c139/c140 jtag anyone?

Christophe Devine devinechristophe at gmail.com
Mon May 19 11:59:23 UTC 2014

Craig, I identified the pinout on the C139, it is somewhat different. On
the right, you have now: TX|DLPWR|CTS|RX|GND; this is the modem UART
+DLPWR. Irda and JTAG are removed. You can use DLPWR to automatically start
the phone by forcing it low. Btw on the C115/C118, you can use nSRST to
fully reset the board with a relay (to do so, you will need to modify a
battery as I explained in an earlier post). The modem UART is not really
necessary unless you plan on debugging the official firmware.

On Fri, Oct 4, 2013 at 5:08 PM, Craig Comstock <craig_comstock at yahoo.com>wrote:

> I cracked open the shield on my C139 and didn't see the TPs I expected
> from the schematic. I thought maybe the angle of the photo on osmocom hid
> the TPs but it really didn't.
> I'll try my C115 instead since that is more clear and accessible. Flashing
> hello_world on my C115 seemed to fail in a similar fashion as it does on my
> C139 so maybe the same issue exists there.
> I was wrong too... it was TP16 not TP6, so I found TP16 but still haven't
> located TP8 on the C139 schematic.
> -Craig
>   ------------------------------
>  *From:* Craig Comstock <craig_comstock at yahoo.com>
> *To:* "baseband-devel at lists.osmocom.org" <baseband-devel at lists.osmocom.org>
> *Sent:* Thursday, October 3, 2013 9:57 AM
> *Subject:* c139/c140 jtag anyone?
> I'm at the point w/ flashing firmware where I feel like I need to use a
> debugger w/ JTAG. I figured I could probably use serial line logging
> somehow but JTAG seems better and I should learn it anyway.
> Has anyone pried open the shield on a c139/c140 and tried attaching to the
> JTAG test points that are just inside the shield next to the test points
> which are accessible via the battery compartment?
> From what I can gather from the schematics:
> TDI - TP8
> TCK - TP17
> TDO - TP16
> TMS - TP18
> Looking at the board from the battery compartment side with the top of the
> phone pointing North/Up I see at least TP17 is near the right-hand bank of
> test points visible from the battery compartment. From left-to-right there
> I see something like: TP12, TP18?, TP16?, TP17 so it looks like I have two
> of the TPs I need: 17 and 18.
> I can't seem to find TP6 or TP8 anywhere on the schematic.
> -Craig
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