cur_boot_part="$(/usr/sbin/fw_printenv -n boot_part)"
if [ -z "${cur_boot_part}" ]; then
- mtd_ubi0=$(cat /sys/devices/virtual/ubi/ubi0/mtd_num)
+ mtd_ubi0=$(cat /sys/class/ubi/ubi0/mtd_num)
case "$(grep -E "^mtd${mtd_ubi0}:" /proc/mtd | cut -d '"' -f 2)" in
kernel|rootfs)
cur_boot_part=1