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->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
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-> tool has the capability of
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- 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
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->By default, <B
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-include all packages that are appropriate for the specified hardware
-in the configuration. The common HAL package and
-the <SPAN
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->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
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