MSP430F5529: Port mapping of Port 4

Hi experts,

I'm using Port 4 for USCI_A1 Spi configuration, but in datasheet port mapping is there for port 4 so that we can use it by configuration through port mapping.

Here's what I have tried but it doesn't update P4MAP0 and so on registers can anyone please check and let me know where I'm going wrong.

const unsigned char P4mapping[8] = {
                                      PM_UCA1CLK,
                                      PM_NONE,                           // Please check down why I have used PM_NONE
                                      PM_NONE,
                                      PM_UCA1STE,             
                                      PM_UCA1SIMO,             
                                      PM_UCA1SOMI,
                                      PM_NONE,
                                      PM_NONE
                                    };

void Port_Mapping(void)
{
  unsigned char i;
  volatile unsigned char *ptr;
  __disable_interrupt();                    // Disable Interrupts before altering Port Mapping registers
  PMAPPWD = 0x02D52;                        // Enable Write-access to modify port mapping registers
 
  #ifdef PORT_MAP_RECFG                     
  PMAPCTL = PMAPRECFG;                      // Allow reconfiguration during runtime
  #endif
 
  ptr = &P4MAP0;
  for(i=0;i<8;i++)
  {
    *ptr = P4mapping[i];
    ptr++;
  }
//  P4MAP0 = PM_UCA1CLK;
//  P4MAP3 = PM_UCA1STE;
//  P4MAP4 = PM_UCA1SIMO;
//  P4MAP4 = PM_UCA1SOMI;
 
  PMAPPWD = 0;                              // Disable Write-Access to modify port mapping registers
  #ifdef PORT_MAP_EINT
  __enable_interrupt();                     // Re-enable all interrupts
  #endif
}

int main (void)
{
  int i;
  WDTCTL = WDTPW | WDTHOLD;     // Stop Watchdog
  __bis_SR_register(GIE);
  //increaseVCoreToLevel2();
  Port_Mapping();
  initClockTo1MHz();

}

Note: Here in array I have wrote there PM_NONE for some variables just because I don't want to configure that registers.

Please it's a humble reuest that let me know what wrong I'm doing so that I can fix that issue and move further to my work as I'm stuck at this portion.