SCMD_REG_REM_WRITE
err = (*(sc->sc_func_write_register))(sc, SCMD_REG_REM_WRITE, b);
err = (*(sc->sc_func_read_register))(sc, SCMD_REG_REM_WRITE, &b);
err = uart_phy_write_register(fd, debug, SCMD_REG_REM_WRITE, b);
err = uart_phy_read_register(fd, debug, SCMD_REG_REM_WRITE, &b);