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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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CLASS="SECT1"
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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&#8217;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
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>.</P
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><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
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Line No.	Rev	Author	Line
1	28	unneback	`<!-- Copyright (C) 2003 Red Hat, Inc. -->`
2			`<!-- This material may be distributed only subject to the terms -->`
3			`<!-- and conditions set forth in the Open Publication License, v1.0 -->`
4			`<!-- or later (the latest version is presently available at -->`
5			`<!-- http://www.opencontent.org/openpub/). -->`
6			`<!-- Distribution of the work or derivative of the work in any -->`
7			`<!-- standard (paper) book form is prohibited unless prior -->`
8			`<!-- permission is obtained from the copyright holder. -->`
9			`<HTML`
10			`><HEAD`
11			`><TITLE`
12			`>CDL Concepts</TITLE`
13			`><meta name="MSSmartTagsPreventParsing" content="TRUE">`
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15			`NAME="GENERATOR"`
16			`CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+`
17			`"><LINK`
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19			`TITLE="eCos User Guide"`
20			`HREF="ecos-user-guide.html"><LINK`
21			`REL="UP"`
22			`TITLE="eCos Programming Concepts and Techniques"`
23			`HREF="ecos-programming-concepts-and-techniques.html"><LINK`
24			`REL="PREVIOUS"`
25			`TITLE="eCos Programming Concepts and Techniques"`
26			`HREF="ecos-programming-concepts-and-techniques.html"><LINK`
27			`REL="NEXT"`
28			`TITLE="Component Repository"`
29			`HREF="cdl-component-repository.html"></HEAD`
30			`><BODY`
31			`CLASS="CHAPTER"`
32			`BGCOLOR="#FFFFFF"`
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44			`CELLSPACING="0"`
45			`><TR`
46			`><TH`
47			`COLSPAN="3"`
48			`ALIGN="center"`
49			`>eCos User Guide</TH`
50			`></TR`
51			`><TR`
52			`><TD`
53			`WIDTH="10%"`
54			`ALIGN="left"`
55			`VALIGN="bottom"`
56			`><A`
57			`HREF="ecos-programming-concepts-and-techniques.html"`
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59			`>Prev</A`
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62			`WIDTH="80%"`
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76			`></TABLE`
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78			`ALIGN="LEFT"`
79			`WIDTH="100%"></DIV`
80			`><DIV`
81			`CLASS="CHAPTER"`
82			`><H1`
83			`><A`
84			`NAME="CDL-CONCEPTS">Chapter 24. CDL Concepts</H1`
85			`><DIV`
86			`CLASS="TOC"`
87			`><DL`
88			`><DT`
89			`><B`
90			`>Table of Contents</B`
91			`></DT`
92			`><DT`
93			`><A`
94			`HREF="cdl-concepts.html#CDL-CONCEPTS-ABOUT"`
95			`>About this chapter</A`
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97			`><DT`
98			`><A`
99			`HREF="cdl-component-repository.html"`
100			`>Component Repository</A`
101			`></DT`
102			`><DT`
103			`><A`
104			`HREF="cdl-component-definition-language.html"`
105			`>Component Definition Language</A`
106			`></DT`
107			`><DT`
108			`><A`
109			`HREF="cdl-packages.html"`
110			`>Packages</A`
111			`></DT`
112			`><DT`
113			`><A`
114			`HREF="cdl-configuration-items.html"`
115			`>Configuration Items</A`
116			`></DT`
117			`><DT`
118			`><A`
119			`HREF="cdl-conflicts.html"`
120			`>Conflicts</A`
121			`></DT`
122			`><DT`
123			`><A`
124			`HREF="cdl-templates.html"`
