[openwrt/openwrt] ath79: fix build of big images for TP RE355v1, RE450v1 & v2

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch openwrt-25.12:
https://git.openwrt.org/c3cf33f98bbe1bf4394e331e84da6481788338c1

commit c3cf33f98bbe1bf4394e331e84da6481788338c1
Author: Radek Dostál <rd at radekdostal.com>
AuthorDate: Sun Dec 14 10:37:06 2025 +0100

    ath79: fix build of big images for TP RE355v1, RE450v1 & v2
    
    After merge of https://github.com/openwrt/openwrt/pull/20709 I noticed,
    that https://mirror-03.infra.openwrt.org/snapshots/targets/ath79/tiny/
    still does not contain the build for RE450.
    
    I analyzed the problem and noticed, that only builds which fits into
    original size can be build and if the image is larger, it fails with
    the following error: "WARNING: Image file .../openwrt/build_dir/
    target-mips_24kc_musl/linux-ath79_tiny/tmp/
    openwrt-ath79-tiny-tplink_re450-v1-squashfs-sysupgrade.bin is too big:
      > 7864320".
    
    This error is quite misleading as the image is smaller than 7864320. The
    reason for this error is that default tplink-safeloader has hardcoded
    factory partition structure and fails to generate any file.
    
    Rather then fixing tplink-safeloader I followed approach from commit
    ebd5e5fb5359 ("ramips: switched TP-Link RE305 v1 to new partition layout")
    and switched away from "tplink-safeloader sysupgrade".
    
    I did not include "IMAGES := sysupgrade.bin", because with tiny target it
    is still possible to locally build even factory image.
    
    Fixes commit e768731dc8e9 ("ath79: switch TP-Link RE355 v1, RE450 v1 and
    RE450 v2 to mtd-concat").
    
    Signed-off-by: Radek Dostál <rd at radekdostal.com>
    Link: https://github.com/openwrt/openwrt/pull/21158
    Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
    (cherry picked from commit bdbb4bdfa030add96abef59b43adadf1050d678d)
---
 target/linux/ath79/image/tiny-tp-link.mk | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/target/linux/ath79/image/tiny-tp-link.mk b/target/linux/ath79/image/tiny-tp-link.mk
index 7e61eb96af..7dda526008 100644
--- a/target/linux/ath79/image/tiny-tp-link.mk
+++ b/target/linux/ath79/image/tiny-tp-link.mk
@@ -9,6 +9,7 @@ define Device/tplink_rex5x-v1
   DEVICE_COMPAT_VERSION := 2.0
   DEVICE_COMPAT_MESSAGE := Partition layout has changed compared to older versions by utilizing unused flash. \
     Upgrade via sysupgrade mechanism (-F) will only work if flashed image still fits to the size of old partition (6016 KiB).
+  IMAGE/sysupgrade.bin := append-kernel | append-rootfs | pad-rootfs | check-size | append-metadata
 endef
 
 define Device/tplink_re355-v1
@@ -40,6 +41,7 @@ define Device/tplink_re450-v2
   DEVICE_COMPAT_VERSION := 2.0
   DEVICE_COMPAT_MESSAGE := Partition layout has changed compared to older versions by utilizing unused flash. \
     Upgrade via sysupgrade mechanism (-F) will only work if flashed image still fits to the size of old partition (6016 KiB).
+  IMAGE/sysupgrade.bin := append-kernel | append-rootfs | pad-rootfs | check-size | append-metadata
   TPLINK_BOARD_ID := RE450-V2
   LOADER_TYPE := elf
 endef