Page 1 of 2
WANTED : JTAG Access, Dead or Alive!
Posted: Fri Oct 14, 2011 10:03 pm
by erdem_ua
I wanted to have JTAG access to our TV boards, dead or alive...
It's been here from old days. I remember JTAG on B series boards and we do nothing with it...
Today I bricked my TV again and I this time I don't have any trick to solve this issue. Probably my board gonna replacement.
But I noticed there is a JTAG port on the board.
Since board is ARM board, I believe we have something that we can with this port.
At least we could learn precious information from this port.
Also this leads our TVs un-brickable.
Person who give valuable information about JTAG control of our TVs, including B/C and D series will be rewarded...
Re: WANTED : JTAG Access, Dead or Alive!
Posted: Sat Oct 15, 2011 8:05 am
by juusso
Re: WANTED : JTAG Access, Dead or Alive!
Posted: Mon Oct 17, 2011 1:00 pm
by juusso
http://www.olimex.com/dev/arm-jtag.html
Code: Select all
FEATURES
Parallel port JTAG dongle interface, can be used with all ARM devices for programming and debugging.
uses ARM's standard 2x10 pin JTAG connector
no need for external power supply, all power is taken from the target board, supports targets working with 3.0-3.6 V
dimensions 50x40 mm (2x1.6") + 20 cm (8") cable
Soft and schematics are there.
Also some hints on this forum.
http://electronix.ru/forum/lofiversion/ ... 71918.html
Firmware for jtag, at bootom you`ll find info about wiggler and jtag...
http://www.hjtag.com/download.html
Re: WANTED : JTAG Access, Dead or Alive!
Posted: Mon Oct 17, 2011 10:17 pm
by erdem_ua
I pictured D Series JTAG port also.
I am gonna build a wiggler cable.
But a person who are familiar with JTAGing will help much.
Thanks.
Edit:
After inspecting JTAG thing much, I started to became familiar with it...
I believe, TV could be revived.
Since we have ARM cpus, I believe it's not needed to hard task.
I just handle my old old ADSL router, USRobotics 9105... Just open it's inside, inspected what it have. Located serial port and also JTAG port and I made connection from jtag...I cannot read/flash it's program but I can read CPU ID at least...
But this doesn't work on TV. Might be due Arduggler (Arduiono Wiggler) device... Don't know why exactly. I think TV as simply ARM7 platform, doesn't it?... Might, programs for Samsung telephone (uses JTAG protocol) work for TV board too. I have no any experience on ARM JTAGing. Also some pricey cables sold for the job from $150... But this datasheets give hopes for JTAG interface
http://tinyurl.com/67m2mos
Re: WANTED : JTAG Access, Dead or Alive!
Posted: Fri Nov 04, 2011 12:07 pm
by erdem_ua
I build but board not responded. TDO is HIGH all the time. Don't know why.
Re: WANTED : JTAG Access, Dead or Alive!
Posted: Thu Nov 24, 2011 1:42 am
by nostromo1983
Re: WANTED : JTAG Access, Dead or Alive!
Posted: Sat Dec 17, 2011 3:06 am
by erdem_ua
Thanks for info, I tried some parallel port dongles and they doesn't work. Changed the MB.
Re: WANTED : JTAG Access, Dead or Alive!
Posted: Sun Dec 18, 2011 12:04 am
by juusso
just bought
this...
Don`t know how long does it take until adapter arrives.
Is there any other contacts for jtag except those one line (why not two???) on D6000board needed, Erdem? IMO - no, but might i`m wrong.
Re: WANTED : JTAG Access, Dead or Alive!
Posted: Sun Dec 18, 2011 11:41 pm
by erdem_ua
They are just required pins for good connection.
Jtag is not standardized, so you also needed to adjust pin connections by hand. Don't expect if socket fit that holes.
