ramips: improve compatibility for Youku YK-L2 and YK-L1 series

Add UIMAGE_NAME and UIMAGE_MAGIC to allow users to directly install
initramfs-kernel.bin from the stock firmware Web UI. At the same time,
this change makes it possible to boot OpenWrt with the official u-boot.

Notice:
Since the stock firmware is based on OpenWrt and the configuration
will be retained by default during the upgrade process, so we must use
initramfs-kernel.bin to do a initial installation. After the system
restarts, install sysupgrade.bin and do not retain any configuration.

Signed-off-by: Shiji Yang <[email protected]>

target/linux/ramips/dts/mt7620a_youku_yk-l1.dtsi

@@ -86,8 +86,9 @@
 			};
 
 			firmware: partition@50000 {
-				compatible = "denx,uimage";
+				compatible = "openwrt,uimage", "denx,uimage";
 				label = "firmware";
+				openwrt,ih-magic = <0x12291000>;
 				/* reg property is set based on flash size in DTS files */
 			};
 		};

target/linux/ramips/dts/mt7621_youku_yk-l2.dts

@@ -95,8 +95,9 @@
 			};
 
 			partition@50000 {
-				compatible = "denx,uimage";
+				compatible = "openwrt,uimage", "denx,uimage";
 				label = "firmware";
+				openwrt,ih-magic = <0x12291000>;
 				reg = <0x50000 0xfb0000>;
 			};
 		};

target/linux/ramips/image/mt7620.mk

@@ -1281,6 +1281,8 @@ define Device/youku_yk-l1
   DEVICE_PACKAGES := kmod-usb2 kmod-usb-ohci kmod-sdhci-mt7620 \
 	kmod-usb-ledtrig-usbport
   SUPPORTED_DEVICES += youku-yk1 youku,yk1
+  UIMAGE_MAGIC := 0x12291000
+  UIMAGE_NAME := 400000000000000000000000
 endef
 TARGET_DEVICES += youku_yk-l1
 
@@ -1291,6 +1293,8 @@ define Device/youku_yk-l1c
   DEVICE_MODEL := YK-L1c
   DEVICE_PACKAGES := kmod-usb2 kmod-usb-ohci kmod-sdhci-mt7620 \
 	kmod-usb-ledtrig-usbport
+  UIMAGE_MAGIC := 0x12291000
+  UIMAGE_NAME := 400000000000000000000000
 endef
 TARGET_DEVICES += youku_yk-l1c
 

target/linux/ramips/image/mt7621.mk

@@ -2251,6 +2251,8 @@ define Device/youku_yk-l2
   DEVICE_MODEL := YK-L2
   DEVICE_PACKAGES := kmod-mt7603 kmod-mt76x2 kmod-usb3 \
 	kmod-usb-ledtrig-usbport
+  UIMAGE_MAGIC := 0x12291000
+  UIMAGE_NAME := 400000000000000000003000
 endef
 TARGET_DEVICES += youku_yk-l2