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>Packages</TITLE
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>eCos User Guide</TH
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>eCos User Guide</TH
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>Chapter 28. Manual Configuration</TD
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>Chapter 28. Manual Configuration</TD
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NAME="ECOS-PACKAGES">Packages</H1
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NAME="ECOS-PACKAGES">Packages</H1
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><P
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><P
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><SPAN
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><SPAN
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CLASS="PRODUCTNAME"
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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>eCos</SPAN
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> is a component architecture. The system comes as a
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> is a component architecture. The system comes as a
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number of packages which can be
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number of packages which can be
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enabled or disabled as required, and new packages can be
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enabled or disabled as required, and new packages can be
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added as they become available. Unfortunately, the packages
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added as they become available. Unfortunately, the packages
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are not completely independent: for example the µITRON
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are not completely independent: for example the µITRON
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compatibility package relies almost entirely on
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compatibility package relies almost entirely on
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functionality provided by the kernel package, and it would
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functionality provided by the kernel package, and it would
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not make sense to try to build µITRON if the kernel
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not make sense to try to build µITRON if the kernel
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was disabled. The C library has fewer dependencies: some
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was disabled. The C library has fewer dependencies: some
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parts of the C library rely on kernel functionality, but it
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parts of the C library rely on kernel functionality, but it
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is possible to disable these parts and thus build a system
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is possible to disable these parts and thus build a system
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that has the C library but no kernel. The
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that has the C library but no kernel. The
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<B
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<B
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CLASS="COMMAND"
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CLASS="COMMAND"
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>ecosconfig</B
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>ecosconfig</B
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> tool has the capability of
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> tool has the capability of
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checking that all the dependencies are satisfied, but it
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checking that all the dependencies are satisfied, but it
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may still be possible to produce configurations that will
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may still be possible to produce configurations that will
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not build or (conceivably) that will build but not run.
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not build or (conceivably) that will build but not run.
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Developers should be aware of this and take appropriate
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Developers should be aware of this and take appropriate
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care.</P
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care.</P
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><P
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><P
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>By default, <B
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>By default, <B
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CLASS="COMMAND"
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CLASS="COMMAND"
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>ecosconfig</B
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>ecosconfig</B
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> will
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> will
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include all packages that are appropriate for the specified hardware
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include all packages that are appropriate for the specified hardware
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in the configuration. The common HAL package and
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in the configuration. The common HAL package and
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the <SPAN
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the <SPAN
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CLASS="PRODUCTNAME"
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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>eCos</SPAN
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> infrastructure must be present in every configuration. In
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> infrastructure must be present in every configuration. In
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addition, it is always necessary to have one architectural HAL package
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addition, it is always necessary to have one architectural HAL package
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and one platform HAL package. Other packages are optional, and can
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and one platform HAL package. Other packages are optional, and can
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be added or removed from a configuration as required.</P
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be added or removed from a configuration as required.</P
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><P
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><P
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>The application may not require all of the packages; for example,
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>The application may not require all of the packages; for example,
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it might not need the µITRON compatibility
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it might not need the µITRON compatibility
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package, or the floating point support provided by the math library.
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package, or the floating point support provided by the math library.
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There is a slight overhead when <SPAN
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There is a slight overhead when <SPAN
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CLASS="PRODUCTNAME"
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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>eCos</SPAN
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> is built because the packages
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> is built because the packages
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will get compiled, and there is also a small disk space penalty.
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will get compiled, and there is also a small disk space penalty.
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However, any unused facilities will get stripped out at link-time,
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However, any unused facilities will get stripped out at link-time,
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so having redundant packages will not affect the final executable. </P
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so having redundant packages will not affect the final executable. </P
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>Building the System</TD
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>Building the System</TD
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>Coarse-grained Configuration</TD
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>Coarse-grained Configuration</TD
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