From 905338ad609467e1117635a49c5f0c002f9ae237 Mon Sep 17 00:00:00 2001
From: Robert Marko <robimarko@gmail.com>
Date: Wed, 26 Jun 2024 18:52:29 +0200
Subject: [PATCH] image: add recipe for legacy multiple images

Asus RT-AX89X has modded U-Boot that boots FIT images fine when manually
using bootm command, however once the image is flashed and device boots via
the default bootcmd it only supports booting via legacy images.

More precisely, it requires the "multi" image format with:
1. kernel
2. ramdisk
3. DTB

So, lets add a recipe based on the existing uImage one.

Link: https://github.com/openwrt/openwrt/pull/15840
Signed-off-by: Robert Marko <robimarko@gmail.com>
---
 include/image-commands.mk | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/include/image-commands.mk b/include/image-commands.mk
index 04213a3be8..cb899a2f30 100644
--- a/include/image-commands.mk
+++ b/include/image-commands.mk
@@ -701,6 +701,23 @@ define Build/uImage
 	mv $@.new $@
 endef
 
+define Build/multiImage
+	$(if $(UIMAGE_TIME),SOURCE_DATE_EPOCH="$(UIMAGE_TIME)") \
+	mkimage \
+		-A $(LINUX_KARCH) \
+		-O linux \
+		-T multi \
+		-C $(word 1,$(1)) \
+		-a $(KERNEL_LOADADDR) \
+		-e $(if $(KERNEL_ENTRY),$(KERNEL_ENTRY),$(KERNEL_LOADADDR)) \
+		-n '$(if $(UIMAGE_NAME),$(UIMAGE_NAME),$(call toupper,$(LINUX_KARCH)) $(VERSION_DIST) Linux-$(LINUX_VERSION))' \
+		$(if $(UIMAGE_MAGIC),-M $(UIMAGE_MAGIC)) \
+		-d $@:$(word 2,$(1)):$(word 3,$(1)) \
+		$(wordlist 4,$(words $(1)),$(1)) \
+		$@.new
+	mv $@.new $@
+endef
+
 define Build/xor-image
 	$(STAGING_DIR_HOST)/bin/xorimage -i $@ -o $@.xor $(1)
 	mv $@.xor $@