Openwrt на роутер tp link tl wr841n

Беспроводной маршрутизатор серии N 300Мбит/с

Основные технические характеристики:

​Примечание​:​ TL-WR841N идентичен данной модели, но оснащен несъемными антеннами.

Примечание: v5.4, v5.2 и т.п. аппаратно идентичны v5. v7, v8, v9 аналогично. Различие минорных версий отражает лишь версию в предустановленных прошивки и загрузчика.

2. Войдите в веб-интерфейс маршрутизатора, перейдите в раздел System Tools — Firmware Upgrade и укажите образ дистрибутива как файл обновления.

3. По завершении прошивки маршрутизатор перезагрузится и будет доступен по адресу http://192.168.1.1

Для v8,v9,v10 все значительно проще

Внимание! Данный метод не рекомендуется к использованию если вы не понимаете о чем речь и никогда подобными вещами не занимались и учиться не хотите

Требуется консольный кабель с ttl уровнями usb-ttl, например DKU-5, или RS-232-TTL преобразователь
и tftp сервер на вашем компьютере,

Почти полностью взято отсюда https://forum.openwrt.org/viewtopic.php?id=24203, спасибо dl3daz.

2. Подключите WAN портом к своей локальной сети или напрямую к компьютеру с tftp сервером.(для 8.2 попробуйте LAN1 порт)

3. Подключите консольный кабель как описано в секции “serial console” (английская вики) и делаем “tpl” трюк (включаем роутер и сразу пишем в консоли tpl, это нужно сделать буквально за полсекунды, иначе не получится), чтобы получить нормальный доступ в консоль.

4. Теперь прописываем IP адресы для роутера и TFTP сервера (здесь названы соответственно ROUTERIP and SERVERIP, конечно же должны совпадать с реальными IP адресами (мы же не фигней маемся). Пишем в консоли:

   setenv ipaddr ROUTERIP
   setenv serverip SERVERIP
   printenv

Для примера, присвойте сетевой карте своего компьютера(TFTP сервера) статичный IP 192.168.1.100, если у вас есть другие сетевые карты, то рекомендую их выключить.
В консоли пишем:

setenv ipaddr 192.168.1.111
setenv serverip 192.168.1.100

192.168.1.111 ip роутера, 192.168.1.100 ip вашего TFTP сервера.

1. Дважды проверьте что ввели нужные адреса (printenv выводит на экран адреса) Проверяем, что ваш сервер находится на 69 порту(стандартный порт). Теперь загружаем прошивку через TFTP “tftpboot 0x80000000 имя_файла_прошивки.bin ”:

   ar7240> tftpboot 0x80000000 openwrt-ar71xx-tl-wr841nd-v8-squashfs-factory.bin
   Using eth0 device
   TFTP from server 192.168.1.100; our IP address is 192.168.1.111
   Filename 'openwrt-ar71xx-tl-wr841nd-v5-squashfs-factory.bin'.
   Load address: 0x80000000
   Loading: checksum bad
   #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            ######################################################
   done
   Bytes transferred = 3932160 (3c0000 hex)

2. Значение “3c0000” в последней строке (ваше число может отличаться). Теперь выполните следующие команды, меняйте 3c0000 на свое значение, которое вы получили из tftpboot

Для TL-WR841ND v3:

1. Чистим память:

 ar7100> erase 0xbf020000 +0x3c0000
                                                                             
First 0x2 last 0x3d sector size 0x10000                                      
  61                                                                         
Erased 60 sectors 

2. Копируем содержимое RAM в память:

 ar7100> cp.b 0x80000000 0xbf020000 0x3c0000                                  
Copy to Flash... write addr: bf020000                       
done 

3. Перезагружаем

 ar7100> reset                                               
                                                            
Resetting...

4. Всё.

