SIBA_CC_PMUCTL_ILP
pmu &= ~(SIBA_CC_PMUCTL_ILP | SIBA_CC_PMUCTL_XF);
SIBA_CC_PMUCTL_ILP;
pmu &= ~SIBA_CC_PMUCTL_ILP;
pmu |= (((xtalfreq + 127) / 128 - 1) << 16) & SIBA_CC_PMUCTL_ILP;