RTEMS C User's Guide
Each application utilizing the RTEMS I/O manager must specify the address of a Device Driver Table in its Configuration Table. This table contains each device driver's entry points. Each device driver may contain the following entry points:
If the device driver does not support a particular
entry point, then that entry in the Configuration Table should
be NULL. RTEMS will return
RTEMS_SUCCESSFUL as the executive's and
zero (0) as the device driver's return code for these device
driver entry points.
RTEMS C User's Guide
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