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ramips: mt7621: build .trx image for ASUS RT-AX53U

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Build an initramfs-factory.trx image suitable for flashing directly via
the vendor firmware WebGUI, without using TFTP or SSH.

To use:
1. Flash the initramfs-factory.trx file with the vendor firmware
   administrative interface.
2. Wait until the router restarts, login to OpenWRT via LuCI (or SSH)
   and upgrade firmware using the sysupgrade-squashfs.bin image file.

It is necessary to use TRX version 2, which has a kernel size limit of
16MB (TRX version 3 is rejected by vendor firmware). To avoid stopping
the whole build when the input file turns out larger, check in the
Build/asus-trx macro if check-size removed the input file and don't
error out in this case.

Note: It should be possible to prepare an image to flash the router in
one step, but this will be more complicated, because vendor firmware and
OpenWRT use a slightly different partition layout.

Signed-off-by: Mateusz Jończyk <mat.jonczyk@o2.pl>
Link: https://github.com/openwrt/openwrt/pull/23647
Signed-off-by: Robert Marko <robimarko@gmail.com>
This commit is contained in:
Mateusz Jończyk
2026-03-20 23:37:44 +01:00
committed by Robert Marko
parent 1480790ea9
commit 4e810fa151
2 changed files with 15 additions and 0 deletions
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target/linux/ramips/image/Makefile
+8
View File
@@ -29,6 +29,14 @@ LOADER_FLASH_START := $(ldrflashstart-y)
KERNEL_DTB = kernel-bin | append-dtb | lzma
define Build/asus-trx
# don't stop the whole build if check-size removed the input file
[ ! -e $@ ] || { \
$(STAGING_DIR_HOST)/bin/asusuimage $(wordlist 1,$(words $(1)),$(1)) -i $@ -o $@.new; \
mv $@.new $@; \
}
endef
define Build/jcg-header
$(STAGING_DIR_HOST)/bin/jcgimage -v $(1) \
$(if $(JCG_MAXSIZE), -m $$(($(call exp_units,$(JCG_MAXSIZE)))),) \
target/linux/ramips/image/mt7621.mk
+7
View File
@@ -481,6 +481,13 @@ define Device/asus_rt-ax53u
IMAGE/factory.bin := append-kernel | pad-to $$(KERNEL_SIZE) | append-ubi | \
check-size
DEVICE_PACKAGES := kmod-mt7915-firmware kmod-usb3 kmod-usb-ledtrig-usbport
ifeq ($(IB),)
ifneq ($(CONFIG_TARGET_ROOTFS_INITRAMFS),)
ARTIFACTS := initramfs-factory.trx
ARTIFACT/initramfs-factory.trx := append-image-stage initramfs-kernel.bin | \
check-size 16m | asus-trx -v 2 -n $$(DEVICE_MODEL) -b 386 -e 19999
endif
endif
endef
TARGET_DEVICES += asus_rt-ax53u