RTEMS 4.9.0 On-Line Library

Initialization Code Device Driver Initialization

BSP and Device Driver Development Guide

7.3.6: Device Driver Initialization

At this point in the initialization sequence, the initialization routines for all of the device drivers specified in the Device Driver Table are invoked. The initialization routines are invoked in the order they appear in the Device Driver Table.

The Driver Address Table is part of the RTEMS Configuration Table. It defines device drivers entry points (initialization, open, close, read, write, and control). For more information about this table, please refer to the Configuring a System chapter in the RTEMS Application C User's Guide.

The RTEMS initialization procedure calls the initialization function for every driver defined in the RTEMS Configuration Table (this allows one to include only the drivers needed by the application).

All these primitives have a major and a minor number as arguments:

the major number refers to the driver type,
the minor number is used to control two peripherals with the same driver (for instance, we define only one major number for the serial driver, but two minor numbers for channel A and B if there are two channels in the UART).

BSP and Device Driver Development Guide