AR_PHY_65NM_CH0_BB1
osdac_ch0 = (REG_READ(ah, AR_PHY_65NM_CH0_BB1) >> 30) & 0x3;
val = REG_READ(ah, AR_PHY_65NM_CH0_BB1) & 0x3fffffff;
REG_WRITE(ah, AR_PHY_65NM_CH0_BB1, val);