50 lines
1.9 KiB
Plaintext
50 lines
1.9 KiB
Plaintext
openocd
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Free and Open On-Chip Debugging, In-System Programming
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and Boundary-Scan Testing
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Copyright (c) 2004, 2005 Dominic Rath
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The debugger uses an IEEE 1149-1 compliant JTAG TAP bus master to access on-chip
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debug functionality available on ARM7 and ARM9 based microcontrollers /
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system-on-chip solutions.
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User interaction is realized through a telnet command line interface and a gdb
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(The GNU Debugger) remote protocol server.
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Initially, support for two JTAG TAP bus master interfaces with public hardware
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schematics will be included, but support of additional hardware is an expressed
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goal.
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1. JTAG hardware
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Currently, openocd contains support for Wiggler-compatible paralell port
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dongles and a USB interface based on the FTDI FT2232, called USBJTAG-1.
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A new version of the USB interface, USB-JTAG v1.2, is available with complete
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schematics (http://www.fh-augsburg.de/~hhoegl/proj/volksmikro/usb-jtag/050910/).
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It was tested using Amontec's (www.amontec.com) Chameleon POD in it's
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Wiggler configuration, but homemade wigglers should work just as well.
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In order to use the reset functionality (warm-reset, debug from reset, reset
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and init), the choosen Wiggler has to connect the nSRST line.
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USBJTAG-1 is based on a FTDI DLP2232M module and a few additional parts.
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Schematics are freely available. USB-JTAG v1.2 doesn't use the DLP2232M, but
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has the FTDI chip soldered directly on the PCB. There are two drivers for these
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modules implemented, one using the open source libftdi, the other using FTDI's
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proprietary FTD2XX library.
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2. Supported cores
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This version of openocd supports the following cores:
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- ARM7TDMI
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- ARM9TDMI
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Support for cores with MMUs (ARM720t, ARM920t) is currently being merged.
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3. Licensing
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openocd is licensed under the terms of the GNU General Public License, see the
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file COPYING for details.
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