BSP Developer's Guide

VxWorks 5.5
BSP Developer’s Guide
! CAUTION: Do not alter Wind River-supplied CDFs directly. Use the naming
convention to create a file whose higher precedence overrides the default
properties of Wind River-supplied components.
Step 11:
Generate the Project Files
The project configuration file (prjConfig.c) for each project is generated by the
project facility based on two things:
■
the set of components selected by the user from the component hierarchy
■
the information in the related component description files
To generate this file, click the Build button in the Build tab of the project facility.
NOTE: Generated project files (prjConfig.c) are free of the preprocessor #ifdefs
found in the traditional static configuration files, and, therefore, are easier to read.
6.3.4 Modifying a Component
Modify the properties of existing components by re-specifying them in any higher
priority CDF file. Third-party CDF files are by convention read last and therefore
have the highest priority. Use the naming convention to create a high-precedence
CDF file that overrides the default properties of Wind River components. See
6.3.2 CDF Precedence and Paths, p.126 for the file naming and precedence
conventions.
In the following example, the default number of open file descriptors
(NUM_FILES) in the standard Wind River component INCLUDE_IO_SYSTEM has
been modified. The normal default value is 50.
Parameter NUM_FILES {
DEFAULT 75
}
By adding these example lines of code to a third-party CDF file, by removing and
adding the component if it is already in the configuration, and by re-building the
project, the value of NUM_FILES is changed to 75. The original Wind River CDF
file, 00vxWorks.cdf, is not changed; the default property value is changed because
the third-party file has higher precedence. Other property values remain the same
unless specifically redefined.
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