OpenOCD



			 Free and Open On-Chip Debugging, In-System Programming 

						   and Boundary-Scan Testing

				  Copyright (c) 2004-2007 Dominic Rath



The debugger uses an IEEE 1149-1 compliant JTAG TAP bus master to access on-chip

debug functionality available on ARM7 and ARM9 based microcontrollers /

system-on-chip solutions.



User interaction is realized through a telnet command line interface and a gdb

(The GNU Debugger) remote protocol server.



1. JTAG hardware



Currently, OpenOCD supports the following JTAG interfaces:



- Parallel port wigglers. These devices connect to a PC's parallel port,

providing direct access to the JTAG lines. The OpenOCD contains descriptions

of a few Wiggler layouts, including the original 'Wiggler' design. Other

layouts (i.e. mapping of parallel port pins to JTAG lines) can be added easily.

Typical Wiggler speeds are around 12kByte/s code download to an ARM7's RAM.



The list of supported parallel port devices includes:



  * Macraigor Wiggler JTAG cable

  * Gateworks GW16012 JTAG programmer

  * Xilinx DLC5 JTAG parallel cable III

  * Ka-Ro TRITON starterkit II JTAG cable

  * Lattice parallel port JTAG cable

  * ST FlashLINK programming cable



- The Amontec JTAG Accelerator. This is a configuration for Amontec's Chameleon

dongle, a parallel port interface based on a Xilinx CoolRunner CPLD. It uses

the IEEE1284 EPP parallel port specification, providing many times the

performance achievable with wiggler-style devices. Additional information is

available on www.amontec.com.

Typical JTAG Accelerator speeds are around 120-160kByte/s to an ARM7's RAM.



- FTDI FT2232 based USB devices. The FT2232 (but not FT232 or FT245) features a

multi-protocol synchronous serial engine (MPSSE) that can be used to run the

serial JTAG protocol. There are several implemenations of FT2232 based devices:



* USBJTAG: http://www.fh-augsburg.de/~hhoegl/proj/usbjtag/usbjtag.html

The USBJTAG was designed by Prof. Hubert Hoegl to provide a high-speed USB

interface for use with the OpenOCD. Schematics are available at the USBJTAG

website, and a homebrew device can easily be built using the FTDI evaluation

module DLP2232M.



* OOCD-Link: http://www.joernonline.de/dw/doku.php?id=en:projects:oocdlink

Similar to the USBJTAG, this design comes with free schematics, too.



* Amontec JTAGkey: www.amontec.com

The Amontec JTAGkey offers support for a wide variety of target voltages from

1.4V to 5V. It also allows the JTAG lines and reset signals to be tri-stated,

allowing easy interfacing with a wide variety of targets.



* Amontec JTAGkey-Tiny: www.amontec.com

The Amontec JTAGkey offers support for a wide variety of target voltages from

2.8V to 5V. It also allows the reset signals to be tri-stated, allowing easy

interfacing with a wide variety of targets.



* Olimex ARM-USB-OCD: www.olimex.com

The Olimex ARM-USB-OCD offers support for a wide vriety of target voltages from

2.0V to 5V. It also allows targets to be powered from the ARM-USB-OCD and

features and additional RS232 UART.



* eVerve Signalyzer: www.signalyzer.com

The Signalyzer offers support for a wide variety of target voltages from 1.2V to

5.5V. A second connector provides access to a TTL level UART.



* TinCanTools 'Flyswatter' USB JTAG programmer.



* Turtelizer 2: http://www.ethernut.de/en/hardware/turtelizer/index.html

Another USB JTAG programmer, with freely available schematics. It supports

target voltages from 1.65V to 5.5V.



* Hitex STR9-comSTICK: http://www.ehitex.de/p_info.php?products_id=292

A STR912FW44x microcontroller "board" with USB and JTAG functionality.



* Luminary Micro development board evb_lm3s811 JTAG interface.



* ASIX PRESTO: http://www.asix-tools.com/prg_presto.htm

The ASIX PRESTO is a USB JTAG programmer for a wide range of components, e.g.

microcontrollers, serial EEPROM and Flash memory chips, CPLDs and others.



* usbprog: http://www.embedded-projects.net/index.php?page_id=165

The usbprog is a freely programmable USB adapter, which can (among other

things) use a firmware which turns it into a JTAG programmer/debugger.



All FT2232 based devices may be accessed using either FTDI's proprietary FTD2XX

library (www.ftdichip.com) or using an open-source replacement from

http://www.intra2net.com/de/produkte/opensource/ftdi/index.php, also included

with many Linux distributions.



2. Supported cores



This version of openocd supports the following ARM7/9 cores:



- ARM7TDMI(-s)

- ARM9TDMI

- ARM920t

- ARM922t

- ARM926ej-s

- ARM966e

- Cortex-M3



Support for Intel XScale CPUs is also included:



- PXA25x

- PXA27x

- IXP42x



And support for the Marvell Feroceon CPU core as found in the

Orion SOC family is included as well.



3. Host platforms



OpenOCD was originally developed on x86-Linux, but has since then been ported

to run on Windows/Cygwin, native Windows with MinGW, FreeBSD, IA64-Linux,

AMD64-Linux, Alpha-Linux, ARM-Linux, and PowerPC OS-X.



4. Documentation



Documentation for the OpenOCD is hosted in the Berlios OpenFacts Wiki at

http://openfacts.berlios.de/index-en.phtml?title=Open_On-Chip_Debugger.



5. Licensing



OpenOCD is licensed under the terms of the GNU General Public License, see the

file COPYING for details.