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Linksys WRT54G v4.0
Linksys WRT54G
Wireless-G Broadband Router

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WRT54G v4

dd-wrt

Linksys WRT54G v4.0

OpenWRT

Linksys WRT54G

Tomato

Yes

TomatoUSB

Yes

Gargoyle

Install Guide

NOTE: Requires K2.4, Do not flash anything else.
NOTE: During configuration or flashing a device, the only that should be hooked to the device is the computer and power.

Works well as a main router (gateway), will also work as a client, client bridge, repeater, repeater bridge.

Specs

Platform

Serial Num. = CDFA
FCC ID = Q87-WT54GV40
CPU Type = Broadcom BCM5352EKPB (BCM5352 chip rev 0 SoC)
MIPS Rev = ?
CPU Speed = 200MHz
Bus = ?
Flash Type = Parallel
Flash Chip = Intel TE28F320 C3BD90 A4297351 (Intel 28F320C3)
Flash Size = 4MB
Max Firmware Size = 3801088 bytes
RAM Size = 16MB
RAM Chip = hynix 522A HY5DU281622ET-J
nvram Size = 32kb
Switch = Broadcom BCM5352EKPB (Integrated)
Port-based vlan = Yes - via GUI and nvram
802.1q vlan = ?
Ethernet Port Count = 1-10/100-WAN 4-10/100-LAN
Wired Standard = IEEE 802.3/3u
boot_wait = ?
bootloader = ?
Flash Card Socket/Type = No
SD/MMC Mod Support = ?
MiniPCI slots = No
PoE = No
Power = 12V/.5A
Color of LEDs = ?
Size = 7.32" x 1.89" x 6.06"
USB = No
Serial Port = Yes
JTAG Port = Yes
Supported by TJTAG/Version = Yes/3.02
Supported by dd-wrt as of = ?
dd-wrt K2.4 Support = Yes
dd-wrt K2.6 Support = No
Special Features = ?

Radio (wl0)

Wireless Radio = Broadcom BCM2050KML
WLAN DSP processor = Broadcom BCM5352EKPB (BCM5352 chip rev 0 SoC)
Antenna Connector Type = RP-TNC External Removable
Wireless Standard = IEEE 802.11b/g
WiFi Operating Frequency = 2.4GHz
 802.11g = 6, 9, 12, 18, 24, 36, 48, 54Mbps
 802.11b = 1, 2, 5.5, 11Mbps
Radio cor_rev = 9
Radio Capabilities = ap sta wet led wme 802.11d 802.11h rm cqa mbss4
                     afterburner acktiming

Flashing

WARNING: Only DD-WRT v23 and newer will run on this model. If you use an older version, you will need to Recover from a Bad Flash.

The stock firmware from Linksys on the WRT54G v4 won't accept a firmware image over 3MB in size (you will get the error: "Upgrade are failed!" if you try) so you will need to flash the mini version of DD-WRT onto the router BEFORE flashing any other versions.

  1. Read the peacock announcement found here: http://www.dd-wrt.com/phpBB2/viewtopic.php?t=51486
  2. Do a Hard reset or 30/30/30 on the router according to note 1 of the peacock announcement (30/30/30)
  3. Set a static IP on your computer to 192.168.1.7. Subnet mask should be 255.255.255.0.
  4. Connect the lan cable from your computer to a LAN port of your router. Make sure your router is plugged in. Nothing should be connected to your computer or the router except the lan cable between them. Turn your firewall and any wireless computer connections OFF.
  5. Power cycle the router (uplug the power from the router for 30 seconds and then plug it back in)
  6. Open your browser to 192.168.1.1 by putting that in the browser address window of your browser. You should open the linksys webgui and NOT a page that says Management Mode. If you see management mode, power cycle the router again.
  7. Leave the username blank and enter "admin" as the password
  8. Go to administration and firmware upgrade
  9. Navigate to the folder that you are using, and select dd-wrt.v24_mini_generic.bin
  10. Hit upgrade
  11. When you get a success, wait FIVE FULL minutes.
  12. If you don't get success, repeat from steps 6 up to this one. If you still don't get success, clear your browser cache. Try using a different browser as well, to navigate to 192.168.1.1.
  13. When you can access the dd-wrt webgui using a browser at 192.168.1.1, power cycle the router.
  14. When you can again access the dd-wrt webgui using a browser at 192.168.1.1, do another Hard reset or 30/30/30 on the router.
  15. At this point you can choose to put a different build on, depending on what you needs are.
  16. Reset your computer ethernet connection to auto IP and auto DNS
  17. Check for recommended builds here.

Upgrading

If dd-wrt is already on the router follow these instructions. If stock firmware is on the router follow the flashing instructions.

