RAM 6.0 BUX II Series Guia do Utilizador descarregar pdf (Página 88)

VxWorks

BSP Developer’s Guide, 6.0

The modern interface to the PCI autoconfiguration library, starting with VxWorks

5.5, uses an initialization routine, a routine to set configuration options, and a

routine to do the actual configuration. This differs from past versions, which

created a structure with configuration options and passed a pointer to that

structure when calling the routine that does the actual configuration. Many

reference BSPs are written with the older interface. However, to use the full

capability, the new interface must be used as described in this document.

With the new interface, sysPciConfig( ) may look something like this:

void sysPciConfig()

{

void *pCookie;

pCookie = pciAutoConfigLibInit(NULL);

pciAutoCfgCtl(pCookie, PCI_OPTION, optionValue);

...

pciAutoCfgCtl(pCookie, PCI_OPTION, optionValue);

pciAutoCfg(pCookie);

}

The calls to pciAutoCfgCtl( ) configure the addresses and options to use during

configuration. The available options are listed below.

If no calls to pciAutoCfgCtl( ) are made, the PCI autoconfiguration code

enumerates the busses and attempts to configure devices on the bus. However,

because there is no default memory or I/O space available, no devices are actually

configured. For this reason, the absolute minimum BSP requirement is that some

memory or I/O space be specified. For example, the following four lines allow

devices to be configured only in the non-cachable 32-bit memory space. If any of

the devices that are present cannot be configured for this space, they are not

configured.

pCookie = pciAutoConfigLibInit(NULL);

pciAutoCfgCtl(pCookie, PCI_MEMIO32_LOC_SET, PCI_MEMIO32_ADDR);

pciAutoCfgCtl(pCookie, PCI_MEMIO32_SIZE_SET, PCI_MEMIO32_SIZE);

pciAutoCfg(pCookie);

Typically, several other options are set as well. The available options, and the

arguments they use, are discussed in the following sections. A more

comprehensive example is presented in Example 3-1.

Fast Back-To-Back Transmissions

PCI_FBB_ENABLE

BOOL * pArg

PCI_FBB_DISABLE

void

PCI_FBB_UPDATE

BOOL * pArg

PCI_FBB_STATUS_GET

BOOL * pArg

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