rampis: mt7621: Edgerouter-X disable toggling of kernel slots

Uboot selects which kernel slot to boot based on a flag in the factory
mtd partition. Patch ubnt.sh to ensure always flash to kernel1 slot and
update flag if required.

Signed-off-by: Tim Lunn <tim@feathertop.org>
Tested-by: Mauri Sandberg <maukka@ext.kapsi.fi>
Link: https://github.com/openwrt/openwrt/pull/15194
Signed-off-by: Petr Štetiar <ynezz@true.cz>

diff --git a/target/linux/ramips/mt7621/base-files/lib/upgrade/ubnt.sh b/target/linux/ramips/mt7621/base-files/lib/upgrade/ubnt.sh
index 748ec8e6286ee6acf0fe6957308088935653fe6d..7e9d937d79f856f425a4f0c823ffb9d3c6400dfd 100644 (file)
--- a/target/linux/ramips/mt7621/base-files/lib/upgrade/ubnt.sh
+++ b/target/linux/ramips/mt7621/base-files/lib/upgrade/ubnt.sh
@@ -8,32 +8,16 @@
 
 UBNT_ERX_KERNEL_INDEX_OFFSET=160
 
-ubnt_get_target_kernel() {
+ubnt_update_kernel_flag() {
        local factory_mtd=$1
-       local current_kernel_index=$(hexdump -s $UBNT_ERX_KERNEL_INDEX_OFFSET -n 1 -e '/1 "%X "' ${factory_mtd})
+       local kernel_index=$(hexdump -s $UBNT_ERX_KERNEL_INDEX_OFFSET -n 1 -e '/1 "%X "' ${factory_mtd})
 
-       if [ $current_kernel_index == "0" ]; then
-               echo 'kernel2'
-       elif [ $current_kernel_index == "1" ]; then
-               echo 'kernel1'
-       fi
-}
-
-ubnt_update_target_kernel() {
-       local factory_mtd=$1
-       local kernel_part=$2
-
-       local new_kernel_index
-       if [ $kernel_part == "kernel1" ]; then
-               new_kernel_index="\x00"
-       elif [ $kernel_part == "kernel2" ]; then
-               new_kernel_index="\x01"
-       else
-               echo 'Unknown kernel image index' >&2
-               return 1
+       if [ $kernel_index = "0" ]; then
+               echo "Kernel flag already set to kernel slot 1"
+               return 0
        fi
 
-       if ! (echo -e $new_kernel_index | dd of=${factory_mtd} bs=1 count=1 seek=$UBNT_ERX_KERNEL_INDEX_OFFSET); then
+       if ! (echo -e "\x00" | dd of=${factory_mtd} bs=1 count=1 seek=$UBNT_ERX_KERNEL_INDEX_OFFSET); then
                echo 'Failed to update kernel bootup index' >&2
                return 1
        fi
@@ -46,15 +30,6 @@ platform_upgrade_ubnt_erx() {
                exit 1
        fi
 
-       local kernel_part="$(ubnt_get_target_kernel ${factory_mtd})"
-       if [ -z "$kernel_part" ]; then
-               echo "cannot find factory partition" >&2
-               exit 1
-       fi
-
-       # This is a global defined in nand.sh, sets partition kernel will be flashed into
-       CI_KERNPART=${kernel_part}
-
        #Remove volume possibly left over from stock firmware
        local ubidev="$( nand_find_ubi "$CI_UBIPART" )"
        if [ -z "$ubidev" ]; then
@@ -72,7 +47,7 @@ platform_upgrade_ubnt_erx() {
                [ -n "$troot_ubivol" ] && ubirmvol /dev/$ubidev -N troot || true
        fi
 
-       ubnt_update_target_kernel ${factory_mtd} ${kernel_part} || exit 1
+       ubnt_update_kernel_flag ${factory_mtd} || exit 1
 
        nand_do_upgrade "$1"
 }