Welcome to OpenOCD!
===================

OpenOCD provides on-chip programming and debugging support with a
layered architecture of JTAG interface and TAP support including:

- (X)SVF playback to facilitate automated boundary scan and FPGA/CPLD
  programming;
- debug target support (e.g. ARM, MIPS): single-stepping,
  breakpoints/watchpoints, gprof profiling, etc;
- flash chip drivers (e.g. CFI, NAND, internal flash);
- embedded TCL interpreter for easy scripting.

Several network interfaces are available for interacting with OpenOCD:
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 (and the others who talk GDB protocol, e.g. IDA
Pro).

This README file contains an overview of the following topics:

- quickstart instructions,
- how to find and build more OpenOCD documentation,
- list of the supported hardware,
- the installation and build process,
- packaging tips.


============================
Quickstart for the impatient
============================

If you have a popular board then just start OpenOCD with its config,
e.g.:

  openocd -f board/stm32f4discovery.cfg

If you are connecting a particular adapter with some specific target,
you need to source both the jtag interface and the target configs,
e.g.:

  openocd -f interface/ftdi/jtagkey2.cfg -c "transport select jtag" \
          -f target/ti_calypso.cfg

  openocd -f interface/stlink.cfg -c "transport select hla_swd" \
          -f target/stm32l0.cfg

After OpenOCD startup, connect GDB with

  (gdb) target extended-remote localhost:3333


=====================
OpenOCD Documentation
=====================

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

  OpenOCD User's Guide:
    http://openocd.org/doc/html/index.html

  OpenOCD Developer's Manual:
    http://openocd.org/doc/doxygen/html/index.html

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:

	openocd-devel@lists.sourceforge.net

Building the OpenOCD Documentation
----------------------------------

By default the OpenOCD build process prepares documentation in the
"Info format" and installs it the standard way, so that "info openocd"
can access it.

Additionally, the OpenOCD User's Guide can be produced in the
following different formats:

  # 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 && ${HTMLVIEWER} doxygen/index.html


==================
Supported hardware
==================

JTAG adapters
-------------

AICE, ARM-JTAG-EW, ARM-USB-OCD, ARM-USB-TINY, AT91RM9200, axm0432, BCM2835,
Bus Blaster, Buspirate, Cadence DPI, Chameleon, CMSIS-DAP, Cortino,
Cypress KitProg, DENX, Digilent JTAG-SMT2, DLC 5, DLP-USB1232H,
embedded projects, eStick, FlashLINK, FlossJTAG, Flyswatter, Flyswatter2,
FTDI FT232R, Gateworks, Hoegl, ICDI, ICEBear, J-Link, JTAG VPI, JTAGkey,
JTAGkey2, JTAG-lock-pick, KT-Link, Linux GPIOD, Lisa/L, LPC1768-Stick,
Mellanox rshim, MiniModule, NGX, Nuvoton Nu-Link, Nu-Link2, NXHX, NXP IMX GPIO,
OOCDLink, Opendous, OpenJTAG, Openmoko, OpenRD, OSBDM, Presto, Redbee,
Remote Bitbang, RLink, SheevaPlug devkit, Stellaris evkits,
ST-LINK (SWO tracing supported), STM32-PerformanceStick, STR9-comStick,
sysfsgpio, TI XDS110, TUMPA, Turtelizer, ULINK, USB-A9260, USB-Blaster,
USB-JTAG, USBprog, VPACLink, VSLLink, Wiggler, XDS100v2, Xilinx XVC/PCIe,
Xverve.

Debug targets
-------------

ARM: AArch64, ARM11, ARM7, ARM9, Cortex-A/R (v7-A/R), Cortex-M (ARMv{6/7/8}-M),
FA526, Feroceon/Dragonite, XScale.
ARCv2, AVR32, DSP563xx, DSP5680xx, EnSilica eSi-RISC, EJTAG (MIPS32, MIPS64),
Intel Quark, LS102x-SAP, NDS32, RISC-V, ST STM8.