Для TL-WR841ND v5, v7, v8, v9:

1. Чистим память:

wasp> erase 0x9f020000 +0x3c0000

2. Копируем содержимое RAM в память:

wasp> cp.b 0x80000000 0x9f020000 0x3c0000

3. устанавливаем загрузчик

wasp> bootm 0x9f020000
## Booting image at 9f020000 ...
Uncompressing Kernel Image ... OK

Starting kernel ...

4. Всё.

U-Boot 1.1.4 (Apr  9 2009 - 12:29:57)

Как и большинство нынешних роутеров может быть восстановлен без консольного кабеля.

1. Пропишите на сетевой карте компьютера статичный ip ​192.168.0.66​ (у роутера он ​192.168.0.86)

2. Закиньте factory OpenWrt образ в корень своего tftp сервера и назовите: для v8 mr3420v2_tp_recovery.bin ; для v9 ​wr841nv9_tp_recovery.bin ; для v10 wr841nv10_tp_recovery.bin​

3. На выключенном роутере зажимаете reset, не отжимая его, включаете роутер, держите ресет пока не загорится светодиод lock(крайний правый) .

4. Ждем пока роутер перезагрузится.

подробнее

1. Скачайте оригинальный образ прошивки с сайта TP-Link(у версий 1 и 1.5 абсолютно идентичные последние прошивки), для версии 3.

2. Извлеките файл из архива и посмотрите содержит ли он в своем названии слово boot,

Данный способ подходит для моделей V1, V3, V5, V7, V8 и V9; так как бутлоадер у них одного размера.
Для примера возьмем файл со словом “boot” в названии wr841nv9_en_3_14_4_up_boot(131129).bin
Вырезаем первые 0x20200 (это 131,584 = 257*512) байт прошивки:

dd if=wr841nv9_en_3_14_4_up_boot(131129).bin of=tplink.bin skip=257 bs=512

Получаете файл tplink.bin, данную команду можно провести на компьютере с linux/unix или на самом роутере(предварительно закачав его туда с помощью web сервера или по протоколу scp)

Так же вы можете просто скачать уже модифицированные файлы без boot блока

3. Полученный файл переименуйте во что-то типа tplink.bin и можете прошить через web интерфейс, если же возможности нет, то можно через консоль, используйте протокол SCP (для windows winscp), если вы на линуксе то и сами все знаете, так же можно воспользоваться веб-сервером в локальной сети):

root@OpenWrt:~# cd /tmp
root@OpenWrt:/tmp# wget http://192.168.1.110/tplink.bin

root@OpenWrt:/tmp# mtd -r write ./tplink.bin firmware

Вы так же можете попробовать уже описанный способ установки по tftp(boot часть опять же придется вырезать)

См. также Back to original firmware

Изменение данной настройки в домах с большой плотностью wifi точек, может только ухудшить производительность вашего роутера вечером, когда соседские точки сильно загружены.

Суть в том, что по умолчанию в Openwrt соблюдаются законодательства разных стран и при присутствии других wifi роутеров, ваш роутер сбрасывает канал 40mhz до 20 mhz, дабы не загрязнять эфир и не ухудшать собственную производительность, хотя сообщает что умеет 300МБит/c и 40mhz, а так как у нас режим MIMO 2:2, то при 20mhz получаем 130 МБит/с по стандарту.

Как исправить:

Заходим по ssh(если вы еще не установили пароль, то по telnet) и вводим команды:

uci set wireless.radio0.htmode=HT40 /выставляем ширину канала 40mhz, можно и через веб интерфейс.
uci set wireless.radio0.noscan=1 /запрещаем роутеру сканировать окружение.
uci commit wireless /записываем наши команды в конфигурационный файл.
wifi /перезагружает wifi интерфейс с новыми настройками без перезагрузки роутера.

И получаем честные 300МБит/c

Редактируем файл /etc/config/wireless

1. Под config wifi-device ‘radio0’ добавляем

   option noscan '1'

2. option ‘htmode’ выставляем значение HT40 (для билдов до BARRIER BREAKER(14.07) значение принимает HT40+ или HT40-)

   option htmode 'HT40'

Проверьте, что eth0/eth1 не перепутаны!

