Guide for Jtag-Cable and acces to wgr614v8

13 posts / 0 new
Last post
domi-germany
domi-germany's picture
Guide for Jtag-Cable and acces to wgr614v8

                                       Guide for Jtag-Cable and acces to wgr614v8

HelloCool,

today i had enough time to write a tut. for you so here it is.

 Tjtag a wgr614v8 (and building a Jtag cable)

what you need :

  1. Some Cable
  2. 5x 100 Ohm Resistors
  3. 1x  DB25 plug
  4. Soldering iron and knowledge

so we can begin.

first  solder the resistor and cables like in the picture:

here is the pinout:

then take the last resistor and connect pin 1 from jtag to pin 1 from tjtag with this resistor.

so if you got this you are ready to jtag it.

if you have questions (how to tjtag etc) just ask me :)

actually i`m not successfull debricking my router :(

next weekend i`ll try again

 

greets dominic

 

Copyright is at me Wink

if you want to post it in other forums please ask me 

thanks

 

 

hpux735
hpux735's picture
So, have you tried this with

So, have you tried this with a JTAG program?

Did it work, were you able to scan the onboard flash?

I ask because I completely bricked one of my routers a while ago, and I'd like to rescue it.
http://www.myopenrouter.com/forum/thread/10720/Trying-to-add-GUI-in-Open...

I've mostly built a buffered JTAG parallel port adapter, but this one is much easier.
I'm very interested in building one off your plans if you verify that it works.

Thanks!
hpux735

domi-germany
domi-germany's picture
not yet :(

not yet :(
but if you need something fpr jtag i ahve the files to recover
i am going to sleep now
good night :)

greets dominic

achilles
achilles's picture
hi all,

hi all,
I have also prepared a JTAG cable and have tested with JTAG software avlbl at :
http://www.dd-wrt.com/dd-wrtv2/down.php?path=downloads%2Fothers%2Ftornad...

It works fine . I proceeded in the way specified by dominic but you also need to connect Vcc of your serial with Vcc of JTAG header to get it working ....

domi-germany
domi-germany's picture
sorry i have edited it :D

sorry i have edited it :D

greets dominic

dare
dare's picture
where is the 5th resistor

where is the 5th resistor
and what is X mark

dare
dare's picture
where did you put 5th

where did you put 5th resistor
and what is X mark

achilles
achilles's picture
Why would u use a fifth

Why would u use a fifth resistor .... Four will do as shown in the above figure ... may be by mistake it has been written in the above guide that 5 resistors are needed ... I have prepared the cable with 4 resistors and it works great ..
The X mark just indicates that instead of keeping pins 2,4,6,8,10 and 12 together we just need to keep 2,4,6,8 and 10 together ....
pin 12 shud be left unused ...
You may find following articles helpful ...
http://www.myopenrouter.com/article/10935/Creating-a-JTAG-Cable-For-WGR6...
http://www.myopenrouter.com/article/10951/How-To-Use-A-JTAG-Cable-To-Rec...
If you still need any info let me know ....

domi-germany
domi-germany's picture
it is needed here: " then

it is needed here: " then take the last resistor and connect pin 1 from jtag to pin 1 from tjtag with this resistor. "

greets

achilles
achilles's picture
hi domi..

hi domi..
I have used only four resistors in my cable ... though I have used a 100 ohm resistor to connect serial pin with JTAG header ....
I have tested n used this setup too ...
Could u plz clarify me regarding ur usage of 5th resistor ..

domi-germany
domi-germany's picture
oh well

oh well
in my "fall" dont know what it is in english
i needed the 5th one because of bad connection :S sometimes there where errors ....
dont know if it must be ;)

greets

_IRIX
_IRIX's picture
HI Guys, and thanks Domi for

HI Guys, and thanks Domi for sharing this whit us.

Has anybody succeeded with this operation by now?

I bricked my WGR-614v8 by uploading the wrong firmware.. actually I was experimenting :D
Now it's TOTALLY bricked and all I can see is ARP broadcast from the device.

_IRIX
_IRIX's picture
1. Some Cable

1. Some Cable
2. 5x 100 Ohm Resistors
3. 1x DB25 plug
4. Soldering iron and knowledge

Do I need really 5 or 4 resistors?