[source] ar71xx: add AVM FRITZ!WLAN Repeater 300E support

LEDE Commits lede-commits at lists.infradead.org
Sat Jun 24 13:38:03 PDT 2017


mkresin pushed a commit to source.git, branch master:
https://git.lede-project.org/e7cd6f5d66b827e31cfa7e7bc019ac1b86aac770

commit e7cd6f5d66b827e31cfa7e7bc019ac1b86aac770
Author: Mathias Kresin <dev at kresin.me>
AuthorDate: Fri Dec 30 11:53:21 2016 +0100

    ar71xx: add AVM FRITZ!WLAN Repeater 300E support
    
    Specifications:
    * SoC: AR7242 (Virian 400MHz)
    * RAM: 64 MB DDR (W9751G6JB-25)
    * Flash: 16MB SPI flash (S25FL129PIF)
    * WiFi: AR9382 (2.4/5GHz) + 2x SE2595L
    * LAN: 1x1000M (PEF7071V)
    
    To install LEDE via EVA bootloader, a FTP connection need to be
    established to 192.168.178.1 within the first seconds after power on:
    
      ftp> quote USER adam2
      ftp> quote PASS adam2
      ftp> binary
      ftp> debug
      ftp> passive
      ftp> quote MEDIA FLSH
      ftp> put lede-ar71xx-generic-fritz300e-squashfs-sysupgrade.bin mtd1
    
    Signed-off-by: Mathias Kresin <dev at kresin.me>
---
 include/image-commands.mk                          |  10 ++
 target/linux/ar71xx/base-files/etc/board.d/01_leds |  10 ++
 .../linux/ar71xx/base-files/etc/board.d/02_network |   4 +
 target/linux/ar71xx/base-files/etc/diag.sh         |   1 +
 .../etc/hotplug.d/firmware/10-ath9k-eeprom         |  21 ++++
 target/linux/ar71xx/base-files/lib/ar71xx.sh       |   3 +
 .../ar71xx/base-files/lib/upgrade/platform.sh      |   1 +
 target/linux/ar71xx/config-4.4                     |   3 +
 .../ar71xx/files/arch/mips/ath79/Kconfig.openwrt   |   9 ++
 target/linux/ar71xx/files/arch/mips/ath79/Makefile |   1 +
 .../ar71xx/files/arch/mips/ath79/mach-fritz300e.c  | 132 +++++++++++++++++++++
 .../linux/ar71xx/files/arch/mips/ath79/machtypes.h |   1 +
 target/linux/ar71xx/image/generic.mk               |  13 ++
 target/linux/ar71xx/mikrotik/config-default        |   3 +
 target/linux/ar71xx/nand/config-default            |   3 +
 15 files changed, 215 insertions(+)

diff --git a/include/image-commands.mk b/include/image-commands.mk
index 093b93d..8607c85 100644
--- a/include/image-commands.mk
+++ b/include/image-commands.mk
@@ -67,6 +67,16 @@ define Build/netgear-dni
 	mv $@.new $@
 endef
 