Содержание

1. Установка Openwrt на роутер TP-Link TL-WR841N: подробная инструкция
2. Подготовка к установке
3. Скачивание и установка прошивки Openwrt
4. Начало установки Openwrt
5. Настройка Openwrt после установки
6. Настройка сети и интернета в OpenWrt
7. Установка пакетов и дополнительных функций

Содержание

1. Установка OpenWRT на Tp link tl wr841n
2. Почему стоит установить OpenWRT на Tp link tl wr841n
3. Перед установкой OpenWRT на Tp link tl wr841n
4. Инструкция по установке OpenWRT на Tp link tl wr841n
5. Полезные советы по установке OpenWRT на Tp link tl wr841n
6. 1. Проверьте совместимость
7. 2. Создайте резервную копию
8. 3. Подготовьте все необходимые материалы
9. 4. Следуйте инструкциям
10. 5. Проверьте подключение
11. 6. Изучите возможности OpenWRT
12. 7. Обновляйте прошивку
13. Совместимые прошивки для Tp link tl wr841n
14. Преимущества и недостатки установки OpenWRT на Tp link tl wr841n
15. Преимущества:
16. Недостатки:
17. Как использовать OpenWRT на Tp link tl wr841n: полезные фишки и дополнительные возможности
18. 1. Установка пакетов с помощью опции «Пакетный менеджер»
19. 2. Настройка виртуальных интерфейсов
20. 3. Настройка VPN-сервера
21. 4. Управление трафиком с помощью QoS
22. 5. Настройка сетевого хранилища
23. 6. Настройка сервера печати
24. 7. Настройка сети гостей
25. 8. Мониторинг сетевого трафика

Table of Contents

The device is a wireless N router with

• 2 detachable antennas

• 4 Port 100/10 Switch

• 1 Port 100/10 Wan Interface

• 4 MB Flash

• 32 MB Ram

• QSS Button

• Reset Button

Note1: The TL-WR841N is identical except that the antennas are not detachable. TP-Link naming scheme is, that devices ending in a D have detachable antennas.

Note2: v5.4, v5.2 etc. are all v5, similarly for v7, v8, v9. The only difference is the firmware version the come with. v1 and 1.5 have same latest fw.

Known clones of this device:

• TP-Link TL-WR841ND v7: Rosewill Wireless N Router RNX-N300RT – see rnx-n300rt

• TP-Link TL-WR841N v8: ThinkPenguin TPE-NWIFIROUTER2 aka Rosewill RNX-N300RT v2 – see rnx-n300rt

• TP-Link TL-WR841ND v8: TP-Link TL-WR843ND v1, Mercury MW300R v3 and Fast FW300R v3.

The TP-Link versioning scheme seems to be:

• major-number.minor-number, where the major-number refers to hardware changes, and the minor-number refer to software (firmware) changes; this includes the bootloader!

• If there is a language-code. e.g. (DE)v1.0, that means, that the TP-Link WebUI is that language. (Of course LuCI has Native Language Support)

• Sometimes, version x. is only available in the PRC and version y. is intended for sale world-wide. The hardware between version x. and version y. can differ significantly but does not have to.

• Sometimes, there is Version x. for PRC only and Version x. for world-wide sale. If there is a special chinese-Version with the same major-number, then that version has usually significantly different hardware

The port indexes in OpenWRT and in hardware (on the case) are mangled (at least in Barrier Breaker):

The port indexes in OpenWRT and in hardware (on the case) are swapped:

It is possible to run 802.1Q tags on these ports. Mixed (tagged/untagged) currently untested.

eth1 is directly connected to the WAN port.

2. Log in to router web interface and select the firmware image you just uploaded as an update

3. Sit and wait while it flashes. It will reboot and be accessible at 192.168.1.1.

The Barrier Breaker image already includes a GUI, you do not have to install it manually.

