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oharboe 6996e628f8 David Brownell <> Mention how parallel clock voting implementations of RTCK work, 12 years ago
contrib Uwe Hermann <>: Make ICEbear look like other targets 12 years ago
doc David Brownell <> Mention how parallel clock voting implementations of RTCK work, 12 years ago
ecosflash deleted obsolete stuff. 13 years ago
src Simple warning fix 12 years ago
tcl David Brownell <> split EK board support out 12 years ago
testing Remove whitespace at end of lines, step 2. 12 years ago
tools Add script to automate most of the release process. 12 years ago
AUTHORS Add AUTHORS for 0.2.0 release. 12 years ago
AUTHORS.ChangeLog Add AUTHORS.ChangeLog file suitable to be passed to 'svn2cl --authors'. 12 years ago
BUGS Add comments to top-level files to "excuse" their Doxygen markup. 12 years ago
COPYING - prepare OpenOCD for branching, created ./trunk/ 15 years ago
ChangeLog retired 13 years ago Properly fix doxygen out-of-tree build process: 12 years ago Switch automake handling to use --gnu mode, not --foreign. 12 years ago
NEWS Add NEWS file for the 0.2.0 release. 12 years ago
NEWTAPS jtag newtap change & huge manual update 13 years ago
PATCHES Add comments to top-level files to "excuse" their Doxygen markup. 12 years ago
README Add section to provide some documentation for cross-compiling. 12 years ago
TODO wrote up workaround for xscale/debug_handler.bin bug 12 years ago
bootstrap Switch automake handling to use --gnu mode, not --foreign. 12 years ago - fix build when using a cross compiler - do not try and run any host tools 12 years ago - now works as expected when build_dir is not the same as src_dir 13 years ago
uncrustify.cfg Add uncrustify config file and helper script 13 years ago


Welcome to OpenOCD!

OpenOCD provides on-chip programming and debugging support with a
layered architecture of JTAG interface and TAP support, debug target
support (e.g. ARM, MIPS), and flash chip drivers (e.g. CFI, NAND, etc.).
Several network interfaces are available for interactiving with OpenOCD:
HTTP, telnet, TCL, and GDB. The GDB server enables OpenOCD to function
as a "remote target" for source-level debugging of embedded systems
using the GNU GDB program.

This README file contains an overview of the following topics:
- how to find and build more OpenOCD documentation,
- the build process
- packaging tips.
- configuration options

OpenOCD Documentation

In addition to in-tree documentation, the latest documentation may be
viewed on-line at the following URLs:

OpenOCD User's Guide:

OpenOCD Developer's Manual:

These reflect the latest development versions, so the following section
introduces how to build the complete documentation from the package.

For more information, refer to these documents or contact the developers
by subscribing to the OpenOCD developer mailing list:

Building the OpenOCD Documentation

The OpenOCD User's Guide can be produced in two different format:

# If PDFVIEWER is set, this creates and views the PDF User Guide.
make pdf && ${PDFVIEWER} doc/openocd.pdf

# If HTMLVIEWER is set, this creates and views the HTML User Guide.
make html && ${HTMLVIEWER} doc/openocd.html/index.html

The OpenOCD Developer Manual contains information about the internal
architecture and other details about the code:

# NB! make sure doxygen is installed, type doxygen --version
make doxygen

# If HTMLVIEWER is set, this views the HTML Doxygen output.
${HTMLVIEWER} doxygen/index.html

The remaining sections describe how to configure the system such that
you can build the in-tree documentation.

Installing OpenOCD

A Note to OpenOCD Users

If you would rather be working "with" OpenOCD rather than "on" it, your
operating system or interface supplier may provide binaries for you in a
convenient package.

Such packages should be more stable than SVN trunk, where bleeding-edge
development takes place. These "Packagers" produce binary releases of
OpenOCD after the developers produces new "stable" versions of the
source code. Previous versions of OpenOCD cannot be used to diagnosed
problems with the current release, so users are encouraged to keep in
contact with their distribution package maintainers or interface vendors
to ensure suitable upgrades appear regularly.

Users of these binary versions of OpenOCD must contact their Packager to
ask for support or newer versions of the binaries; the OpenOCD
developers do not support packages directly.

A Note to OpenOCD Packagers

You are a PACKAGER of OpenOCD if you:

- Sell dongles: and include pre-built binaries
- Supply tools: A complete development solution
- Supply IDEs: like Eclipse, or RHIDE, etc.
- Build packages: RPM files, or DEB files for a Linux Distro

As a PACKAGER, you will experience first reports of most issues.
When you fix those problems for your users, your solution may help
prevent hundreds (if not thousands) of other questions from other users.

If something does not work for you, please work to inform the OpenOCD
developers know how to improve the system or documentation to avoid
future problems, and follow-up to help us ensure the issue will be fully
resolved in our future releases.

