[NBLUG/talk] JTAG hacking

[Glenn Kerbein]

Hello,

Let me clarify. I did some more googling around. Apparently the JTAG 
connector turns into a DB25 serial cable. Further discussion with the 
engineer tells me that it is not "genuine" serial communication. I was 
hoping to find a DB25-DB9 converter (I'll scrounge for one, there's 
gotta be one somewhere). From the DB9, I'll feed that into a 
USB-to-Serial converter.

Hopefully I'll be able to use some JTAG-compatible program.

Then, SCIENCE!?

Still kinda at a loss here, and I'd appreciate any help in getting the 
right connectors and software.

Optimally, I wouldn't need to install additional software on there.

Best,
Glenn

On 04/13/2012 09:16 PM, Mark Street wrote:
> Hmmm,
>
> I am trying to picture that in my mind.. a huge serial cable. which
> piece do you need?... I have a JTAG unit that I use with my Globalscale
> Dreamplug devices, on which I run Debian Wheezy.
>
> USB off one end of the JTAG box to the computer and off the other end
> two small custom cables for the JTAG interface and UART interface of the
> tiny mobo. My Globalscale devices use UBoot.
>
> http://www.globalscaletechnologies.com/p-28-guruplug-jtag.aspx
>
>
>
> On 4/11/2012 6:45 PM, Glenn Kerbein wrote:
>> Good day NBLUG,
>>
>> I need some assistance with assessing the hardware on an embedded device.
>>
>> I have an motherboard that normally runs Linux (a variant of Debian,
>> but I can't be sure). If they operate normally, you can modify the
>> BIOS by flashing the SPI (whatever that is). If the device is broken
>> beyond repair, and the BIOS is to blame, then a new BIOS can be
>> flashed onto the board using a JTAG connector. I have one half of the
>> JTAG connector - I just need to figure out how to get the BIOS image
>> to talk over a huge serial cable.
>> The issue is that I don't have all the JTAG cabling, etc. to make this
>> work. I'm waiting on someone else to provide it to me.
>>
>> I was Googling around at JTAG. Most people use these connectors to
>> hack their xboxes. One person figured out how to bridge the serial
>> JTAG to a serial to female USB port.
>>
>> I know someone on this list posted that they have a bunch of xboxes.
>> Do you have any JTAG connectors for said xboxes?
>>
>> I appreciate any input you have!
>>
>> Best,
>> Glenn
>
>
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