FIXME 我正在使用这款路由器和学习OpenWrt,因此根据自己的需要,基于 WNDR3700 2012/08/05 05:43 的版本完成了部分的翻译。已翻译的部分基本上覆盖了刷机的要领。文档的其他部分的翻译也会在尽快在近期完成 — smallerxie 2012/08/07 19:00

网件 WNDR3700 和 WNDR37AV

网件公司所销售的很多本系列路由器的包装盒上都被标记为WNDR37AV。但这仅仅是出于市场因素考虑,其硬件是完全相同的(很多用户甚至发现标着“WNDR37AV”的包装盒内部其实是“WNDR3700”或者“WNDR3700v2”的路由器)。

支持的版本

版本号 发行日期 S/N 支持的OpenWrt 版本 备注
v1 Backfire 或 WNDR37AV-100PES, WNDR3700-100PES
v2 2011-01 Backfire 10.03.1 包装和侧面标签为 WNDR3700v2,或 WNDRMAC-100PES,WNDR3700-100prs
- 2011-03 Backfire 10.03.1 WNDR3800 是实际上的后继型号
v3 2011-09? ? WNDR3700v3 基于Broadcom芯片, 因此 完全不同于v1或者v2的架构

在安装OpenWrt之后,如果你想知道路由器的版本,可以运行

dmesg | grep m25p80
然后看一下硬件配置 (ver1 是 8 MB , ver2 是 16 MB).

无法通过查看修订编号(Revision Number)来区分路由器的版本,因为这毫无规律。甚至于不同版本的路由器会在包装盒侧面具有相同的EAN条码。唯一能够通过包装盒来区分版本的办法是查看侧面的印刷内容,在“Package Contents”的下方,如果是v2版,会写着"N600 Wireless Dual Band Gigabit Router (WNDR3700v2)", 而v1版只会简单写着WNDR3700。

注:目前中国大陆的行货以带有100PRS后缀的居多。根据网件官网客服的解释,NETGEAR WNDR3700-100PRS 10周年纪念版为近期NETGEAR市场部门与部分网站合作推出的十周年推广活动,系WNDR3700v2版本,其中-100RPS为订货号,表示中文包装,因此100PRS后缀并不代表硬件有差别。 — Yuchen Xie 2012/08/06 16:00

netgearwndr3700v1v2.jpg

请注意: 传说某一批v1版本的路由器存在2.4GHz无线会突然丢失的问题,具体是指包装盒上标记 -01R14 或者 -01R1的一批。也有人说 -01R21 或者 -02R01 不存在这个问题,可以稳定工作。而也有人说根据“Board Verion”查看,v4版本也值得信赖。仔细看一下图片,至少可以发现3处都涉及“版本号”。这个问题具体参见http://spreadsheets.google.com/pub?key=0AjNDNODfzgytdEJvZ0N0SkFLejFJZzBHcnFaaUg4OGc&hl=en&output=html.

硬件概览

版本号 CPU RAM Flash 网口 USB 串口 JTag FCC
V1 Atheros AR7161 rev 2 680 MHz 64MB 8MB 4 x 1 Yes Yes Yes here
V2 Atheros AR7161 rev 2 680 MHz 64MB 16MB 4 x 1 Yes Yes Yes here
V3 Broadcom BCM4718A1 64MB 8MB 4 x 1 Yes ? ? here

安装

请查看 →安装OpenWrt(通用) 并在下面阅读有关WNDR3700的特殊之处:

  • 硬件版本为v1的这款路由器在Backfire 10.03及以前就被支持,因此不需要手工编译OpenWrt最简单的办法是下载编译好的 稳定镜像文件, 请查找“wndr3700 factory”(推荐SquashFS):
    • openwrt-ar71xx-wndr3700-squashfs-factory.img 06-Apr-2010 2424965
    • openwrt-ar71xx-wndr3700-jffs2-factory.img 06-Apr-2010 3211397
  • v2版在Backfire 10.03.1(发布于2011-12-21)后被支持:
  • v3版目前还不被OpenWrt支持.
  • 也可以选择Trunk版本的编译好的镜像(测试版): http://downloads.openwrt.org/snapshots/trunk/ar71xx/.
  • 你可以编译自己的固件, 可以看这里的 HowTo:build.wndr3700.
  • WNDR3700和WNDR3700v2有不同的镜像(因为固件要进行不同的标记)。WNDR3700v2会拒绝WNDR3700的镜像。v2版的镜像从 Backfire 10.03.1-RC5 之后开始发布.

:!: 推荐 SquashFS 版!这里是两个版本的区别:filesystems。如果感兴趣,你可以从这里了解 img 和 bin 格式的区别: .

