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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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<HTML
><HEAD
><TITLE
>The eCos Component Writer's Guide</TITLE
><meta name="MSSmartTagsPreventParsing" content="TRUE">
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REL="NEXT"
TITLE="Overview"
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><BODY
CLASS="BOOK"
BGCOLOR="#FFFFFF"
TEXT="#000000"
LINK="#0000FF"
VLINK="#840084"
ALINK="#0000FF"
><DIV
CLASS="BOOK"
><A
NAME="CDL-GUIDE"><DIV
CLASS="TITLEPAGE"
><H1
CLASS="TITLE"
><A
NAME="AEN4">The <SPAN
CLASS="APPLICATION"
>eCos</SPAN
> Component Writer's Guide</H1
><H3
CLASS="AUTHOR"
><A
NAME="AEN8">Bart Veer</H3
><H3
CLASS="AUTHOR"
><A
NAME="AEN11">John Dallaway</H3
><P
CLASS="COPYRIGHT"
>Copyright &copy; 2000, 2001 by Red Hat Inc.</P
><HR></DIV
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
>1. <A
HREF="overview.html"
>Overview</A
></DT
><DD
><DL
><DT
><A
HREF="overview.html#OVERVIEW.TERMINOLOGY"
>Terminology</A
></DT
><DD
><DL
><DT
><A
HREF="overview.html#CONCEPTS.TERMINOLOGY.FRAMEWORK"
>Component Framework</A
></DT
><DT
><A
HREF="overview.html#CONCEPTS.TERMINOLOGY.OPTION"
>Configuration Option</A
></DT
><DT
><A
HREF="overview.html#CONCEPTS.TERMINOLOGY.COMPONENT"
>Component</A
></DT
><DT
><A
HREF="overview.html#CONCEPTS.TERMINOLOGY.PACKAGE"
>Package</A
></DT
><DT
><A
HREF="overview.html#CONCEPTS.TERMINOLOGY.CONFIGURATION"
>Configuration</A
></DT
><DT
><A
HREF="overview.html#CONCEPTS.TERMINOLOGY.TARGET"
>Target</A
></DT
><DT
><A
HREF="overview.html#CONCEPTS.TERMINOLOGY.TEMPLATE"
>Template</A
></DT
><DT
><A
HREF="overview.html#CONCEPTS.TERMINOLOGY.PROPERTIES"
>Properties</A
></DT
><DT
><A
HREF="overview.html#CONCEPTS.TERMINOLOGY.CONSEQUENCES"
>Consequences</A
></DT
><DT
><A
HREF="overview.html#CONCEPTS.TERMINOLOGY.CONSTRAINTS"
>Constraints</A
></DT
><DT
><A
HREF="overview.html#CONCEPTS.TERMINOLOGY.CONFLICTS"
>Conflicts</A
></DT
><DT
><A
HREF="overview.html#CONCEPTS.TERMINOLOGY.CDL"
>CDL</A
></DT
><DT
><A
HREF="overview.html#CONCEPTS.TERMINOLOGY.REPO"
>Component Repository</A
></DT
></DL
></DD
><DT
><A
HREF="overview.configurability.html"
>Why Configurability?</A
></DT
><DT
><A
HREF="overview.approaches.html"
>Approaches to Configurability</A
></DT
><DT
><A
HREF="overview.degress.html"
>Degrees of Configurability</A
></DT
><DT
><A
HREF="overview.warning.html"
>Warnings</A
></DT
></DL
></DD
><DT
>2. <A
HREF="package.html"
>Package Organization</A
></DT
><DD
><DL
><DT
><A
HREF="package.html#PACKAGE.HIERARCHY"
>Packages and the Component Repository</A
></DT
><DT
><A
HREF="package.versions.html"
>Package Versioning</A
></DT
><DT
><A
HREF="package.contents.html"
>Package Contents and Layout</A
></DT
><DD
><DL
><DT
><A
HREF="package.contents.html#PACKAGE.BUILD"
>Outline of the Build Process</A
></DT
><DT
><A
HREF="package.contents.html#PACKAGE.SOURCE"
>Configurable Source Code</A
></DT
><DT
><A
HREF="package.contents.html#PACKAGE.HEADERS"
>Exported Header Files</A
></DT
><DT
><A
