RAM 6.0 BUX II Series Betriebsanweisung PDF herunterladen (Seite 97)

3 Porting a BSP to Custom Hardware

3.3 Finalizing Your BSP

PCI_INT_ASSIGN_FUNC_SET

This interrupt assignment routine is specified by assigning a function pointer with

the

PCI_INCLUDE_FUNC_SET pciAutoCfgCtl( ) command as follows:

pciAutoCfgCtl(pCookie, PCI_INT_ASSIGN_FUNC_SET, sysPciAutoconfigIntrAssign);

This optional routine takes as input both the bus-device-function tuple, and an

8-bit quantity that contains the contents of the interrupt pin register from the PCI

configuration header of the device. The interrupt pin register specifies which of the

four PCI interrupt request lines available are connected. The function prototype for

this routine is as follows:

UCHAR sysPciAutoconfigIntrAssign

(

PCI_SYSTEM *pSys,

PCI_LOC *pLoc,

UCHAR pin

);

This routine can use any combination of this data to ascertain the interrupt line

routing. The interrupt line value is returned from the routine, and is programmed

into the interrupt line register of the routine’s PCI configuration header. Device

drivers can subsequently read this register in order to associate the appropriate

interrupt vector to attach an interrupt service routine.

The default interrupt line value is 255.

PCI Configuration Example

The following is a more complete version of basic PCI configuration software for

an example BSP.

NOTE: For documentation clarity, many items in the following code example are

omitted and the order of routines are reorganized in a way that is contrary to Wind

River coding conventions. Actual PCI support code should follow Wind River or

other coding conventions for ease of maintenance.

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RAM 6.0 BUX II Series Betriebsanweisung Seite 97