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

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From: Craig Comstock <craig_comstock@yahoo.com>
To: "baseband-devel@lists.osmocom.org" <baseband-devel@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