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author | zwelch <zwelch@b42882b7-edfa-0310-969c-e2dbd0fdcd60> | 2009-06-18 00:29:39 +0000 |
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committer | zwelch <zwelch@b42882b7-edfa-0310-969c-e2dbd0fdcd60> | 2009-06-18 00:29:39 +0000 |
commit | 6f4d876c88122b7c1a97441f68eea37993b88c5f (patch) | |
tree | bd69bb14553687842ad3910d43f6972c31675cf2 /doc | |
parent | 8ab9b6d39eb2f17e7367b48855736ae73ad8360f (diff) | |
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David Brownell <david-b@pacbell.net>:
Various bits of cleanup, mostly to match the style hints
I just got around to writing up.
- Various @cindex improvements
- Cross reference the command line options in a few spots,
notably for @command{debug_level}
- Clean the config file guidelines a bit:
* They're for all users, not just integrators
* Reference the interface config chapter
* Don't emphasize command line usage here
* Tweak board and target config introductory text
Plus two minor bits of cleanup: remove most date references,
and refer to the reader as "you" not "the user".
git-svn-id: svn://svn.berlios.de/openocd/trunk@2271 b42882b7-edfa-0310-969c-e2dbd0fdcd60
Diffstat (limited to 'doc')
-rw-r--r-- | doc/openocd.texi | 178 |
1 files changed, 101 insertions, 77 deletions
diff --git a/doc/openocd.texi b/doc/openocd.texi index 3a396b1e..0a89d3f0 100644 --- a/doc/openocd.texi +++ b/doc/openocd.texi @@ -104,6 +104,8 @@ supported by a diverse community of software and hardware developers from around the world. @section What is OpenOCD? +@cindex TAP +@cindex JTAG The Open On-Chip Debugger (OpenOCD) aims to provide debugging, in-system programming and boundary-scan testing for embedded target @@ -356,7 +358,11 @@ give the directory where the Win32 FTDICHIP.COM 'CDM' driver zip file was unpack @option{--with-ftd2xx-linux-tardir=PATH} - If using FTDICHIP.COM ft2232c driver on Linux, give the directory where the Linux driver's TAR.GZ file was unpacked. @item -@option{--with-ftd2xx-lib=shared|static} - Linux only. Default: static. Specifies how the FTDICHIP.COM libftd2xx driver should be linked. Note: 'static' only works in conjunction with @option{--with-ftd2xx-linux-tardir}. The 'shared' value is supported (12/26/2008), however you must manually install the required header files and shared libraries in an appropriate place. This uses ``libusb'' internally. +@option{--with-ftd2xx-lib=shared|static} - Linux only. Default: static. +Specifies how the FTDICHIP.COM libftd2xx driver should be linked. +Note: 'static' only works in conjunction with @option{--with-ftd2xx-linux-tardir}. +The 'shared' value is supported, however you must manually install the required +header files and shared libraries in an appropriate place. @item @option{--enable-presto_libftdi} - Enable building support for ASIX Presto programmer using the libftdi driver. @item @@ -398,8 +404,9 @@ not available for all operating systems used with OpenOCD. 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 (12/26/2008) FTDICHIP does not supply means to install these -files ``in an appropriate place'' As a result, there are two +writing FTDICHIP does not supply means to install these +files ``in an appropriate place''. +As a result, there are two ``./configure'' options that help. Below is an example build process: @@ -476,7 +483,7 @@ openocd @option{-v} is executed. @cindex zy1000 @cindex printer port @cindex USB Adapter -@cindex rtck +@cindex RTCK Defined: @b{dongle}: A small device that plugins into a computer and serves as an adapter .... [snip] @@ -518,8 +525,6 @@ See: @url{http://www.ftdichip.com} for more information. In summer 2009, USB high speed (480 Mbps) versions of these FTDI chips are starting to become available in JTAG adapters. -As of 28/Nov/2008, the following are supported: - @itemize @bullet @item @b{usbjtag} @* Link @url{http://www.hs-augsburg.de/~hhoegl/proj/usbjtag/usbjtag.html} @@ -654,11 +659,9 @@ FlashLINK JTAG programing cable for PSD and uPSD} @node Running @chapter Running -@cindex running OpenOCD -@cindex --configfile -@cindex --debug_level -@cindex --logfile -@cindex --search +@cindex command line options +@cindex logfile +@cindex directory search The @option{--help} option shows: @verbatim @@ -696,8 +699,8 @@ itself), use the @option{-d} command line switch. This sets the @option{debug_level} to "3", outputting the most information, including debug messages. The default setting is "2", outputting only informational messages, warnings and errors. You can also change this -setting from within a telnet or gdb session using @option{debug_level -<n>} @xref{debug_level}. +setting from within a telnet or gdb session using @command{debug_level +<n>} (@pxref{debug_level}). You can redirect all output from the daemon to a file using the @option{-l <logfile>} switch. @@ -851,8 +854,9 @@ file, including basic configuration plus any TCL procedures to simplify your work. @section User Config Files -@cindex config file +@cindex config file, user @cindex user config file +@cindex config file, overview A user configuration file ties together all the parts of a project in one place. @@ -862,8 +866,10 @@ One of the following will match your situation best: @item Ideally almost everything comes from configuration files provided by someone else. For example, OpenOCD distributes a @file{scripts} directory -(probably in @file{/usr/share/openocd/scripts} on Linux); -board and tool vendors can provide these too. +(probably in @file{/usr/share/openocd/scripts} on Linux). +Board and tool vendors can provide these too, as can individual +user sites; the @option{-s} command line option lets you say +where to find these files. (@xref{Running}.) The AT91SAM7X256 example above works this way. Three main types of non-user configuration file each have their @@ -1003,15 +1009,12 @@ involving considerably more than just a three stage bootloader. @node Config File Guidelines @chapter Config File Guidelines -This section/chapter is aimed at developers and integrators of -OpenOCD. These are guidelines for creating new boards and new target -configurations as of 28/Nov/2008. +This chapter is aimed at any user who needs to write a config file, +including developers and integrators of OpenOCD and any user who +needs to get a new board working smoothly. +It provides guidelines for creating those files. -However, you, the user of OpenOCD, should be somewhat familiar with -this section as it should help explain some of the internals of what -you might be looking at. - -The user should find the following directories under @t{$(INSTALLDIR)/lib/openocd} : +You should find the following directories under @t{$(INSTALLDIR)/lib/openocd} : @itemize @bullet @item @b{interface} @@ -1033,43 +1036,43 @@ When a chip has multiple TAPs (maybe it has both ARM and DSP cores), the target config file defines all of them. @end itemize -@b{If needed...} The user in their ``openocd.cfg'' file or the board -file might override a specific feature in any of the above files by -setting a variable or two before sourcing the target file. Or adding -various commands specific to their situation. +The @file{openocd.cfg} user config +file may override features in any of the above files by +setting variables before sourcing the target file, or by adding +commands specific to their situation. @section Interface Config Files -@cindex config file -The user should be able to source one of these files via a command like this: +The user config file +should be able to source one of these files via a command like this: @example - source [find interface/FOOBAR.cfg] -Or: - openocd -f interface/FOOBAR.cfg +source [find interface/FOOBAR.cfg] @end example A preconfigured interface file should exist for every interface in use today, that said, perhaps some interfaces have only been used by the sole developer who created it. +A separate chapter gives information about how to set these up. +@xref{Interface - Dongle Configuration}. +Read the OpenOCD source code if you have a new kind of hardware interface +and need to provide a driver for it. + Interface files should be found in @t{$(INSTALLDIR)/lib/openocd/interface} @section Board Config Files -@cindex config file +@cindex config file, board +@cindex board config file -@b{Note: BOARD directory NEW as of 28/nov/2008} - -The user should be able to source one of these files via a command like this: +The user config file +should be able to source one of these files via a command like this: @example - source [find board/FOOBAR.cfg] -Or: - openocd -f board/FOOBAR.cfg +source [find board/FOOBAR.cfg] @end example - -The board file should contain one or more @t{source [find +The board config file should