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# Copyright (C) 2004, Advanced Micro Devices, Inc. All Rights Reserved
# Released under the MIT license (see packages/COPYING)
# Creates a bootable image using syslinux, your kernel and an optional
# initrd
#
# End result is two things:
#
# 1. A .hddimg file which is an msdos filesystem containing syslinux, a kernel,
# an initrd and a rootfs image. These can be written to harddisks directly and
# also booted on USB flash disks (write them there with dd).
#
# 2. A CD .iso image
# Boot process is that the initrd will boot and process which label was selected
# in syslinux. Actions based on the label are then performed (e.g. installing to
# an hdd)
# External variables (also used by syslinux.bbclass)
# ${INITRD} - indicates a filesystem image to use as an initrd (optional)
# ${NOISO} - skip building the ISO image if set to 1
# ${NOHDD} - skip building the HDD image if set to 1
# ${ROOTFS} - indicates a filesystem image to include as the root filesystem (optional)
do_bootimg[depends] += "dosfstools-native:do_populate_sysroot \
mtools-native:do_populate_sysroot \
cdrtools-native:do_populate_sysroot"
PACKAGES = " "
EXCLUDE_FROM_WORLD = "1"
HDDDIR = "${S}/hddimg"
ISODIR = "${S}/iso"
BOOTIMG_VOLUME_ID ?= "boot"
BOOTIMG_EXTRA_SPACE ?= "512"
EFI = "${@base_contains("MACHINE_FEATURES", "efi", "1", "0", d)}"
EFI_CLASS = "${@base_contains("MACHINE_FEATURES", "efi", "grub-efi", "", d)}"
# Include legacy boot if MACHINE_FEATURES includes "pcbios" or if it does not
# contain "efi". This way legacy is supported by default if neither is
# specified, maintaining the original behavior.
def pcbios(d):
pcbios = base_contains("MACHINE_FEATURES", "pcbios", "1", "0", d)
if pcbios == "0":
pcbios = base_contains("MACHINE_FEATURES", "efi", "0", "1", d)
return pcbios
def pcbios_class(d):
if d.getVar("PCBIOS", True) == "1":
return "syslinux"
return ""
PCBIOS = "${@pcbios(d)}"
PCBIOS_CLASS = "${@pcbios_class(d)}"
inherit ${PCBIOS_CLASS}
inherit ${EFI_CLASS}
populate() {
DEST=$1
install -d ${DEST}
# Install bzImage, initrd, and rootfs.img in DEST for all loaders to use.
install -m 0644 ${STAGING_KERNEL_DIR}/bzImage ${DEST}/vmlinuz
if [ -n "${INITRD}" ] && [ -s "${INITRD}" ]; then
install -m 0644 ${INITRD} ${DEST}/initrd
fi
if [ -n "${ROOTFS}" ] && [ -s "${ROOTFS}" ]; then
install -m 0644 ${ROOTFS} ${DEST}/rootfs.img
fi
}
build_iso() {
# Only create an ISO if we have an INITRD and NOISO was not set
if [ -z "${INITRD}" ] || [ ! -s "${INITRD}" ] || [ "${NOISO}" = "1" ]; then
bbnote "ISO image will not be created."
return
fi
populate ${ISODIR}
if [ "${PCBIOS}" = "1" ]; then
syslinux_iso_populate
fi
if [ "${EFI}" = "1" ]; then
grubefi_iso_populate
fi
if [ "${PCBIOS}" = "1" ]; then
mkisofs -V ${BOOTIMG_VOLUME_ID} \
-o ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.iso \
-b ${ISO_BOOTIMG} -c ${ISO_BOOTCAT} -r \
${MKISOFS_OPTIONS} ${ISODIR}
else
bbnote "EFI-only ISO images are untested, please provide feedback."
