SCMD_REG_REM_READ
err = (*(sc->sc_func_write_register))(sc, SCMD_REG_REM_READ, b);
err = (*(sc->sc_func_read_register))(sc, SCMD_REG_REM_READ, &b);
#define SCMD_LAST_REG SCMD_REG_REM_READ /* The last register address on a module */
err = uart_phy_write_register(fd, debug, SCMD_REG_REM_READ, b);
err = uart_phy_read_register(fd, debug, SCMD_REG_REM_READ, &b);