REGWRITE_1
REGWRITE_1(VR4181_SIU_ADDR, com_data, c);
REGWRITE_1(VR4181_SIU_ADDR, com_lcr, LCR_DLAB);
REGWRITE_1(VR4181_SIU_ADDR, com_dlbl, rate);
REGWRITE_1(VR4181_SIU_ADDR, com_dlbh, rate >> 8);
REGWRITE_1(VR4181_SIU_ADDR, com_lcr, LCR_8BITS);
REGWRITE_1(VR4181_SIU_ADDR, com_ier, 0);
REGWRITE_1(VR4181_SIU_ADDR, com_fifo,
REGWRITE_1(VR4181_SIU_ADDR, com_mcr, MCR_DTR | MCR_RTS);
#define bus_space_write_1(iot, ioh, off, val) REGWRITE_1((ioh), (off), (val))
#define CS_WRITE_1(off, val) REGWRITE_1(CS_IO_BASE, (off), (val))