Question about NetGear WGR614 Wireless Router

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I am trying to change the cfe on my netgear wgr614 V6 tdc but the jtag doesn't see it. The ends I am trying to get to is putting dd-wrt on it. Any ideas?

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  • Norman Skinner
    Norman Skinner Mar 14, 2011

    I don't wanna talk to the OS on it, I wanna change the CFE so that I can change the whole works, but this router's set so that any flash has to have a certain checksum and signature or it won't take the flash, thus I need to jtag it. The serial interface is useless.

  • Norman Skinner
    Norman Skinner Jun 21, 2011

    That router requires 1 4 resistor pack and another single resistor to be added to the circuit before the jtag will work, and the jtag has to be soldered to specific pads on the board.
    I can't explain the process without pictures.



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Once you've got a serial console attached you can access the CFE which is a bit like the bios of the WGT634U. Start up minicom and apply power to the router while holding Control C. You should see something like the following:

CFE version 1.0.34 for BCM95365R (32bit,SP,LE)
Build Date: Tue Feb 24 03:21:41 CST 2004 (root@jackylinux)
Copyright (C) 2000,2001,2002 Broadcom Corporation.

Add MAC client version(DNI).
Initializing Arena.
Initializing Devices.
et0: Broadcom BCM47xx 10/100 Mbps Ethernet Controller
CPU type 0x29007: 200MHz
Total memory: 0x2000000 bytes (32MB)

Total memory used by CFE: 0x81BB1280 - 0x82000000 (4517248)
Initialized Data: 0x81BB1280 - 0x81BB3E90 (11280)
BSS Area: 0x81BB3E90 - 0x81BB45D0 (1856)
Local Heap: 0x81BB45D0 - 0x81FB45D0 (4194304)
Stack Area: 0x81FB45D0 - 0x81FB65D0 (8192)
Text (code) segment: 0x81FB65E0 - 0x81FFFFB0 (301520)
Boot area (physical): 0x01B70000 - 0x01BB0000
Relocation Factor: I:E23B65E0 - D:01BB0280

configure vlans
*********************** VLAN Driver initial ********************
Process LAN port(2-5) vlan Architecture...
SUCCESS: trying to create VLAN 0 for switch
SUCCESS: trying to add LAN port

Process WAN port(2-5) vlan Architecture...
SUCCESS: trying to create VLAN 0 for switch
SUCCESS: trying to add WAN port
SUCCESS: enable ports success
configure vlans...done
Automatic startup canceled via Ctrl-C
Now you can get a listing of the available commands by typing "help". If you want to boot a kernel from a tftp server do the following:

CFE> ifconfig eth0 -addr= -mask=;
CFE> boot -z -elf -tftp
Or you can automate the process by setting STARTUP using:

CFE> setenv -p STARTUP "ifconfig eth0 -addr= -mask=;boot -z -elf -tftp;boot -elf flash0.os:"
The router will now try and retrieve a kernel image called vmlinux.gz using tftp from If this fails it will go ahead and boot the kernel on the flash. The is quite handy as in conjuction with a NFS root, it means you can do all your development without modifing the original firmware.

Posted on Mar 14, 2011


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