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NAME="CDL-CONCEPTS">Chapter 24. CDL Concepts</H1
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>Table of Contents</B
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NAME="CDL-CONCEPTS-ABOUT">About this chapter</H1
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>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
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>eCos</SPAN
>: this information is given in the <I
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>Component
	  Writer&#8217;s Guide</I
>.</P
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>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
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> 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
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> and a formal
	  description of the process of configuration by means of a
	  <SPAN
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>Component Definition Language</I
></SPAN
>.</P
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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
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