[openwrt/openwrt] airoha: an7581: add BL2 and BL31+U-Boot Artifacts for RFB board

[LEDE Commits]

ansuel pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/17cb69fe7f91f5560c793020281b236812b71489

commit 17cb69fe7f91f5560c793020281b236812b71489
Author: Christian Marangi <ansuelsmth at gmail.com>
AuthorDate: Fri Oct 24 09:49:57 2025 +0200

    airoha: an7581: add BL2 and BL31+U-Boot Artifacts for RFB board
    
    Pack the BL2 and BL31+U-Boot artifacts as Airoha AN7581 is currently
    supported in upstream U-Boot and bootloader files can be used for
    unfused boards.
    
    Signed-off-by: Christian Marangi <ansuelsmth at gmail.com>
---
 target/linux/airoha/image/an7581.mk | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/target/linux/airoha/image/an7581.mk b/target/linux/airoha/image/an7581.mk
index 8f187b812c..fcd19e413c 100644
--- a/target/linux/airoha/image/an7581.mk
+++ b/target/linux/airoha/image/an7581.mk
@@ -1,3 +1,17 @@
+define Build/an7581-emmc-bl2-bl31-uboot
+  head -c $$((0x800)) /dev/zero > $@
+  cat $(STAGING_DIR_IMAGE)/an7581_$1-bl2.fip >> $@
+  dd if=$(STAGING_DIR_IMAGE)/an7581_$1-bl31-u-boot.fip of=$@ bs=1 seek=$$((0x20000)) conv=notrunc
+endef
+
+define Build/an7581-preloader
+  cat $(STAGING_DIR_IMAGE)/an7581_$1-bl2.fip >> $@
+endef
+
+define Build/an7581-bl31-uboot
+  cat $(STAGING_DIR_IMAGE)/an7581_$1-bl31-u-boot.fip >> $@
+endef
+
 define Device/FitImageLzma
 	KERNEL_SUFFIX := -uImage.itb
 	KERNEL = kernel-bin | lzma | fit lzma $$(KDIR)/image-$$(DEVICE_DTS).dtb
@@ -13,6 +27,9 @@ define Device/airoha_an7581-evb
   DEVICE_DTS_CONFIG := config at 1
   KERNEL_LOADADDR := 0x80088000
   IMAGE/sysupgrade.bin := append-kernel | pad-to 128k | append-rootfs | pad-rootfs | append-metadata
+  ARTIFACT/preloader.bin := an7581-preloader rfb
+  ARTIFACT/bl31-uboot.fip := an7581-bl31-uboot rfb
+  ARTIFACTS := preloader.bin bl31-uboot.fip
 endef
 TARGET_DEVICES += airoha_an7581-evb
 
@@ -21,5 +38,8 @@ define Device/airoha_an7581-evb-emmc
   DEVICE_MODEL := AN7581 Evaluation Board (EMMC)
   DEVICE_DTS := an7581-evb-emmc
   DEVICE_PACKAGES := kmod-i2c-an7581
+  ARTIFACT/preloader.bin := an7581-preloader rfb
+  ARTIFACT/bl31-uboot.fip := an7581-bl31-uboot rfb
+  ARTIFACTS := preloader.bin bl31-uboot.fip
 endef
 TARGET_DEVICES += airoha_an7581-evb-emmc