That said, the OpenOCD developers would also like you to follow a few

- Send patches, including config files, upstream.
- Always build with printer ports enabled.
- Use libftdi + libusb for FT2232 support.

Remember, the FTD2XX library cannot be used in binary distributions, due
to restrictions of the GPL v2.

Building OpenOCD

The INSTALL file contains generic instructions for running 'configure'
and compiling the OpenOCD source code. That file is provided by default
for all GNU automake packages. If you are not familiar with the GNU
autotools, then you should read those instructions first.

The remainder of this document tries to provide some instructions for
those looking for a quick-install.

OpenOCD Dependencies

Presently, GCC is required to build OpenOCD. The developers have begun
to enforce strict code warnings (-Wall, -Werror, -Wextra, and more) and
use C99-specific features: inline functions, named initializers, mixing
declarations with code, and other tricks. While it may be possible to
use other compilers, they must be somewhat modern and could require
extending support to conditionally remove GCC-specific extensions.

Also, you need to install the appropriate driver files, if you want to
build support for a USB or FTDI-based interface:

- ft2232, jlink, rlink, vsllink, usbprog, arm-jtag-ew:
- libusb: required for portable communication with USB dongles
- ft2232 also requires:
- libftdi: *OR*
- ftd2xx:,
or the Amontec version (from, for
easier support of JTAGkey's vendor and product IDs.

Many Linux distributions provide these packages through their automated
installation and update mechanisms; however, some Linux versions include
older versions of libftdi. In particular, using Ubuntu 8.04 has been
problematic, but newer versions of Ubuntu do not have this problem.

Compiling OpenOCD

To build OpenOCD (on both Linux and Cygwin), use the following sequence
of commands:

./configure [with some options listed in the next section]
make install

The 'configure' step generates the Makefiles required to build OpenOCD,
usually with one or more options provided to it. The first 'make' step
will build OpenOCD and place the final executable in ./src/. The
final (optional) step, ``make install'', places all of the files in the
required location.

Cross-Compiling Options

To cross-compile, you must specify both --build and --host options to
the 'configure' script. For example, you can configure OpenOCD to
cross-compile on a x86 Linux host to run on Windows (MinGW32), you could
use the following configuration options:

./configure --build=i686-pc-linux-gnu --host=i586-mingw32msvc ...

Likewise, the following options allow OpenOCD to be cross-compiled for
an ARM target on the same x86 host:

./configure --build=i686-pc-linux-gnu --host=arm-elf ...

Both must be specified to work around bugs in autoconf.

Scripts for producing ARM cross-compilers can be found on the web with a
little searching. A script to produce an x86 Linux-hosted MinGW32
cross-compiler can be downloaded from the following URL:

Configuration Options

The configure script takes numerous options, specifying which JTAG
interfaces should be included (among other things). The following list
of options was extracted from the output of './configure --help'. Other
options may be available there:

--enable-maintainer-mode enable make rules and dependencies not useful
(and sometimes confusing) to the casual installer
NOTE: This option is *required* for SVN builds!
It should *not* be used to build a release.

--enable-dummy Enable building the dummy JTAG port driver

--enable-ft2232_libftdi Enable building support for FT2232 based devices
using the libftdi driver, opensource alternate of
--enable-ft2232_ftd2xx Enable building support for FT2232 based devices
using the FTD2XX driver from
Enable building support for FT2232H and
FT4232H-based devices (requires >=libftd2xx-0.4.16)

--enable-gw16012 Enable building support for the Gateworks GW16012
JTAG Programmer

--enable-parport Enable building the pc parallel port driver
--disable-parport-ppdev Disable use of ppdev (/dev/parportN) for parport
(for x86 only)
--enable-parport-giveio Enable use of giveio for parport (for CygWin only)

--enable-presto_libftdi Enable building support for ASIX Presto Programmer
using the libftdi driver
--enable-presto_ftd2xx Enable building support for ASIX Presto Programmer
using the FTD2XX driver

--enable-amtjtagaccel Enable building the Amontec JTAG-Accelerator driver
--enable-arm-jtag-ew Enable building support for the Olimex ARM-JTAG-EW
--enable-jlink Enable building support for the Segger J-Link JTAG
--enable-rlink Enable building support for the Raisonance RLink
JTAG Programmer
--enable-usbprog Enable building support for the usbprog JTAG
--enable-vsllink Enable building support for the Versaloon-Link JTAG

--enable-oocd_trace Enable building support for the OpenOCD+trace ETM
capture device

--enable-ep93xx Enable building support for EP93xx based SBCs
--enable-at91rm9200 Enable building support for AT91RM9200 based SBCs

--enable-ecosboard Enable building support for eCos based JTAG debugger
--enable-zy1000 Enable ZY1000 interface

Enable the dummy minidriver.

