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+<!-- Copyright (C) 2003 Red Hat, Inc. -->
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+<HTML
+><HEAD
+><TITLE
+>Packages</TITLE
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+NAME="GENERATOR"
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+HREF="ecos-user-guide.html"><LINK
+REL="UP"
+TITLE="Manual Configuration"
+HREF="manual-configuration.html"><LINK
+REL="PREVIOUS"
+TITLE="Building the System"
+HREF="building-the-system.html"><LINK
+REL="NEXT"
+TITLE="Coarse-grained Configuration"
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+><BODY
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+><TH
+COLSPAN="3"
+ALIGN="center"
+>eCos User Guide</TH
+></TR
+><TR
+><TD
+WIDTH="10%"
+ALIGN="left"
+VALIGN="bottom"
+><A
+HREF="building-the-system.html"
+ACCESSKEY="P"
+>Prev</A
+></TD
+><TD
+WIDTH="80%"
+ALIGN="center"
+VALIGN="bottom"
+>Chapter 28. Manual Configuration</TD
+><TD
+WIDTH="10%"
+ALIGN="right"
+VALIGN="bottom"
+><A
+HREF="coarse-grained-configuration.html"
+ACCESSKEY="N"
+>Next</A
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+><HR
+ALIGN="LEFT"
+WIDTH="100%"></DIV
+><DIV
+CLASS="SECT1"
+><H1
+CLASS="SECT1"
+><A
+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 µITRON
+ compatibility package relies almost entirely on
+ functionality provided by the kernel package, and it would
+ not make sense to try to build µITRON 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 µITRON 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
+></DIV
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+>Prev</A
+></TD
+><TD
+WIDTH="34%"
+ALIGN="center"
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+><A
+HREF="ecos-user-guide.html"
+ACCESSKEY="H"
+>Home</A
+></TD
+><TD
+WIDTH="33%"
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+>Next</A
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+><TR
+><TD
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+ALIGN="left"
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+>Building the System</TD
+><TD
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+HREF="manual-configuration.html"
+ACCESSKEY="U"
+>Up</A
+></TD
+><TD
+WIDTH="33%"
+ALIGN="right"
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+>Coarse-grained Configuration</TD
+></TR
+></TABLE
+></DIV
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+></HTML
+>
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