RTEMS C User's Guide
Since memory is a critical resource in many real-time embedded systems, RTEMS was specifically designed to automatically leave out all services that are not required from the run-time environment. Features such as networking, various fileystems, and many other features are completely optional. This allows the application designer the flexibility to tailor RTEMS to most efficiently meet system requirements while still satisfying even the most stringent memory constraints. As a result, the size of the RTEMS executive is application dependent.
RTEMS requires RAM to manage each instance of an RTEMS object that is created. Thus the more RTEMS objects an application needs, the more memory that must be reserved. See Configuring a System Determining Memory Requirements for more details.
RTEMS utilizes memory for both code and data space. Although RTEMS' data space must be in RAM, its code space can be located in either ROM or RAM.
RTEMS C User's Guide
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