Note: Newest version of tp link firmware (tested on TL-WR841N_V9_150310 / 3.16.9) does not accept openwrt firmware filename, so you have to rename the downloaded openwrt firmware to something what looks like stock firmware prior flashing, i.e. wr841nv9_wr841ndv9_en_3_16_9_up(150310).bin for V9 — check the zip with original firmware on tp link website for correct file name scheme — I’d suggest to remove «boot» word from filename, because openwrt firmware does not contain boot loader.

Warning! in some cases after reboot you don’t have web interface (GUI), only telnet and ssh access. You can install GUI, for details see: luci.essentials, but before install LuCI (GUI) you need to configure your router to have access to internet, for configuration see: internet.connection

For v8,v9 is much easier

Beware that this installation method needs a TTL level serial console usb to TTL like DKU-5 data cable or RS232-TTL level shifter like this:
and a working TFTP server and should not be attempted unless you have experience with this sort of thing or are eager to learn.

This is taken more or less verbatim from https://forum.openwrt.org/viewtopic.php?id=24203, thanks to dl3daz.

2. Hook your routers WAN ethernet port up to your network (for v8.2 it’s LAN1 ethernet port)

3. Hook up the serial console as explained in the section «serial console». At the prompt «Autobooting in 1 seconds» type «tpl» quickly to start a uboot console.

4. Now we need to set router and server IP addresses (here named ROUTERIP and SERVERIP, substitute these with the real IP addresses).

Type in the console:

setenv ipaddr ROUTERIP
setenv serverip SERVERIP
printenv

For example: Configure this static ip for your LAN card 192.168.1.100. If your computer containing other LAN or Wifi card, disable it!

Type in the console

setenv ipaddr 192.168.1.111
setenv serverip 192.168.1.100

192.168.1.111 is the router ip, 192.168.1.100 is the TFTP server ip.

1. Double check that the output of printenv lists the IP addresses you just set.

2. Uboot needs the tftp server to be listening on port 69. Make sure your server is configured to listen to that port. Now we can load the firmware over TFTP with «tftpboot 0x80000000 openwrt-ar71xx-generic-tl-wr841n-v8-squashfs-factory.bin»:

   ar7240> tftpboot 0x80000000 openwrt-ar71xx-generic-tl-wr841n-v8-squashfs-factory.bin
   Using eth0 device
   TFTP from server 192.168.1.100; our IP address is 192.168.1.111
   Filename 'openwrt-ar71xx-generic-tl-wr841n-v8-squashfs-factory.bin'.
   Load address: 0x80000000
   Loading: checksum bad
   #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            ######################################################
   done
   Bytes transferred = 3932160 (3c0000 hex)

3. Note the «3c0000» in the last line (your number may differ). Now execute the following commands, if necessary replacing 3c0000 with the number you got from tftpboot

Type:

printenv bootcmd

Take note of the address and use it as flash erase start address.

For TL-WR841ND v3:

1. Erase the flash:

 ar7100> erase 0xbf020000 +0x3c0000
                                                                             
First 0x2 last 0x3d sector size 0x10000                                      
  61                                                                         
Erased 60 sectors 

2.Copy RAM content to flash:

 ar7100> cp.b 0x80000000 0xbf020000 0x3c0000                                  
Copy to Flash... write addr: bf020000                       
done 

3.Reset

 ar7100> reset                                               
                                                            
Resetting...

4. Done.

For TL-WR841ND v5, v7, v8, v9:

1. Erase the flash:

wasp> erase 0x9f020000 +0x3c0000

2. Copy RAM content to flash:

wasp> cp.b 0x80000000 0x9f020000 0x3c0000

3. Set up the boot

wasp> bootm 0x9f020000
## Booting image at 9f020000 ...
Uncompressing Kernel Image ... OK

Starting kernel ...