+define Build/append-squashfs-fakeroot-be
+	rm -rf $@.fakefs $@.fakesquashfs
+	mkdir $@.fakefs
+	$(STAGING_DIR_HOST)/bin/mksquashfs-lzma \
+		$@.fakefs $@.fakesquashfs \
+		-noappend -root-owned -be -nopad -b 65536 \
+		$(if $(SOURCE_DATE_EPOCH),-fixed-time $(SOURCE_DATE_EPOCH))
+	cat $@.fakesquashfs >> $@
+endef
+
 # append a fake/empty rootfs uImage header, to fool the bootloaders
 # rootfs integrity check
 define Build/append-uImage-fakeroot-hdr
diff --git a/target/linux/ar71xx/base-files/etc/board.d/01_leds b/target/linux/ar71xx/base-files/etc/board.d/01_leds
index 87f99ea..d80efef 100755
--- a/target/linux/ar71xx/base-files/etc/board.d/01_leds
+++ b/target/linux/ar71xx/base-files/etc/board.d/01_leds
@@ -242,6 +242,16 @@ ens202ext)
 f9k1115v2)
 	ucidef_set_led_usbdev "usb2" "USB2" "belkin:green:usb2" "1-1"
 	;;
+fritz300e)
+	ucidef_set_led_netdev "lan" "LAN" "$board:green:lan" "eth0"
+	ucidef_set_led_wlan "wlan" "WLAN" "$board:green:wlan" "phy0tpt"
+	ucidef_set_rssimon "wlan0" "200000" "1"
+	ucidef_set_led_rssi "rssilow" "RSSILOW" "$board:green:rssi0" "wlan0" "1" "100"
+	ucidef_set_led_rssi "rssimediumlow" "RSSIMEDIUMLOW" "$board:green:rssi1" "wlan0" "20" "100"
+	ucidef_set_led_rssi "rssimedium" "RSSIMEDIUM" "$board:green:rssi2" "wlan0" "40" "100"
+	ucidef_set_led_rssi "rssimediumhigh" "RSSIMEDIUMHIGH" "$board:green:rssi3" "wlan0" "60" "100"
+	ucidef_set_led_rssi "rssihigh" "RSSIHIGH" "$board:green:rssi4" "wlan0" "80" "100"
+	;;
 rb-750)
 	ucidef_set_led_default "act" "act" "rb750:green:act" "1"
 	ucidef_set_led_netdev "port1" "port1" "rb750:green:port1" "eth1"
diff --git a/target/linux/ar71xx/base-files/etc/board.d/02_network b/target/linux/ar71xx/base-files/etc/board.d/02_network
index 80355d6..9ff6ddd 100755
--- a/target/linux/ar71xx/base-files/etc/board.d/02_network
+++ b/target/linux/ar71xx/base-files/etc/board.d/02_network
@@ -75,6 +75,7 @@ ar71xx_setup_interfaces()
 	eap300v2|\
 	eap7660d|\
 	el-mini|\
+	fritz300e|\
 	hiveap-121|\
 	loco-m-xw|\
 	mr12|\
@@ -518,6 +519,9 @@ ar71xx_setup_macs()
 		lan_mac=$(mtd_get_mac_binary caldata 0)
 		wan_mac=$(mtd_get_mac_binary caldata 6)
 		;;
+	fritz300e)
+		lan_mac=$(fritz_tffs -n maca -i $(find_mtd_part "tffs (1)"))
+		;;
 	tl-wr1043nd-v4)
 		wan_mac=$(mtd_get_mac_binary config 0x1017c)
 		;;
diff --git a/target/linux/ar71xx/base-files/etc/diag.sh b/target/linux/ar71xx/base-files/etc/diag.sh
index dce5d8e..936a114 100644
--- a/target/linux/ar71xx/base-files/etc/diag.sh
+++ b/target/linux/ar71xx/base-files/etc/diag.sh
@@ -54,6 +54,7 @@ get_status_led() {
 	archer-c25-v1|\
 	archer-c59-v1|\
 	archer-c60-v1|\
+	fritz300e|\
 	mr12|\
 	mr16|\
 	nbg6616|\
diff --git a/target/linux/ar71xx/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom b/target/linux/ar71xx/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
index 4db1b14..b4d7817 100644
--- a/target/linux/ar71xx/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
+++ b/target/linux/ar71xx/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
@@ -40,6 +40,24 @@ ath9k_ubi_eeprom_extract() {
 		ath9k_eeprom_die "failed to extract from $ubi"
 }
 
+ath9k_eeprom_extract_reverse() {
+	local part=$1
+	local offset=$2
+	local count=$3
+	local mtd
+	local reversed
+	local caldata
+
+	mtd=$(find_mtd_chardev "$part")
+	reversed=$(hexdump -v -s $offset -n $count -e '/1 "%02x "' $mtd)
+
+	for byte in $reversed; do
+		caldata="\x${byte}${caldata}"
+	done
+
+	printf "%b" "$caldata" > /lib/firmware/$FIRMWARE
+}
+
 ath9k_patch_firmware_mac() {
 	local mac=$1
 
