RA_UART_FREQ
(RA_UART_FREQ / RA_SERIAL_CLKDIV / RA_BAUDRATE)
sc->sc_frequency = RA_UART_FREQ;
(RA_UART_FREQ / RA_SERIAL_CLKDIV / RA_BAUDRATE) & 0xffff);
((RA_UART_FREQ / RA_SERIAL_CLKDIV / RA_BAUDRATE) & 0xffff) >> 8);
comcnattach1(®s, RA_BAUDRATE, RA_UART_FREQ,
comcnattach1(®s, RA_BAUDRATE, RA_UART_FREQ,