Flash 结构

简易刷机方法

在原生的WNDR3700路由器固件的GUI界面中上传OpenWrt的固件镜像即可安装。非北美的用户可能会收到一个关于“OpenWrt总是认为路由器处于北美地区”的警告。但是无须担心,忽略即可。 Netgear WNDR3700 - OpenWrt New User(s)

OEM installation using the TFTP method

Hold the 'System Restore' button on the underside of the router while powering it on, and hold the button until the power led blinks green. Then, upload the .img firmware as described in Installing OpenWrt via TFTP (see the section titled Bootloader contains TFTP server). However, note that the router will not accept the firmware when the filename is too long! Using firmware.img as filename should work. After upload, the power led is turned off and flashing starts, after that is finished the router will restart and the power led will eventually become stable green (it will be stable orange for quite some time first).

OEM installation via serial console and TFTP

  • Connect via serial console
  • Interrupt U-Boot by pressing any key
  • You may need to enable writes to the flash by issuing "protect off all"
  • At the U-Boot promt enter the fsload command
  • A TFTP server starts listening on port 192.168.1.1
  • Start TFTPing the image now
    • For the V1: openwrt-ar71xx-generic-wndr3700-squashfs-factory.img
    • For the V2: openwrt-ar71xx-generic-wndr3700v2-squashfs-factory.img

tftp 192.168.1.1
mode binary
put openwrt-ar71xx-generic-wndr3700XXX-squashfs-factory.img
quit

升级 OpenWrt

请查看→ 系统升级

基本设置

请查看→ 基本设置.

启用无线功能

至少 Backfire 10.03 的镜像 (openwrt-ar71xx-wndr3700-squashfs-factory.img 06-Apr-2010 2424965) 默认没有开启无线功能,这是由于缺少无线芯片所需的某些内核模块,但这很容易修复。用SSH登陆到你的路由器(你可能首先需要使用Telnet连接到路由器并设置一个密码,请参考 首次登陆 ),然后运行以下指令(假设路由器已经有Internet的连接):

# opkg update
# opkg install kmod-ath9k wpad-mini

完成后重启路由器即可。

无线频段管制问题

除非你在美国,否则在 OpenWrt 10.03 Backfire 中,2.4GHz 和 5GHz 可能都无法充分发挥其功能。(你会发现无法使用信道 12, 13 和 14,即使这些信道在你的地区是可以使用的,5GHz 信道也可能无法正确使用。功率等级也可能不符合你所在国家的要求。)

我们总结一下这种情况的背景:

  • Netgear ships the WNDR3700 with EEPROM chip stating that the router should restrict to US settings. Outside America, they ship software that ignores this chip. This is a bad thing as it means that your OpenWrt can't work properly for the next two reasons.
  • In the USA, it is illegal to ship router firmware that can (through incorrect settings) bypass radio regulations.
  • Atheros (the wireless chip maker in the WNDR3700) asks open source folks not to ship compiled builds that bypass radio restrictions, even though their hardware vendors do this. This means if you bought hardware from one of the manufacturers (and you're one of the 95% of the world's population that doesn't live in the USA) that doesn't set the value in the EEPROM correctly, you're kinda screwed if you want to use OpenWrt…

Personally, I think this is a ridiculous situation, but there seem to be issues with fixing it. You can do the job yourself as follows:

You may partially fix this by compiling a custom image with CONFIG_ATH_USER_REGD set in the Ath9k driver. This will, however, take a significant time to compile and result in a restriction to 20dBm max power output across all channels (this is apparently due to a bug according to my reading, but it's not fixed yet as far as I can tell). A much better option that will allow you to use the full legal power output in your country would be to follow the instructions here:

http://smorgasbord.gavagai.nl/2010/09/wifi-regulatory-compliance-and-how-to-fix-it/

They're a little complex, so I've uploaded my fixed regulatory.bin to RapidShare to save you all the hassle of learning to compile one yourself. Hopefully someone will move it somewhere more permanent and update this. Anyhow, this is me doing my bit to make this whole process better and usable for more people…what you need to do is as follows:

  1. If you're living in the USA, congratulations. You don't need to do any of this as you live in the only country anyone seems to care about making things easy for.
  2. Set up your router so that it is able to access the internet or the later step involving wget will fail (unless you host the file on your local network).
  3. Enter the following:

cd /etc/config
vi wireless

Add the following to each radio for your router (this will prevent you exceeding the regulatory limits in your country when you do the next bits):

option 'country' 'XX'

(Where XX is the two letter country code for your country. For example, Australia is AU).

(if those are ISO 2 letter country codes, a list is available here: http://en.wikipedia.org/wiki/ISO_3166-1_alpha-2 If not, then someone please clarify what codes are those.)

