lantiq: grow kernel partition Zyxel P-2812HNU-F1

Change partition table in dts file.
Change DEVICE_COMPAT_VERSION
Enable automatic build.

To take advantage of the bigger kernel partition,
the uboot environment has to be changed:
setenv nboot 'nand read 0x81000000 0x60000 0x500000; bootm 0x81000000'
setenv bootcmd 'run nboot'
saveenv

Of course you need a u-boot capable of handling this.
The u-boot discussed in this forum thread:
https://forum.openwrt.org/t/zyxel-p2812hnu-f1-u-boot/100281
should be able to handle kernels up to an uncompressed size of 16MiB.

Signed-off-by: Isaac de Wolff <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/17209
Link: https://github.com/openwrt/openwrt/pull/17300
Signed-off-by: Hauke Mehrtens <[email protected]>
(cherry picked from commit 0d21cc8a92ea3b2cc94efefd60eae968a4296543)

target/linux/lantiq/files/arch/mips/boot/dts/lantiq/vr9_zyxel_p-2812hnu-f1.dts

@@ -47,11 +47,11 @@
 			};
 			partition@60000 {
 				label = "kernel";
-				reg = <0x60000 0x300000>;
+				reg = <0x60000 0x500000>;
 			};
-			partition@360000 {
+			partition@560000 {
 				label = "ubi";
-				reg = <0x360000 0x7ca0000>;
+				reg = <0x560000 0x7aa0000>;
 			};
 		};
 	};

target/linux/lantiq/image/vr9.mk

@@ -331,16 +331,17 @@ endef
 TARGET_DEVICES += lantiq_easy80920-nor
 
 define Device/zyxel_p-2812hnu-f1
-  $(Device/dsa-migration)
   $(Device/NAND)
+  DEVICE_COMPAT_VERSION := 2.0
+  DEVICE_COMPAT_MESSAGE := kernel and ubi partitions had to be resized. \
+  Upgrade manually using initramfs, and change u-boot environment to load 5MiB for uImage.
   DEVICE_VENDOR := Zyxel
   DEVICE_MODEL := P-2812HNU
   DEVICE_VARIANT := F1
   BOARD_NAME := P2812HNUF1
   DEVICE_PACKAGES := kmod-rt2800-pci wpad-basic-mbedtls kmod-usb-dwc2 kmod-usb-ledtrig-usbport
-  KERNEL_SIZE := 3072k
+  KERNEL_SIZE := 5120k
   SUPPORTED_DEVICES += P2812HNUF1
-  DEFAULT := n
 endef
 TARGET_DEVICES += zyxel_p-2812hnu-f1
 

target/linux/lantiq/xrx200/base-files/etc/board.d/05_compat-version

@@ -8,6 +8,10 @@
 board_config_update
 
 case "$(board_name)" in
+	zyxel,p-2812hnu-f1)
+		ucidef_set_compat_version "2.0"
+		;;
+
 	*)
 		ucidef_set_compat_version "1.1"
 		;;