@@ -99,6 +117,9 @@ case "$FIRMWARE" in
 		ath9k_eeprom_extract "art" 20480 2048
 		ath9k_patch_firmware_mac $(macaddr_add $(mtd_get_mac_binary art 0) +2)
 		;;
+	fritz300e)
+		ath9k_eeprom_extract_reverse "urloader" 5441 1088
+		;;
 	mr18)
 		. /lib/upgrade/nand.sh
 
diff --git a/target/linux/ar71xx/base-files/lib/ar71xx.sh b/target/linux/ar71xx/base-files/lib/ar71xx.sh
index a1abfa0..ecc8dab 100755
--- a/target/linux/ar71xx/base-files/lib/ar71xx.sh
+++ b/target/linux/ar71xx/base-files/lib/ar71xx.sh
@@ -640,6 +640,9 @@ ar71xx_board_detect() {
 	*"ESR900")
 		name="esr900"
 		;;
+	*"FRITZ!WLAN Repeater 300E")
+		name="fritz300e"
+		;;
 	*"GL AR150")
 		name="gl-ar150"
 		;;
diff --git a/target/linux/ar71xx/base-files/lib/upgrade/platform.sh b/target/linux/ar71xx/base-files/lib/upgrade/platform.sh
index 4ee4671..60e41c8 100755
--- a/target/linux/ar71xx/base-files/lib/upgrade/platform.sh
+++ b/target/linux/ar71xx/base-files/lib/upgrade/platform.sh
@@ -647,6 +647,7 @@ platform_check_image() {
 		return 0;
 		;;
 	# these boards use metadata images
+	fritz300e|\
 	rb-750-r2|\
 	rb-750up-r2|\
 	rb-941-2nd|\
diff --git a/target/linux/ar71xx/config-4.4 b/target/linux/ar71xx/config-4.4
index 6ac3a9e..8a63359 100644
--- a/target/linux/ar71xx/config-4.4
+++ b/target/linux/ar71xx/config-4.4
@@ -107,6 +107,7 @@ CONFIG_ATH79_MACH_ESR1750=y
 CONFIG_ATH79_MACH_ESR900=y
 CONFIG_ATH79_MACH_EW_DORIN=y
 CONFIG_ATH79_MACH_F9K1115V2=y
+CONFIG_ATH79_MACH_FRITZ300E=y
 CONFIG_ATH79_MACH_GL_AR150=y
 CONFIG_ATH79_MACH_GL_AR300=y
 CONFIG_ATH79_MACH_GL_AR300M=y
@@ -350,6 +351,7 @@ CONFIG_IRQ_DOMAIN=y
 CONFIG_IRQ_FORCED_THREADING=y
 CONFIG_IRQ_MIPS_CPU=y
 CONFIG_IRQ_WORK=y
+CONFIG_LANTIQ_PHY=y
 CONFIG_LEDS_GPIO=y
 CONFIG_LEDS_NU801=y
 # CONFIG_LEDS_WNDR3700_USB is not set
@@ -386,6 +388,7 @@ CONFIG_MTD_PHYSMAP=y
 CONFIG_MTD_REDBOOT_DIRECTORY_BLOCK=-2
 CONFIG_MTD_REDBOOT_PARTS=y
 CONFIG_MTD_SPI_NOR=y
+CONFIG_MTD_SPLIT_EVA_FW=y
 CONFIG_MTD_SPLIT_FIRMWARE=y
 CONFIG_MTD_SPLIT_LZMA_FW=y
 CONFIG_MTD_SPLIT_SEAMA_FW=y
diff --git a/target/linux/ar71xx/files/arch/mips/ath79/Kconfig.openwrt b/target/linux/ar71xx/files/arch/mips/ath79/Kconfig.openwrt
index 6182a6f..0df5a88 100644
--- a/target/linux/ar71xx/files/arch/mips/ath79/Kconfig.openwrt
+++ b/target/linux/ar71xx/files/arch/mips/ath79/Kconfig.openwrt
@@ -2061,3 +2061,12 @@ config ATH79_MACH_TL_WPA8630
 	select ATH79_DEV_LEDS_GPIO
 	select ATH79_DEV_M25P80
 	select ATH79_DEV_WMAC
+
+config ATH79_MACH_FRITZ300E
+	bool "AVM FRITZ!WLAN Repeater 300E support"
+	select SOC_AR724X
+	select ATH79_DEV_AP9X_PCI if PCI
+	select ATH79_DEV_ETH
+	select ATH79_DEV_GPIO_BUTTONS
+	select ATH79_DEV_LEDS_GPIO
