Issue with zjtag over modem tg784n using tiao multicontrol

This site is best viewed in a modern browser with JavaScript enabled.

Issue with zjtag over modem tg784n using tiao multicontrol

[deleted]

Hi everyone , i am trying to jtag a thomson tg784n with tiao multicontrol board , and i am using zjtag but i have some issues here , and maybe someone here have some experience with this and could give me some help .
I am receiving that cpu id was not found , with a value of "11111....." like in this next picture :

Brjtag it looks that is not compatible with this interface :

the pinout jtag i used was this one :
http://www.dd-wrt.com/phpBB2/viewtopic.php?t=148808&sid=040240bff15a40e7742c34a93e28d2cb
anyone have an idea how to solve this issue ?
thanks

TheOne

Hi, did you try the delay flag?

[deleted]

thanks for the reply on this .
No i did not .
What do you suggest ?

[deleted]

unfortunately brJTAG does not support TUMPA/TUMPA-Lite products
you can try /L1:5 and /delay:100 flags with zJTAG
thanks

[deleted]

ok , thanks , ill give it a try .
I will post here the results

[deleted]

Got the same result , it is stuck at 11111
i am posting some pictures to you all get an idea .
zjtag picture :

Modem and Tiao inter-connected

anymore ideas how to get this thru ?

[deleted]

please have a look at troubleshooting steps:
http://zjtag.osdn.jp/troubleshooting.php

[deleted]

This is not bad soldering or whatever the troubleshooting says .
As soon as i start the modem i get all pins at 3,3V , then i thought that trst must be at connected at GND , i did it and the rest of the pins are at 3,3V , and by this result the jtag says that the result is 1 and can not read the cpu code to identify it .
This must be another trick that i am missing .
This is not the only model i have , i have other exact model of this modem that is giving me the same results .
I have a blackcat usb also , and that card give me different results , in every reading gives me different different cpu codes , and then after one point says the same thing as tiao witch is cpu code FFFFFF .
So , this is definitely some thing i am missing , i have serious doubts that this modem can only be jtaged with the parallel port jtag interface like that user did in ddwrt forum .

[deleted]

IMO, you can benefit from one's experience in DD-WRT/openwrt forums.
we do not have tg784n modem to test it.

[deleted]

gonna send you a private message

surrealiz3

Hi Pedro
i know the timing is tight for the tools to detect this BCM modem , I mean the connection must occur right after power on , some seconds ...
I was not able to use zjtag for this because of linux version problems , but with the tumpa I connected urJtag and openocd successfully ...
for urjtag I had to use the libftd2xx drivers , and paste this on console some 2 / 3 seconds after power on :

cable  FT2232  VID=0x0403 PID=0x8a98
endian big
detect

after detection extended jtag can be enabled , and the dump

initbus ejtag_dma
print
detectflash 0x1E000000 
readmem 0x1E000000 0x02000000 dumptg784-2.bin

for openocd some adjustments need to be made to the cfg files
if you are still after this , reply for further impressions exchange
Bye