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2 Overview of a BSP

2.3 Components of a BSP

sysPhysMemTop( )

The sysPhysMemTop( ) routine in sysLib.c returns the address of the top of

physical memory. This routine is required for VxWorks 6.0 BSPs and, although it is

not strictly required for VxWorks 5.5 BSPs, it is included in most. This routine can

be enhanced to allow automatic memory sizing.

/***********************************************************************

* sysPhysMemTop - get the address of the top of physical memory

* This routine returns the address of the first missing byte of memory,

* which indicates the top of memory.

* Normally, the user specifies the amount of physical memory with the

* macro LOCAL_MEM_SIZE in config.h. BSPs that support run-time

* memory sizing do so only if the macro LOCAL_MEM_AUTOSIZE is defined.

* If not defined, then LOCAL_MEM_SIZE is assumed to be, and must be, the

* true size of physical memory.

* NOTE: Do not adjust LOCAL_MEM_SIZE to reserve memory for application

* use. See sysMemTop() for more information on reserving memory.

* RETURNS: The address of the top of physical memory.

* ERRNO

* SEE ALSO: sysMemTop()

char * sysPhysMemTop (void)

{

LOCAL char * physTop = NULL;

if (physTop == NULL)

{

physTop = (char *)(LOCAL_MEM_LOCAL_ADRS + LOCAL_MEM_SIZE);

}

return (physTop) ;

}

sysModel( )

The sysModel( ) routine in sysLib.c returns a string pointing to the model number

of the board. For simple BSPs, this routine returns a constant string. If the BSP

supports multiple board models, sysModel( ) requires a method to distinguish

between boards to determine which of the related strings to use. The following is

a simple example:

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 188 189

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RAM 6.0 BUX II Series Guía de usuario Pagina 43