contain one or more @command{source [find target/FOO.cfg]} statements along with any board specific things. In summary the board files should contain (if present) @@ -1085,14 +1088,14 @@ In summary the board files should contain (if present) @end enumerate @section Target Config Files -@cindex config file +@cindex config file, target +@cindex target config file -The user should be able to source one of these files via a command like this: +Board config files should be able to source one or more +target config files via a command like this: @example - source [find target/FOOBAR.cfg] -Or: - openocd -f target/FOOBAR.cfg +source [find target/FOOBAR.cfg] @end example In summary the target files should contain @@ -1100,23 +1103,41 @@ In summary the target files should contain @enumerate @item Set defaults @item Add TAPs to the scan chain -@item Add CPU targets +@item Add CPU targets (includes GDB support) @item CPU/Chip/CPU-Core specific features @item On-Chip flash @end enumerate +As a rule of thumb, a target file sets up only one chip. +For a microcontroller, that will often include a single TAP, +which is a CPU needing a GDB target; and its on-chip flash. + +More complex chips may include multiple TAPs, and the target +config file may need to define them all before OpenOCD +can talk to the chip. +For example, some phone chips have JTAG scan chains that include +an ARM core for operating system use, a DSP, +another ARM core embedded in an image processing engine, +and other processing engines. + @subsection Important variable names -By default, the end user should never need to set these -variables. However, if the user needs to override a setting they only -need to set the variable in a simple way. +Most boards will have only one instance of a chip. +However, it should be easy to create a board with more than +one such chip. +Accordingly, we encourage some conventions for naming +variables associated with different TAPs, to promote +consistency and +so that board files can override target defaults, and @itemize @bullet @item @b{CHIPNAME} @* This gives a name to the overall chip, and is used as part of the tap identifier dotted name. +It's normally provided by the chip manufacturer. @item @b{ENDIAN} @* By default little - unless the chip or board is not normally used that way. +Chips that can't change endianness don't need to use this variable. @item @b{CPUTAPID} @* When OpenOCD examines the JTAG chain, it will attempt to identify every chip. If the @t{-expected-id} is nonzero, OpenOCD attempts @@ -1142,22 +1163,15 @@ specific to that board and that target. If the chip has 2 targets, use the names @b{_TARGETNAME0}, @b{_TARGETNAME1}, ... etc. -@b{Remember:} The ``board file'' may include multiple targets. - -At no time should the name ``target0'' (the default target name if -none was specified) be used. The name ``target0'' is a hard coded name -- the next target on the board will be some other number. -In the same way, avoid using target numbers even when they are -permitted; use the right target name(s) for your board. - -The user (or board file) should reasonably be able to: +@emph{Remember:} The ``board file'' may include multiple targets. +The user (or board) config file should reasonably be able to: @example - source [find target/FOO.cfg] - $_TARGETNAME configure ... FOO specific parameters +source [find target/FOO.cfg] +$_TARGETNAME configure ... FOO specific parameters - source [find target/BAR.cfg] - $_TARGETNAME configure ... BAR specific parameters +source [find target/BAR.cfg] +$_TARGETNAME configure ... BAR specific parameters @end example @end itemize @@ -1169,7 +1183,7 @@ Thus the rule we follow in OpenOCD is this: Variables that begin with a leading underscore are temporary in nature, and can be modified and used at will within a ?TARGET? configuration file. -@b{EXAMPLE:} The user should be able to do this: +@b{EXAMPLE:} The user config file should be able to do this: @example # Board has 3 chips, @@ -1359,7 +1373,7 @@ needed. We welcome JIM Tcl improvements, not bloat. @item @b{Scripts} @* OpenOCD configuration scripts are JIM Tcl Scripts. OpenOCD's -command interpreter today (28/nov/2008) is a mixture of (newer) +command interpreter today is a mixture of (newer) JIM-Tcl commands, and (older) the orginal command interpreter. @item @b{Commands} @@ -1566,6 +1580,9 @@ MMU: disabled, D-Cache: disabled, I-Cache: enabled @node Interface - Dongle Configuration @chapter Interface - Dongle Configuration +@cindex config file, interface +@cindex interface config file + JTAG Adapters/Interfaces/Dongles are normally configured through commands in an interface configuration file which is sourced by your @file{openocd.cfg} file, or @@ -2138,6 +2155,7 @@ which sets up CPUs and exports them as GDB targets, probes flash memory, performs low-level JTAG operations, and more. @section Scan Chains +@cindex scan chain TAPs are part of a hardware @dfn{scan chain}, which is daisy chain of TAPs. @@ -2232,6 +2250,7 @@ each TAP's instruction register can also change. @c (on entry to RESET state). @section TAP Names +@cindex dotted name When TAP objects are declared with @command{jtag newtap}, a @dfn{dotted.name} is created for the TAP, combining the @@ -2330,6 +2349,8 @@ ID code could appear (for example, multiple versions). @anchor{Enabling and Disabling TAPs} @section Enabling and Disabling TAPs @cindex TAP events +@cindex JTAG Route Controller +@cindex jrc In some systems, a @dfn{JTAG Route Controller} (JRC) is used to enable and/or disable specific JTAG TAPs. @@ -2422,6 +2443,8 @@ We'll start by looking at how to examine the targets you have, then look at how to add one more target and how to configure it. @section Target List +@cindex target, current +@cindex target, list All targets that have been set up are part of a list, where each member has a name. @@ -2498,6 +2521,9 @@ only relevant on boards which have more than one target. @end deffn @section Target CPU Types and Variants +@cindex target type +@cindex CPU type +@cindex CPU variant Each target has a @dfn{CPU type}, as shown in the output of the @command{targets} command. You need to specify that type @@ -2979,12 +3005,6 @@ used. (SPI flash must also be copied to memory before use.) However, the documentation also uses ``flash'' as a generic term; for example, ``Put flash configuration in board-specific files''. -@quotation Note -As of 28-nov-2008 OpenOCD does not know how to program a SPI -flash that a micro may boot from. Perhaps you, the reader, would like to -contribute support for this. -@end quotation - Flash Steps: @enumerate @item Configure via the command @command{flash bank} @@ -4012,8 +4032,12 @@ If @var{n} (from 0..3) is provided, then set it to that level. This affects the kind of messages sent to the server log. Level 0 is error messages only; level 1 adds warnings; -level 2 (the default) adds informational messages; +level 2 adds informational messages; and level 3 adds debugging messages. +The default is level 2, but that can be overridden on +the command line along with the location of that log +file (which is normally the server's standard output). +@xref{Running}. @end deffn @deffn Command fast (@option{enable}|@option{disable}) @@ -4057,7 +4081,7 @@ the initial log output channel is stderr. In this section ``target'' refers to a CPU configured as shown earlier (@pxref{CPU Configuration}). These commands, like many, implicitly refer to -a @dfn{current target} which is used to perform the +a current target which is used to perform the various operations. The current target may be changed by using @command{targets} command with the name of the target which should become current. @@ -5743,8 +5767,8 @@ is a string} parsed, but are NOT expanded or executed. @{Curly-Braces@} are like 'single-quote' operators in BASH shell scripts, with the added feature: @{curly-braces@} can be nested, single quotes can not. @{@{@{this is -nested 3 times@}@}@} NOTE: [date] is perhaps a bad example, as of -28/nov/2008, Jim/OpenOCD does not have a date command. +nested 3 times@}@}@} NOTE: [date] is a bad example; +at this writing, Jim/OpenOCD does not have a date command. @end itemize @section Consequences of Rule 1/2/3/4 @@ -5967,7 +5991,7 @@ $VARS and [square-brackets] are expanded later, when the EVENT occurs, and the text is evaluated. In case #4, they are replaced before the ``Target Object Command'' is executed. This occurs at the same time $_TARGETNAME is replaced. In case #4 the date will never -change. @{BTW: [date] is perhaps a bad example, as of 28/nov/2008, +change. @{BTW: [date] is a bad example; at this writing, Jim/OpenOCD does not have a date command@} @end enumerate @subsection Global Variables |