4. Done.

As most other current TP-Link routers this device can be flashed and debricked without serial access. Basically, the procedure is as follows:

1. Set your PC to use the static IP address 192.168.0.66 (the router will have 192.168.0.86)

2. Put an OpenWrt factory image named wr841nv9_tp_recovery.bin in the root directory of an TFTP server and start it (for v8 image name must be mr3420v2_tp_recovery.bin)

3. Power on the router while pressing the reset button until the lock LED is lighting up

4. Wait for the router to reboot

For details, see reset_button_method_no_serial_cable_needed

With the TL-WR842ND router, there is a catch: the stock firmware is obtained from the OEM: versions 1,5,7,8,9(verions v1 and v1.5 have same latest fw) and link for v3

• in case the file name of this firmware file does not contain the word «boot» in it, you can simply revert back to original firmware

• in case the file name of this firmware file does contain the word «boot» in it, you need to cut off parts of the image file before flashing it:

The following method applies both for the V1 V3 V5 V7 V8 and V9 since the bootloader is the same size.

An example of an image file with the word «boot» in it is wr841nv9_en_3_14_4_up_boot(131129).bin.

Cut the first 0x20200 (that is 131,584 = 257*512) Bytes from original firmware:

dd if=orig.bin of=tplink.bin skip=257 bs=512

You should transfer the firmeware image to the /tmp folder and revert back to original firmware (if availlable you can flash the firmware via the webinterface as well):

Via the safer method using sysupgrade:

sysupgrade /tmp/tplink.bin

Or you use the mtd method:

mtd -r write tplink.bin firmware

It is also possible to revert to the stock firmware using the method with tftp described in «TFTP install». (you still need the firmware images without the boot part).

OEM TP-Link firmware for the TL-WR841ND with the boot part removed or the original firmware if there wasn’t a boot part to revert to the original OEM firmware:

generic.failsafe

1. When the SYS led (under gear icon) starts to blink push the QSS/reset button for around 5-10 sec. Now the led should blink a lot faster than before.

1. Disconnect the router from the internet, connect it with a PC via RJ45 cable and perform a 30/30/30 restart

2. Change the ip on the PC to 192.168.1.2, subnet mask must be 255.255.255.0 and restart the router by unplugging the power cable

3. Perform a failsafe boot, quickly use

   telnet 192.168.1.1

If this didnt work check the ip adress on the PC or if you were too slow to connect during the failsafe mode. Still not working? Read this!

In telnet do the following things one after another:

• Define a password

  passwd

  enter

  yourpassword

  enter

  againyourpassword

  enter

• Kill the broken OWRT firmware

  mtd -r erase rootfs_data

  enter

  firstboot

  enter

  reboot -f

  After rebooting log in again just to check if the router is accessable. If you cant start again at the beginning.

Now change the network settings on the PC back to «Aquire IP adress automatically» and connect the router with the internet. Do a manual reboot by simply turning it off and back on again. The PC should now get an ip adress by DHCP. If this is the case you successfully resetted the router. If not repeat from the beginning or do this if you like.

Basically the router now works like after the initial flash to OWRT. Now you have to configure the internet connection and probably you want to install LUCI. After that open your browser, connect to 192.168.1.1 and log in with the data you entered via telnet.

Tested with the wr841n v9 with Linux OpenWrt-tplink 3.10.36 #1 Thu May 29 06:34:50 UTC 2014 mips GNU/Linux/ or better openwrt BARRIER BREAKER (Bleeding Edge, r40867) . The system supports multiple virtual access points.

Modify the files that follows according to your needs (and, in the case, search for the file definition here in the wiki to understand how it works)

config wifi-device  radio0
        option type     mac80211
        option channel  9 #same channel of the existing wifi network
        option path     'platform/qca953x_wmac'
        option txpower  12 #this depends on your needs, default is 20 dBm. Lower it is healthier (citation needed)
        # REMOVE THIS LINE TO ENABLE WIFI:
        #option disabled 1

config wifi-iface
        option device   radio0
        option network  lan
        option mode     ap
        option ssid     'This_is_a_new_wifi_network'
        option encryption       psk2 #wpa2 psk
        option key      'this_is_the_wifi_password'

