ath79: fix first reboot issue on Netgear WNDR4300 v2 and WNDR4500 v3

From the Netgear u-boot GPL code[1]. Bootloader always unconditionally
marks block 768, 1020 - 1023 as bad blocks on each boot. This may lead
to conflicts with the OpenWrt nand driver since these blocks may be good
blocks. In this case, U-boot will override the oob of these blocks so
that break the ubi volume. The system will be damaged after first reboot.
To avoid this issue, manually skip these blocks by using "mtd-concat".

[1] https://www.downloads.netgear.com/files/GPL/EX7300v2series-V1.0.0.146_gpl_src.tar.bz2.zip

Fixes: https://github.com/openwrt/openwrt/issues/8878
Tested-by: Yousaf <[email protected]>
Signed-off-by: Shiji Yang <[email protected]>

target/linux/ath79/dts/qca9563_netgear_wndr.dtsi

@@ -90,6 +90,22 @@
 			linux,default-trigger = "phy1tpt";
 		};
 	};
+
+	ubi-concat {
+		compatible = "mtd-concat";
+		devices = <&ubiconcat0 &ubiconcat1>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "ubi";
+				reg = <0x0 0x0>;
+			};
+		};
+	};
 };
 
 &spi {
@@ -165,10 +181,20 @@
 				reg = <0x0 0x400000>;
 			};
 
-			partition@400000 {
-				label = "ubi";
-				reg = <0x400000 0x7c00000>;
+			ubiconcat0: partition@400000 {
+				label = "ubiconcat0";
+				reg = <0x400000 0x5c00000>;
+			};
+
+			ubiconcat1: partition@6020000 {
+				label = "ubiconcat1";
+				reg = <0x6020000 0x1f60000>;
 			};
+			/*
+			 * U-boot always unconditionally marks block 768, 1020 - 1023 as
+			 * bad blocks on each boot. To avoid conflicts with the nand
+			 * driver, manually skip them.
+			 */
 		};
 	};
 };

target/linux/ath79/image/nand.mk

@@ -373,6 +373,9 @@ TARGET_DEVICES += netgear_wndr4300tn
 
 define Device/netgear_wndr4300-v2
   SOC := qca9563
+  DEVICE_COMPAT_VERSION := 1.1
+  DEVICE_COMPAT_MESSAGE := Partition table has been changed to fix the \
+	first reboot issue. Please reflash factory image with nmrp or tftp.
   DEVICE_MODEL := WNDR4300
   DEVICE_VARIANT := v2
   UIMAGE_MAGIC := 0x27051956
@@ -384,6 +387,9 @@ TARGET_DEVICES += netgear_wndr4300-v2
 
 define Device/netgear_wndr4500-v3
   SOC := qca9563
+  DEVICE_COMPAT_VERSION := 1.1
+  DEVICE_COMPAT_MESSAGE := Partition table has been changed to fix the \
+	first reboot issue. Please reflash factory image with nmrp or tftp.
   DEVICE_MODEL := WNDR4500
   DEVICE_VARIANT := v3
   UIMAGE_MAGIC := 0x27051956

target/linux/ath79/nand/base-files/etc/board.d/05_compat-version

@@ -0,0 +1,15 @@
+. /lib/functions.sh
+. /lib/functions/uci-defaults.sh
+
+board_config_update
+
+case "$(board_name)" in
+	netgear,wndr4300-v2|\
+	netgear,wndr4500-v3)
+		ucidef_set_compat_version "1.1"
+		;;
+esac
+
+board_config_flush
+
+exit 0