2. Download the following file: https://rapidshare.com/files/458836427/regulatory.bin. Put it on a web server (sorry I can't give you a direct link, or you'd be able to do without this step (RapidShare doesn't allow direct downloads without looking at their page, so don't try to skip putting it on a web server or server on your network - hopefully someone can improve this process using their private server as the file's only tiny)). NEW: Instead of your own webserver, you can also use http://datatomb.de/mirror/stuff/regulatory.bin

Enter the following:

cd /usr/lib/crda/
rm regulatory.bin
wget <web server URL>/regulatory.bin
reboot

3. When your router comes up again, log in with SSH as you did before. Check the available channels and power outputs are as desired by entering:

iw list

4. If you want to see what settings I put in the regulatory DB (they're as per the article I linked at the beginning) you can get them here: https://rapidshare.com/files/458836748/db.txt . If for some reason you want to use this to set the proper regulatory settings for the USA, you need to use UX as the country code…otherwise all country codes are still correct.

Specific Configuration

Interfaces

The default network configuration is:

Interface Name Description Default configuration
br-lan LAN & WiFi 192.168.1.1/24
eth0 LAN ports (1 to 4) None
eth1 WAN port DHCP
wlan0 WiFi Disabled
wlan1 WiFi Disabled

Switch Ports (for VLANs)

Numbers 0-3 are Ports 4 to 1 as labeled on the unit, 5 is the internal connection to the router itself. Don't be fooled: Port 1 on the unit is number 3 when configuring VLANs. vlan0 = eth0.0, vlan1 = eth0.1 and so on.

Port Switch port
CPU (eth0) 5
No port 4
LAN 1 3
LAN 2 2
LAN 3 1
LAN 4 0

WAN port is a gigabit port. VLANs can be configured to work on both LAN and WAN.

To create a VLANx on WAN port (eth1) declare an interface as "eth1.x". It can be further bridged with one of the switch ports if necessary.

For the LAN interface two actions are needed:

  • Declare "eth0.x" interface
  • Define switch_vlan configuration for each of the switch ports.

When vlans are defined on the switch ports VLAN0 cannot be used on eth0 any more. So the default router configuration must be changed, otherwise traffic stops on the switch ports and hard reset is needed.

Here is an example. WAN port is trunked on VLAN6 and VLAN4. VLAN6 has dhcp protocol defined. VLAN4 is bridged with one of the switch ports. LAN ports 1-3 are assigned to default VLAN1 (VLAN0 is not possible for some reason). LAN port 4 is assigned to VLAN4 and bridged with WAN.

So all the traffic that goes to switch port 4 will also pass to WAN's vlan4. Switch port numbering is other way around from physical ports.

config interface lan option ifname eth0.1 option type bridge option proto static option ipaddr 192.168.1.1 option netmask 255.255.255.0 config interface wan option ifname eth1.6 option proto dhcp config interface vlan4 option type bridge option ifname "eth0.4 eth1.4" option proto static option ipaddr 192.168.20.1 option netmask 255.255.255.0 option defaultroute 0 config switch option name rtl8366s option reset 1 option enable_vlan 1 option blinkrate 2 config switch_vlan option device rtl8366s option vlan 0 option ports "5*" config switch_vlan option device rtl8366s option vlan 1 option ports "1 2 3 5t" config switch_vlan option device rtl8366s option vlan 4 option ports "0 5t"

Note: The switch ports are not properly shown in the Backfire 10.03.1-rc4 Luci-interface, unless you add the chip name to the 'config switch' line: like 'config switch rtl8366s'. After making that addition, Luci shows the VLANs properly at the Network/Switch page. (Reference: https://dev.openwrt.org/ticket/7830 )

交换机 LED 配置

WNDR3700的交换机支持下面2个LED组:

  • Group 1: 交换机所有端口上的绿色LED
  • Group 2: 交换机所有端口上的橙色LED

每一组都可以被配置为以下16种模式之一:

