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ipq806x: switch to full dual-boot for the nbg6817 sysupgrade support

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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>
This commit is contained in:
Stefan Lippers-Hollmann 2018-01-18 22:41:44 +01:00 committed by John Crispin
parent 42fe7b3bbe
commit 4baffa02ce
1 changed files with 23 additions and 3 deletions
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26
target/linux/ipq806x/base-files/lib/upgrade/zyxel.sh
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@ -21,6 +21,7 @@ zyxel_do_flash() {
local tar_file=$1
local kernel=$2
local rootfs=$3
local dualflagmtd=$4
# keep sure its unbound
losetup --detach-all || {
@ -63,6 +64,16 @@ zyxel_do_flash() {
umount /tmp/new_root
}
# flashing successful, toggle the dualflag
case "$rootfs" in
"/dev/mmcblk0p5")
printf "\xff" >$dualflagmtd
;;
"/dev/mmcblk0p8")
printf "\x01" >$dualflagmtd
;;
esac
# Cleanup
losetup -d $loopdev >/dev/null 2>&1
sync
@ -79,12 +90,21 @@ zyxel_do_upgrade() {
[ -b "${rootfs}" ] || return 1
case "$board" in
zyxel,nbg6817)
local dualflagmtd="$(find_mtd_part 0:DUAL_FLAG)"
[ -b $dualflagmtd ] || return 1
case "$rootfs" in
"/dev/mmcblk0p5")
kernel="/dev/mmcblk0p4"
# booted from the primary partition set
# write to the alternative set
kernel="/dev/mmcblk0p7"
rootfs="/dev/mmcblk0p8"
;;
"/dev/mmcblk0p8")
kernel="/dev/mmcblk0p7"
# booted from the alternative partition set
# write to the primary set
kernel="/dev/mmcblk0p4"
rootfs="/dev/mmcblk0p5"
;;
*)
return 1
@ -96,7 +116,7 @@ zyxel_do_upgrade() {
;;
esac
zyxel_do_flash $tar_file $kernel $rootfs
zyxel_do_flash $tar_file $kernel $rootfs $dualflagmtd
return 0
}