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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"><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+"><LINKREL="HOME"TITLE="eCos User Guide"HREF="ecos-user-guide.html"><LINKREL="UP"TITLE="eCos Programming Concepts and Techniques"HREF="ecos-programming-concepts-and-techniques.html"><LINKREL="PREVIOUS"TITLE="eCos Programming Concepts and Techniques"HREF="ecos-programming-concepts-and-techniques.html"><LINKREL="NEXT"TITLE="Component Repository"HREF="cdl-component-repository.html"></HEAD><BODYCLASS="CHAPTER"BGCOLOR="#FFFFFF"TEXT="#000000"LINK="#0000FF"VLINK="#840084"ALINK="#0000FF"><DIVCLASS="NAVHEADER"><TABLESUMMARY="Header navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">eCos User Guide</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="ecos-programming-concepts-and-techniques.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom"></TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="cdl-component-repository.html"ACCESSKEY="N">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="CHAPTER"><H1><ANAME="CDL-CONCEPTS">Chapter 24. CDL Concepts</H1><DIVCLASS="TOC"><DL><DT><B>Table of Contents</B></DT><DT><AHREF="cdl-concepts.html#CDL-CONCEPTS-ABOUT">About this chapter</A></DT><DT><AHREF="cdl-component-repository.html">Component Repository</A></DT><DT><AHREF="cdl-component-definition-language.html">Component Definition Language</A></DT><DT><AHREF="cdl-packages.html">Packages</A></DT><DT><AHREF="cdl-configuration-items.html">Configuration Items</A></DT><DT><AHREF="cdl-conflicts.html">Conflicts</A></DT><DT><AHREF="cdl-templates.html">Templates</A></DT></DL></DIV><DIVCLASS="SECT1"><H1CLASS="SECT1"><ANAME="CDL-CONCEPTS-ABOUT">About this chapter</H1><P>This chapter serves as a brief introduction to the concepts involved in <SPANCLASS="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 <SPANCLASS="PRODUCTNAME">eCos</SPAN>. It does not describe in detail aspects such as how to write reusable components for <SPANCLASS="PRODUCTNAME">eCos</SPAN>: this information is given in the <ICLASS="CITETITLE">Component Writer’s Guide</I>.</P><DIVCLASS="SECT2"><H2CLASS="SECT2"><ANAME="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 <SPANCLASS="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, <SPANCLASS="PRODUCTNAME">eCos</SPAN> is built in the context of a Configuration Infrastructure: a set of tools including a <SPANCLASS="APPLICATION">Configuration Tool</SPAN> and a formal description of the process of configuration by means of a <SPANCLASS="emphasis"><ICLASS="EMPHASIS">Component Definition Language</I></SPAN>.</P></DIV><DIVCLASS="SECT2"><H2CLASS="SECT2"><ANAME="AEN1842">Configurations</H2><P><SPANCLASS="PRODUCTNAME">eCos</SPAN> is tailored at source level (that is, before compilation or assembly) in order to create an <SPANCLASS="PRODUCTNAME">eCos</SPAN> <SPANCLASS="emphasis"><ICLASS="EMPHASIS">configuration</I></SPAN>. In concrete terms, an <SPANCLASS="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><DIVCLASS="NAVFOOTER"><HRALIGN="LEFT"WIDTH="100%"><TABLESUMMARY="Footer navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><AHREF="ecos-programming-concepts-and-techniques.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="ecos-user-guide.html"ACCESSKEY="H">Home</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><AHREF="cdl-component-repository.html"ACCESSKEY="N">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><SPANCLASS="PRODUCTNAME">eCos</SPAN> Programming Concepts and Techniques</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="ecos-programming-concepts-and-techniques.html"ACCESSKEY="U">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">Component Repository</TD></TR></TABLE></DIV></BODY></HTML>?? 快捷鍵說明
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