View source for Neo 1973 OpenOCD

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Return to Neo 1973 OpenOCD.

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About OpenOCD

OpenOCD is a 100% free software On-chip-debugger for commonly-found ARM JTAG probes such as wiggler, chamaeleon, jtag-key and others.

It provides a human-readable telnet interface for manually halting/resuming the target device, reading/writing registers and memory, etc.

In addition, it provides a RDI (remote debugger interface) on a TCP port. This interface can be used by gdb (the GNU Debugger).

The GTA01 development team uses OpenOCD with a wiggler compatible probe as their ICE solution.

Getting OpenOCD

Debian Package

We now have a Debian binary package of OpenOCD, available from Installing this package is the preferred method to install OpenOCD on your development machine like

dpkg --install openocd_82-1_i386.deb

Source Code

OpenOCD Revision 82 and later have been proven to work with our QT2410 and Neo1973 target board and wiggler as well as Amontect JTAGkey and JTAGkey tiny. You can e.g. check rev. 130 out of the OpenOCD subversion via

svn co -r 130


User:HaraldWelte has provided a openocd.cfg configuration file for use of OpenOCD with wiggler and the QT2410 target board.

Known Bugs

CP15 register read/write of ARM920T core not working

This has been reported upstream. Bugfix pending.

number of discovered devices in JTAG chain doesn't match configuration

You get something like:

Error:   jtag.c:1224 jtag_examine_chain(): number of discovered devices in JTAG chain (51) doesn't match configuration (1)

This seems like a libftdi initialization bug. Sometimes the FT2232 doesn't get completely reset into a sane state at startup of OpenOCD. Please unplug the USB cable from the Amontec JTAGkey / Debug Board and re-plug. It should immediately work the next time. Bugfix would be appreciated a lot!

OpenOCD and Debug Board


If you wan to use OpenOCD with our Debug Board v2, and want to use the serial port simultaneously with OpenOCD, you need libftdi-0.8 or later. Chances are high that your distribution still ships an earlier version of libftdi, so you might want to download it from and build yourself.


This is an openocd.cfg that is known to work with Debug Board, Neo1973 Hardware#GTA01Bv3 and OpenOCD 130:

telnet_port 4444
gdb_port 3333
interface ft2232
jtag_speed 0
ft2232_vid_pid 0x1457 0x5118
ft2232_layout "jtagkey"
reset_config trst_and_srst
jtag_device 4 0x1 0xf 0xe
daemon_startup attach
target arm920t little reset_run 0 arm920t
working_area 0 0x200000 0x4000 backup
run_and_halt_time 0 5000

Using OpenOCD telnet interface

The telnet interface can be accessed using

telnet localhost 4444

it provides a plethora of functions for debugging. You might be interested in

reset halt

Using OpenOCD and gdb for remote debugging


== Ope