mkisofs -V ${BOOTIMG_VOLUME_ID} \
-o ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.iso \
-r ${ISODIR}
fi
isohybrid ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.iso
cd ${DEPLOY_DIR_IMAGE}
rm -f ${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.iso
ln -s ${IMAGE_NAME}.iso ${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.iso
}
build_fat_img() {
FATSOURCEDIR=$1
FATIMG=$2
# Calculate the size required for the final image including the
# data and filesystem overhead.
# Sectors: 512 bytes
# Blocks: 1024 bytes
# Determine the sector count just for the data
SECTORS=$(expr $(du --apparent-size -ks ${FATSOURCEDIR} | cut -f 1) \* 2)
# Account for the filesystem overhead. This includes directory
# entries in the clusters as well as the FAT itself.
# Assumptions:
# FAT32 (12 or 16 may be selected by mkdosfs, but the extra
# padding will be minimal on those smaller images and not
# worth the logic here to caclulate the smaller FAT sizes)
# < 16 entries per directory
# 8.3 filenames only
# 32 bytes per dir entry
DIR_BYTES=$(expr $(find ${FATSOURCEDIR} | tail -n +2 | wc -l) \* 32)
# 32 bytes for every end-of-directory dir entry
DIR_BYTES=$(expr $DIR_BYTES + $(expr $(find ${FATSOURCEDIR} -type d | tail -n +2 | wc -l) \* 32))
# 4 bytes per FAT entry per sector of data
FAT_BYTES=$(expr $SECTORS \* 4)
# 4 bytes per FAT entry per end-of-cluster list
FAT_BYTES=$(expr $FAT_BYTES + $(expr $(find ${FATSOURCEDIR} -type d | tail -n +2 | wc -l) \* 4))
# Use a ceiling function to determine FS overhead in sectors
DIR_SECTORS=$(expr $(expr $DIR_BYTES + 511) / 512)
# There are two FATs on the image
FAT_SECTORS=$(expr $(expr $(expr $FAT_BYTES + 511) / 512) \* 2)
SECTORS=$(expr $SECTORS + $(expr $DIR_SECTORS + $FAT_SECTORS))
# Determine the final size in blocks accounting for some padding
BLOCKS=$(expr $(expr $SECTORS / 2) + ${BOOTIMG_EXTRA_SPACE})
# Ensure total sectors is an integral number of sectors per
# track or mcopy will complain. Sectors are 512 bytes, and we
# generate images with 32 sectors per track. This calculation is
# done in blocks, thus the mod by 16 instead of 32.
BLOCKS=$(expr $BLOCKS + $(expr 16 - $(expr $BLOCKS % 16)))
# mkdosfs will sometimes use FAT16 when it is not appropriate,
# resulting in a boot failure from SYSLINUX. Use FAT32 for
# images larger than 512MB, otherwise let mkdosfs decide.
if [ $(expr $BLOCKS / 1024) -gt 512 ]; then
FATSIZE="-F 32"
fi
mkdosfs ${FATSIZE} -n ${BOOTIMG_VOLUME_ID} -S 512 -C ${FATIMG} ${BLOCKS}
# Copy FATSOURCEDIR recursively into the image file directly
mcopy -i ${FATIMG} -s ${FATSOURCEDIR}/* ::/
}
build_hddimg() {
# Create an HDD image
if [ "${NOHDD}" != "1" ] ; then
populate ${HDDDIR}
if [ "${PCBIOS}" = "1" ]; then
syslinux_hddimg_populate
fi
if [ "${EFI}" = "1" ]; then
grubefi_hddimg_populate
fi
build_fat_img ${HDDDIR} ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.hddimg
if [ "${PCBIOS}" = "1" ]; then
syslinux_hddimg_install
fi
chmod 644 ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.hddimg
cd ${DEPLOY_DIR_IMAGE}
rm -f ${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.hddimg
ln -s ${IMAGE_NAME}.hddimg ${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.hddimg
fi
}
python do_bootimg() {
if d.getVar("PCBIOS", True) == "1":
bb.build.exec_func('build_syslinux_cfg', d)
if d.getVar("EFI", True) == "1":
bb.build.exec_func('build_grub_cfg', d)
bb.build.exec_func('build_hddimg', d)
bb.build.exec_func('build_iso', d)
}
addtask bootimg before do_build
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