[NBLUG/talk] JTAG hacking
Glenn Kerbein
glenn at spontaneousdancing.net
Sat Apr 14 09:33:14 PDT 2012
Hello,
I'll have to track down a computer with a parallel port.
However, I would really prefer to have a serial JTAG connector - a USB
one would be *amazing*. Most of the ones I've found are from shady xbox
hacking sites. Most of the tutorials and software used are
Windows-specific; anyone know where I can find a decent (preferably
cheap) JTAG connector? Anyone know of any JTAG software for Linux?
I appreciate all the help, people!
On 04/14/2012 08:19 AM, Mitch Patenaude wrote:
> I haven't done any JTAG hacking myself, but If I recall correctly, that
> DB25 cable you're talking about is parallel, not serial, so a DB9 serial
> converter won't help you. I also recall that hardware hackers say that
> having a parallel port on the motherboard is invaluable, since the
> USB<->Parallel converters don't work in this situation. If you don't
> have a parallel port, just invest in the more expensive USB JTAG device
> (or borrow, if you're just going to use it once.)
>
> -- Mitch
>
> On Fri, Apr 13, 2012 at 10:43 PM, Glenn Kerbein
> <glenn at spontaneousdancing.net <mailto:glenn at spontaneousdancing.net>> wrote:
>
> 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
> <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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