signature()}"
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addtask bootdirectdisk before do_build
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