  1. Check for recommended builds here first.
  2. Set your computer to a static IP of 192.168.1.7. (or to whatever subnet the router is on) Disable all firewalls and security. Disable wireless on your computer and only have the router connected to the flashing computer by the ethernet cable between the two.
  3. Hard reset or 30/30/30 (If the router supports it, if not, reset to defults in the GUI) prior to flashing. Wait. Check for password page on re-login and change password.
  4. Flash firmware. You can use the webgui except if you have a belkin router. (For belkin use tftp.exe to flash)
  5. Wait...at least three minutes. Lights should return to normal. See important2, below. Failing to wait is how most people brick their routers.
  6. Do a power cycle of the router. (Unplug the cord, count to 30 and plug it back in.)
  7. Wait for the lights to return to normal usually about 2 minutes.
  8. Hard reset or 30/30/30 again (If the router supports it, if not, reset to defults in the GUI). Wait. Check for the password page and re-login to change the password. Then you can reconfigure your settings manually.
  9. Once configured set your computer back to autoIP and autoDNS.

Important1: This Hard reset or 30/30/30 works fine for Asus router, but you do have to power cycle after the reset.

Important2: After you flash the firmware, and before you do the hard reset, the router will be building some nvram settings. YOU MUST WAIT FOR THIS TO FINISH PRIOR TO DOING ANYTHING WITH THE ROUTER INCLUDING A HARD RESET. Usually, you can tell when this process is completed by the WAN light coming on, but it does take several minutes. Go have a beer. There are starting to be more and more people who BRICK their routers by not waiting until the nvram is rebuilt, PRIOR to doing a hard reset. YOU NEED TO WAIT!

Reverting

  1. Read the peacock announcement found here: http://www.dd-wrt.com/phpBB2/viewtopic.php?t=51486
  2. Do a Hard reset or 30/30/30 on the router according to note 1 of the peacock announcement (30/30/30)
  3. Set a static IP on your computer to 192.168.1.7. Subnet mask should be 255.255.255.0.
  4. Connect the lan cable from your computer to a LAN port of your router. Make sure your router is plugged in. Nothing should be connected to your computer or the router except the lan cable between them. Turn your firewall and any wireless computer connections OFF.
  5. Power cycle the router (uplug the power from the router for 30 seconds and then plug it back in)
  6. Open your browser to 192.168.1.1 by putting that in the browser address window of your browser. You should open the linksys webgui and NOT a page that says Management Mode. If you see management mode, power cycle the router again.
  7. Enter your username and password
  8. Go to administration and firmware upgrade
  9. Navigate to the folder that you are using, and select WRT54G_v4.21.1_fw.bin once you've unzipped it.
  10. Hit upgrade
  11. When you get a success, wait FIVE FULL minutes.
  12. When you can again access the Linksys webgui using a browser at 192.168.1.1, do another Hard reset or 30/30/30 on the router.
  13. Reset your computer ethernet connection to auto IP and auto DNS

JTAG/Serial Info

JTAG

JTAG Pinouts
nTRST   1o o2	GND
  TDI   3o o4	GND
  TDO   5o o6	GND
  TMS   7o o8	GND
  TCK   9o o10	GND
nSRST  11o o12  N/C

Using Universal JTAG Adapter

white    1o o2	 black
  red    3o o4	 GND
 blue    5o o6	 GND
green    7o o8	 GND
yelow    9o o10  GND
orange  11o o12  N/C
JTAG Recovery
  • /noemw /nocwd switches required
  1. Backup CFE x2 (Compare the files, they must match exactly or there is something wrong with your JTAG setup)
  2. Erase Wholeflash x2
  3. Flash CFE
  4. Unplug Power
  5. Unplug JTAG Cable

TFTP

  1. Set Rig ip static 192.168.1.10
  2. Plug network cable from rig to port 1
  3. Get TFTP ready, server ip - 192.168.1.1, Password - blank, file - dd-wrt.v24_mini_wrt54g.bin
  4. Plug in power
  5. As soon as windows says "connected" hit upgrade. May have to use a network hub to make sure windows is always connected.
  6. Hard Reset 30\30\30

Serial

Serial Pinouts
VCC  1 o o 2  VCC
TX1  3 o o 4  TX0
RX1  5 o o 6  RX0
N/C  7 o o 8  N/C
GND  9 o o 10 GND
Hyper terminal Setup in Windows XP
In Windows XP, Click Start Button - All Programs - Accessories - 
   Communication - HyperTerminal
Enter a name for the connection, Click ok
Choose com port you adapter is plugged into, Click ok
Set:
 Bits per second = 115200
 Data Bits = 8
 Parity = none
 Stop bits = 1
 Flow control = none
Click ok
Click File - Save As, and select a place to save it to so you 
             don't have to enter the settings again.
Putty Setup in Windows XP
After installing putty, run it
 Serial line = The COM port your using for serial (ie. COM3)
 Speed = 115200
Click on Serial under Connection
 Serial line to connect to = same as above (Serial line)
 Speed (baud) = 115200
 Data bits = 8
 Stop bits = 1
 Parity = None
 Flow control = None
Click Session
 Enter a name for your connection under saved sessions
Click Save
Click Open
Serial Recovery