config wifi-iface
        option device   radio0
        option network  wan
        option mode     'sta'
        option ssid     'This_is_the_name_of_the_existing_wifi_network'
        option encryption       psk2
        option key      'this_is_the_wifi_password_to_get_the_connection'

config interface 'loopback'
        option ifname 'lo'
        option proto 'static'
        option ipaddr '127.0.0.1'
        option netmask '255.0.0.0'

config globals 'globals'
        option ula_prefix 'here is written something, no need to modify it'

config interface 'lan'
        option ifname 'eth0'
        option force_link '1'
        option type 'bridge'
        option proto 'static'
        option ipaddr '192.168.11.1' ä modify this according to you needsfor the lan network
        option netmask '255.255.255.0'
        option ip6assign '60'

config interface 'wan'
        #option ifname 'eth1'
        option proto 'dhcp'

config interface 'wan6'
        option ifname '@wan'
        option proto 'dhcpv6'

config switch
        option name 'switch0'
        option reset '1'
        option enable_vlan '1'

config switch_vlan
        option device 'switch0'
        option vlan '1'
        option ports '0 1 2 3 4'

Pratically unchanged

config dnsmasq
        option domainneeded '1'
        option boguspriv '1'
        option filterwin2k '0'
        option localise_queries '1'
        option rebind_protection '1'
        option rebind_localhost '1'
        option local '/lan/'
        option domain 'lan'
        option expandhosts '1'
        option nonegcache '0'
        option authoritative '1'
        option readethers '1'
        option leasefile '/tmp/dhcp.leases'
        option resolvfile '/tmp/resolv.conf.auto'

config dhcp 'lan'
        option interface 'lan'
        option start '100'
        option limit '150'
        option leasetime '12h'
        option dhcpv6 'hybrid'
        option ra 'hybrid'
        option ndp 'hybrid'

config dhcp 'wan'
        option interface 'wan'
        option ignore '1'

config odhcpd 'odhcpd'
        option maindhcp '0'
        option leasefile '/tmp/hosts/odhcpd'
        option leasetrigger '/usr/sbin/odhcpd-update'

config dhcp 'wan6'
        option dhcpv6 'hybrid'
        option ra 'hybrid'
        option ndp 'hybrid'
        option master '1'

Pratically unchanged because the «client» wifi is connected to the «wan» interface, while the «repeater» wifi is connected to the lan interface, thus the firewall is basically already configured.

config defaults
        option syn_flood        1
        option input            ACCEPT
        option output           ACCEPT
        option forward          REJECT
# Uncomment this line to disable ipv6 rules
#       option disable_ipv6     1

config zone
        option name             lan
        list   network          'lan'
        option input            ACCEPT
        option output           ACCEPT
        option forward          ACCEPT

config zone
        option name             wan
        list   network          'wan'
        list   network          'wan6'
        option input            REJECT
        option output           ACCEPT
        option forward          REJECT
        option masq             1
        option mtu_fix          1

config forwarding
        option src              lan
        option dest             wan

Just be sure that the files are saved. To edit the files on windows, either use vi on the openwrt, check for a tutorial online, the basic commands are not difficult; or use winscp with a SCP connection and edit the files with an editor on windows. Then reboot the system and check for the wifi connection.

Remember that if the «client» wifi doesn’t work, won’t work also the repeater wifi network.

The default wireless configuration is different, for example
there is no: option path 'platform/qca953x_wmac‘ .
Further investigation shown that the wireless is able to provide an AP
if connected to whatever interface defined in /etc/config/network,
while for ‘sta’ mode (a wifi client) it is possible to obtain it only if
the interface connected to the wireless configuration is not using the bridge option nor having a relation to a switch with more than one port (for example if with eth0 we define a switch over multiple ports) Note: would be better to check this statement more thoroughly.

For example, with the configuration reported above for barrier breaker, the wlan is linked with the wan side, that is using no switch interfaces nor bridge protocol. This works too for 12.09.