HREF="package.contents.html#PACKAGE.DOCUMENTATION"
>Package Documentation</A
></DT
><DT
><A
HREF="package.contents.html#PACKAGE.TESTS"
>Test Cases</A
></DT
><DT
><A
HREF="package.contents.html#PACKAGE.HOST"
>Host-side Support</A
></DT
></DL
></DD
><DT
><A
HREF="package.distrib.html"
>Making a Package Distribution</A
></DT
><DD
><DL
><DT
><A
HREF="package.distrib.html#PACKAGE.DISTRIB.FORMAT"
>The <SPAN
CLASS="APPLICATION"
>eCos</SPAN
> package distribution file format</A
></DT
><DT
><A
HREF="package.distrib.html#PACKAGE.DISTRIB.PREPARE"
>Preparing eCos packages for distribution</A
></DT
></DL
></DD
></DL
></DD
><DT
>3. <A
HREF="language.html"
>The CDL Language</A
></DT
><DD
><DL
><DT
><A
HREF="language.html#LANGUAGE.OVERVIEW"
>Language Overview</A
></DT
><DT
><A
HREF="language.commands.html"
>CDL Commands</A
></DT
><DT
><A
HREF="language.properties.html"
>CDL Properties</A
></DT
><DD
><DL
><DT
><A
HREF="language.properties.html#LANGUAGE.PROPERTIES.USER"
>Information-providing Properties</A
></DT
><DT
><A
HREF="language.properties.html#LANGUAGE.PROPERTIES.HIERARCHY"
>The Configuration Hierarchy</A
></DT
><DT
><A
HREF="language.properties.html#LANGUAGE.PROPERTIES.VALUE"
>Value-related Properties</A
></DT
><DT
><A
HREF="language.properties.html#LANGUAGE.PROPERTIES.DEFINE"
>Generating the Configuration Header Files</A
></DT
><DT
><A
HREF="language.properties.html#LANGUAGE.PROPERTIES.BUILD"
>Controlling what gets Built</A
></DT
><DT
><A
HREF="language.properties.html#LANGUAGE.PROPERTIES.MISCELLANEOUS"
>Miscellaneous Properties</A
></DT
></DL
></DD
><DT
><A
HREF="language.naming.html"
>Option Naming Convention</A
></DT
><DT
><A
HREF="language.tcl.html"
>An Introduction to Tcl</A
></DT
><DT
><A
HREF="language.values.html"
>Values and Expressions</A
></DT
><DD
><DL
><DT
><A
HREF="language.values.html#LANGUAGE.VALUES.VALUE"
>Option Values</A
></DT
><DT
><A
HREF="language.values.html#LANGUAGE.EXPRESSION"
>Ordinary Expressions</A
></DT
><DT
><A
HREF="language.values.html#LANGUAGE.FUNCTIONS"
>Functions</A
></DT
><DT
><A
HREF="language.values.html#LANGUAGE.GOAL-EXPRESSION"
>Goal Expressions</A
></DT
><DT
><A
HREF="language.values.html#LANGUAGE.LIST-EXPRESSION"
>List Expressions</A
></DT
></DL
></DD
><DT
><A
HREF="language.interface.html"
>Interfaces</A
></DT
><DT
><A
HREF="language.database.html"
>Updating the <SPAN
CLASS="DATABASE"
>ecos.db</SPAN
> database</A
></DT
></DL
></DD
><DT
>4. <A
HREF="build.html"
>The Build Process</A
></DT
><DD
><DL
><DT
><A
HREF="build.html#BUILD.OUTLINE"
>Build Tree Generation</A
></DT
><DT
><A
HREF="build.headers.html"
>Configuration Header File Generation</A
></DT
><DD
><DL
><DT
><A
HREF="build.headers.html#BUILD.HEADERS.SYSTEM.H"
>The <TT
CLASS="FILENAME"
>system.h</TT
> Header</A
></DT
></DL
></DD
><DT
><A
HREF="build.make.html"
>Building eCos</A
></DT
><DD
><DL
><DT
><A
HREF="build.make.html#BUILD.MAKE.UPDATE"
>Updating the Build Tree</A
></DT
><DT
><A
HREF="build.make.html#BUILD.MAKE.EXPORT"
>Exporting Public Header Files</A
></DT
><DT
><A
HREF="build.make.html#BUILD.MAKE.COMPILES"
