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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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NAME="ECOS-PACKAGES">Packages</H1
><P
><SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> is a component architecture. The system comes as a
          number of packages which can be
          enabled or disabled as required, and new packages can be
          added as they become available. Unfortunately, the packages
          are not completely independent: for example the &micro;ITRON
          compatibility package relies almost entirely on
          functionality provided by the kernel package, and it would
          not make sense to try to build &micro;ITRON if the kernel
          was disabled. The C library has fewer dependencies: some
          parts of the C library rely on kernel functionality, but it
          is possible to disable these parts and thus build a system
          that has the C library but no kernel. The
        <B
CLASS="COMMAND"
>ecosconfig</B
> tool has the capability of
            checking that all the dependencies are satisfied, but it
            may still be possible to produce configurations that will
            not build or (conceivably) that will build but not run.
            Developers should be aware of this and take appropriate
            care.</P
><P
>By default, <B
CLASS="COMMAND"
>ecosconfig</B
> will
include all packages that are appropriate for the specified hardware
in the configuration. The common HAL package and
the <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> infrastructure must be present in every configuration. In
addition, it is always necessary to have one architectural HAL package
and one platform HAL package. Other packages are optional, and can
be added or removed from a configuration as required.</P
><P
>The application may not require all of the packages; for example,
it might not need the &micro;ITRON compatibility
package, or the floating point support provided by the math library.
There is a slight overhead when <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> is built because the packages
will get compiled, and there is also a small disk space penalty.
However, any unused facilities will get stripped out at link-time,
so having redundant packages will not affect the final executable. </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/). -->`
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7			`<!-- standard (paper) book form is prohibited unless prior -->`
8			`<!-- permission is obtained from the copyright holder. -->`
9			`<HTML`
10			`><HEAD`
11			`><TITLE`
12			`>Packages</TITLE`
13			`><meta name="MSSmartTagsPreventParsing" content="TRUE">`
14			`<META`
15			`NAME="GENERATOR"`
16			`CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+`
17			`"><LINK`
18			`REL="HOME"`
19			`TITLE="eCos User Guide"`
20			`HREF="ecos-user-guide.html"><LINK`
21			`REL="UP"`
22			`TITLE="Manual Configuration"`
23			`HREF="manual-configuration.html"><LINK`
24			`REL="PREVIOUS"`
25			`TITLE="Building the System"`
26			`HREF="building-the-system.html"><LINK`
27			`REL="NEXT"`
28			`TITLE="Coarse-grained Configuration"`
29			`HREF="coarse-grained-configuration.html"></HEAD`
30			`><BODY`
31			`CLASS="SECT1"`
32			`BGCOLOR="#FFFFFF"`
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35			`VLINK="#840084"`
36			`ALINK="#0000FF"`
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42			`BORDER="0"`
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44			`CELLSPACING="0"`
45			`><TR`
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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="building-the-system.html"`
58			`ACCESSKEY="P"`
59			`>Prev</A`
60			`></TD`
61			`><TD`
62			`WIDTH="80%"`
63			`ALIGN="center"`
64			`VALIGN="bottom"`
65			`>Chapter 28. Manual Configuration</TD`
66			`><TD`
67			`WIDTH="10%"`
68			`ALIGN="right"`
69			`VALIGN="bottom"`
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76			`></TABLE`
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79			`WIDTH="100%"></DIV`
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81			`CLASS="SECT1"`
82			`><H1`
83			`CLASS="SECT1"`
84			`><A`
85			`NAME="ECOS-PACKAGES">Packages</H1`
86			`><P`
87			`><SPAN`
88			`CLASS="PRODUCTNAME"`
89			`>eCos</SPAN`
90			`> is a component architecture. The system comes as a`
91			`number of packages which can be`
92			`enabled or disabled as required, and new packages can be`
93			`added as they become available. Unfortunately, the packages`
94			`are not completely independent: for example the µITRON`
95			`compatibility package relies almost entirely on`
96			`functionality provided by the kernel package, and it would`
97			`not make sense to try to build µITRON if the kernel`
98			`was disabled. The C library has fewer dependencies: some`
99			`parts of the C library rely on kernel functionality, but it`
100			`is possible to disable these parts and thus build a system`
101			`that has the C library but no kernel. The`
102			`<B`
103			`CLASS="COMMAND"`
104			`>ecosconfig</B`
105			`> tool has the capability of`
106			`checking that all the dependencies are satisfied, but it`
107			`may still be possible to produce configurations that will`
108			`not build or (conceivably) that will build but not run.`
109			`Developers should be aware of this and take appropriate`
110			`care.</P`
111			`><P`
112			`>By default, <B`
113			`CLASS="COMMAND"`
114			`>ecosconfig</B`
115			`> will`
116			`include all packages that are appropriate for the specified hardware`
117			`in the configuration. The common HAL package and`
118			`the <SPAN`
119			`CLASS="PRODUCTNAME"`
120			`>eCos</SPAN`
121			`> infrastructure must be present in every configuration. In`
122			`addition, it is always necessary to have one architectural HAL package`
123			`and one platform HAL package. Other packages are optional, and can`
124			`be added or removed from a configuration as required.</P`
125			`><P`
126			`>The application may not require all of the packages; for example,`
127			`it might not need the µITRON compatibility`
128			`package, or the floating point support provided by the math library.`
129			`There is a slight overhead when <SPAN`
130			`CLASS="PRODUCTNAME"`
131			`>eCos</SPAN`
132			`> is built because the packages`
133			`will get compiled, and there is also a small disk space penalty.`
134			`However, any unused facilities will get stripped out at link-time,`
135			`so having redundant packages will not affect the final executable. </P`
136			`></DIV`
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138			`CLASS="NAVFOOTER"`
139			`><HR`
140			`ALIGN="LEFT"`
141			`WIDTH="100%"><TABLE`
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151			`VALIGN="top"`
152			`><A`
153			`HREF="building-the-system.html"`
154			`ACCESSKEY="P"`
155			`>Prev</A`
156			`></TD`
157			`><TD`
158			`WIDTH="34%"`
159			`ALIGN="center"`
160			`VALIGN="top"`
161			`><A`
162			`HREF="ecos-user-guide.html"`
163			`ACCESSKEY="H"`
164			`>Home</A`
165			`></TD`
166			`><TD`
167			`WIDTH="33%"`
168			`ALIGN="right"`
169			`VALIGN="top"`
170			`><A`
171			`HREF="coarse-grained-configuration.html"`
172			`ACCESSKEY="N"`
173			`>Next</A`
174			`></TD`
175			`></TR`
176			`><TR`
177			`><TD`
178			`WIDTH="33%"`
179			`ALIGN="left"`
180			`VALIGN="top"`
181			`>Building the System</TD`
182			`><TD`
183			`WIDTH="34%"`
184			`ALIGN="center"`
185			`VALIGN="top"`
186			`><A`
187			`HREF="manual-configuration.html"`
188			`ACCESSKEY="U"`
189			`>Up</A`
190			`></TD`
191			`><TD`
192			`WIDTH="33%"`
193			`ALIGN="right"`
194			`VALIGN="top"`
195			`>Coarse-grained Configuration</TD`
196			`></TR`
197			`></TABLE`
198			`></DIV`
199			`></BODY`
200			`></HTML`
201			`>`

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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [doc/] [html/] [user-guide/] [ecos-packages.html] - Blame information for rev 661