125			`>Templates</A`
126			`></DT`
127			`></DL`
128			`></DIV`
129			`><DIV`
130			`CLASS="SECT1"`
131			`><H1`
132			`CLASS="SECT1"`
133			`><A`
134			`NAME="CDL-CONCEPTS-ABOUT">About this chapter</H1`
135			`><P`
136			`>This chapter serves as a brief introduction to the`
137			`concepts involved in <SPAN`
138			`CLASS="PRODUCTNAME"`
139			`>eCos</SPAN`
140			`> (Embedded Configurable Operating`
141			`System). It describes the configuration architecture and the`
142			`underlying technology to a level required for the embedded`
143			`systems developer to configure <SPAN`
144			`CLASS="PRODUCTNAME"`
145			`>eCos</SPAN`
146			`>. It does not describe in`
147			`detail aspects such as how to write reusable components for`
148			`<SPAN`
149			`CLASS="PRODUCTNAME"`
150			`>eCos</SPAN`
151			`>: this information is given in the <I`
152			`CLASS="CITETITLE"`
153			`>Component`
154			`Writer’s Guide</I`
155			`>.</P`
156			`><DIV`
157			`CLASS="SECT2"`
158			`><H2`
159			`CLASS="SECT2"`
160			`><A`
161			`NAME="AEN1835">Background</H2`
162			`><P`
163			`>Software solutions for the embedded space place`
164			`particularly stringent demands on the developer, typically`
165			`represented as requirements for small memory footprint, high`
166			`performance and robustness. These demands are addressed in`
167			`<SPAN`
168			`CLASS="PRODUCTNAME"`
169			`>eCos</SPAN`
170			`> by providing the ability to perform compile-time`
171			`specialization: the developer can tailor the operating`
172			`system to suit the needs of the application. In order to`
173			`make this process manageable, <SPAN`
174			`CLASS="PRODUCTNAME"`
175			`>eCos</SPAN`
176			`> is built in the context`
177			`of a Configuration Infrastructure: a set of tools including`
178			`a <SPAN`
179			`CLASS="APPLICATION"`
180			`>Configuration Tool</SPAN`
181			`> and a formal`
182			`description of the process of configuration by means of a`
183			`<SPAN`
184			`CLASS="emphasis"`
185			`><I`
186			`CLASS="EMPHASIS"`
187			`>Component Definition Language</I`
188			`></SPAN`
189			`>.</P`
190			`></DIV`
191			`><DIV`
192			`CLASS="SECT2"`
193			`><H2`
194			`CLASS="SECT2"`
195			`><A`
196			`NAME="AEN1842">Configurations</H2`
197			`><P`
198			`><SPAN`
199			`CLASS="PRODUCTNAME"`
200			`>eCos</SPAN`
201			`> is tailored at source level (that is, before`
202			`compilation or assembly) in order to create an <SPAN`
203			`CLASS="PRODUCTNAME"`
204			`>eCos</SPAN`
205			`>`
206			`<SPAN`
207			`CLASS="emphasis"`
208			`><I`
209			`CLASS="EMPHASIS"`
210			`>configuration</I`
211			`></SPAN`
212			`>. In concrete terms, an`
213			`<SPAN`
214			`CLASS="PRODUCTNAME"`
215			`>eCos</SPAN`
216			`> configuration takes the form of a configuration save`
217			`file (with extension .ecc) and set of files used to build`
218			`user applications (including, when built, a library file`
219			`against which the application is linked). </P`
220			`></DIV`
221			`></DIV`
222			`></DIV`
223			`><DIV`
224			`CLASS="NAVFOOTER"`
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241			`>Prev</A`
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249			`ACCESSKEY="H"`
250			`>Home</A`
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269			`>eCos</SPAN`
270			`> Programming Concepts and Techniques</TD`
271			`><TD`
272			`WIDTH="34%"`
273			`ALIGN="center"`
274			`VALIGN="top"`
275			`><A`
276			`HREF="ecos-programming-concepts-and-techniques.html"`
277			`ACCESSKEY="U"`
278			`>Up</A`
279			`></TD`
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290			`>`

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