Flash drivers
-------------

ADUC702x, AT91SAM, AT91SAM9 (NAND), ATH79, ATmega128RFA1, Atmel SAM, AVR, CFI,
DSP5680xx, EFM32, EM357, eSi-RISC, eSi-TSMC, EZR32HG, FM3, FM4, Freedom E SPI,
i.MX31, Kinetis, LPC8xx/LPC1xxx/LPC2xxx/LPC541xx, LPC2900, LPC3180, LPC32xx,
LPCSPIFI, Marvell QSPI, MAX32, Milandr, MXC, NIIET, nRF51, nRF52 , NuMicro,
NUC910, Orion/Kirkwood, PIC32mx, PSoC4/5LP/6, Renesas RPC HF and SH QSPI,
S3C24xx, S3C6400, SiM3x, SiFive Freedom E, Stellaris, ST BlueNRG, STM32,
STM32 QUAD/OCTO-SPI for Flash/FRAM/EEPROM, STMSMI, STR7x, STR9x, SWM050,
TI CC13xx, TI CC26xx, TI CC32xx, TI MSP432, Winner Micro w600, Xilinx XCF,
XMC1xxx, XMC4xxx.


==================
Installing OpenOCD
==================

A Note to OpenOCD Users
-----------------------

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

Such packages may be more stable than git mainline, where
bleeding-edge development takes place. These "Packagers" produce
binary releases of OpenOCD after the developers produces new "release"
versions of the source code. Previous versions of OpenOCD cannot be
used to diagnose 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 or IDEs (a development solution integrating OpenOCD);
- Build packages (e.g. RPM or DEB files for a GNU/Linux distribution).

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
suggestions:

- Send patches, including config files, upstream, participate in the
  discussions;
- Enable all the options OpenOCD supports, even those unrelated to your
  particular hardware;
- Use "ftdi" interface adapter driver for the FTDI-based devices.


================
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 autotools 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
--------------------

GCC or Clang is currently 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.

You'll also need:

- make
- libtool
- pkg-config >= 0.23 (or compatible)

Additionally, for building from git:

- autoconf >= 2.64
- automake >= 1.14
- texinfo >= 5.0

USB-based adapters depend on libusb-1.0 and some older drivers require
libusb-0.1 or libusb-compat-0.1. A compatible implementation, such as
FreeBSD's, additionally needs the corresponding .pc files.

USB-Blaster, ASIX Presto and OpenJTAG interface adapter
drivers need:
  - libftdi: http://www.intra2net.com/en/developer/libftdi/index.php

CMSIS-DAP support needs HIDAPI library.

Permissions delegation
----------------------

Running OpenOCD with root/administrative permissions is strongly
discouraged for security reasons.

For USB devices on GNU/Linux you should use the contrib/60-openocd.rules
file. It probably belongs somewhere in /etc/udev/rules.d, but
consult your operating system documentation to be sure. Do not forget
to add yourself to the "plugdev" group.

For parallel port adapters on GNU/Linux and FreeBSD please change your
"ppdev" (parport* or ppi*) device node permissions accordingly.

For parport adapters on Windows you need to run install_giveio.bat
(it's also possible to use "ioperm" with Cygwin instead) to give
ordinary users permissions for accessing the "LPT" registers directly.

Compiling OpenOCD
-----------------

To build OpenOCD, use the following sequence of commands:

  ./bootstrap (when building from the git repository)
  ./configure [options]
  make
  sudo 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.

To see the list of all the supported options, run
  ./configure --help

Cross-compiling Options
-----------------------

Cross-compiling is supported the standard autotools way, you just need
to specify the cross-compiling target triplet in the --host option,
e.g. for cross-building for Windows 32-bit with MinGW on Debian:

  ./configure --host=i686-w64-mingw32 [options]

To make pkg-config work nicely for cross-compiling, you might need an
additional wrapper script as described at

  https://autotools.io/pkgconfig/cross-compiling.html

This is needed to tell pkg-config where to look for the target
libraries that OpenOCD depends on. Alternatively, you can specify
*_CFLAGS and *_LIBS environment variables directly, see "./configure
--help" for the details.

For a more or less complete script that does all this for you, see

  contrib/cross-build.sh

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 later option is an option to the parport driver.

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
method.


==========================
Obtaining OpenOCD From GIT
==========================

You can download the current GIT version with a GIT client of your
choice from the main repository:

   git://git.code.sf.net/p/openocd/code

You may prefer to use a mirror:

   http://repo.or.cz/r/openocd.git
   git://repo.or.cz/openocd.git

Using the GIT command line client, you might use the following command
to set up a local copy of the current repository (make sure there is no
directory called "openocd" in the current directory):

   git clone git://git.code.sf.net/p/openocd/code openocd

Then you can update that at your convenience using

   git pull

There is also a gitweb interface, which you can use either to browse
the repository or to download arbitrary snapshots using HTTP:

   http://repo.or.cz/w/openocd.git

Snapshots are compressed tarballs of the source tree, about 1.3 MBytes
each at this writing.

