[][mt7986: Add emmc image]

[Description]
Add mmc image, enable related kernel options and dts.

[Release-log]
N/A

Change-Id: I1727e72b19c67f971d9fab00f12ef6456dccc70d
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/4632363
diff --git a/target/linux/mediatek/image/gen_mt7986_emmc_img.sh b/target/linux/mediatek/image/gen_mt7986_emmc_img.sh
new file mode 100755
index 0000000..d74068c
--- /dev/null
+++ b/target/linux/mediatek/image/gen_mt7986_emmc_img.sh
@@ -0,0 +1,19 @@
+#!/bin/sh
+
+OUTPUT_FILE=$1
+KERNEL_FILE=$2
+RECOVERY_FILE=$3
+ROOTFS_FILE=$4
+
+BS=512
+
+#RECOVERY_OFFSET= kernel size / BS = 20M / 512 (blocks)
+RECOVERY_OFFSET=40960
+
+#ROOTFS_OFFSET = RECOVERY_OFFSET + (RECOVERY_SIZE / BS)
+#	       = 40960 + (10M  / 512) (blocks)
+ROOTFS_OFFSET=61440
+dd bs="$BS" of="$OUTPUT_FILE" if="$KERNEL_FILE"
+dd bs="$BS" of="$OUTPUT_FILE" if="$RECOVERY_FILE" seek="$RECOVERY_OFFSET"
+dd bs="$BS" of="$OUTPUT_FILE" if="$ROOTFS_FILE" seek="$ROOTFS_OFFSET"
+dd if=/dev/zero of="$OUTPUT_FILE" bs=128k count=1 oflag=append conv=notrunc
diff --git a/target/linux/mediatek/image/mt7986.mk b/target/linux/mediatek/image/mt7986.mk
index 36ea2eb..1720a66 100644
--- a/target/linux/mediatek/image/mt7986.mk
+++ b/target/linux/mediatek/image/mt7986.mk
@@ -25,6 +25,17 @@
 endef
 TARGET_DEVICES += mt7986a-ax6000-snand-rfb
 
+define Device/mt7986a-ax6000-emmc-rfb
+  DEVICE_VENDOR := MediaTek
+  DEVICE_MODEL := mt7986a-ax6000-emmc-rfb
+  DEVICE_DTS := mt7986a-emmc-rfb
+  DEVICE_DTS_DIR := $(DTS_DIR)/mediatek
+  DEVICE_PACKAGES := mkf2fs e2fsprogs kmod-fs-vfat kmod-nls-cp437 kmod-nls-iso8859-1 kmod-mmc
+  IMAGES := sysupgrade-emmc.bin.gz
+  IMAGE/sysupgrade.bin.gz := sysupgrade-emmc | gzip | append-metadata
+endef
+TARGET_DEVICES += mt7986a-ax6000-emmc-rfb
+
 define Device/mt7986a-ax6000-2500wan-nor-rfb
   DEVICE_VENDOR := MediaTek
   DEVICE_MODEL := mt7986a-ax6000-2500wan-nor-rfb