+	select ATH79_DEV_M25P80
diff --git a/target/linux/ar71xx/files/arch/mips/ath79/Makefile b/target/linux/ar71xx/files/arch/mips/ath79/Makefile
index 5c22faf..5a848d0 100644
--- a/target/linux/ar71xx/files/arch/mips/ath79/Makefile
+++ b/target/linux/ar71xx/files/arch/mips/ath79/Makefile
@@ -111,6 +111,7 @@ obj-$(CONFIG_ATH79_MACH_ESR1750)		+= mach-esr1750.o
 obj-$(CONFIG_ATH79_MACH_ESR900)			+= mach-esr900.o
 obj-$(CONFIG_ATH79_MACH_EW_DORIN)		+= mach-ew-dorin.o
 obj-$(CONFIG_ATH79_MACH_F9K1115V2)		+= mach-f9k1115v2.o
+obj-$(CONFIG_ATH79_MACH_FRITZ300E)		+= mach-fritz300e.o
 obj-$(CONFIG_ATH79_MACH_GL_AR150)		+= mach-gl-ar150.o
 obj-$(CONFIG_ATH79_MACH_GL_AR300)		+= mach-gl-ar300.o
 obj-$(CONFIG_ATH79_MACH_GL_AR300M)		+= mach-gl-ar300m.o
diff --git a/target/linux/ar71xx/files/arch/mips/ath79/mach-fritz300e.c b/target/linux/ar71xx/files/arch/mips/ath79/mach-fritz300e.c
new file mode 100644
index 0000000..43af71a
--- /dev/null
+++ b/target/linux/ar71xx/files/arch/mips/ath79/mach-fritz300e.c
@@ -0,0 +1,132 @@
+/*
+ *  AVM FRITZ!WLAN Repeater 300E board support
+ *
+ *  Copyright (C) 2017 Mathias Kresin <dev at kresin.me>
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
+ */
+
+#include <linux/gpio.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+
+#include "dev-ap9x-pci.h"
+#include "dev-eth.h"
+#include "dev-gpio-buttons.h"
+#include "dev-leds-gpio.h"
+#include "dev-m25p80.h"
+#include "machtypes.h"
+
+#define FRITZ300E_KEYS_POLL_INTERVAL	 	20 /* msecs */
+#define FRITZ300E_KEYS_DEBOUNCE_INTERVAL	(3 * FRITZ300E_KEYS_POLL_INTERVAL)
+
+static struct mtd_partition fritz300e_flash_partitions[] = {
+	{
+		.name		= "urloader",
+		.offset		= 0,
+		.size		= 0x0020000,
+		.mask_flags	= MTD_WRITEABLE,
+	}, {
+		.name		= "firmware",
+		.offset		= 0x0020000,
+		.size		= 0x0ee0000,
+	}, {
+		.name		= "tffs (1)",
+		.offset		= 0x0f00000,
+		.size		= 0x0080000,
+		.mask_flags	= MTD_WRITEABLE,
+	}, {
+		.name           = "tffs (2)",
+		.offset         = 0x0f80000,
+		.size           = 0x0080000,
+		.mask_flags     = MTD_WRITEABLE,
+	}
+};
+
+static struct flash_platform_data fritz300e_flash_data = {
+	.parts		= fritz300e_flash_partitions,
+	.nr_parts	= ARRAY_SIZE(fritz300e_flash_partitions),
+};
+
+static struct gpio_led fritz300e_leds_gpio[] __initdata = {
+	{
+		.name		= "fritz300e:green:power",
+		.gpio		= 13,
+		.active_low	= 1,
+	}, {
+		.name		= "fritz300e:green:lan",
+		.gpio		= 15,
+		.active_low	= 1,
+	}, {
+		.name		= "fritz300e:green:wlan",
+		.gpio		= 16,
+		.active_low	= 1,
+	}
+};
+
+static struct gpio_led fritz300e_wmac_leds_gpio[] = {
+	{
+		.name		= "fritz300e:green:rssi0",
