ISR can't be fired on EVM6472 with CCS4.0

I tried to transplant an example described in sprab20 from EVM 6474 to EVM 6472 and I also made some modifications.C code as follow:

#include <std.h>

#include <log.h>

#include <c6x.h>

#include "ipccfg.h"

#include "c64.h"

#include "cslr_intgen.h"

#include <stdio.h>

CSL_IntgenRegs *ipcRegsPtr = (CSL_IntgenRegs*)(0x02880800);

void sendIPCmessage(unsigned long msg);

main()

{

LOG_printf(&trace, "starting main on core %d\n",DNUM);

C64_enableIER(1<<4);

}

unsigned long received_message;

unsigned long message = 268435454;

void IPCisr(void)

{

SEM_post(&SEM0);

received_message = (ipcRegsPtr->IPCGR1 >> 4) & 0xFFFFFFF; 

ipcRegsPtr->IPCAR1 = 0xFFFFFFFF;

}

void sendIPCmessagePRD(){

      switch(DNUM){

                  case 0:

                      LOG_printf(&trace, "sending IPC on core %d",DNUM);

                     sendIPCmessage(message);

                     break;

               case 1:

                     LOG_printf(&trace, "receiving IPC from core %d",0);

                     break;

};

message++;

}

void sendIPCmessage(unsigned long msg)

{

ipcRegsPtr->IPCGR1 = (msg & 0xFFFFFFF) << 4;

ipcRegsPtr->IPCGR1 |=1;

}

void receiveIPCTask0()

{

while(1){

        SEM_pend(&SEM0,SYS_FOREVER);

        LOG_printf(&trace,"got message %d from core 0", received_message);

        };

}

And I use the DSP/BIOS,the configuration as follow:

HWI_INT4 is the object that corresponds to the inter-core interrupt,  with the interrupt selection number 84.the corresponding software function is  IPCisr,;

PRDipcsend is a periodic function that is responsible for sending messages.The corresponding software function is sendIPCmessagePRD;

TSK0 is processing messages from cores 0. The corresponding software function is receiveIPCTask0 which  run forever and pend on SEM0.

But when I run this same program in core0 and core1 simultaneously on EVM6472  via CCS4.0 ，it seems that the program on core1 can't get into the function IPCisr,and what I got from the Log window of  Core1 are always "receiving IPC from core 0",which means I can't get the message "got message %d from core 0".

Is there something wrong with this program?Someone please help me.Hoping for the reply.