+ # Prepare TRX file with just a kernel that will replace current one
+ local linux_length=$(grep "\"linux\"" /proc/mtd | sed "s/mtd[0-9]*:[ \t]*\([^ \t]*\).*/\1/")
+ [ -z "$linux_length" ] && {
+ echo "Unable to find \"linux\" partition size"
+ exit 1
+ }
+ linux_length=$((0x$linux_length + 28))
+ rm -f /tmp/null.bin
+ rm -f /tmp/kernel.trx
+ touch /tmp/null.bin
+ otrx create /tmp/kernel.trx \
+ -f $dir/kernel -b $linux_length \
+ -f /tmp/null.bin
+
+ # Prepare UBI image (drop unwanted extra blocks)
+ local ubi_length=0
+ while [ "$(dd if=$dir/root skip=$ubi_length bs=1 count=4 2>/dev/null)" = "UBI#" ]; do
+ ubi_length=$(($ubi_length + 131072))
+ done
+ echo "ubi_length: $ubi_length"
+ dd if=$dir/root of=/tmp/root.ubi bs=131072 count=$((ubi_length / 131072)) 2>/dev/null
+
+ # Flash
+ mtd write /tmp/kernel.trx firmware
+ nand_do_upgrade /tmp/root.ubi