mediatek: add support for Buffalo WSR-2533DHP2

This adds support for the Buffalo WSR-2533DHP2.

The device uses the Broadcom TRX image format with a special magic. To
be able to boot the images or load them they have to be wrapped with
different headers depending how it is loaded.

There are multiple ways to install OpenWrt on this device.
Boot ramdisk from U-Boot
----------------------------
This will load the image and not write it into the flash.

1. Stop boot menu with "space" key
2. Select "System Load Linux to SDRAM via TFTP."
3. Load this image:
   openwrt-mediatek-mt7622-buffalo_wsr-2533dhp2-initramfs-kernel.bin
4. The system boots the image

Write to flash from U-Boot
-----------------------------
This will load the image over tftp and directly write it into the flash.

1. Stop boot menu with "space" key
2. Select "System Load Linux Kernel then write to Flash via TFTP."
3. Load this image:
   openwrt-mediatek-mt7622-buffalo_wsr-2533dhp2-squashfs-factory-uboot.bin
4. The system writes this image into the flash and boots into it.

Write to flash from Web UI
-----------------------------
This will load the image over over the Web UI and write it into the flash

1. Open the Web UI
2. Go to "管理" -> "ファームウェア更新"
3. Select "ローカルファイル指定" and click "更新実行"
4. Load this image:
   openwrt-mediatek-mt7622-buffalo_wsr-2533dhp2-squashfs-factory.bin
5. The system writes this image into the flash and boots into it.

Specifications
-------------------
* SoC:       MT7622 (4x4 2.4 GHz Wifi)
* Wifi:      MT7615 (4x4 5 GHz Wifi)
* Flash:     Winbond W29N01HZ 128MB SLC NAND
* RAM        256MB
* Ethernet:  Realtek RTL8367S (5 x 1GBit/s, SoC via 2.5GBit/s)