1. Follow the instructions for installing WPS : See wps.options

2. Your ‘/etc/config/wireless’ file should be like that :

config wifi-iface
        option device 'radio0'
        option network 'lan'
        option mode 'ap'
        option ssid 'XXXXXXXXXXXXXXX'
        option key 'XXXXXXXXXXXXXXXXXXXXXXX'
        option wps_pushbutton '1'
        option wps_config 'push_button'
        option encryption 'psk2'

1. After reboot, if everything is ok, you can test with this command:

root@OpenWrt /root# hostapd_cli -p /var/run/hostapd-phy0 wps_pbc
Selected interface 'wlan0'
OK

1. Now, we can configure the WPS button on back on TL-WR841N to launch this command when we pressed it. Edit the file ‘/etc/hotplug.d/button/50-wps’

#!/bin/sh
# for debugging button name and action name, uncomment this 2 lines
#logger $BUTTON
#logger $ACTION

if [ "$ACTION" = "pressed" -a "$BUTTON" = "reset" ]; then
        for dir in /var/run/hostapd-*; do
                [ -d "$dir" ] || continue
                hostapd_cli -p "$dir" wps_pbc
        done
fi

If everything goes ok, you should see in Syslog not only the button events, but also succesful WPS authentication.

Read this howto to use buttons on TP-Link

Found in WR741ND wiki page and coppied. It works on WR841ND too.

(Thanks to obsy) Wifi toggle by QSS button
Simply create a new file called 01onoff in /etc/hotplug.d/button/

vi /etc/hotplug.d/button/01onoff

and copy these lines inside (remember to push ‘i’ for insert)

#!/bin/sh

[ "$BUTTON" = "wps" ] && [ "$ACTION" = "pressed" ] && {
 SW=$(uci get wireless.@wifi-device[0].disabled)
 [ $SW == '0' ] && uci set wireless.@wifi-device[0].disabled=1
 [ $SW == '0' ] || uci set wireless.@wifi-device[0].disabled=0
 wifi
}

Save and exit

(esc :wq)

Getting serial console is pretty standard fare. You need a MAX323 or similar level-shifter. The pinout on the router is RX — TX — GND — +5V (Power connector).

If you do not have serial port on your PC, use Nokia CA-42 data USB cable.

• For TP-LINK WR841ND V7.2 power conector (+5V) is ignored, just connect RX — TX — GND and router power cord, work fine…

• My TP-LINK WR841ND V7.2 has a VCC of +3.3V and like the TL-MR3420 http://wiki.openwrt.org/toh/tp-link/tl-mr3420#serial needed to connect a 10k pullup resistor between the TX and the 3.3V pin to get reliable serial:

• My TP-Link WR841ND V7.1 also requires the 10k pullup resistor between TX and the 3.3V pin. Without the resistor I just get garbage when I type, but can see some console output.

• just swap TX and GND pin in serial and no garbage in serial console, but this is read-only.

• For my TP-Link TL841N v9.0 i had to remove R26. It’s a pull-up between RX (device side) and VCC. My ftdi device couldn’t send data with R26 attached.

• For my TP-Link TL-WR841ND v8.4 was not required 10K resistor. My TTL to RS232 converter has bad marking of Tx and Rx pins. So, it was necessary to connect Tx-Tx and Rx-Rx. The connection of Vcc (3.3V) was necessary too. The connection scheme you can find on the following image:

Tip: Connecting TL-WR841N v8.1 via Arduino Due R3 ( forum link):

After connecting, you will be greeted by something like this:

AP93 (ar7240) U-boot
DRAM:  
sri
#### TAP VALUE 1 = 9, 2 = 9
32 MB
id read 0x100000ff
flash size 4194304, sector count = 64
Flash:  4 MB
Using default environment

In:    serial
Out:   serial
Err:   serial
Net:   ag7240_enet_initialize...
No valid address in Flash. Using fixed address
: cfg1 0xf cfg2 0x7014
eth0: 00:03:7f:09:0b:ad
eth0 up
No valid address in Flash. Using fixed address
: cfg1 0xf cfg2 0x7214
eth1: 00:03:7f:09:0b:ad
ATHRS26: resetting s26
ATHRS26: s26 reset done
eth1 up
eth0, eth1
Autobooting in 1 seconds

You now have one second to enter «tpl» (without the quotes) to get to the Uboot console prompt.