+		.gpio		= 10,
+		.active_low	= 1,
+	}, {
+		.name		= "fritz300e:green:rssi1",
+		.gpio		= 4,
+		.active_low	= 1,
+	}, {
+		.name		= "fritz300e:green:rssi2",
+		.gpio		= 6,
+		.active_low	= 1,
+	}, {
+		.name		= "fritz300e:green:rssi3",
+		.gpio		= 7,
+		.active_low	= 1,
+	}, {
+		.name		= "fritz300e:green:rssi4",
+		.gpio		= 5,
+		.active_low	= 1,
+	}
+};
+
+static struct gpio_keys_button fritz300e_gpio_keys[] __initdata = {
+	{
+		.desc		= "wps",
+		.type		= EV_KEY,
+		.code		= KEY_WPS_BUTTON,
+		.debounce_interval = FRITZ300E_KEYS_DEBOUNCE_INTERVAL,
+		.gpio		= 12,
+		.active_low	= 1,
+	},
+};
+
+static void __init fritz300e_setup(void)
+{
+	/* get the Lantiq PEF7071V phy out of reset */
+	gpio_request_one(11, GPIOF_OUT_INIT_HIGH, "phy reset");
+
+	ath79_register_m25p80(&fritz300e_flash_data);
+
+	ath79_register_mdio(0, ~(BIT(0)));
+
+	ath79_eth0_data.phy_if_mode = PHY_INTERFACE_MODE_RGMII;
+	ath79_eth0_data.speed = SPEED_1000;
+	ath79_eth0_data.duplex = DUPLEX_FULL;
+	ath79_eth0_data.phy_mask = BIT(0);
+
+	ath79_register_eth(0);
+
+	ath79_register_leds_gpio(-1, ARRAY_SIZE(fritz300e_leds_gpio),
+				 fritz300e_leds_gpio);
+	ath79_register_gpio_keys_polled(-1, FRITZ300E_KEYS_POLL_INTERVAL,
+					ARRAY_SIZE(fritz300e_gpio_keys),
+					fritz300e_gpio_keys);
+
+	ap9x_pci_setup_wmac_leds(0, fritz300e_wmac_leds_gpio,
+				 ARRAY_SIZE(fritz300e_wmac_leds_gpio));
+	ap91_pci_init_simple();
+}
+
+MIPS_MACHINE(ATH79_MACH_FRITZ300E, "FRITZ300E",
+	     "AVM FRITZ!WLAN Repeater 300E", fritz300e_setup);
diff --git a/target/linux/ar71xx/files/arch/mips/ath79/machtypes.h b/target/linux/ar71xx/files/arch/mips/ath79/machtypes.h
index 19d06c9..8d0dfd6 100644
--- a/target/linux/ar71xx/files/arch/mips/ath79/machtypes.h
+++ b/target/linux/ar71xx/files/arch/mips/ath79/machtypes.h
@@ -103,6 +103,7 @@ enum ath79_mach_type {
 	ATH79_MACH_EW_DORIN,			/* embedded wireless Dorin Platform */
 	ATH79_MACH_EW_DORIN_ROUTER,		/* embedded wireless Dorin Router Platform */
 	ATH79_MACH_F9K1115V2,			/* Belkin AC1750DB */
+	ATH79_MACH_FRITZ300E,			/* AVM FRITZ!WLAN Repeater 300E */
 	ATH79_MACH_GL_AR150,			/* GL-AR150 support */
 	ATH79_MACH_GL_AR300,			/* GL-AR300 */
 	ATH79_MACH_GL_AR300M,			/* GL-AR300M */
diff --git a/target/linux/ar71xx/image/generic.mk b/target/linux/ar71xx/image/generic.mk
index c293555..56dcf5c 100644
--- a/target/linux/ar71xx/image/generic.mk
+++ b/target/linux/ar71xx/image/generic.mk
@@ -878,3 +878,16 @@ define Device/zbt-we1526
   IMAGE/sysupgrade.bin := append-rootfs | pad-rootfs | pad-to $$$$(ROOTFS_SIZE) | append-kernel | check-size $$$$(IMAGE_SIZE)
 endef
 TARGET_DEVICES += zbt-we1526
+
+define Device/fritz300e
