4baffa02ce
Instead of writing to the currently booted partition set, this implements full dual-boot support for sysupgrade by always writing to the other, currently inactive, partition set and toggling the dualflag after a successful flash. The currently active/ booted partition set is determined by parsing /proc/cmdline for its rootfs parameter (supplied by the DTS), instead of reading from the 0:DUAL_FLAG mtd, in order to prevent (potentially) bricking both partition sets. Signed-off-by: Stefan Lippers-Hollmann <s.l-h@gmx.de>
122 lines
2.4 KiB
Bash
122 lines
2.4 KiB
Bash
#
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# Copyright (C) 2016 lede-project.org
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#
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zyxel_get_rootfs() {
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local rootfsdev
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if read cmdline < /proc/cmdline; then
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case "$cmdline" in
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*root=*)
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rootfsdev="${cmdline##*root=}"
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rootfsdev="${rootfsdev%% *}"
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;;
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esac
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echo "${rootfsdev}"
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fi
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}
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zyxel_do_flash() {
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local tar_file=$1
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local kernel=$2
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local rootfs=$3
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local dualflagmtd=$4
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# keep sure its unbound
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losetup --detach-all || {
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echo Failed to detach all loop devices. Skip this try.
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reboot -f
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}
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# use the first found directory in the tar archive
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local board_dir=$(tar tf $tar_file | grep -m 1 '^sysupgrade-.*/$')
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board_dir=${board_dir%/}
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echo "flashing kernel to $kernel"
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tar xf $tar_file ${board_dir}/kernel -O >$kernel
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echo "flashing rootfs to ${rootfs}"
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tar xf $tar_file ${board_dir}/root -O >"${rootfs}"
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# a padded rootfs is needed for overlay fs creation
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local offset=$(tar xf $tar_file ${board_dir}/root -O | wc -c)
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[ $offset -lt 65536 ] && {
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echo Wrong size for rootfs: $offset
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sleep 10
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reboot -f
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}
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# Mount loop for rootfs_data
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local loopdev="$(losetup -f)"
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losetup -o $offset $loopdev $rootfs || {
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echo "Failed to mount looped rootfs_data."
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sleep 10
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reboot -f
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}
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echo "Format new rootfs_data at position ${offset}."
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mkfs.ext4 -F -L rootfs_data $loopdev
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mkdir /tmp/new_root
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mount -t ext4 $loopdev /tmp/new_root && {
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echo "Saving config to rootfs_data at position ${offset}."
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cp -v /tmp/sysupgrade.tgz /tmp/new_root/
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umount /tmp/new_root
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}
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# flashing successful, toggle the dualflag
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case "$rootfs" in
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"/dev/mmcblk0p5")
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printf "\xff" >$dualflagmtd
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;;
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"/dev/mmcblk0p8")
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printf "\x01" >$dualflagmtd
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;;
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esac
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# Cleanup
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losetup -d $loopdev >/dev/null 2>&1
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sync
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umount -a
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reboot -f
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}
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zyxel_do_upgrade() {
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local tar_file="$1"
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local board=$(board_name)
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local rootfs="$(zyxel_get_rootfs)"
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local kernel=
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[ -b "${rootfs}" ] || return 1
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case "$board" in
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zyxel,nbg6817)
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local dualflagmtd="$(find_mtd_part 0:DUAL_FLAG)"
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[ -b $dualflagmtd ] || return 1
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case "$rootfs" in
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"/dev/mmcblk0p5")
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# booted from the primary partition set
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# write to the alternative set
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kernel="/dev/mmcblk0p7"
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rootfs="/dev/mmcblk0p8"
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;;
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"/dev/mmcblk0p8")
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# booted from the alternative partition set
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# write to the primary set
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kernel="/dev/mmcblk0p4"
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rootfs="/dev/mmcblk0p5"
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;;
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*)
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return 1
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;;
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esac
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;;
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*)
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return 1
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;;
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esac
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zyxel_do_flash $tar_file $kernel $rootfs $dualflagmtd
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return 0
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}
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