  • 模式 0: LED熄灭
  • 模式 1: 冲突/全双工指示:检测到冲突时将闪烁,全双工模式下点亮,半双工模式下熄灭。
  • 模式 2: 链路/活动指示:链路连接时点亮,链路活动时(相应端口有数据收发)闪烁。
  • 模式 3: 1000Mb/s网速指示:在1000Mb/s时点亮。
  • 模式 4: 100Mb/s网速指示:在100Mb/s时点亮。
  • 模式 5: 10Mb/s网速指示:在10Mb/s时点亮。
  • 模式 6: 1000Mb/s网速/活动指示:在1000Mb/s时点亮,相应端口有数据收发时将闪烁。
  • 模式 7: 100Mb/s网速/活动指示:在100Mb/s时点亮,相应端口有数据收发时将闪烁。
  • 模式 8: 10Mb/s网速/活动指示:在10Mb/s时点亮,相应端口有数据收发时将闪烁。
  • 模式 9: 10/100Mb/s网速/活动指示:在10/100Mb/s时点亮,相应端口有数据收发时将闪烁。
  • 模式 10: 光纤链路指示:光线链路时点亮。
  • 模式 11: 出错指示:错误时点亮。
  • 模式 12: 链路/活动指示:链路连接时点亮,相应端口有数据发送时闪烁。
  • 模式 13: 链路/活动指示:链路连接时点亮,相应端口有数据接收时闪烁。
  • 模式 14: 主链路(Link on Master)指示:Link Master建立时点亮。
  • 模式 15: LED状态将取自单独的寄存器。

一个简单的配置是:橘色LED指示10/100 Mb/s连接,绿色指示1000 Mb/s连接,且在链路活动时闪烁:

swconfig dev rtl8366s port 1 set led 6
swconfig dev rtl8366s port 2 set led 9

(请注意:swconfig port实际上是led组编号,最后一个数字是预设置的模式。)

你还可以通过这些值来控制LED闪烁的速率: 0 = 43ms, 1 = 84ms, 2 = 120ms, 3 = 170ms, 4 = 340ms, 5 = 670ms.

swconfig dev rtl8366s set blinkrate 2

请注意: 被编译到Backfire 10.03.1-rc4 (或更早版本)中的LED设置和路由器底部的说明不相符。为了使LED状态和标签一致,(绿色LED指示1000Mb/s),可以对port1使用模式6,对port2使用模式9,对port5使用模式2。在后来的trunk和Backfire版本中均已修复这一情况。你可以使用swconfig命令行工具或者直接编辑文件'/etc/config/network'请参考:https://dev.openwrt.org/ticket/8103

在Backfire中激活USB LED

安装软件包 'kmod-leds-wndr3700-usb'.

向 /etc/config/system 增加USB LED 配置入口(你可以手动编辑文件或者使用Luci界面的“/System/LED_Configuration”配置页面)

config 'led' option 'name' 'USB LED' option 'sysfs' 'wndr3700:green:usb' option 'default' '0'

但是到此我们还只能给USB LED附加一个默认的状态,LED并不会自动点亮。你还需要为热插拔设置创建一个入口:

应该在此增加一个入口 '/etc/hotplug.d/usb/10-usb',然后你的USB LED就可以工作了。不要有其他幻想(比如磁盘活动时将闪烁),但是这可以实现USB磁盘插入时点亮,卸载时熄灭。

文件 /etc/hotplug.d/usb/10-usb 的代码:

#!/bin/sh # Copyright (C) 2009 OpenWrt.org case "$ACTION" in add) # update LEDs echo "255" >/sys/devices/platform/wndr3700-led-usb/leds/wndr3700:green:usb/brightness ;; remove) # update LEDs echo "0" >/sys/devices/platform/wndr3700-led-usb/leds/wndr3700:green:usb/brightness ;; esac

LED现在应可以随USB设备的插入/卸载而变化。

注意:请参考原网页: https://forum.openwrt.org/viewtopic.php?pid=105502#p105502

硬件按钮

监视按钮动作

WNDR3700当前的按钮定义(r25360)在Backfire和trunk版本中有不同名称:

Reset WPS WiFi
Backfire BTN_0 BTN_1 BTN_2
Trunk reset wps BTN_2

激活按钮

WiFi 按钮

该按钮已经在 wifitoggle 软件包中自动配置了。只需要在 '/sbin/wifi' 脚本中创建按钮的hotplug事件。

  • 如果至少一个无线开启,按钮将关闭WiFi;
  • 如果两个无线均已关闭,按钮将将根据normal wireless config中的设置开启WiFi。

安装 wifitoggle 和设置的步骤如下:

opkg update
opkg install wifitoggle

uci set wifitoggle.@wifitoggle[0].button=BTN_2
uci set wifitoggle.@wifitoggle[0].timer=0
uci commit wifitoggle

WPS 按钮

There is support for the WPS button removing the wpad-mini package and installing the full version of wpad & hostapd-utils packages.

If you have a WPS enabled network device (like a 模式rn USB dongle), you can negotiate joining the routers wireless network without manually entering SSID & passkey. You just initiate "WPS authentication" by pushing the similar WPS button on the device (or launching the process by its driver/control software). After the device has initiated the authentication process, you can accept the transaction by using the WPS button on WNDR3700. The connection should then get negotiated, and in most cases in future your PC should remember the received network settings from then on.

