boot-directdisk.bbclass: Add direct disk image creation class

Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
2026-05-08 05:09:24 +00:00 · 2010-03-25 11:44:25 +00:00
parent f30bf93e14
commit 027c167878
1 changed files with 92 additions and 0 deletions
@@ -0,0 +1,92 @@
+# boot-directdisk.bbclass
+# (loosly based off bootimg.bbclass Copyright (C) 2004, Advanced Micro Devices, Inc.)
+#
+# Create an image which can be placed directly onto a harddisk using dd and then
+# booted.
+#
+# This uses syslinux. extlinux would have been nice but required the ext2/3 
+# partition to be mounted. grub requires to run itself as part of the install 
+# process.
+#
+# The end result is a 512 boot sector populated with an MBR and partition table
+# followed by an msdos fat16 partition containing syslinux and a linux kernel
+# completed by the ext2/3 rootfs.
+#
+# We have to push the msdos parition table size > 16MB so fat 16 is used as parted
+# won't touch fat12 partitions.
+
+# External variables needed
+
+# ${ROOTFS} - the rootfs image to incorporate
+
+do_bootdirectdisk[depends] += "dosfstools-native:do_populate_sysroot \
+                       syslinux:do_populate_sysroot \
+                       syslinux-installer-native:do_populate_sysroot"
+
+PACKAGES = " "
+EXCLUDE_FROM_WORLD = "1"
+
+HDDDIR = "${S}/hdd/boot"
+HDDIMG = "${S}/hdd.image"
+
+BOOTDD_VOLUME_ID   ?= "boot"
+BOOTDD_EXTRA_SPACE ?= "16384"
+
+# Get the build_syslinux_cfg() function from the syslinux class
+
+AUTO_SYSLINUXCFG = "1"
+LABELS = "boot"
+APPEND = "root=/dev/sda2"
+TIMEOUT = "10"
+SYSLINUXCFG  = "${HDDDIR}/syslinux.cfg"
+SYSLINUXMENU = "${HDDDIR}/menu"
+
+inherit syslinux
+		
+build_boot_dd() {
+	IMAGE=${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.hdddirect
+
+	install -d ${HDDDIR}
+	install -m 0644 ${STAGING_DIR}/${MACHINE}${HOST_VENDOR}-${HOST_OS}/kernel/bzImage ${HDDDIR}/vmlinuz
+	install -m 444 ${STAGING_DATADIR}/syslinux/ldlinux.sys ${HDDDIR}/ldlinux.sys
+
+	BLOCKS=`du -bks ${HDDDIR} | cut -f 1`
+	SIZE=`expr $BLOCKS + ${BOOTDD_EXTRA_SPACE}`
+
+	mkdosfs -n ${BOOTDD_VOLUME_ID} -d ${HDDDIR} -C ${HDDIMG} $SIZE 
+	syslinux ${HDDIMG}
+	chmod 644 ${HDDIMG}
+
+	ROOTFSBLOCKS=`du -Lbks ${ROOTFS} | cut -f 1`
+	TOTALSIZE=`expr $SIZE + $ROOTFSBLOCKS`
+	END1=`expr $SIZE \* 1024`
+	END2=`expr $END1 + 512`
+	END3=`expr \( $ROOTFSBLOCKS \* 1024 \) + $END1`
+
+	echo $ROOTFSBLOCKS $TOTALSIZE $END1 $END2 $END3
+	rm -rf $IMAGE
+	dd if=/dev/zero of=$IMAGE bs=1024 seek=$TOTALSIZE count=1
+
+	parted $IMAGE mklabel msdos
+	parted $IMAGE mkpart primary fat16 0 ${END1}B
+	parted $IMAGE unit B mkpart primary ext2 ${END2}B ${END3}B
+	parted $IMAGE set 1 boot on 
+	parted $IMAGE print
+
+	OFFSET=`expr $END2 / 512`
+	dd if=/tmp/mbr.bin of=$IMAGE conv=notrunc
+	dd if=${HDDIMG} of=$IMAGE conv=notrunc seek=1 bs=512
+	dd if=${ROOTFS} of=$IMAGE conv=notrunc seek=$OFFSET bs=512
+
+	cd ${DEPLOY_DIR_IMAGE}
+	rm -f ${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.hdddirect
+	ln -s ${IMAGE_NAME}.hdddirect ${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.hdddirect
+} 
+
+python do_bootdirectdisk() {
+	bb.build.exec_func('build_syslinux_cfg', d)
+	bb.build.exec_func('build_boot_dd', d)
+}
+
+addtask bootdirectdisk before do_build
+do_bootdirectdisk[nostamp] = "1"