The unmodified CCS MSP430X demo was failing with "Err: COM test" on my EXP5438 board. After some investigation, I found that the code was attempting to set the clock to 25MHz without first setting the VCORE voltage to an appropriate value.

#define configCPU_CLOCK_HZ( 25000000UL )

Also, the Init_FLL_Settle function is called with a 'magic number' that is the incorrect for the desired clock rate:

unsigned long ulCPU_Clock_KHz = ( configCPU_CLOCK_HZ / 1000UL );
...
 LFXT_Start( XT1DRIVE_0 );
Init_FLL_Settle( ( unsigned short ) ulCPU_Clock_KHz, 488 );

To fix this, I added a #define to FreeRTOSConfig.h:

#define configLFXT_CLOCK_HZ       ( 32768L )

Replaced the Init_FLL_Settle function call in main.c with this:

hal430SetSystemClock(configCPU_CLOCK_HZ, configLFXT_CLOCK_HZ);

Added HAL_PMM.C and HAL_PMM.H from TI's F5xx/6xx core library to the F5XX_6XX_Core_Lib folder.

And added this code to hal_board.c:

/**********************************************************************//**
 * @brief  Set function for MCLK frequency.
 *
 *
 * @return none
 *************************************************************************/
void hal430SetSystemClock(unsigned long req_clock_rate, unsigned long ref_clock_rate)
{
    /* Convert a Hz value to a KHz value, as required
   *  by the Init_FLL_Settle() function. */
  unsigned long ulCPU_Clock_KHz = req_clock_rate / 1000UL;

  //Make sure we aren't overclocking
  if(ulCPU_Clock_KHz > 25000L)
  {
    ulCPU_Clock_KHz = 25000L;
  }

  //Set VCore to a level sufficient for the requested clock speed.
  if(ulCPU_Clock_KHz <= 8000L)
  {
    SetVCore(PMMCOREV_0);
  }
  else if(ulCPU_Clock_KHz <= 12000L)
  {
    SetVCore(PMMCOREV_1);
  }
  else if(ulCPU_Clock_KHz <= 20000L)
  {
    SetVCore(PMMCOREV_2);
  }
  else
  {
    SetVCore(PMMCOREV_3);
  }

  //Set the DCO
  Init_FLL_Settle( ( unsigned short )ulCPU_Clock_KHz, req_clock_rate / ref_clock_rate );
}

Thanks for the feedback. I have made the changes so they don't get lost, but have not yet tried compiling.

Regards.