After finding the information and browsing the hostapd package sourcecode, the needed actions for enabling the WPS button are pretty simple:

  1. Using WPS authentication in requires replacing the default wpad-mini package with wpad and hostapd-utils. The reason is that the tool "hostapd_cli" and some needed support functions are not included in 'wpad-mini'. WPS authentication itself is launched with a command:
    hostapd_cli -p /var/run/hostapd-phy0 wps_pbc
    It tells the running hostapd daemon to participate in ongoing WPS authentication sequence. It needs to be run separately for each radio (= each existing hostapd process).
  2. And it only works if the '/etc/config/wireless' has been modified to include info about WPS authentication being allowed by adding the option 'wps_pushbutton' '1' to the wifi-iface section of (each) radio. (Looks like the version of hostapd scripts in OpenWrt does not support the full scope of hostapd's capabilities, so many of the config options documented in hostapd docs are left unused.)
  3. That config file is read when radios are turned on, so after editing the config, restart the radios in WNDR3700. At this point, you should be able to test it by running it from command line.
    If the message gets passed to hostapd, you should see there result 'OK' there. Otherwise the result is 'FAIL'.
    root@OpenWrt:~# wifi
    [..]
    root@OpenWrt:~# hostapd_cli -p /var/run/hostapd-phy0 wps_pbc
    Selected interface 'wlan0'
    OK
    root@OpenWrt:~#
  4. Add a hotplug button event script to launch the process. I modified directly the hostapd package source ( /package/hostapd/files/wps-hotplug.sh ), as the hotplug script gets automatically installed to /etc/hotplug.d/button/50-wps with the package. See below.
    The script launches hostapd_cli for each radio and lights the WPS led for 10 seconds. There is no monitoring of the result, or anything like that. It is just a dumb script using the hostapd_cli command to pass the message to the hostapd daemon.
    Note: button is called BTN_1 in Backfire, wps in trunk. /etc/hotplug.d/button/50-wps
    if [ "$ACTION" = "pressed" -a "$BUTTON" = "BTN_1" ]; then
            for dir in /var/run/hostapd-*; do
                    [ -d "$dir" ] || continue
                    logger "WPS button active: $dir"
                    hostapd_cli -p "$dir" wps_pbc
            done
    fi
    /etc/config/wireless
    config 'wifi-iface'
            option 'device' 'radio0'
            option 'network' 'lan'
            option '模式' 'ap'
            option 'ssid' 'public'
            option 'encryption' 'psk2'
            option 'key' 'SecretKey'
            option 'wps_pushbutton' '1'
    
    If everything goes ok, you should see in Syslog not only the button events, but also succesful WPS authentication.

Reset 按钮

如果你只想要一个简单的复位按钮的功能,你可以安装 restorefactory 软件包并进行如下配置:

opkg update
opkg install restorefactory

至少应为复位按钮设置正确的值。复位按钮在trunk中被称为 'reset' ,在Backfire final中被称为 'BTN_0' 。

uci set system.@restorefactory[0].button=reset
uci commit system

在恢复出厂设置后你必须重新安装和配置 restorefactory 软件包。如果你编译了自己的含有已经配置好 restorefactory 的镜像,可以跳过本步。

USB转串口控制台

利用USB转串口适配器很容易创建一个USB转串口的控制台。参考 usb.enabled.routers 来设置。

可以使用你喜欢的软件来连接控制台 - 我用的是miniterm,并使用了默认的9600波特率: miniterm -b9600 -d/dev/ttyS0

硬件

信息

架构: MIPS
芯片制造商: Qualcomm Atheros
Bootloader: crippled U-Boot
片上系统: AR7161
CPU/Speed 24Kc V7.4 680 MHz
Flash芯片: v1: Spansion S25FL064P (FL064PIF) or Macronix MX25L6405DMI-12G, v2: Macronix MX25L12845EWI-10G
Flash容量: v1 8192 KB;v2 16384KB
RAM芯片: 2 X Nanya NT5DS16M16CS-5T
RAM: 64 MB
无线模块: Atheros AR9223 802.11bgn / Atheros AR9220 802.11an
交换机模块: Realtek RTL8366SR
Internet模块: n/a
USB: 有 1 x 2.0
串口:
JTAG: Y有

图片

拆机图片

警告: 本操作会失去保修!

  • To remove the cover use a Torx (T-8) screwdriver.
  • There are two screws easily visible on the bottom of the case.
  • There are four more screws under the rubber feet. The feet are not glued to the plastic and can easily be removed and pushed back into place once reassembled. The feet have rubber tethers, but you can slide them out gently without damaging them, and later you can reinsert them just as easily. Don't forget to put them in a plastic baggie so you don't lose them!

