From f037a2e8bb86d0edd4a4913afd69d39b60a03062 Mon Sep 17 00:00:00 2001
From: Chukun Pan <amadeus@jmu.edu.cn>
Date: Mon, 10 Nov 2025 18:16:30 +0800
Subject: [PATCH] arm-trusted-firmware-mediatek: add MT7987 DDR4 4BG images

Add the DDR4_4BG_MODE option, which supports 4GB DDR4 RAM
for the MT7987 and 8GB DDR4 RAM for the MT7988. If this mode
is not enabled, bl2 can only recognize half the size of RAM.

Signed-off-by: Chukun Pan <amadeus@jmu.edu.cn>
Link: https://github.com/openwrt/openwrt/pull/21000
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
 .../arm-trusted-firmware-mediatek/Makefile    | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/package/boot/arm-trusted-firmware-mediatek/Makefile b/package/boot/arm-trusted-firmware-mediatek/Makefile
index f90915ed67..24fa97e5ce 100644
--- a/package/boot/arm-trusted-firmware-mediatek/Makefile
+++ b/package/boot/arm-trusted-firmware-mediatek/Makefile
@@ -30,6 +30,7 @@ define Trusted-Firmware-A/Default
   BOOT_DEVICE:=
   DDR3_FLYBY:=
   DDR3_FREQ_1866:=
+  DDR4_4BG_MODE:=
   DDR_TYPE:=
   NAND_TYPE:=
   BOARD_QFN:=
@@ -410,6 +411,14 @@ define Trusted-Firmware-A/mt7987-emmc-comb
   DRAM_USE_COMB:=1
 endef
 
+define Trusted-Firmware-A/mt7987-emmc-ddr4-4bg
+  NAME:=MediaTek MT7987 (eMMC, DDR4 4GB)
+  BOOT_DEVICE:=emmc
+  BUILD_SUBTARGET:=filogic
+  PLAT:=mt7987
+  DDR4_4BG_MODE:=1
+endef
+
 define Trusted-Firmware-A/mt7987-nor-comb
   NAME:=MediaTek MT7987 (NOR)
   BOOT_DEVICE:=nor
@@ -426,6 +435,14 @@ define Trusted-Firmware-A/mt7987-sdmmc-comb
   DRAM_USE_COMB:=1
 endef
 
+define Trusted-Firmware-A/mt7987-sdmmc-ddr4-4bg
+  NAME:=MediaTek MT7987 (SD card, DDR4 4GB)
+  BOOT_DEVICE:=sdmmc
+  BUILD_SUBTARGET:=filogic
+  PLAT:=mt7987
+  DDR4_4BG_MODE:=1
+endef
+
 define Trusted-Firmware-A/mt7987-spim-nand0-ubi-comb
   NAME:=MediaTek MT7987 (SPI-NAND via SPIM, UBI)
   BOOT_DEVICE:=spim-nand
@@ -670,8 +687,10 @@ TFA_TARGETS:= \
 	mt7986-spim-nand-ubi-ddr4 \
 	mt7986-spim-nand-4k-ddr4 \
 	mt7987-emmc-comb \
+	mt7987-emmc-ddr4-4bg \
 	mt7987-nor-comb \
 	mt7987-sdmmc-comb \
+	mt7987-sdmmc-ddr4-4bg \
 	mt7987-spim-nand0-ubi-comb \
 	mt7987-spim-nand2-ubi-comb \
 	mt7987-ram-comb \
@@ -705,6 +724,7 @@ TFA_MAKE_FLAGS += \
 	HAVE_DRAM_OBJ_FILE=yes \
 	$(if $(DDR3_FLYBY),DDR3_FLYBY=1) \
 	$(if $(DDR3_FREQ_1866),DDR3_FREQ_1866=1) \
+	$(if $(DDR4_4BG_MODE),DDR4_4BG_MODE=1) \
 	$(if $(DRAM_USE_COMB),DRAM_USE_COMB=1) \
 	$(if $(RAM_BOOT_UART_DL),RAM_BOOT_UART_DL=1) \
 	$(if $(USE_UBI),UBI=1 $(if $(findstring mt7622,$(PLAT)),OVERRIDE_UBI_START_ADDR=0x80000)) \
-- 
2.30.2