Modified Redhawk0 instructions

  1. Connect Serial cable
  2. Start one of the programs from above
  3. Get TFTP ready with file selected
  4. Use dd-wrt.v24_mini_wrt54g.bin
  5. Connect power to the router
  6. start a rapid fire Cntl-C as you plug the router to power
  7. type "nvram erase" w/o quotes, hit enter
  8. type "flash -noheader : flash1.trx" w/o quotes, this starts the tftp daemon, hit enter
  9. but have tftp.exe ready
  10. Click go or start on TFTP
  11. give it 5 minutes after it finishes
  12. then power cycle....hard reset...then config
  13. when it stops spitting out txt in the serial consol....hit the enter key...you should get a login prompt...at that point, power cycle it, Hard reset or 30/30/30...then config
  14. you'll see it boot up

vlan Info

Defaults

"/proc/switch/eth0" exists

1 2 3 4 | case labels
3 2 1 0 | nvram port numbers
root@DD-WRT:~# nvram show | grep vlan.ports
vlan1ports=4 5
vlan0ports=3 2 1 0 5*
size: 19872 bytes (12896 left)
root@DD-WRT:~# nvram show | grep port.vlans
port5vlans=0 1 16
port4vlans=0
port3vlans=0
port2vlans=0
port1vlans=0
port0vlans=1
size: 19872 bytes (12896 left)
root@DD-WRT:~# nvram show | grep vlan.hwname
vlan1hwname=et0
vlan0hwname=et0
size: 19872 bytes (12896 left)
root@DD-WRT:~# lsmod
Module Size Used by
ip_nat_pptp 2560 0 (unused)
ip_conntrack_pptp 3036 1
ip_nat_proto_gre 1664 0 (unused)
ip_conntrack_proto_gre 2584 0 [ip_nat_pptp ip_conntrack_pptp]
etherip 5104 0 (unused)
switch-robo 5356 0 (unused)
switch-core 6352 0 [switch-robo]
root@DD-WRT:~# ls /proc/switch
eth0
root@DD-WRT:~# cat /proc/switch/eth0/vlan/0/ports
0 1 2 3 5t*
root@DD-WRT:~# cat /proc/switch/eth0/vlan/1/ports
4 5t
root@DD-WRT:~# cat /proc/switch/eth0/vlan/2/ports
4
root@DD-WRT:~#

nvram commands

root@DD-WRT:~# nvram set vlan1ports="3 4 5"
root@DD-WRT:~# nvram set vlan0ports="2 1 0 5*"
root@DD-WRT:~# nvram commit
root@DD-WRT:~# reboot

nvram

Port 1 moved to WAN vlan

root@DD-WRT:~# nvram show | grep vlan.ports
vlan0ports=2 1 0 5*
vlan1ports=3 4 5
size: 19850 bytes (12918 left)
root@DD-WRT:~# nvram show | grep port.vlans
port5vlans=0 1 16
port3vlans=0
port1vlans=0
size: 19850 bytes (12918 left)
port4vlans=0
port2vlans=0
port0vlans=1
root@DD-WRT:~# nvram show | grep vlan.hwname
vlan1hwname=et0
size: 19850 bytes (12918 left)
vlan0hwname=et0
root@DD-WRT:~#

GUI

Port 4 moved to WAN vlan

root@DD-WRT:~# nvram show | grep vlan.ports
vlan1ports=4 5
vlan0ports=3 2 1 0 5*
size: 20005 bytes (12763 left)
root@DD-WRT:~# nvram show | grep port.vlans
port5vlans=0 1 16
port4vlans=1 18 19
port3vlans=0 18 19
port2vlans=0 18 19
port1vlans=0 18 19
port0vlans=1 18 19
size: 20005 bytes (12763 left)
root@DD-WRT:~# nvram show | grep vlan.hwname
vlan1hwname=et0
vlan0hwname=et0
size: 20005 bytes (12763 left)
root@DD-WRT:~#

Pictures

WRT54Gv40a WRT54Gv40b WRT54Gv40c

WRT54Gv40f WRT54Gv40g WRT54Gv40d

WRT54Gv40e WRT54Gv40h

FCC Pictures

Linksys WRT54G v4.0 FCCa Linksys WRT54G v4.0 FCCb Linksys WRT54G v4.0 FCCc

Linksys WRT54G v4.0 FCCd Linksys WRT54G v4.0 FCCe Linksys WRT54G v4.0 FCCf

Linksys WRT54G v4.0 FCCg Linksys WRT54G v4.0 FCCh Linksys WRT54G v4.0 FCCi

Linksys WRT54G v4.0 FCCj Linksys WRT54G v4.0 FCCk Linksys WRT54G v4.0 FCCl

Linksys WRT54G v4.0 FCCm Linksys WRT54G v4.0 FCCn Linksys WRT54G v4.0 FCCo

Linksys WRT54G v4.0 FCCp Linksys WRT54G v4.0 FCCq Linksys WRT54G v4.0 FCCr

Linksys WRT54G v4.0 FCCs Linksys WRT54G v4.0 FCCt Linksys WRT54G v4.0 FCCu

Linksys WRT54G v4.0 FCCv

Notes

Troubleshooting

  • If your router fails to reboot (power light doesn't stop flashing, no web interface, etc) you will need to Recover from a Bad Flash.

Hardware Modification


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