Co-Developed-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

7 files changed, 560 insertions, 0 deletions

diff --git a/target/linux/mediatek/dts/mt7622-buffalo-wsr-2533dhp2.dts b/target/linux/mediatek/dts/mt7622-buffalo-wsr-2533dhp2.dts
new file mode 100644
index 0000000000..397be1445b
--- /dev/null
+++ b/target/linux/mediatek/dts/mt7622-buffalo-wsr-2533dhp2.dts
@@ -0,0 +1,340 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/dts-v1/;
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/gpio/gpio.h>
+
+#include "mt7622.dtsi"
+#include "mt6380.dtsi"
+
+/ {
+	model = "Buffalo WSR-2533DHP2";
+	compatible = "buffalo,wsr-2533dhp2", "mediatek,mt7622";
+
+	aliases {
+		serial0 = &uart0;
+		led-boot = &power_green;
+		led-failsafe = &power_amber;
+		led-running = &power_green;
+		led-upgrade = &power_green;
+	};
+
+	chosen {
+		bootargs = "earlycon=uart8250,mmio32,0x11002000 console=ttyS0,115200n8 swiotlb=512";
+	};
+
+	memory {
+		reg = <0 0x40000000 0 0x0F000000>;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		wireless_amber {
+			label = "amber:wireless";
+			gpios = <&pio 2 GPIO_ACTIVE_HIGH>;
+		};
+
+		power_amber: power_amber {
+			label = "amber:power";
+			gpios = <&pio 3 GPIO_ACTIVE_LOW>;
+		};
+
+		power_green: power_green {
+			label = "green:power";
+			gpios = <&pio 4 GPIO_ACTIVE_LOW>;
+			default-state = "on";
+		};
+
+		wireless_green {
+			label = "green:wireless";
+			gpios = <&pio 15 GPIO_ACTIVE_HIGH>;
+		};
+
+		internet {
+			label = "green:internet";
+			gpios = <&pio 19 GPIO_ACTIVE_HIGH>;
+		};
+
+		router {
+			label = "green:router";
+			gpios = <&pio 20 GPIO_ACTIVE_HIGH>;
+		};
+	};
+
+	keys {
+		compatible = "gpio-keys";
+		poll-interval = <100>;
+
+		reset {
+			label = "reset";
+			gpios = <&pio 0 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+
+		/* GPIO 1 and 16 are a tri-state switch button with
+		 * ROUTER / AP / WB.
+		 */
+		router {
+			label = "router";
+			gpios = <&pio 1 GPIO_ACTIVE_LOW>;
+			linux,code = <BTN_0>;
+			linux,input-type = <EV_SW>;
+		};
+
+		bridge {
+			label = "wb";
+			gpios = <&pio 16 GPIO_ACTIVE_LOW>;
+			linux,code = <BTN_1>;
+			linux,input-type = <EV_SW>;
+		};
+
+		/* GPIO 18 is a switch button with AUTO / MANUAL. */
+		manual {
+			label = "manual";
+			gpios = <&pio 18 GPIO_ACTIVE_LOW>;
+			linux,code = <BTN_2>;
+			linux,input-type = <EV_SW>;
+		};
+
+		wps {
+			label = "wps";
+			gpios = <&pio 102 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_WPS_BUTTON>;
+		};
+	};
+
+	rtkgsw: rtkgsw@0 {
+		compatible = "mediatek,rtk-gsw";
+		mediatek,ethsys = <&ethsys>;
+		mediatek,mdio = <&mdio>;
+		mediatek,reset-pin = <&pio 54 GPIO_ACTIVE_HIGH>;
+	};
+};
+
+&cpu0 {
+	proc-supply = <&mt6380_vcpu_reg>;
+	sram-supply = <&mt6380_vm_reg>;
+};
+
+&cpu1 {
+	proc-supply = <&mt6380_vcpu_reg>;
+	sram-supply = <&mt6380_vm_reg>;
+};
+
+&pcie0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pcie0_pins>;
+	status = "okay";
+};
+
+&slot0 {
+	status = "okay";
+
+	wifi@0,0 {
+		compatible = "mediatek,mt76";
+		reg = <0x0000 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x5000>;
+		ieee80211-freq-limit = <5000000 6000000>;
+	};
+};
+
+&pio {
+	eth_pins: eth-pins {
+		mux {
+			function = "eth";
+			groups = "mdc_mdio", "rgmii_via_gmac2";
+		};
+	};
+
+	/* Parallel nand is shared pin with eMMC */
