R_DUART_IMR_A
#define R_BCM1480_DUART_IMRREG(chan) (R_DUART_IMR_A + ((chan)&1)*DUART_IMRISR_SPACING)
#define R_DUART_IMRREG(chan) (R_DUART_IMR_A + (chan)*DUART_IMRISR_SPACING)