RAM 6.0 BUX II Series Guia do Utilizador descarregar pdf (Página 89)

3 Porting a BSP to Custom Hardware

3.3 Finalizing Your BSP

PCI_FBB_ENABLE and PCI_FBB_DISABLE enable and disable the routines that

check fast back-to-back (FBB) functionality.

PCI_FBB_UPDATE is for use with

dynamic or high availability (HA) applications.

PCI_FBB_UPDATE first disables

FBB on all routines, then enables FBB on all routines, if appropriate. In HA

applications, this option must be called any time a card is added or removed. The

BOOL pointed to by pArg for PCI_FBB_ENABLE and PCI_FBB_UPDATE is set to

TRUE if all cards allow FBB functionality; FALSE if any card does not allow FBB

functionality or if FBB is disabled. The

BOOL pointed to by pArg for

PCI_FBB_STATUS_GET is set to TRUE if PCI_FBB_ENABLE has been called and FBB

is enabled, even if FBB is not activated on any card. Otherwise, it is set to

FALSE.

In the current implementation, FBB is enabled or disabled on the entire bus. If any

device anywhere on the bus cannot support FBB, it is not enabled, even if specific

sub-busses can support it.

The FBB pciAutoCfgCtl( ) commands must be issued after the pciAutoCfg( ) call

is made and the bus is configured. Issuing these calls before pciAutoCfg( )

produces unpredictable results.

FBB bus cycles are disabled by default.

Latency Timer

PCI_MAX_LATENCY_FUNC_SET

This routine is called for each PCI device present on the bus when configuration

takes place. The routine accepts four arguments, specifying bus, device, routine,

and a user-supplied argument of type void*. For more information, see

PCI_MAX_LATENCY_ARG_SET below. The routine returns a UINT8 value that is

put into the

MAX_LAT field of the header structure. The user-supplied routine

returns a valid value each time it is called. There is no mechanism for any

ERROR

condition, but a default value can be returned in such a case.

NOTE: High availability (HA) is not available with all versions of VxWorks.

PCI_MAX_LATENCY_FUNC_SET

FUNCPTR * pArg

PCI_MAX_LATENCY_ARG_SET

void * pArg

PCI_MAX_LAT_ALL_SET

int pArg

PCI_MAX_LAT_ALL_GET

UINT * pArg

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