Joined: 26 Jan 2008 Posts: 13049 Location: Behind The Reset Button
Posted: Thu Apr 16, 2009 23:44 Post subject: WRT300 V1.1 - Jtag port confirmation
Greetings...
I just bought a wrt300n v1.1 refurb. Probably one that someone here bricked and brought it back
I fired it up to make sure is is not DOA and it works.
Next step is to take it apart.
Before I mess with it, it is my practice to back it up via jtag. In reading some old posts in regards to support for this device, I read that the jtag port was a tiny 12 pin port. In the pic, that would be JP1.
I also read that JP2 was confirmed to be the jtag port. However, JP2 is a 5 pin port on the normal 0.100 spacing. I believe that JP2 would be the serial port.
JP3 on the other hand, looks like a normal linksys jtag port. It is on 0.100 spacing, pins 2-12 are ground, and pins 1-11 have SMC resisters present.
I'm asking cause JP3 holes are filled with solder so it is a bit of work to clean'em up to get the header put in so I don't want to do that work to find out JP2 (the 5 pin) is really the jtag header (which also needs cleaning up).
Any confirmation would be appreciated. _________________ [Moderator Deleted]
Joined: 04 Jan 2007 Posts: 11563 Location: Wherever the wind blows- North America
Posted: Thu Apr 16, 2009 23:53 Post subject:
JP3 is most likely your JTAG. JP2 is serial. JP1????
[EDIT] - it could also be that you have 2 JTAG ports...one is for the flash chip...the other is for the radio chip....I remember Eko saying that there are 2 JTAGs on some units. You can program the radio separately....I guess....don't know how or why though.
redhawk _________________ The only stupid question....is the unasked one.
Joined: 26 Jan 2008 Posts: 13049 Location: Behind The Reset Button
Posted: Thu Apr 16, 2009 23:59 Post subject:
Thanks Red... Are you sure or are you putting 2 + 2 together (like me)? Following the traces, it looks like it is going to a broadcom 4321. I read somewhere that is the radio processor.
Joined: 26 Jan 2008 Posts: 13049 Location: Behind The Reset Button
Posted: Fri Apr 17, 2009 0:32 Post subject:
Red... This is one of the old threads that say JP1 is the jtag port.. However, it's hard to follow..
That's a little f$cking port... I assume the pins are the same, just tiny. Maybe I won't worry about it till I brick it
Joined: 04 Jan 2007 Posts: 11563 Location: Wherever the wind blows- North America
Posted: Fri Apr 17, 2009 1:42 Post subject:
barryware wrote:
Thanks Red... Are you sure or are you putting 2 + 2 together (like me)? Following the traces, it looks like it is going to a broadcom 4321. I read somewhere that is the radio processor.
Donno... That's why I'm asking.
No...I am not 100% sure...and judging from that thread the JP1 is the Flash chip JTAG. The printout of JTAG dialog on JP1 is pretty convincing.
I would say that I had it backwards....JP1 is Flash JTAG...and JP3 is for the radio chip.
I say...lets get a header on there...and get a printout of the dialog....to be sure.
redhawk _________________ The only stupid question....is the unasked one.
Joined: 26 Jan 2008 Posts: 13049 Location: Behind The Reset Button
Posted: Fri Apr 17, 2009 1:54 Post subject:
$hit... I don't have any of those headers.. Maybe I'll solder in pins.
I could order a header or 10, but the damn shipping is more than the parts. I gotta measure the centers of the holes so I know what to get.
I got it running dd-wrt. The install was painless so maybe I won't worry about it for now.
It's a nice router.. The only thing that would make it 100& would be to have removable antenna's but they are fixed.
Getting it apart was a bitch.. It took a minute or two to figure it out without breaking anything.
The wife is gone all next week so I got something to do now.
Incase anyone is interested... E-Cost.com has these for 39 bucks. They are refurb's but it came in a linksys box with a big refurb sticker on it. So it is factory serviced, not used (you know what I mean).
I wonder which member of this community bricked it and returned it. _________________ [Moderator Deleted]