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#
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# $Id: README,v 1.2 2001-09-27 11:59:19 chris Exp $
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#
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Configuring a System Using the Template in confdefs.h
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=====================================================
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The file confdefs.h is a Configuration Template file which can be
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used to greatly simplify the creation and maintenance of RTEMS
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Configuration Tables. The basic concepts are:
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+ confdefs.h provides defaults for all configuration parameters
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+ applications specify only those values they wish to override
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+ confdefs.h can be the only file which knows the precise layout
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of the RTEMS Configuration Tables.
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The Configuration Template setup is used by all RTEMS tests to
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simplify the maintenance of the tests.
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Here is the section from the system.h file from test tm21 from
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the Timing Test Suite:
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/* configuration information */
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#define CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER
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#define CONFIGURE_APPLICATION_NEEDS_TIMER_DRIVER
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#define CONFIGURE_MAXIMUM_TASKS 102
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#define CONFIGURE_MAXIMUM_TIMERS 100
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#define CONFIGURE_MAXIMUM_SEMAPHORES 100
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#define CONFIGURE_MAXIMUM_MESSAGE_QUEUES 100
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#define CONFIGURE_MAXIMUM_PARTITIONS 100
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#define CONFIGURE_MAXIMUM_REGIONS 100
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#define CONFIGURE_MAXIMUM_PORTS 100
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#define CONFIGURE_MAXIMUM_PERIODS 100
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#define CONFIGURE_TICKS_PER_TIMESLICE 0
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#include
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The above example overrides a number of the configuration parameters.
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It informs the template that it is a member of the Timing Suite,
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requires a console and timer driver, and that it needs 102 tasks,
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100 timers, 100 semaphores, 100 message queues, 100 partitions,
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100 regions, 100 ports, and 100 periods. By default, the test
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would have gotten no drivers, 10 tasks, and no other RTEMS objects.
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The following shows the configuration tables generated by the
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template by default.
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#include
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#define NULL_DRIVER_TABLE_ENTRY \
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{ NULL, NULL, NULL, NULL, NULL, NULL }
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rtems_driver_address_table Device_drivers[] = {
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#ifdef CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER
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CONSOLE_DRIVER_TABLE_ENTRY,
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#endif
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#ifdef CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER
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CLOCK_DRIVER_TABLE_ENTRY,
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#endif
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#ifdef CONFIGURE_APPLICATION_NEEDS_STUB_DRIVER
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STUB_DRIVER_TABLE_ENTRY,
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#endif
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NULL_DRIVER_TABLE_ENTRY,
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};
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rtems_initialization_tasks_table Initialization_tasks[] = {
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{ rtems_build_name( 'U', 'I', '1', ' ' ), /* init task name */
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RTEMS_MINIMUM_STACK_SIZE, /* init task stack size */
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1, /* init task priority */
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RTEMS_DEFAULT_ATTRIBUTES, /* init task attributes */
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Init, /* init task entry point */
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RTEMS_NO_PREEMPT, /* init task initial mode */
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}
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};
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#ifdef CONFIGURE_MP_APPLICATION
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/*
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* NODE_NUMBER is assumed to be set on the compile line.
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*/
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rtems_multiprocessing_table Multiprocessing_configuration = {
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NODE_NUMBER, /* local node number */
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2, /* maximum # nodes in system */
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32, /* maximum # global objects */
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32, /* maximum # proxies */
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&MPCI_table /* pointer to MPCI config table */
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};
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#endif
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/*
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* CONFIGURE_EXECUTIVE_RAM_SIZE is a rough guess based on the number of
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* tasks in the system plus enough extra to get a whole 64K extra.
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*
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* The NULL address for the workspace area is assumed to be assigned
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* at startup time by the BSP.
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*/
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rtems_configuration_table Configuration = {
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NULL, /* executive RAM work area */
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CONFIGURE_EXECUTIVE_RAM_SIZE, /* executive RAM size */
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10, /* maximum # tasks */
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0, /* maximum # timers */
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0, /* maximum # semaphores */
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0, /* maximum # message queues */
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0, /* maximum # messages */
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0, /* maximum # partitions */
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0, /* maximum # regions */
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0, /* maximum # dp memory areas */
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0, /* maximum # periods */
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0, /* maximum # user extensions */
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RTEMS_MILLISECONDS_TO_MICROSECONDS(10), /* # us in a tick */
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50, /* # ticks in a timeslice */
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sizeof (Initialization_tasks) / sizeof(rtems_initialization_tasks_table),
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/* number of init tasks */
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Initialization_tasks, /* init task(s) table */
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sizeof (Device_drivers) / sizeof(rtems_driver_address_table),
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/* number of device drivers */
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Device_drivers, /* pointer to driver address table */
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NULL, /* pointer to initial extensions */
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#ifdef CONFIGURE_MP_APPLICATION
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&Multiprocessing_configuration
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#else
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NULL /* ptr to MP config table */
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#endif
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};
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