--enable-ioutil Enable ioutil functions - useful for standalone
OpenOCD implementations
--enable-httpd Enable builtin httpd server - useful for standalone
OpenOCD implementations

Miscellaneous Configure Options

The following additional options may also be useful:

--disable-assert turn off assertions

--enable-verbose Enable verbose JTAG I/O messages (for debugging).
Enable verbose JTAG I/O messages (for debugging).
--enable-verbose-usb-io Enable verbose USB I/O messages (for debugging)
Enable verbose USB communication messages (for
--enable-malloc-logging Include free space in logging messages (requires

--disable-gccwarnings Disable extra gcc warnings during build.
--disable-wextra Disable extra compiler warnings
--disable-werror Do not treat warnings as errors

Ignore unrecognized --enable and --with options.
--disable-dependency-tracking speeds up one-time build
--enable-shared[=PKGS] build shared libraries [default=no]
--enable-static[=PKGS] build static libraries [default=yes]

Parallel Port Dongles

If you want to access the parallel port using the PPDEV interface you
have to specify both --enable-parport AND --enable-parport-ppdev, since the
the later option is an option to the parport driver (see for more info).

The same is true for the --enable-parport-giveio option, you
have to use both the --enable-parport AND the --enable-parport-giveio
option if you want to use giveio instead of ioperm parallel port access

FT2232C Based USB Dongles

There are 2 methods of using the FTD2232, either (1) using the
FTDICHIP.COM closed source driver, or (2) the open (and free) driver


For both Linux and Windows, both libusb and libftdi must be built and
installed. To use the newer FT2232H chips, supporting RTCK and USB high
speed (480 Mbps), you need libftdi version 0.16 or newer. Many Linux
distributions provide suitable packages for these libraries.

For Windows, libftdi is supported with versions 0.14 and later.

With these prerequisites met, configure the libftdi solution like this:

./configure --prefix=/path/for/your/install --enable-ft2232_libftdi

Then type ``make'', and perhaps ``make install''.


Some claim the (closed) FTDICHIP.COM solution is faster, which
is the motivation for supporting it even though its licensing restricts
it to non-redistributable OpenOCD binaries, and it is not available for
all operating systems used with OpenOCD. You may, however, build such
copies for personal use.

The FTDICHIP drivers come as either a (win32) ZIP file, or a (Linux)
TAR.GZ file. You must unpack them ``some where'' convient. As of this
writing FTDICHIP does not supply means to install these files "in an
appropriate place."

If your distribution does not package these, there are several
'./configure' options to solve this problem:

Where (CYGWIN/MINGW) the zip file from
was unpacked <default=search>
Where (Linux/Unix) the tar file from
was unpacked <default=search>
--with-ftd2xx-lib Use static or shared ftd2xx libs on default static

If you are using the FTDICHIP.COM driver, download and unpack the
Windows or Linux FTD2xx drivers from the following location:

Remember, this library is binary-only, while OpenOCD is licenced
according to GNU GPLv2 without any exceptions. That means that
_distributing_ copies of OpenOCD built with the FTDI code would violate
the OpenOCD licensing terms.

Cygwin/Win32 Notes

The Cygwin/Win32 ZIP file contains a directory named ftd2xx.win32.
Assuming that you have extracted this archive in the same directory as
the OpenOCD package, you could configure with options like the following:

./configure \
--enable-ft2232_ftd2xx \
--with-ftd2xx-win32-zipdir=../ftd2xx.win32 \
... other options ...

Linux Notes

The Linux tar.gz archive contains a directory named libftd2xx0.4.16
(or similar). Assuming that you have extracted this archive in the same
directory as the OpenOCD package, you could configure with options like
the following:

./configure \
--enable-ft2232_ftd2xx \
--with-ft2xx-linux-tardir=../libftd2xx0.4.16 \
... other options ...

Obtaining OpenOCD From Subversion

You can download the current SVN version with an SVN client of your
choice from the following repositories:


Using the SVN command line client, you can use the following command to
fetch the latest version (make sure there is no (non-svn) directory
called "openocd" in the current directory):

svn checkout svn:// openocd

If you prefer GIT based tools, the git-svn package works too:

git svn clone -s svn://

Tips For Building From The Subversion Repository

Building OpenOCD from a repository requires a recent version of the GNU
autotools (autoconf >= 2.59 and automake >= 1.9). For building on
Windows, you have to use Cygwin. Make sure that your PATH
environment variable contains no other locations with Unix utils (like
UnxUtils) - these can't handle the Cygwin paths, resulting in obscure
dependency errors. This was an observation gathered from the logs of
one user; please correct us if this is wrong.

1) Run './bootstrap' to create the 'configure' script and prepare
the build process for your host system.

2) Run './configure --enable-maintainer-mode' with other options.