Building OpenOCD for Windows
----------------------------

You can build OpenOCD for Windows natively with either MinGW-w64/MSYS
or Cygwin (plain MinGW might work with --disable-werror but is not
recommended as it doesn't provide enough C99 compatibility).
Alternatively, one can cross-compile it using MinGW-w64 on a *nix
host. See README for the generic instructions.

Also, the MSYS2 project provides both ready-made binaries and an easy
way to self-compile from their software repository out of the box.

Native MinGW-w64/MSYS compilation
-----------------------------

As MSYS doesn't come with pkg-config pre-installed, you need to add it
manually. The easiest way to do that is to download pkg-config-lite
from:

  http://sourceforge.net/projects/pkgconfiglite/

Then simply unzip the archive to the root directory of your MinGW-w64
installation.

USB adapters
------------

For the adapters that use a HID-based protocol, e.g. CMSIS-DAP, you do
not need to perform any additional configuration.

For all the others you usually need to have WinUSB.sys (or
libusbK.sys) driver installed. Some vendor software (e.g. for
ST-LINKv2) does it on its own. For the other cases the easiest way to
assign WinUSB to a device is to use the latest Zadig installer:

  http://zadig.akeo.ie

When using a composite USB device, it's often necessary to assign
WinUSB.sys to the composite parent instead of the specific
interface. To do that one needs to activate an advanced option in the
Zadig installer.

For the old drivers that use libusb-0.1 API you might need to link
against libusb-win32 headers and install the corresponding driver with
Zadig.

If you need to use the same adapter with other applications that may
require another driver, a solution for Windows Vista and above is to
activate the IgnoreHWSerNum registry setting for the USB device.

That setting forces Windows to associate the driver per port instead of
per serial number, the same behaviour as when the device does not contain
a serial number. So different drivers can be installed for the adapter on
different ports and you just need to plug the adapter into the correct
port depending on which application to use.

For more information, see:

  http://msdn.microsoft.com/en-us/library/windows/hardware/jj649944(v=vs.85).aspx
  http://www.ftdichip.com/Support/Knowledgebase/index.html?ignorehardwareserialnumber.htm

Building OpenOCD for macOS
--------------------------

There are a few prerequisites you will need first:

- Xcode (install from the AppStore)
- Command Line Tools (install from Xcode -> Preferences -> Downloads)
- Gentoo Prefix (http://www.gentoo.org/proj/en/gentoo-alt/prefix/bootstrap.xml)
  or
- Homebrew (http://mxcl.github.io/homebrew/)
  or
- MacPorts (http://www.macports.org/install.php)


If you're building manually you need Texinfo version 5.0 or later. The
simplest way to get it is to use Homebrew (brew install texinfo) and
then ``export PATH=/usr/local/opt/texinfo/bin:$PATH``.


With Gentoo Prefix you can build the release version or the latest
devel version (-9999) the usual way described in the Gentoo
documentation. Alternatively, install the prerequisites and build
manually from the sources.


With Homebrew you can either run:
  brew install [--HEAD] openocd (where optional --HEAD asks brew to
                                 install the current git version)
    or
  brew install libtool automake libusb [libusb-compat] [hidapi] [libftdi]
    (to install the needed dependencies and then proceed with the
     manual building procedure)


For building with MacPorts you need to run:
  sudo port install libtool automake autoconf pkgconfig \
    libusb [libusb-compat] [libftdi1]

You should also specify LDFLAGS and CPPFLAGS to allow configure to use
MacPorts' libraries, so run configure like this:
  LDFLAGS=-L/opt/local/lib CPPFLAGS=-I/opt/local/include ./configure [options]


See README for the generic building instructions.

If you're using a USB adapter and have a driver kext matched to it,
you will need to unload it prior to running OpenOCD. E.g. with Apple
driver (OS X 10.9 or later) for FTDI run:
  sudo kextunload -b com.apple.driver.AppleUSBFTDI
for FTDI vendor driver use:
  sudo kextunload FTDIUSBSerialDriver.kext

To learn more on the topic please refer to the official libusb FAQ:
https://github.com/libusb/libusb/wiki/FAQ