+	parallel_nand_pins: parallel-nand-pins {
+		mux {
+			function = "flash";
+			groups = "par_nand";
+		};
+
+		conf-cmd-dat {
+			pins = "NCEB", "NWEB", "NREB",
+				  "NDL4", "NDL5", "NDL6",
+				  "NDL7", "NRB", "NCLE",
+				  "NALE", "NDL0", "NDL1",
+				  "NDL2", "NDL3";
+			input-enable;
+			drive-strength = <8>;
+			bias-pull-up;
+		};
+	};
+
+	pcie0_pins: pcie0-pins {
+		mux {
+			function = "pcie";
+			groups = "pcie0_pad_perst",
+				 "pcie0_1_waken",
+				 "pcie0_1_clkreq";
+		};
+	};
+
+	pmic_bus_pins: pmic-bus-pins {
+		mux {
+			function = "pmic";
+			groups = "pmic_bus";
+		};
+	};
+
+	pwm7_pins: pwm1-2-pins {
+		mux {
+			function = "pwm";
+			groups = "pwm_ch7_2";
+		};
+	};
+
+	uart0_pins: uart0-pins {
+		mux {
+			function = "uart";
+			groups = "uart0_0_tx_rx" ;
+		};
+	};
+
+	watchdog_pins: watchdog-pins {
+		mux {
+			function = "watchdog";
+			groups = "watchdog";
+		};
+	};
+};
+
+&bch {
+	status = "okay";
+};
+
+&eth {
+	pinctrl-names = "default";
+	pinctrl-0 = <&eth_pins>;
+	status = "okay";
+
+	gmac0: mac@0 {
+		compatible = "mediatek,eth-mac";
+		reg = <0>;
+
+		phy-connection-type = "2500base-x";
+
+		mtd-mac-address = <&factory 0x4>;
+		mtd-mac-address-increment = <(-1)>;
+
+		fixed-link {
+			speed = <2500>;
+			full-duplex;
+			pause;
+		};
+	};
+
+	mdio: mdio-bus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+	};
+};
+
+&nandc {
+	pinctrl-names = "default";
+	pinctrl-0 = <&parallel_nand_pins>;
+	status = "okay";
+
+	nand@0 {
+		reg = <0>;
+		nand-ecc-mode = "hw";
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "Preloader";
+				reg = <0x0 0x80000>;
+				read-only;
+			};
+
+			partition@80000 {
+				label = "ATF";
+				reg = <0x80000 0x40000>;
+				read-only;
+			};
+
+			partition@c0000 {
+				label = "Bootloader";
+				reg = <0xc0000 0x80000>;
+				read-only;
+			};
+
+			partition@140000 {
+				label = "Config";
+				reg = <0x140000 0x80000>;
+				read-only;
+			};
+
+			factory: partition@1c0000 {
+				label = "factory";
+				reg = <0x1c0000 0x40000>;
+				read-only;
+			};
+
+			partition@200000 {
+				compatible = "brcm,trx";
+				trx-magic = <0x32504844>;
+				label = "firmware";
+				reg = <0x200000 0x3a00000>;
+			};
+
+			partition@3C00000 {
+				label = "Kernel2";
+				reg = <0x3c00000 0x3a00000>;
+			};
+
+			partition@7600000 {
+				label = "glbcfg";
+				reg = <0x7600000 0x200000>;
+				read-only;
+			};
+
+			partition@7800000 {
+				label = "board_data";
+				reg = <0x7800000 0x200000>;
+				read-only;
+			};
+		};
+	};
+};
+
+&pwm {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pwm7_pins>;
+	status = "okay";
+};
+
+&pwrap {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pmic_bus_pins>;
+	status = "okay";
+};
+
+&uart0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart0_pins>;
+	status = "okay";
+};
+
+&watchdog {
+	pinctrl-names = "default";
+	pinctrl-0 = <&watchdog_pins>;
+	status = "okay";
+};
+
+&wmac {
+	status = "okay";
+
+	mediatek,mtd-eeprom = <&factory 0x0>;
+};
+
+&rtc {
+	status = "disabled";
+};
diff --git a/target/linux/mediatek/image/mt7622.mk b/target/linux/mediatek/image/mt7622.mk
index 6824d4a8ee..e31baf2275 100644
--- a/target/linux/mediatek/image/mt7622.mk
+++ b/target/linux/mediatek/image/mt7622.mk
@@ -6,6 +6,28 @@ else
   KERNEL_LOADADDR := 0x44000000
 endif
 
