- KERNEL := kernel-bin | append-dtb | lzma | tplink-v1-header
- IMAGE/sysupgrade.bin := append-rootfs | tplink-safeloader sysupgrade | append-metadata
+ KERNEL := kernel-bin | append-dtb | lzma | tplink-v1-header -O
+ IMAGE/sysupgrade.bin := append-rootfs | tplink-safeloader sysupgrade | \
+ append-metadata | check-size $$$$(IMAGE_SIZE)