Generating a PCI host interrupt using the TMS320DM648 DVDP evalauation board.

Hi There:

I'm using the TMS320DM648 DVDP evaluation board and I'm trying to make that the DSP generates a PCI interrupt for the host. I'm using a sample program that comes with the pspdrivers however I can not generate the interrupt. I'm using the following code:

            status  =    PAL_sysPCIGetMemMapReg(pciHandle,
                                            PAL_SYSPCI_STATUS_SET,
                                            PAL_SYS_PCI_READ_WRITE_SIZE_WORD,
                                            &interruptStatus);
             if(PAL_SOK  !=  status)
             {
                 PCI_DEBUG("ERROR: Unable to write the memory mapped configuration register while interrupt genration\n");
                 return;
             }

            /*
             * Set DSPINT bit in memory mapped status set register
             */

            interruptStatus    =    interruptStatus | (0x01000000u);

            /*
             * Write the status set register to trigger interrupt
             */
            status  =    PAL_sysPCISetMemMapReg(pciHandle,
                                        PAL_SYSPCI_STATUS_SET,
                                        PAL_SYS_PCI_READ_WRITE_SIZE_WORD,
                                        interruptStatus);
             if(PAL_SOK  !=  status)
             {
                 PCI_DEBUG("ERROR: Unable to write the Backend configuration register while interrupt genration\n");
                 return;
             }

After runing this piece of code, the value of the PAL_SYSPCI_STATUS_SET register is still the same as it was read before.

1.- What am I missing?

2.- Also, the original example ORs the interruptStatus variable with (0x80000000u) instead. Why? According to the SPRUEL4 (PCI User's Guide) the interrupt are located on bits 24-27, and bit 31 is reserved.

Thanks;

Gabriel