Near the two biggest capacitor you could see a HE10 connector with 14 pin (V8).

For JTAG interface you need VCC. You could take it on the TP1 point test.

This violates regulatory requirements

Edit the file /etc/config/wireless

1. Below config ‘wifi-device’ ‘radio0’ add

   option 'noscan' '1'

2. option ‘htmode’ should be set either to HT40+ or HT40-(HT40+ wont work with Channel 11)

   option 'htmode' 'HT40+'

Forum member pepe2k made a modification of U-Boot 1.1.4 for Qualcomm Atheros SoCs based devices (the project is still being developed, so new devices and SoCs will be supported in the future). Up to date information, binary images and sources can be found on official GitHub repository.

This modification started from wr703n-uboot-with-web-failsafe project, but supports more devices, all modern web browsers, has a lot of improvements and other modifications (like U-Boot NetConsole, custom commands, overclocking possibilities etc.).

More information:

• An article (in Polish) about one of the first version of this project on www.tech-blog.pl

Tested on WR841n_v5.1

Attention. Firmware of TP-Link TL-MR 3420 is coming to WR841ND v7.2 — verified. (OpenWrt Firmware Attitude Adjustment (r28380) / LuCI Trunk (trunk+svn7612))
But working usb port has not been verified. Probably enough to use this firmware, but do not compile a new one

Overview of the board:

Soldering (wire with red accent means D+). R185 and R183 can be shorted then D+/D- will appear in J1.

To get working USB the new firmware build is required. Files to edit are listed below:

1. Edit file target/linux/ar71xx/files/arch/mips/ar71xx/mach-tl-wr841nd.c

    Add line #include "dev-usb.h" after line #include "dev-leds-gpio.h"
    Add line ar71xx_add_device_usb(); before line ar71xx_add_device_mdio(0x0);

2. Edit file target/linux/ar71xx/files/arch/mips/ar71xx/setup.c

   Add line ar71xx_pll_wr(0x08, 0x00001030); before line ar71xx_detect_mem_size();

3. Edit file target/linux/ar71xx/files/arch/mips/ar71xx/Kconfig:

config AR71XX_MACH_TL_WR841N_V1
        bool "TP-LINK TL-WR841N v1 support"
        select AR71XX_DEV_M25P80
        select AR71XX_DEV_PB42_PCI if PCI
        select AR71XX_DEV_DSA
        select AR71XX_DEV_GPIO_BUTTONS
        select AR71XX_DEV_LEDS_GPIO
        select AR71XX_DEV_USB
        default n

For newer version of trunk (as of 2013 March)
1.Edit file target/linux/ar71xx/files/arch/mips/ath79/mach-tl-wr841n.c

    Add line #include "dev-usb.h" after line #include "dev-leds-gpio.h"
    Add line ath79_register_usb(); after line ath79_register_eth(0);

2. Edit file target/linux/ar71xx/generic/profiles/tp-link.mk, add packages in the definition of TLWR841 as following.

define Profile/TLWR841
	NAME:=TP-LINK TL-WR841N/ND
	PACKAGES:=kmod-usb-core kmod-usb2 kmod-ledtrig-usbdev
endef

i.e L7805 with 470uF and 100uF can be used to obtain 5V from the stock power supply.

NOTE: in case of v5.1 sections for WR741N instead of WR841N_V1 have to be edited (Kconfig, mach-tl-wr741nd.c).

tested with WR841 v7.1 and trunk revision 30430. New patch for rev. 32461 available

Hardware mod is on pictures, nothing changed.

Kernel mod is different, because new kernel version is released in revision 30430.

Here is patch for kernel 3.3: http://mysicka.ics.muni.cz/openwrt/usb-patch-final.patch

Apply this patch and build…

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