3 Oct
2013
3 Oct
'13
4:57 p.m.
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?
4 Oct
4 Oct
5:08 p.m.
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(a)yahoo.com>
To: "baseband-devel(a)lists.osmocom.org" <baseband-devel(a)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?
25 Apr
25 Apr
5:36 p.m.
Hi Craig,
I got JTAG working (thanks to #osmocom!). I first recommend you get a C115
or C118 with JTAG exposed, which is much easier than having to remove the
shields. However remove the plastic cover which makes soldering GND, TDI,
TMS, TDO & TCK easier - be careful not to short them the surrounding
shields! You will see there is actually 8+9 pads, you must disregard the
pin that is left of CTS (it is not shown on
http://bb.osmocom.org/trac/raw-attachment/wiki/MotorolaC123/compal_testpads…).
Finally you need a proper VREF. As for me, I just connected the internal
3.3V (TP4) on my Flyswatter2 to the VREF, it appears to work fine (the
Flyswatter1 has a jumper that you can use to bridge VREF and 3.3V).
On Fri, Oct 4, 2013 at 5:08 PM, Craig Comstock <craig_comstock(a)yahoo.com>wrote;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(a)yahoo.com>
*To:* "baseband-devel(a)lists.osmocom.org"
<baseband-devel(a)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
19 May
19 May
1:59 p.m.
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(a)yahoo.com>wrote;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(a)yahoo.com>
*To:* "baseband-devel(a)lists.osmocom.org"
<baseband-devel(a)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
3632
days inactive
3860
days old
baseband-devel@lists.osmocom.org
3 comments
2 participants
participants (2)
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Christophe Devine -
Craig Comstock