Serial

Internal J1 4-pin connector

Pin Out Description
Pin1 3.3V
Pin2 TX
Pin3 RX
Pin4 GND

WNDR3700 serial pin connector

3.3V serial port voltage !!!

COM port settings: Speed:115200, Data bits:8, Stop bits:1, Parity:none, Flow control:none

JTAG

Internal J3 connector

14 Pin header

Pin Out
Pin1 TRST Pin2 GND
Pin3 TDI Pin4 GND
Pin5 TDO Pin6 GND
Pin7 TMS Pin8 GND
Pin9 TCK Pin10 GND
Pin11 RST Pin12 NC
Pin13 NC Pin14 3.3VDC

See port.jtag for more JTAG details.

刷机失败后的恢复方法

如果你不幸将路由器刷成砖了,别害怕,你还可以使用 TFTP 协议来刷入一个新的固件。

准备:

  • 一个TFTP客户端软件,命令行或者图形界面的均可。
  • 电脑IP必须设置为 192.168.1.x ,因为路由器默认的恢复模式IP被设置为 192.168.1.1.
  • 一个新的需要刷入的固件,网件原生固件或者OpenWrt的 "factory.img" 固件均可,但不能是 "Sysupgrade" 版本。
  • 能够按下路由器Reset按钮的工具。

刷机步骤:

  1. 设置好PC端,用网线连接路由器和PC
  2. 打开路由器电源
  3. 当交换机的LED灯亮起时,迅速按下RESET按钮
  4. 保持按住RESET,直到电源LED开始闪烁黄色到绿色
  5. 当电源LED闪烁绿色时,松开RESET
  6. 使用TFTP客户端传送固件到路由器的IP 192.168.1.1.
  7. 等几分钟,路由器将完成刷机,并自动重启

务必注意:TFTP 传送固件很快(因为文件被存储到RAM中)。但是,路由器刷新固件将需要几分钟时间,之后会自动重启。一定保持耐心 – 参考: https://forum.openwrt.org/viewtopic.php?pid=103295#p103295

Alternative advice

Forum user ole.h previously posted a method for unbricking the router easily with a TFTP client. Further to his post, if you use the factory reset button method, you don't need to worry about building a serial cable, trying to tap into any crazy boot timing sequence, or do anything else particularly tricky. It is simple and the following step-by-step process (cribbed from the ole.h's earlier notes, as well as from http://cyberstorm.altervista.org/wag354g/guides/howto_unbricking_wag354g_en.txt) will get you going. This assumes that you have a copy of the stock NETGEAR firmware in the current directory.

  1. Configure your ethernet connection (on the client machine you're using to configure the WNDR3700) using a static IP as 192.168.1.2, netmask 255.255.255.0. (The WNDR3700 in factory reset 模式 is going to come up as 192.168.1.1.)
  2. Connect your computer to one of the LAN (not WAN) ports on the router.
  3. Start a continuous ping from your client computer to 192.168.1.1 (Linux and Mac OS ping will continue until stopped by default; Windows ping by default sends 4 pings and then stops, so use "ping -t" under Windows); probably nothing will answer these pings yet, but you can use the output to tell you when the router is ready in the next couple steps.
  4. Power the router off.
  5. Hold down the factory reset button on the bottom of the case. Now turn the router back on while continuing to hold the factory reset button…
  6. Wait until the router is listening on 192.168.1.1 (this takes 45-60 seconds; to confirm, you can ping 192.168.1.1, and see if it responds; it's best to start a sequence of ping requests above, before your hands get busy with the factory reset button).
  7. Release the factory reset button. (If you happen to have a serial cable connected, you'll see that the system is in firmware recovery 模式 and that it will be waiting for you to upload firmware. But you don't need the serial cable at all.)
  8. Run a tftp CLIENT on your computer (enter no hostname on the command line) and enter the following:
    verbose
    trace
    rexmt 1
    binary
    connect 192.168.1.1
    put WNDR3700-V1.0.4.35NA.img (or whatever the filename is that you are trying to flash)

Once done, the router will flash itself to the stock NETGEAR firmware file that you provided and reboot automatically.

Serial cables (optional)

Construction

If you have a basic familiarity with RS232 signals and putting together basic electronic components, you should be able to follow these instructions to create a cable to attach to the WNDR3700's serial port.

The author of this section prefers a two-step process, that of using a USB-to-9-pin-serial (DB9) connector for the computer, and then building a separate 9-pin-serial-to-board interface. This allows you to leave the connector plugged into the board all of the time (and close the plastic case of the router!), without having a USB dongle hanging around when not using it. If you use a ribbon cable to connect to the header on the router, you can actually snake it out between the 4-port LAN jack and the WAN jack and still get the router's case back on (albeit a bit snugly), so the system looks pretty clean and polished even after adding the serial port connector.