>Compiling</A
></DT
><DT
><A
HREF="build.make.html#BUILD.MAKE.LIBRARIES"
>Generating the Libraries</A
></DT
><DT
><A
HREF="build.make.html#BUILD.EXTRAS"
>The <TT
CLASS="FILENAME"
>extras.o</TT
> file</A
></DT
><DT
><A
HREF="build.make.html#BUILD.FLAGS"
>Compilers and Flags</A
></DT
><DT
><A
HREF="build.make.html#BUILD.CUSTOM"
>Custom Build Steps</A
></DT
><DT
><A
HREF="build.make.html#BUILD.STARTUP"
>Startup Code</A
></DT
><DT
><A
HREF="build.make.html#BUILD.LINKERSCRIPT"
>The Linker Script</A
></DT
></DL
></DD
><DT
><A
HREF="build.tests.html"
>Building Test Cases</A
></DT
></DL
></DD
><DT
>5. <A
HREF="reference.html"
>CDL Language Specification</A
></DT
><DD
><DL
><DT
><A
HREF="ref.cdl-option.html"
><TT
CLASS="LITERAL"
>cdl_option</TT
></A
>&nbsp;--&nbsp;Define a single configuration option</DT
><DT
><A
HREF="ref.cdl-component.html"
><TT
CLASS="LITERAL"
>cdl_component</TT
></A
>&nbsp;--&nbsp;Define a component, a collection of configuration options</DT
><DT
><A
HREF="ref.cdl-package.html"
><TT
CLASS="LITERAL"
>cdl_package</TT
></A
>&nbsp;--&nbsp;Define a package, a component that can be distributed</DT
><DT
><A
HREF="ref.cdl-interface.html"
><TT
CLASS="LITERAL"
>cdl_interface</TT
></A
>&nbsp;--&nbsp;Define an interface, functionality that can be provided by
a number of different implementations.</DT
><DT
><A
HREF="ref.active-if.html"
><SPAN
CLASS="PROPERTY"
>active_if</SPAN
></A
>&nbsp;--&nbsp;Allow additional control over the active state of an
option or other CDL entity.</DT
><DT
><A
HREF="ref.calculated.html"
><SPAN
CLASS="PROPERTY"
>calculated</SPAN
></A
>&nbsp;--&nbsp;Used if the current option's value is not user-modifiable,
but is calculated using a suitable CDL expression.</DT
><DT
><A
HREF="ref.compile.html"
><SPAN
CLASS="PROPERTY"
>compile</SPAN
></A
>&nbsp;--&nbsp;List the source files that should be built if this option
is active and enabled.</DT
><DT
><A
HREF="ref.default-value.html"
><SPAN
CLASS="PROPERTY"
>default_value</SPAN
></A
>&nbsp;--&nbsp;Provide a default value for this option using a CDL expression.</DT
><DT
><A
HREF="ref.define.html"
><SPAN
CLASS="PROPERTY"
>define</SPAN
></A
>&nbsp;--&nbsp;Specify additional <TT
CLASS="LITERAL"
>#define</TT
> symbols that
should go into the owning package's configuration header file.</DT
><DT
><A
HREF="ref.define-format.html"
><SPAN
CLASS="PROPERTY"
>define_format</SPAN
></A
>&nbsp;--&nbsp;Control how an option's value will appear in the
configuration header file.</DT
><DT
><A
HREF="ref.define-header.html"
><SPAN
CLASS="PROPERTY"
>define_header</SPAN
></A
>&nbsp;--&nbsp;Specify the  configuration header file that
will be generated for a given package.</DT
><DT
><A
HREF="ref.define-proc.html"
><SPAN
CLASS="PROPERTY"
>define_proc</SPAN
></A
>&nbsp;--&nbsp;Use a fragment of Tcl code to output additional data to
configuration header files.</DT
><DT
><A
HREF="ref.description.html"
><SPAN
CLASS="PROPERTY"
>description</SPAN
></A
>&nbsp;--&nbsp;Provide a textual description for an option.</DT
><DT
><A
HREF="ref.display.html"
><SPAN
