ar71xx: add support for Fritz!Box 4020

This commit adds support for the AVM Fritz!Box 4020 WiFi-router.

SoC:   Qualcomm Atheros QCA9561 (Dragonfly) 750MHz
RAM:   Winbond W971GG6KB-25
FLASH: Macronix MX25L12835F
WiFi:  QCA9561 b/g/n 3x3 450Mbit/s
USB:   1x USB 2.0
IN:    WPS button, WiFi button
OUT:   Power LED green, Internet LED green, WLAN LED green,
       LAN LED green, INFO LED green, INFO LED red
UART:  Header Next to Black metal shield
       Pinout is 3.3V - RX - TX - GND (Square Pad is 3.3V)
       The Serial setting is 115200-8-N-1.

Tested and working:
 - Ethernet (LAN + WAN)
 - WiFi (correct MAC)
 - Installation via EVA bootloader
 - OpenWRT sysupgrade
 - Buttons
 - LEDs

Not working:
 - USB port

Installation via EVA:
In the first seconds after Power is connected, the bootloader will
listen for FTP connections on 169.254.157.1 (Might also be 192.168.178.1). Firmware can be uploaded
like following:

  ftp> quote USER adam2
  ftp> quote PASS adam2
  ftp> binary
  ftp> debug
  ftp> passive
  ftp> quote MEDIA FLSH
  ftp> put openwrt-sysupgrade.bin mtd1

Note that this procedure might take up to two minutes. After transfer is
complete you need to powercycle the device to boot OpenWRT.

Signed-off-by: David Bauer <mail@david-bauer.net>

5 files changed, 14 insertions, 0 deletions

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 906c4b715f..52f1ac3ecf 100755
--- a/target/linux/ar71xx/base-files/etc/board.d/01_leds
+++ b/target/linux/ar71xx/base-files/etc/board.d/01_leds
@@ -372,6 +372,12 @@ epg5000)
 	ucidef_set_led_wlan "wlan2g" "WLAN 2.4 GHz" "$board:blue:wlan-2g" "phy1tpt"
 	ucidef_set_led_wlan "wlan5g" "WLAN 5 GHz" "$board:blue:wlan-5g" "phy0tpt"
 	;;
+fritz4020)
+	ucidef_set_led_default "power" "Power" "$board:green:power" "1"
+	ucidef_set_led_netdev "lan" "LAN" "$board:green:lan" "eth1"
+	ucidef_set_led_netdev "wan" "WAN" "$board:green:wan" "eth0"
+	ucidef_set_led_wlan "wlan" "WLAN" "$board:green:wlan" "phy0tpt"
+	;;
 gl-ar300m)
 	ucidef_set_led_wlan "wlan" "WLAN" "$board:red:wlan" "phy0tpt"
 	;;
diff --git a/target/linux/ar71xx/base-files/etc/board.d/02_network b/target/linux/ar71xx/base-files/etc/board.d/02_network
index cbbcf53946..5898261b3d 100755
--- a/target/linux/ar71xx/base-files/etc/board.d/02_network
+++ b/target/linux/ar71xx/base-files/etc/board.d/02_network
@@ -243,6 +243,7 @@ ar71xx_setup_interfaces()
 		;;
 	archer-c58-v1|\
 	archer-c59-v1|\
+	fritz4020|\
 	rb-450g)
 		ucidef_set_interfaces_lan_wan "eth1.1" "eth0"
 		ucidef_add_switch "switch0" \
diff --git a/target/linux/ar71xx/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom b/target/linux/ar71xx/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
index 41ab43f7cb..6eb946468d 100644
--- a/target/linux/ar71xx/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
+++ b/target/linux/ar71xx/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
@@ -75,6 +75,9 @@ case "$FIRMWARE" in
 		ath9k_eeprom_extract "art" 4096 2048
 		ath9k_patch_firmware_mac $(macaddr_add $(mtd_get_mac_binary art 0) +1)
 		;;
+	fritz4020)
+		ath9k_eeprom_extract_reverse "urlader" 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 95314a2881..42bd80d9ad 100755
--- a/target/linux/ar71xx/base-files/lib/ar71xx.sh
+++ b/target/linux/ar71xx/base-files/lib/ar71xx.sh
@@ -709,6 +709,9 @@ ar71xx_board_detect() {
 	*"eTactica EG-200")
 		name="rme-eg200"
 		;;
+	*"FRITZ!Box 4020")
+		name="fritz4020"
+		;;
 	*"FRITZ!WLAN Repeater 300E")
 		name="fritz300e"
 		;;
diff --git a/target/linux/ar71xx/base-files/lib/upgrade/platform.sh b/target/linux/ar71xx/base-files/lib/upgrade/platform.sh
index 702d97a8ed..284582fa2b 100755
--- a/target/linux/ar71xx/base-files/lib/upgrade/platform.sh
+++ b/target/linux/ar71xx/base-files/lib/upgrade/platform.sh
@@ -686,6 +686,7 @@ platform_check_image() {
 		;;
 	# these boards use metadata images
 	fritz300e|\
+	fritz4020|\
 	rb-750-r2|\
 	rb-750p-pbr2|\
 	rb-750up-r2|\