For the computer-to-9-pin-serial part, you probably have two options:

  1. Buy a Nokia CA-42 cable and be comfortable stripping wires and using a multimeter.
  2. Buy a premade USB-to-DB9 RS232 serial cable. IMPORTANT NOTE I haven't bothered to look to see if the standard RS232 voltages are compatible with the WNDR3700 board. I think I recall reading somewhere that the CA-42 cable is 3.3V, and I don't recall offhand what RS232 calls for. If you buy a premade USB-to-DB9 RS232 cable, make sure to check the output levels with a voltmeter to ensure that you don't fry anything!

Never ever connect RS232 directly to your router board !!! The +/- 12V RS232 will be frying your board. You need a 3V-TTL to RS232 level shifter like MAX3223 in between.

For step 1:

If you buy a premade USB-to-DB9 RS232 cable, this step is already done. (Whichever method you use, make sure that your OS has drivers for the USB converter that you are planning to use!)

If you go the CA-42 cable route, follow the "Determining the wiring assignment of your cable" steps listed in this page: http://buffalo.nas-central.org/index.php/Use_a_Nokia_Serial_Cable_on_an_ARM9_Linkstation. This page refers to a different router product, but the CA-42 cable being used is the same and your goal is to determine the pin/color assignments. You have to chop off the fancy Nokia connector and then strip wires to test wire colors with your multimeter to figure out which color corresponds to which Nokia pin number. Once you've figured that out:

Pin 6 of the Nokia connector should be wired to pin 3 on the DB9. Pin 7 of the Nokia connector should be wired to pin 2 on the DB9. Pin 8 of the Nokia connector should be wired to pin 5 on the DB9.

You should wire this cable with a male DB9 connector, which will connect to the female connector that you put on the board side of things.

For step 2:

For connecting to the WNDR3700 itself, forum user whiskas previously posted the pinout of the connector at http://img387.imageshack.us/i/26102009417.jpg/. The four pins on the board (reading from left to right in whiskas's photo) correspond to DB9 pin numbers 5, 3, 2 and no connection. You'll probably want to buy a crimp-style socket (I used a "IDC 10-pin dual row socket", which has more pins than we need but which works fine) and a ribbon cable that connects to it. Buy a 9-pin female DB9, carefully sort out which pins in the ribbon cable need to be connected to what, and crimp them into the right place. If you use crimp-style connectors, you can do this with no tools other than steady hands, and the IDC socket will slide right onto the board without having to solder anything.

U-Boot Mods

According to the release notes in the NETGEAR-supplied GPL firmware, U-Boot can be upgraded using the following procedure. Note that you do not need to update U-Boot in order to install OpenWrt. Additionally, this has not yet been tested by the author of this wiki page, and you can permanently brick your router (with little hope of recovery, other than possibly finding a JTAG interface) if your U-boot image becomes corrupted:

Please burn u-boot-wndr3700-dni6-V1.7.bin
Set up a tftp server on your PC, its ip address is 192.168.1.12.
Entering into boot loader
ag7100> set serverip 192.168.1.12
ag7100> tftp 0x80010000 u-boot-wndr3700-dni6-V1.7.bin
ag7100> erase 0xbf000000 +0x70000
ag7100> cp.b 0x80010000 0xbf000000 0x50000
ag7100> reset
Entering into boot loader again
ag7100>bootm
Then the device should be in tftp recovery 模式. Please run the command
"tftp -i 192.168.1.1 put WNDR3700U-V1.0.4.49.img" on MS-DOS of your PC.

Flashing over serial

If, for whatever reason, you would prefer to avoid tftp flashing, it's possible to load a new image with y模式m (loady) or kermit (loadb). It's a good idea to use iminfo to verify the image's checksum before copying it to flash with cp.b. Remember to use the sysupgrade .bin file even if this is your initial flash from the factory firmware; the extra header in the factory .img is NOT required when flashing from U-Boot.

ar7100> loady 80800000
## Ready for binary (y模式m) download to 0x80800000 at 115200 bps... 
(Begin the y模式m or kermit transfer)
## Total Size      = 0x004d0004 = 5046276 Bytes
ar7100> iminfo 80800000

## Checking Image at 80800000 ...
   Image Name:   MIPS OpenWrt Linux-3.3.8
   Created:      2012-07-01  17:49:09 UTC
   Image Type:   MIPS Linux Unknown Image (uncompressed)
   Data Size:    914224 Bytes = 892.8 kB
   Load Address: bf070000
   Entry Point:  bf070000
   Verifying Checksum ... OK
ar7100> erase 0xbf070000 +0x004d0004
Erase Flash from 0xbf070000 to 0xbf54ffff in Bank # 1 
First 0x7 last 0x54 sector size 0x10000
  84
Erased 78 sectors
ar7100> cp.b 0x80800000 0xbf070000 0x004d0004
Copy to Flash... write addr: bf070000
done
ar7100> boot

Note that the size value (0x004d0004 in this case) will vary from one image to another. Don't omit the "+" in the erase command as it's part of the command's syntax.

