Hardware

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Linksys WRT54Gx

WRT54G/GL/GS versions

The first 4 digits in the serial number (look on the box or the underside of the router) represent the hardware revision:

CDF0 = WRT54G v1.0
CDF1 = WRT54G v1.0
CDF2 = WRT54G v1.1
CDF3 = WRT54G v1.1
CDF5 = WRT54G v2.0
CDF7 = WRT54G v2.2
CDF8 = WRT54G v3.0
CDF9 = WRT54G v3.1
CDFA = WRT54G v4.0
CDFB = WRT54G v5.0
CDFC = WRT54G v5.1
CDFD = WRT54G v6.0
CDFE = WRT54G v7.0

CL7A = WRT54GL v1.0
CL7B = WRT54GL v1.1

CGN0 = WRT54GS v1.0
CGN1 = WRT54GS v1.0
CGN2 = WRT54GS v1.1
CGN3 = WRT54GS v2.0
CGN4 = WRT54GS v2.1
CGN5 = WRT54GS v3.0
CGN6 = WRT54GS v4.0
CGN7 = WRT54GS v5.0
CGN8 = WRT54GS v5.1

CJK0 = WRTSL54GS v1.0

See more information on the LinksysInfo Autopsy page.

DD-WRT supports versions 1 - 6 of the WRT54G, WRT54GL and WRT54GS hardware. WRT54G(S) v5-v6 series are supported in v23 SP1 and above "micro" builds, but require you use a special flashing procedure (see 'flashing v5 - vxworks killing'). DD-WRT does not currently support the WRT-54GX, Linksys's MiMo version router. DD-WRT is also reported to work on the WAP54G, but your mileage may vary.

The WRT54Gv7 uses an atheros chip, runs VxWorks, and has 2MB/8MB ROM/RAM. It is not supported. If someone wants to donate a unit to db90h (mail jeremy@bitsum.com) he can work on it.

WARNING: v22 isnt compatible with v4 and newer routers and GL. They are different. Only v23 and newer will run on this model. You would otherwise have to 'un-brick' your router (Revival Guide method)

NOTE: Additionally the stock firmware from Linksys on the WRT54G v4 and WRT54GL won't accept a firmware image over 3MB in size (you will get the error: "Upgrade are failed!"(sic) if you try) so you will need to flash the mini version of DD-WRT onto the router BEFORE flashing the std or voip versions. (Remember to hold reset button for 30 sec after flashing mini version.)

The WRT54Gx Boot Process

NVRAM

NVRAM (non-volatile RAM) is the place where the permanent settings are stored. On the command line you can view the NVRAM's content with

nvram show

A variable is stored/changed by issuing

nvram set <variable_name>="<value>"
nvram commit

You'll need to reboot to get the (changed) NVRAM executed.

Overclocking

The standard clock speed of a WRT54G(S) v2-v6 is 200 MHz. DD-WRT allows overclocking the device to up to 300 MHz for v2-v3 and up to 250mhz for v4-v6. It is also possible to underclock, which may be useful for troubleshooting crashes which may be caused by overheating. Newer Linksys firmware overclocks some models of the WRT54GS to 216 MHz, to prevent instability issues inherent in the 2.x versions.

The WRT54G(S) v4-v6 and WRT54GL v1.x have a BCM3302 v0.8 processor instead of a BCM3303 v0.7 with previous models.

BCM3303 v0.7 clock freuqnecies: (todo...)

MIPS/CPU Backplane Comment


BCM3303 v0.8 clock frequencies:

MIPS/CPU Backplane Comment
183 91
188 94
197 98
200 100
206 103
212 106
216 108
217 109
225 113
238 119
240 120
250 125


For information on running a v4 series greater than the CFE imposed maximum of 250mhz, please see [Increased overclocking through CFE modifications] (technical).

Hardware Modifications

Hardware Modifications (mods) are not necessarily DD-WRT specific or compatible.

Serial Port
Additional external SMA-R connector
Dual Serial Port
SD-Card
Temperature sensor for WRT54G 2.x and WRT54GS with DS1820