LCR_DLAB
CSR_WRITE(com_port, com_lctl, LCR_DLAB);
OUTB(com_cfcr, LCR_DLAB);
bus_space_write_1(bst, bsh, com_lctl, LCR_DLAB);
REGWRITE_1(VR4181_SIU_ADDR, com_lcr, LCR_DLAB);
outb(combase + com_cfcr, LCR_DLAB);
com0addr[com_lctl] = htole32(LCR_DLAB);
com0addr[com_lctl] = htobe32(LCR_DLAB);
bus_space_write_1(iot, ioh, com_lcr, LCR_DLAB);
OUTP(LCR, INP(LCR) | LCR_DLAB);
OUTP(LCR, INP(LCR) & ~LCR_DLAB);
CSR_WRITE(com_port, com_lctl, LCR_DLAB);
bus_space_write_1(&genppc_isa_io_space_tag, comh, com_cfcr, LCR_DLAB);
CSR_WRITE_1(regsp, COM_REG_LCR, sc->sc_lcr | LCR_DLAB);
CSR_WRITE_1(regsp, COM_REG_LCR, sc->sc_lcr | LCR_DLAB);
CSR_WRITE_1(regsp, COM_REG_LCR, sc->sc_lcr | LCR_DLAB);
CSR_WRITE_1(regsp, COM_REG_LCR, LCR_DLAB);
lcr | LCR_DLAB);
lcr & ~LCR_DLAB);
CSR_WRITE_1(regsp, COM_REG_LCR, lcr | LCR_DLAB);