+define Image/Prepare
+	# For UBI we want only one extra block
+	rm -f $(KDIR)/ubi_mark
+	echo -ne '\xde\xad\xc0\xde' > $(KDIR)/ubi_mark
+endef
+
+define Build/buffalo-kernel-trx
+	$(eval magic=$(word 1,$(1)))
+	$(eval dummy=$(word 2,$(1)))
+	$(eval kern_size=$(if $(KERNEL_SIZE),$(KERNEL_SIZE),0x400000))
+
+	$(if $(dummy),touch $(dummy))
+	$(STAGING_DIR_HOST)/bin/otrx create $@.new \
+		$(if $(magic),-M $(magic),) \
+		-f $@ \
+		$(if $(dummy),\
+			-a 0x20000 \
+			-b $$(( $(subst k, * 1024,$(kern_size)) )) \
+			-f $(dummy),)
+	mv $@.new $@
+endef
+
 define Build/bl2
 	cat $(STAGING_DIR_IMAGE)/mt7622-$1-bl2.img >> $@
 endef
@@ -34,6 +56,19 @@ define Build/mt7622-gpt
 	rm $@.tmp
 endef
 
+define Build/trx-nand
+	# kernel: always use 4 MiB (-28 B or TRX header) to allow upgrades even
+	#	  if it grows up between releases
+	# root: UBI with one extra block containing UBI mark to trigger erasing
+	#	rest of partition
+	$(STAGING_DIR_HOST)/bin/otrx create $@.new \
+		-M 0x32504844 \
+		-f $(IMAGE_KERNEL) -a 0x20000 -b 0x400000 \
+		-f $@ \
+		-A $(KDIR)/ubi_mark -a 0x20000
+	mv $@.new $@
+endef
+
 define Device/bananapi_bpi-r64
   DEVICE_VENDOR := Bananapi
   DEVICE_MODEL := BPi-R64
@@ -51,6 +86,35 @@ define Device/bananapi_bpi-r64
 endef
 TARGET_DEVICES += bananapi_bpi-r64
 
