I am using standard function to configure clock source for msp430f5247 . It dosen't seem to be working. Same works fine in msp430f5419a? Any suggestion.

I am using following function to initialize system clock for msp430f5247 . It seems it got stuck in a second while loop as shown below.  

void Init_FLL(uint16_t fsystem, uint16_t ratio)
{
uint16_t d, dco_div_bits;
uint16_t mode = 0;

// Save actual state of FLL loop control, then disable it. This is needed to
// prevent the FLL from acting as we are making fundamental modifications to
// the clock setup.
uint16_t srRegisterState = __get_SR_register() & SCG0;
__bic_SR_register(SCG0);

d = ratio;
dco_div_bits = FLLD__2; // Have at least a divider of 2

if (fsystem > 16000) {
d >>= 1 ;
mode = 1;
}
else {
fsystem <<= 1; // fsystem = fsystem * 2
}

while (d > 512) {
dco_div_bits = dco_div_bits + FLLD0; // Set next higher div level
d >>= 1;
}

UCSCTL0 = 0x0000; // Set DCO to lowest Tap

UCSCTL2 &= ~(0x03FF); // Reset FN bits
UCSCTL2 = dco_div_bits | (d - 1);

if (fsystem <= 630) // fsystem < 0.63MHz
UCSCTL1 = DCORSEL_0;
else if (fsystem < 1250) // 0.63MHz < fsystem < 1.25MHz
UCSCTL1 = DCORSEL_1;
else if (fsystem < 2500) // 1.25MHz < fsystem < 2.5MHz
UCSCTL1 = DCORSEL_2;
else if (fsystem < 5000) // 2.5MHz < fsystem < 5MHz
UCSCTL1 = DCORSEL_3;
else if (fsystem < 10000) // 5MHz < fsystem < 10MHz
UCSCTL1 = DCORSEL_4;
else if (fsystem < 20000) // 10MHz < fsystem < 20MHz
UCSCTL1 = DCORSEL_5;
else if (fsystem < 40000) // 20MHz < fsystem < 40MHz
UCSCTL1 = DCORSEL_6;
else
UCSCTL1 = DCORSEL_7;

while (SFRIFG1 & OFIFG) { // Check OFIFG fault flag
UCSCTL7 &= ~(DCOFFG+XT1LFOFFG+XT2OFFG); // Clear OSC flaut Flags
SFRIFG1 &= ~OFIFG; // Clear OFIFG fault flag
}

if (mode == 1) {
UCSCTL4 = (UCSCTL4 & ~(SELM_7 + SELS_7)) | (SELM__DCOCLK + SELS__DCOCLK);
}
else {
UCSCTL4 = (UCSCTL4 & ~(SELM_7 + SELS_7)) | (SELM__DCOCLKDIV + SELS__DCOCLKDIV);
}

__bis_SR_register(srRegisterState); // Restore previous SCG0
}

Please point out if I am doing anything wrong here. Same function works fine on msp430f5419a in our other boards. I was thinking that since both controller are from same family this should work as it is.