Update the CoreSight System Configuration document to cover the use of loadable modules to add configurations and features to the system.
Signed-off-by: Mike Leach mike.leach@linaro.org --- .../trace/coresight/coresight-config.rst | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
diff --git a/Documentation/trace/coresight/coresight-config.rst b/Documentation/trace/coresight/coresight-config.rst index a4e3ef295240..911db4da7f99 100644 --- a/Documentation/trace/coresight/coresight-config.rst +++ b/Documentation/trace/coresight/coresight-config.rst @@ -242,3 +242,22 @@ A preset to override the current parameter values can also be selected::
When configurations are selected in this way, then the trace sink used is automatically selected. + +Creating and Loading Custom Configurations +========================================== + +Custom configurations and / or features can be dynamically loaded into the +system by using a loadable module. + +An example of a custom configuration is found in ./samples/coresight. + +This creates a new configuration that uses the existing built in +strobing feature, but provides a different set of presets. + +When the module is loaded, then the configuration appears in the configfs +file system and is selectable in the same way as the built in configuration +described above. + +Configurations can use previously loaded features. The system will ensure +that it is not possible to unload a feature that is currently in use, by +enforcing the unload order as the strict reverse of the load order.