+define Device/buffalo_wsr-2533dhp2
+  DEVICE_VENDOR := Buffalo
+  DEVICE_MODEL := WSR-2533DHP2
+  DEVICE_DTS := mt7622-buffalo-wsr-2533dhp2
+  DEVICE_DTS_DIR := ../dts
+  IMAGE_SIZE := 59392k
+  KERNEL_SIZE := 4096k
+  BLOCKSIZE := 128k
+  PAGESIZE := 2048
+  SUBPAGESIZE := 512
+  UBINIZE_OPTS := -E 5
+  BUFFALO_TAG_PLATFORM := MTK
+  BUFFALO_TAG_VERSION := 9.99
+  BUFFALO_TAG_MINOR := 9.99
+  IMAGES += factory.bin factory-uboot.bin
+  KERNEL_INITRAMFS := kernel-bin | lzma | \
+	fit lzma $$(KDIR)/image-$$(firstword $$(DEVICE_DTS)).dtb with-initrd | \
+	buffalo-kernel-trx
+  IMAGE/factory.bin := append-ubi | trx-nand | \
+	buffalo-enc WSR-2533DHP2 $$(BUFFALO_TAG_VERSION) -l | \
+	buffalo-tag-dhp WSR-2533DHP2 JP JP | buffalo-enc-tag -l | buffalo-dhp-image
+  IMAGE/factory-uboot.bin := append-ubi | trx-nand
+  IMAGE/sysupgrade.bin := append-kernel | \
+	buffalo-kernel-trx 0x32504844 $(KDIR)/tmp/$$(DEVICE_NAME).null | \
+	sysupgrade-tar kernel=$$$$@ | append-metadata
+  DEVICE_PACKAGES := kmod-mt7615e kmod-mt7615-firmware swconfig uboot-envtools
+endef
+TARGET_DEVICES += buffalo_wsr-2533dhp2
+
 define Device/elecom_wrc-2533gent
   DEVICE_VENDOR := Elecom
   DEVICE_MODEL := WRC-2533GENT
diff --git a/target/linux/mediatek/mt7622/base-files/etc/board.d/02_network b/target/linux/mediatek/mt7622/base-files/etc/board.d/02_network
index f537ccdb80..f1daa2fae1 100644
--- a/target/linux/mediatek/mt7622/base-files/etc/board.d/02_network
+++ b/target/linux/mediatek/mt7622/base-files/etc/board.d/02_network
@@ -14,6 +14,10 @@ mediatek_setup_interfaces()
 	mediatek,mt7622-rfb1)
 		ucidef_set_interfaces_lan_wan "lan1 lan2 lan3 lan4" wan
 		;;
+	buffalo,wsr-2533dhp2)
+		ucidef_add_switch "switch0" \
+			"0:lan" "1:lan" "2:lan" "3:lan" "4:wan" "6@eth0"
+		;;
 	ubnt,unifi-6-lr)
 		ucidef_set_interfaces_lan "eth0"
 		;;
diff --git a/target/linux/mediatek/mt7622/base-files/etc/uci-defaults/09_fix_crc b/target/linux/mediatek/mt7622/base-files/etc/uci-defaults/09_fix_crc
new file mode 100644
index 0000000000..81cb6b18b7
--- /dev/null
+++ b/target/linux/mediatek/mt7622/base-files/etc/uci-defaults/09_fix_crc
@@ -0,0 +1,10 @@
+. /lib/functions.sh
+
+kernel_size=$(sed -n 's/mtd[0-9]*: \([0-9a-f]*\).*"\(kernel\|linux\)".*/\1/p' /proc/mtd)
+
+case "$(board_name)" in
+buffalo,wsr-2533dhp2)
+	mtd -M 0x44485032 ${kernel_size:+-c 0x$kernel_size} fixtrx firmware && exit 0
+	exit 1
+	;;
+esac
diff --git a/target/linux/mediatek/mt7622/base-files/lib/upgrade/buffalo.sh b/target/linux/mediatek/mt7622/base-files/lib/upgrade/buffalo.sh
new file mode 100644
index 0000000000..844cc4ed95
--- /dev/null
+++ b/target/linux/mediatek/mt7622/base-files/lib/upgrade/buffalo.sh
@@ -0,0 +1,126 @@
+# ======== dev note ========
+# for following buffalo MT7622 devices:
+#
+# - WSR-2533DHP2 (trx magic: "DHP2")
+# - WSR-2533DHP3 (trx magic: "DHP3")
+# - WSR-3200AX4S (trx magic: "DHP3")
+#
+# sysupgrade-tar image:
+#
+# This is for normal upgrading for OpenWrt.
+# use nand_do_upgrade with CI_KERNPART="firmware"
+#
+# - if the size of new kernel is not equal with the current kernel's
+#   -> block upgrade and print a message about using TRX + UBI
+#      formatted image
+#   (should be flashed the new ubi contains rootfs + rootfs_data
+#   with the offset (=new padded kernel's end) if this case? But
+#   it maybe too hard for writing scripts...)
+#
+# TRX + UBI formatted image:
+#
+# This is for upgrading if the new kernel is larger than the
+# current kernel.
+#
+# ex:
+#   - stock firmware is installed in the flash and booted with
+#     OpenWrt initramfs image
+#   - kernel partition is increased from 4MiB in OpenWrt in the
+#     future
+#
+# packing TRX + UBI formatted image by tar is needed for image validation
+# with the metadata in the future?
+# ====== dev note end ======
+#
+# The mtd partitions "firmware" and "Kernel2" on NAND flash are os-image
+# partitions. These partitions are called as "Image1/Image2" in U-Boot
+# on WSR-2533DHP2, and they are checked conditions when booting.
+# "Image1" is always used for booting.
+#
+# == U-Boot Behaviors ==
+# - "Image1"/"Image2" images are good, images are different or
+#   "Image2" image is broken
