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@@ -1,8 +1,8 @@ - openocd + OpenOCD - Free and Open On-Chip Debugging, In-System Programming - and Boundary-Scan Testing - Copyright (c) 2004, 2005 Dominic Rath + Free and Open On-Chip Debugging, In-System Programming + and Boundary-Scan Testing + Copyright (c) 2004, 2005, 2006 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 / @@ -11,39 +11,83 @@ system-on-chip solutions. User interaction is realized through a telnet command line interface and a gdb (The GNU Debugger) remote protocol server. -Initially, support for two JTAG TAP bus master interfaces with public hardware -schematics will be included, but support of additional hardware is an expressed -goal. - 1. JTAG hardware -Currently, openocd contains support for Wiggler-compatible paralell port -dongles and a USB interface based on the FTDI FT2232, called USBJTAG-1. -A new version of the USB interface, USB-JTAG v1.2, is available with complete -schematics (http://www.fh-augsburg.de/~hhoegl/proj/volksmikro/usb-jtag/050910/). +Currently, OpenOCD supports three types of 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 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. + +* 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. -It was tested using Amontec's (www.amontec.com) Chameleon POD in it's -Wiggler configuration, but homemade wigglers should work just as well. -In order to use the reset functionality (warm-reset, debug from reset, reset -and init), the choosen Wiggler has to connect the nSRST line. +* 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. -USBJTAG-1 is based on a FTDI DLP2232M module and a few additional parts. -Schematics are freely available. USB-JTAG v1.2 doesn't use the DLP2232M, but -has the FTDI chip soldered directly on the PCB. There are two drivers for these -modules implemented, one using the open source libftdi, the other using FTDI's -proprietary FTD2XX library. +* 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. + +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 cores: -- ARM7TDMI +- ARM7TDMI(-s) - ARM9TDMI +- ARM920t +- ARM922t +- ARM966e + +Support for Intel XScale CPUs (PXA25x, PXA27x and IXP4xx) is currently being +developed. + +The OpenOCD is only tested with little-endian targets, but support for +big-endian is planned. If you're interested in helping with this (and you +happen to have a big-endian ARM7/ARM9 system, feel free to contact +Dominic.Rath <at> gmx.de. + +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, x86-64-Linux and +(though it's not fully working yet) PowerPC OS-X. + +4. Documentation -Support for cores with MMUs (ARM720t, ARM920t) is currently being merged. +Documentation for the OpenOCD is hosted in the Berlios OpenFacts Wiki at +http://openfacts.berlios.de/index-en.phtml?title=Open_On-Chip_Debugger. -3. Licensing +5. Licensing -openocd is licensed under the terms of the GNU General Public License, see the +OpenOCD is licensed under the terms of the GNU General Public License, see the file COPYING for details. |