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Diffstat (limited to 'doc')
| -rw-r--r-- | doc/openocd.texi | 44 |
1 files changed, 43 insertions, 1 deletions
diff --git a/doc/openocd.texi b/doc/openocd.texi index a3ca1247..a765727c 100644 --- a/doc/openocd.texi +++ b/doc/openocd.texi @@ -2096,6 +2096,14 @@ target. List the debug adapter drivers that have been built into the running copy of OpenOCD. @end deffn +@deffn Command {interface transports} transport_name+ +Specifies the transports supported by this debug adapter. +The adapter driver builds-in similar knowledge; use this only +when external configuration (such as jumpering) changes what +the hardware can support. +@end deffn + + @deffn Command {adapter_name} Returns the name of the debug adapter driver being used. @@ -2428,7 +2436,41 @@ Turn power switch to target on/off. No arguments: print status. @end deffn -@end deffn +@section Transport Configuration +As noted earlier, depending on the version of OpenOCD you use, +and the debug adapter you are using, +several transports may be available to +communicate with debug targets (or perhaps to program flash memory). +@deffn Command {transport list} +displays the names of the transports supported by this +version of OpenOCD. +@end deffn + +@deffn Command {transport select} transport_name +Select which of the supported transports to use in this OpenOCD session. +The transport must be supported by the debug adapter hardware and by the +version of OPenOCD you are using (including the adapter's driver). +No arguments: print selected transport.. +@end deffn + +@subsection JTAG Transport +JTAG is the original transport supported by OpenOCD, and most +of the OpenOCD commands support it. +JTAG transports expose a chain of one or more Test Access Points (TAPs), +each of which must be explicitly declared. +JTAG supports both debugging and boundary scan testing. +Flash programming support is built on top of debug support. +@subsection SWD ransport +SWD (Serial Wire Debug) is an ARM-specific transport which exposes one +Debug Access Point (DAP, which must be explicitly declared. +(SWD uses fewer signal wires than JTAG.) +SWD is debug-oriented, and does not support boundary scan testing. +Flash programming support is built on top of debug support. +(Some processors support both JTAG and SWD.) +@subsection SPI ransport +The Serial Peripheral Interface (SPI) is a general purpose transport +which uses four wire signaling. Some processors use it as part of a +solution for flash programming. @anchor{JTAG Speed} @section JTAG Speed |