CLASS="PROPERTY"
>display</SPAN
></A
>&nbsp;--&nbsp;Provide a short string describing this option.</DT
><DT
><A
HREF="ref.doc.html"
><SPAN
CLASS="PROPERTY"
>doc</SPAN
></A
>&nbsp;--&nbsp;The location of online-documentation for a configuration option.</DT
><DT
><A
HREF="ref.flavor.html"
><SPAN
CLASS="PROPERTY"
>flavor</SPAN
></A
>&nbsp;--&nbsp;Specify the nature of a configuration option.</DT
><DT
><A
HREF="ref.hardware.html"
><SPAN
CLASS="PROPERTY"
>hardware</SPAN
></A
>&nbsp;--&nbsp;Specify that a package is tied to specific hardware.</DT
><DT
><A
HREF="ref.if-define.html"
><SPAN
CLASS="PROPERTY"
>if_define</SPAN
></A
>&nbsp;--&nbsp;Output a common preprocessor construct to a configuration
header file.</DT
><DT
><A
HREF="ref.implements.html"
><SPAN
CLASS="PROPERTY"
>implements</SPAN
></A
>&nbsp;--&nbsp;Enabling this option provides one instance of a more
general interface.</DT
><DT
><A
HREF="ref.include-dir.html"
><SPAN
CLASS="PROPERTY"
>include_dir</SPAN
></A
>&nbsp;--&nbsp;Specify the desired location of a package's exported
header files in the install tree.</DT
><DT
><A
HREF="ref.include-files.html"
><SPAN
CLASS="PROPERTY"
>include_files</SPAN
></A
>&nbsp;--&nbsp;List the header files that are exported by a package.</DT
><DT
><A
HREF="ref.legal-values.html"
><SPAN
CLASS="PROPERTY"
>legal_values</SPAN
></A
>&nbsp;--&nbsp;Impose constraints on the possible values for an option.</DT
><DT
><A
HREF="ref.library.html"
><SPAN
CLASS="PROPERTY"
>library</SPAN
></A
>&nbsp;--&nbsp;Specify which library should contain the object files
generated by building this package.</DT
><DT
><A
HREF="ref.make.html"
><SPAN
CLASS="PROPERTY"
>make</SPAN
></A
>&nbsp;--&nbsp;Define an additional custom build step associated with an
option, resulting in a target that should not go directly into a library.</DT
><DT
><A
HREF="ref.make-object.html"
><SPAN
CLASS="PROPERTY"
>make_object</SPAN
></A
>&nbsp;--&nbsp;Define a custom build step, resulting in an object file
that should go into a library.</DT
><DT
><A
HREF="ref.no-define.html"
><SPAN
CLASS="PROPERTY"
>no_define</SPAN
></A
>&nbsp;--&nbsp;Suppress the normal generation of a preprocessor
<TT
CLASS="LITERAL"
>#define</TT
> symbol in a configuration header file.</DT
><DT
><A
HREF="ref.parent.html"
><SPAN
CLASS="PROPERTY"
>parent</SPAN
></A
>&nbsp;--&nbsp;Control the location of an option in the configuration hierarchy.</DT
><DT
><A
HREF="ref.requires.html"
><SPAN
CLASS="PROPERTY"
>requires</SPAN
></A
>&nbsp;--&nbsp;List constraints that the configuration should satisfy if
a given option is active and enabled..</DT
><DT
><A
HREF="ref.script.html"
><SPAN
CLASS="PROPERTY"
>script</SPAN
></A
>&nbsp;--&nbsp;Include additional configuration information from another
CDL script.</DT
></DL
></DD
><DT
>6. <A
HREF="advanced.html"
>Templates, Targets and Other Topics</A
></DT
><DD
><DL
><DT
><A
HREF="advanced.html#ADVANCED.TEMPLATES"
>Templates</A
></DT
><DT
><A
HREF="advanced.targets.html"
>Targets</A
></DT
></DL
></DD
></DL
></DIV
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