IOMD_IOCR
if (bus_space_subregion(iot, ioh, IOMD_IOCR, 4, &ia.ia_iic.ia_ioh))
#define IOMDIIC_READ *(volatile uint8_t *)(IOMD_ADDRESS(IOMD_IOCR))
#define IOMDIIC_WRITE(x) *(volatile uint8_t *)(IOMD_ADDRESS(IOMD_IOCR)) = (x)