+#   -> writes os-image to "Image2" from "Image1"
+#
+# - "Image1" image is broken
+#   -> writes os-image to "Image1" from "Image2"
+#
+# - "Image1"/"Image2" images are broken
+#   -> fall to U-Boot command line
+
+buffalo_check_image() {
+	local board="$1"
+	local boardname="$(echo $board | tr ',' '_')"
+	local magic="$2"
+	local fw_image="$3"
+
+	# return error state if TRX + UBI formatted image specified
+	# to notify about configurations
+	if [ "$magic" = "44485032" -o "$magic" = "44485033" ]; then
+		echo "Your configurations won't be saved if factory-uboot.bin image specified."
+		echo "But if you want to upgrade, please execute sysupgrade with \"-F\" option."
+		return 1
+	fi
+
+	# check if valid tar file specifed
+	if ! tar tf "$fw_image" &>/dev/null; then
+		echo "Specified file is not a tar archive: $fw_image"
+		return 1
+	fi
+
+	local control_len=$( (tar xf $fw_image sysupgrade-$boardname/CONTROL -O | wc -c) 2> /dev/null)
+
+	# check if valid sysupgrade tar archive
+	if [ "$control_len" = "0" ]; then
+		echo "Invalid sysupgrade file: $fw_image"
+		return 1
+	fi
+
+	local kern_part_len=$(grep "\"linux\"" /proc/mtd | sed "s/mtd[0-9]*:[ \t]*\([^ \t]*\).*/\1/")
+	[ -z "$kern_part_len" ] && {
+		echo "Unable to get \"linux\" partition size"
+		return 1
+	}
+	kern_part_len=$((0x$kern_part_len))
+
+	# this also checks if the sysupgrade image is for correct models
+	local kern_bin_len=$( (tar xf $fw_image sysupgrade-${boardname}/kernel -O | wc -c) 2> /dev/null)
+	if [ -z "$kern_bin_len" ]; then
+		echo "Failed to get new kernel size, is valid sysupgrade image specified for the device?"
+		return 1
+	fi
+
+	# kernel binary has a trx header (len: 28 (0x1c))
+	kern_bin_len=$((kern_bin_len - 28))
+
+	if [ "$kern_bin_len" != "$kern_part_len" ]; then
+		echo -n "The length of new kernel is invalid for current "
+		echo "\"linux\" partition, please use factory-uboot.bin image."
+		echo "\"linux\" partition: $kern_part_len, new kernel: $kern_bin_len"
+		return 1
+	fi
+}
+
+# for TRX + UBI formatted image
+buffalo_upgrade_ubinized() {
+	sync
+	echo 3 > /proc/sys/vm/drop_caches
+
+	local mtdnum="$( find_mtd_index "ubi" )"
+	# if no "ubi", don't return error for the purpose of recovery
+	# ex: recovery after accidental erasing "firmware" partition
+	if [ ! "$mtdnum" ]; then
+		echo "cannot find ubi mtd partition \"ubi\", skip detachment"
+	else
+		ubidetach -m "$mtdnum"
+	fi
+
+	# erase all data in "firmware"
+	mtd erase "${PART_NAME}"
+	# write TRX + UBI formatted image to "firmware"
+	get_image "$1" | mtd $MTD_ARGS write - "${PART_NAME:-firmware}"
+	if [ $? -ne 0 ]; then
+		echo "Failed to write the specified image."
+		exit 1
+	fi
+}
diff --git a/target/linux/mediatek/mt7622/base-files/lib/upgrade/platform.sh b/target/linux/mediatek/mt7622/base-files/lib/upgrade/platform.sh
index 87852881bf..97a492c7fb 100755
--- a/target/linux/mediatek/mt7622/base-files/lib/upgrade/platform.sh
+++ b/target/linux/mediatek/mt7622/base-files/lib/upgrade/platform.sh
@@ -56,6 +56,18 @@ platform_do_upgrade() {
 		get_image "$1" | dd of=/dev/$fitpart
 		echo $rootdev > /tmp/sysupgrade.rootdev
 		;;
+	buffalo,wsr-2533dhp2)
+		local magic="$(get_magic_long "$1")"
+
+		# use "mtd write" if the magic is "DHP2 (0x44485032)"
+		# or "DHP3 (0x44485033)"
+		if [ "$magic" = "44485032" -o "$magic" = "44485033" ]; then
+			buffalo_upgrade_ubinized "$1"
+		else
+			CI_KERNPART="firmware"
+			nand_do_upgrade "$1"
+		fi
+		;;
 	linksys,e8450-ubi|\
 	mediatek,mt7622,ubi)
 		CI_KERNPART="fit"
@@ -84,6 +96,9 @@ platform_check_image() {
 	[ "$#" -gt 1 ] && return 1
 
 	case "$board" in
+	buffalo,wsr-2533dhp2)
+		buffalo_check_image "$board" "$magic" "$1" || return 1
+		;;
 	*)
 		[ "$magic" != "d00dfeed" ] && {
 			echo "Invalid image type."
diff --git a/target/linux/mediatek/mt7622/config-5.10 b/target/linux/mediatek/mt7622/config-5.10
index 5d80056365..b899d9dbbb 100644
--- a/target/linux/mediatek/mt7622/config-5.10
+++ b/target/linux/mediatek/mt7622/config-5.10
@@ -247,6 +247,7 @@ CONFIG_MTD_NAND_MTK_BMT=y
 CONFIG_MTD_RAW_NAND=y
 CONFIG_MTD_SPI_NAND=y
 CONFIG_MTD_SPI_NOR=y
+CONFIG_MTD_PARSER_TRX=y
 CONFIG_MTD_SPLIT_FIRMWARE=y
 CONFIG_MTD_SPLIT_FIT_FW=y
 CONFIG_MTD_UBI=y