ar71xx: add support for Teltonika RUT900

Teltonika RUT900 is an industrial 3G router based on Atheros AR9344.

There are available 3 other models in RUT9xx series: RUT905, RUT950 and
RUT955, which differ in availability of additional I/O ports, built-in
GSM modem type, GPS antenna and other features. FCC ID of the RUT950
model (LTE module built-in): 2AET4-RUT950.

This patch adds support for the RUT900 model only but can be easily
extended to cover whole series. Also, as there are several different
3/4G modules (Huawei, Quectel, Telit) used in whole series, packages
required for WWAN support are not included by default. It is up to the
user to install required software for built-in modem.

Specification:

- 550/400/200 MHz (CPU/DDR/AHB)
- 128 MB of RAM (DDR2)
- 16 MB of FLASH (SPI NOR)
- 4x 10/100 Mbps Ethernet, with passive PoE support on LAN1
- 2T2R 2,4 GHz (AR9344), with ext. PA (MGA-22103) and LNA
- built-in 3G module (example: Telit HE910-D)
- 2x miniSIM slot
- 2x RP-SMA/F (Wi-Fi), 2x SMA/F (3G)
- PCA9539 16-bit GPIO I2C expander
- 12x LED (4 are driven by AR9344, 7 by PCA9539)
- 1x button (reset)
- DC jack for main power input (9-30 V)
- UART available on PCB edge connector

Serial console pinout:

- RX: pin1 (square) on top side of the main PCB (AR9344 is on top)
- TX: pin1 (square) on bottom side

Flash instruction:

Vendor firmware is based on OpenWrt CC release. Use the "factory" image
directly in GUI (make sure to uncheck "keep settings") or in U-Boot web
based recovery. To avoid any problems, make sure to first update vendor
firmware to latest version - "factory" image was successfully tested on
device running "RUT9XX_R_00.03.960" firmware and U-Boot "3.0.1".

Signed-off-by: Piotr Dymacz <pepe2k@gmail.com>

1 files changed, 42 insertions, 0 deletions

diff --git a/target/linux/ar71xx/image/generic.mk b/target/linux/ar71xx/image/generic.mk
index f1efebc523..3fbfca35e0 100644
--- a/target/linux/ar71xx/image/generic.mk
+++ b/target/linux/ar71xx/image/generic.mk
@@ -7,6 +7,15 @@ define Build/alfa-network-rootfs-header
 	@mv $@.new $@
 endef
 
+define Build/append-md5sum-bin
+	$(STAGING_DIR_HOST)/bin/mkhash md5 $@ | sed 's/../\\\\x&/g' |\
+		xargs echo -ne >> $@
+endef
+
+define Build/append-string
+	echo -n $(1) >> $@
+endef
+
 define Build/mkbuffaloimg
 	$(STAGING_DIR_HOST)/bin/mkbuffaloimg -B $(BOARDNAME) \
 		-R $$(($(subst k, * 1024,$(ROOTFS_SIZE)))) \
@@ -68,6 +77,17 @@ define Build/seama-seal
 	$(call Build/seama,-s $@.seama $(1))
 endef
 
+define Build/teltonika-fw-fake-checksum
+	# Teltonika U-Boot web based firmware upgrade/recovery routine compares
+	# 16 bytes from md5sum1[16] field in TP-Link v1 header (offset: 76 bytes
+	# from begin of the firmware file) with 16 bytes stored just before
+	# 0xdeadc0de marker. Values are only compared, MD5 sum is not verified.
+	let \
+		offs="$$(stat -c%s $@) - 20"; \
+		dd if=$@ bs=1 count=16 skip=76 |\
+		dd of=$@ bs=1 count=16 seek=$$offs conv=notrunc
+endef
+
 define Build/uImageHiWiFi
 	# Field ih_name needs to start with "tw150v1"
 	mkimage -A $(LINUX_KARCH) \
@@ -620,6 +640,28 @@ define Device/r602n
 endef
 TARGET_DEVICES += r602n
 
+define Device/rut900
+  DEVICE_TITLE := Teltonika RUT900
+  DEVICE_PACKAGES := kmod-usb-core kmod-usb2 -uboot-envtools
+  BOARDNAME := RUT900
+  SUPPORTED_DEVICES := rut900
+  IMAGE_SIZE := 15552k
+  MTDPARTS := spi0.0:128k(u-boot)ro,64k(config)ro,64k(art)ro,15552k(firmware),576k(event-log)ro
+  TPLINK_HWID := 0x35000001
+  TPLINK_HWREV := 0x1
+  TPLINK_HEADER_VERSION := 1
+  KERNEL := kernel-bin | patch-cmdline | lzma | tplink-v1-header
+  KERNEL_INITRAMFS := kernel-bin | patch-cmdline | lzma | uImage lzma
+  IMAGES := sysupgrade.bin factory.bin
+  IMAGE/factory.bin := append-kernel | pad-to $$$$(BLOCKSIZE) | append-rootfs |\
+	pad-rootfs | teltonika-fw-fake-checksum | append-string master |\
+	append-md5sum-bin | check-size $$$$(IMAGE_SIZE)
+  IMAGE/sysupgrade.bin := append-kernel | pad-to $$$$(BLOCKSIZE) |\
+	append-rootfs | pad-rootfs | append-metadata |\
+	check-size $$$$(IMAGE_SIZE)
+endef
+TARGET_DEVICES += rut900
+
 define Device/mc-mac1200r
   $(Device/tplink-8mlzma)
   DEVICE_TITLE := Mercury MAC1200R