Hardware Mods

128 MB RAM Mod

NEW: More and More people reports serious issues after correctly replace ram chips on WNDR3700V2. For now users are advised to stay away from extending RAM on WNDR 3700V2 untill we will have positive feedback on this procedure.

Warning: There are reports (User batu at http://eko.one.pl/forum/viewtopic.php?id=2454) that 333Mhz chips dont work with wndr3700v2. Use 400Mhz chips if available.

I used two Samsung K4H511638D-UCCC. You can use chips from other manufacturers, but they should be DDR400 32Mx16 organization in the package TSOP-II 66pin. Chips with other organizations, such as 64Mx8, do not fit.

A list of compatible chips:

Manufacturers Mark Comments
Samsung K4H511638D-UCCC 400Mhz - definitely not working with wndr3700v2
Samsung K4H511638B-TCB3 333Mhz - not working with wndr3700v2
Samsung K4H511638D-UCB3 333Mhz - definitely not working with wndr3700v2
Hynix HY5DU121622CTP-J 333Mhz - definitely not working with wndr3700v2
Hynix HY5DU121622CTP-D43 333/400Mhz mixed reports. Propably not working with wndr3700v2
Hynix HY5DU121622CLTP
Hynix HY5DU121622DTP
Hynix HY5DU121622DLTP
Kingston K4H511638C-UCB3
Elpida D5116AFTA-5B-E
NCP NP25D3216512K-5
Nanya NT5DS32M16BS
infineon HYB25D512160BE
Micron MT46V32M16TG
Micron MT46V32M16TGЗ
Elixir N2DS51216BT-5T
Elixir N2DS51216CS-5T
Zentel A3S12D40ETP

Netgear WNDR3700 v1 with 128 MB RAM Mod Netgear WNDR3700 v1 with 128 MB RAM Mod

U-Boot report after adding memory

U-Boot 1.1.4DNI1.6 (May 22 2009 - 16:37:44) WNDR3700U (ar7100) U-boot 0.0.12 DRAM: b8050000: 0xc0140180 128 MB Top of RAM usable for U-Boot at: 88000000 Reserving 315k for U-Boot at: 87fb0000 Reserving 192k for malloc() at: 87f80000 Reserving 44 Bytes for Board Info at: 87f7ffd4 Reserving 36 Bytes for Global Data at: 87f7ffb0 Reserving 128k for boot params() at: 87f5ffb0 Stack Pointer at: 87f5ff98 Now running in RAM - U-Boot at: 87fb0000 id read 0x100000ff flash size 8MB, sector count = 128 Flash: 8 MB In: serial Out: serial Err: serial Net: ag7100_enet_initialize… ''


Antenna Mod

Need 4 U.FL connector, 4 cable UFL-F/RPSMA-F 13 centimeters long, 4 Antenna Level One (OAN-0501).

On board removes:

  1. Connectors (SWD) PJ2, PJ4, PJ5, PJ6
  2. Switches AS6, AS8, AS9, AS10
  3. Capacitors AC77, AC113, AC148, AC186

In place of the connector solder in U. FL connectors.
Solder shorts instead of capacitors AC77, AC113, AC148, AC186.
Solder shorts between 3 and 5-pin AS6 and AS8.
Solder shorts between 3 and 6 pin AS8 and AS10.

Drill four drill holes 6.5mm in the left side of the upper lid.
In a hole fasten cables UFL-F/RPSMA-F.
Insert the connector into the board as in the photo, and assemble the router.
Fasten to the connectors RPSMA-F antenna and turn on.

Netgear WNDR3700 v1 Antenn Mod Netgear WNDR3700 v1 Antenn Mod Netgear WNDR3700 v1 Antenn Mod Netgear WNDR3700 v1 Antenn Mod Netgear WNDR3700 v1 Antenn Mod Netgear WNDR3700 v1 Antenn Mod Netgear WNDR3700 v1 Antenn Mod Netgear WNDR3700 v1 Antenn Mod Netgear WNDR3700 v1 Antenn Mod Netgear WNDR3700 v1 Antenn Mod


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zh-cn/toh/netgear/wndr3700.txt · Last modified: 2013/05/16 07:39 by smallerxie