269 lines
8.4 KiB
Plaintext
269 lines
8.4 KiB
Plaintext
# Copyright (C) 2004, Advanced Micro Devices, Inc. All Rights Reserved
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# Released under the MIT license (see packages/COPYING)
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# Creates a bootable image using syslinux, your kernel and an optional
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# initrd
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#
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# End result is two things:
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#
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# 1. A .hddimg file which is an msdos filesystem containing syslinux, a kernel,
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# an initrd and a rootfs image. These can be written to harddisks directly and
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# also booted on USB flash disks (write them there with dd).
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#
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# 2. A CD .iso image
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# Boot process is that the initrd will boot and process which label was selected
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# in syslinux. Actions based on the label are then performed (e.g. installing to
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# an hdd)
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# External variables (also used by syslinux.bbclass)
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# ${INITRD} - indicates a list of filesystem images to concatenate and use as an initrd (optional)
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# ${COMPRESSISO} - Transparent compress ISO, reduce size ~40% if set to 1
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# ${NOISO} - skip building the ISO image if set to 1
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# ${NOHDD} - skip building the HDD image if set to 1
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# ${HDDIMG_ID} - FAT image volume-id
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# ${ROOTFS} - indicates a filesystem image to include as the root filesystem (optional)
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do_bootimg[depends] += "dosfstools-native:do_populate_sysroot \
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mtools-native:do_populate_sysroot \
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cdrtools-native:do_populate_sysroot \
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virtual/kernel:do_deploy \
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${@oe.utils.ifelse(d.getVar('COMPRESSISO'),'zisofs-tools-native:do_populate_sysroot','')}"
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PACKAGES = " "
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EXCLUDE_FROM_WORLD = "1"
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HDDDIR = "${S}/hddimg"
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ISODIR = "${S}/iso"
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EFIIMGDIR = "${S}/efi_img"
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COMPACT_ISODIR = "${S}/iso.z"
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COMPRESSISO ?= "0"
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BOOTIMG_VOLUME_ID ?= "boot"
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BOOTIMG_EXTRA_SPACE ?= "512"
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EFI = "${@bb.utils.contains("MACHINE_FEATURES", "efi", "1", "0", d)}"
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EFI_PROVIDER ?= "grub-efi"
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EFI_CLASS = "${@bb.utils.contains("MACHINE_FEATURES", "efi", "${EFI_PROVIDER}", "", d)}"
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# Include legacy boot if MACHINE_FEATURES includes "pcbios" or if it does not
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# contain "efi". This way legacy is supported by default if neither is
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# specified, maintaining the original behavior.
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def pcbios(d):
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pcbios = bb.utils.contains("MACHINE_FEATURES", "pcbios", "1", "0", d)
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if pcbios == "0":
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pcbios = bb.utils.contains("MACHINE_FEATURES", "efi", "0", "1", d)
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return pcbios
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PCBIOS = "${@pcbios(d)}"
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# The syslinux is required for the isohybrid command and boot catalog
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inherit syslinux
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inherit ${EFI_CLASS}
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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 ${DEPLOY_DIR_IMAGE}/bzImage ${DEST}/vmlinuz
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# initrd is made of concatenation of multiple filesystem images
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if [ -n "${INITRD}" ]; then
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rm -f ${DEST}/initrd
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for fs in ${INITRD}
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do
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if [ -s "${fs}" ]; then
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cat ${fs} >> ${DEST}/initrd
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else
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bbfatal "${fs} is invalid. initrd image creation failed."
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fi
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done
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chmod 0644 ${DEST}/initrd
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fi
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if [ -n "${ROOTFS}" ] && [ -s "${ROOTFS}" ]; then
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install -m 0644 ${ROOTFS} ${DEST}/rootfs.img
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fi
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}
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build_iso() {
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# Only create an ISO if we have an INITRD and NOISO was not set
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if [ -z "${INITRD}" ] || [ "${NOISO}" = "1" ]; then
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bbnote "ISO image will not be created."
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return
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fi
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# ${INITRD} is a list of multiple filesystem images
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for fs in ${INITRD}
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do
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if [ ! -s "${fs}" ]; then
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bbnote "ISO image will not be created. ${fs} is invalid."