+  DEVICE_TITLE := AVM FRITZ!WLAN Repeater 300E
+  DEVICE_PACKAGES := fritz-tffs rssileds -swconfig -uboot-envtools
+  BOARDNAME := FRITZ300E
+  SUPPORTED_DEVICES := fritz300e
+  IMAGE_SIZE := 15232k
+  KERNEL := kernel-bin | patch-cmdline | lzma | eva-image
+  IMAGE/sysupgrade.bin := append-kernel | pad-to 64k | \
+	append-squashfs-fakeroot-be | pad-to 256 | \
+	append-rootfs | pad-rootfs | append-metadata | check-size $$$$(IMAGE_SIZE)
+endef
+TARGET_DEVICES += fritz300e
diff --git a/target/linux/ar71xx/mikrotik/config-default b/target/linux/ar71xx/mikrotik/config-default
index f00933b..d0c8e49 100644
--- a/target/linux/ar71xx/mikrotik/config-default
+++ b/target/linux/ar71xx/mikrotik/config-default
@@ -76,6 +76,7 @@
 # CONFIG_ATH79_MACH_GL_AR300 is not set
 # CONFIG_ATH79_MACH_GL_AR300M is not set
 # CONFIG_ATH79_MACH_GL_DOMINO is not set
+# CONFIG_ATH79_MACH_FRITZ300E is not set
 # CONFIG_ATH79_MACH_GL_INET is not set
 # CONFIG_ATH79_MACH_GL_MIFI is not set
 # CONFIG_ATH79_MACH_GS_MINIBOX_V1 is not set
@@ -215,6 +216,7 @@ CONFIG_CRC16=y
 CONFIG_CRYPTO_DEFLATE=y
 CONFIG_GPIO_74X164=y
 CONFIG_GPIO_LATCH=y
+# CONFIG_LANTIQ_PHY is not set
 CONFIG_LEDS_RB750=y
 CONFIG_LZO_DECOMPRESS=y
 # CONFIG_MTD_CFI is not set
@@ -230,6 +232,7 @@ CONFIG_MTD_NAND_RB4XX=y
 CONFIG_MTD_NAND_RB750=y
 CONFIG_MTD_NAND_RB91X=y
 # CONFIG_MTD_REDBOOT_PARTS is not set
+# CONFIG_MTD_SPLIT_EVA_FW is not set
 # CONFIG_MTD_TPLINK_PARTS is not set
 CONFIG_MTD_UBI=y
 CONFIG_MTD_UBI_BEB_LIMIT=20
diff --git a/target/linux/ar71xx/nand/config-default b/target/linux/ar71xx/nand/config-default
index 41eacbf..8420e15 100644
--- a/target/linux/ar71xx/nand/config-default
+++ b/target/linux/ar71xx/nand/config-default
@@ -70,6 +70,7 @@
 # CONFIG_ATH79_MACH_ESR900 is not set
 # CONFIG_ATH79_MACH_EW_DORIN is not set
 # CONFIG_ATH79_MACH_F9K1115V2 is not set
+# CONFIG_ATH79_MACH_FRITZ300E is not set
 # CONFIG_ATH79_MACH_GL_AR150 is not set
 # CONFIG_ATH79_MACH_GL_AR300 is not set
 # CONFIG_ATH79_MACH_GL_AR300M is not set
@@ -197,6 +198,7 @@ CONFIG_ATH79_MACH_RAMBUTAN=y
 # CONFIG_ATH79_NVRAM is not set
 CONFIG_CMDLINE="rootfstype=squashfs noinitrd"
 # CONFIG_IP17XX_PHY is not set
+# CONFIG_LANTIQ_PHY is not set
 # CONFIG_MARVELL_PHY is not set
 # CONFIG_MICREL_PHY is not set
 # CONFIG_MTD_CFI is not set
@@ -212,6 +214,7 @@ CONFIG_MTD_NAND_ECC=y
 CONFIG_MTD_NAND_ECC_BCH=y
 # CONFIG_MTD_REDBOOT_PARTS is not set
 # CONFIG_MTD_SM_COMMON is not set
+# CONFIG_MTD_SPLIT_EVA_FW is not set
 # CONFIG_MTD_SPLIT_SEAMA_FW is not set
 # CONFIG_MTD_TPLINK_PARTS is not set
 CONFIG_MTD_UBI=y



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