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<!-- Copyright (C) 2003 Red Hat, Inc. --> <!-- This material may be distributed only subject to the terms --> <!-- and conditions set forth in the Open Publication License, v1.0 --> <!-- or later (the latest version is presently available at --> <!-- http://www.opencontent.org/openpub/). --> <!-- Distribution of the work or derivative of the work in any --> <!-- standard (paper) book form is prohibited unless prior --> <!-- permission is obtained from the copyright holder. --> <HTML ><HEAD ><TITLE >CDL Concepts</TITLE ><meta name="MSSmartTagsPreventParsing" content="TRUE"> <META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ "><LINK REL="HOME" TITLE="eCos User Guide" HREF="ecos-user-guide.html"><LINK REL="UP" TITLE="eCos Programming Concepts and Techniques" HREF="ecos-programming-concepts-and-techniques.html"><LINK REL="PREVIOUS" TITLE="eCos Programming Concepts and Techniques" HREF="ecos-programming-concepts-and-techniques.html"><LINK REL="NEXT" TITLE="Component Repository" HREF="cdl-component-repository.html"></HEAD ><BODY CLASS="CHAPTER" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >eCos User Guide</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="ecos-programming-concepts-and-techniques.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="cdl-component-repository.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="CHAPTER" ><H1 ><A NAME="CDL-CONCEPTS">Chapter 24. CDL Concepts</H1 ><DIV CLASS="TOC" ><DL ><DT ><B >Table of Contents</B ></DT ><DT ><A HREF="cdl-concepts.html#CDL-CONCEPTS-ABOUT" >About this chapter</A ></DT ><DT ><A HREF="cdl-component-repository.html" >Component Repository</A ></DT ><DT ><A HREF="cdl-component-definition-language.html" >Component Definition Language</A ></DT ><DT ><A HREF="cdl-packages.html" >Packages</A ></DT ><DT ><A HREF="cdl-configuration-items.html" >Configuration Items</A ></DT ><DT ><A HREF="cdl-conflicts.html" >Conflicts</A ></DT ><DT ><A HREF="cdl-templates.html" >Templates</A ></DT ></DL ></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="CDL-CONCEPTS-ABOUT">About this chapter</H1 ><P >This chapter serves as a brief introduction to the concepts involved in <SPAN CLASS="PRODUCTNAME" >eCos</SPAN > (Embedded Configurable Operating System). It describes the configuration architecture and the underlying technology to a level required for the embedded systems developer to configure <SPAN CLASS="PRODUCTNAME" >eCos</SPAN >. It does not describe in detail aspects such as how to write reusable components for <SPAN CLASS="PRODUCTNAME" >eCos</SPAN >: this information is given in the <I CLASS="CITETITLE" >Component Writer’s Guide</I >.</P ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="AEN1835">Background</H2 ><P >Software solutions for the embedded space place particularly stringent demands on the developer, typically represented as requirements for small memory footprint, high performance and robustness. These demands are addressed in <SPAN CLASS="PRODUCTNAME" >eCos</SPAN > by providing the ability to perform compile-time specialization: the developer can tailor the operating system to suit the needs of the application. In order to make this process manageable, <SPAN CLASS="PRODUCTNAME" >eCos</SPAN > is built in the context of a Configuration Infrastructure: a set of tools including a <SPAN CLASS="APPLICATION" >Configuration Tool</SPAN > and a formal description of the process of configuration by means of a <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >Component Definition Language</I ></SPAN >.</P ></DIV ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="AEN1842">Configurations</H2 ><P ><SPAN CLASS="PRODUCTNAME" >eCos</SPAN > is tailored at source level (that is, before compilation or assembly) in order to create an <SPAN CLASS="PRODUCTNAME" >eCos</SPAN > <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >configuration</I ></SPAN >. In concrete terms, an <SPAN CLASS="PRODUCTNAME" >eCos</SPAN > configuration takes the form of a configuration save file (with extension .ecc) and set of files used to build user applications (including, when built, a library file against which the application is linked). </P ></DIV ></DIV ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="ecos-programming-concepts-and-techniques.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ecos-user-guide.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="cdl-component-repository.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><SPAN CLASS="PRODUCTNAME" >eCos</SPAN > Programming Concepts and Techniques</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ecos-programming-concepts-and-techniques.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Component Repository</TD ></TR ></TABLE ></DIV ></BODY ></HTML >