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return
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fi
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done
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populate ${ISODIR}
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if [ "${PCBIOS}" = "1" ]; then
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syslinux_iso_populate ${ISODIR}
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fi
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if [ "${EFI}" = "1" ]; then
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efi_iso_populate ${ISODIR}
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build_fat_img ${EFIIMGDIR} ${ISODIR}/efi.img
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fi
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# EFI only
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if [ "${PCBIOS}" != "1" ] && [ "${EFI}" = "1" ] ; then
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# Work around bug in isohybrid where it requires isolinux.bin
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# In the boot catalog, even though it is not used
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mkdir -p ${ISODIR}/${ISOLINUXDIR}
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install -m 0644 ${STAGING_DATADIR}/syslinux/isolinux.bin ${ISODIR}${ISOLINUXDIR}
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fi
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if [ "${COMPRESSISO}" = "1" ] ; then
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# create compact directory, compress iso
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mkdir -p ${COMPACT_ISODIR}
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mkzftree -z 9 -p 4 -F ${ISODIR}/rootfs.img ${COMPACT_ISODIR}/rootfs.img
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# move compact iso to iso, then remove compact directory
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mv ${COMPACT_ISODIR}/rootfs.img ${ISODIR}/rootfs.img
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rm -Rf ${COMPACT_ISODIR}
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mkisofs_compress_opts="-R -z -D -l"
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else
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mkisofs_compress_opts="-r"
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fi
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if [ "${PCBIOS}" = "1" ] && [ "${EFI}" != "1" ] ; then
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# PCBIOS only media
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mkisofs -V ${BOOTIMG_VOLUME_ID} \
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-o ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.iso \
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-b ${ISO_BOOTIMG} -c ${ISO_BOOTCAT} \
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$mkisofs_compress_opts \
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${MKISOFS_OPTIONS} ${ISODIR}
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else
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# EFI only OR EFI+PCBIOS
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mkisofs -A ${BOOTIMG_VOLUME_ID} -V ${BOOTIMG_VOLUME_ID} \
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-o ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.iso \
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-b ${ISO_BOOTIMG} -c ${ISO_BOOTCAT} \
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$mkisofs_compress_opts ${MKISOFS_OPTIONS} \
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-eltorito-alt-boot -eltorito-platform efi \
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-b efi.img -no-emul-boot \
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${ISODIR}
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isohybrid_args="-u"
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fi
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isohybrid $isohybrid_args ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.iso
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cd ${DEPLOY_DIR_IMAGE}
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rm -f ${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.iso
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ln -s ${IMAGE_NAME}.iso ${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.iso
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}
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build_fat_img() {
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FATSOURCEDIR=$1
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FATIMG=$2
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# Calculate the size required for the final image including the
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# data and filesystem overhead.
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# Sectors: 512 bytes
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# Blocks: 1024 bytes
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# Determine the sector count just for the data
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SECTORS=$(expr $(du --apparent-size -ks ${FATSOURCEDIR} | cut -f 1) \* 2)
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# Account for the filesystem overhead. This includes directory
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# entries in the clusters as well as the FAT itself.
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# Assumptions:
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# FAT32 (12 or 16 may be selected by mkdosfs, but the extra
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# padding will be minimal on those smaller images and not
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# worth the logic here to caclulate the smaller FAT sizes)
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# < 16 entries per directory
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# 8.3 filenames only
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# 32 bytes per dir entry
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DIR_BYTES=$(expr $(find ${FATSOURCEDIR} | tail -n +2 | wc -l) \* 32)
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# 32 bytes for every end-of-directory dir entry
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DIR_BYTES=$(expr $DIR_BYTES + $(expr $(find ${FATSOURCEDIR} -type d | tail -n +2 | wc -l) \* 32))
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# 4 bytes per FAT entry per sector of data
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FAT_BYTES=$(expr $SECTORS \* 4)
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# 4 bytes per FAT entry per end-of-cluster list
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FAT_BYTES=$(expr $FAT_BYTES + $(expr $(find ${FATSOURCEDIR} -type d | tail -n +2 | wc -l) \* 4))
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# Use a ceiling function to determine FS overhead in sectors
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DIR_SECTORS=$(expr $(expr $DIR_BYTES + 511) / 512)
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# There are two FATs on the image
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FAT_SECTORS=$(expr $(expr $(expr $FAT_BYTES + 511) / 512) \* 2)
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SECTORS=$(expr $SECTORS + $(expr $DIR_SECTORS + $FAT_SECTORS))
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# Determine the final size in blocks accounting for some padding
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BLOCKS=$(expr $(expr $SECTORS / 2) + ${BOOTIMG_EXTRA_SPACE})
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# Ensure total sectors is an integral number of sectors per
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# track or mcopy will complain. Sectors are 512 bytes, and we
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# generate images with 32 sectors per track. This calculation is
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# done in blocks, thus the mod by 16 instead of 32.
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BLOCKS=$(expr $BLOCKS + $(expr 16 - $(expr $BLOCKS % 16)))
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# mkdosfs will sometimes use FAT16 when it is not appropriate,
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# resulting in a boot failure from SYSLINUX. Use FAT32 for
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# images larger than 512MB, otherwise let mkdosfs decide.
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if [ $(expr $BLOCKS / 1024) -gt 512 ]; then
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FATSIZE="-F 32"
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fi
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if [ -z "${HDDIMG_ID}" ]; then
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mkdosfs ${FATSIZE} -n ${BOOTIMG_VOLUME_ID} -S 512 -C ${FATIMG} \
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${BLOCKS}
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else
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mkdosfs ${FATSIZE} -n ${BOOTIMG_VOLUME_ID} -S 512 -C ${FATIMG} \
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${BLOCKS} -i ${HDDIMG_ID}
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fi
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# Copy FATSOURCEDIR recursively into the image file directly
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mcopy -i ${FATIMG} -s ${FATSOURCEDIR}/* ::/
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}
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build_hddimg() {
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# Create an HDD image
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if [ "${NOHDD}" != "1" ] ; then
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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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efi_hddimg_populate ${HDDDIR}
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fi
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build_fat_img ${HDDDIR} ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.hddimg
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if [ "${PCBIOS}" = "1" ]; then
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syslinux_hddimg_install
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fi
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chmod 644 ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.hddimg
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cd ${DEPLOY_DIR_IMAGE}
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rm -f ${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.hddimg
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ln -s ${IMAGE_NAME}.hddimg ${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.hddimg
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fi
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}
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python do_bootimg() {
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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_efi_cfg', d)
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bb.build.exec_func('build_hddimg', d)
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bb.build.exec_func('build_iso', d)
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}
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IMAGE_TYPEDEP_iso = "ext3"
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IMAGE_TYPEDEP_hddimg = "ext3"
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IMAGE_TYPES_MASKED += "iso hddimg"
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addtask bootimg before do_build
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