IFPGA_UART_CLK
int ifpga_uart_clk = IFPGA_UART_CLK;
sc->sc_frequency = IFPGA_UART_CLK;
if (plcomcnattach(&ifpga_pi1, plcomcnspeed, IFPGA_UART_CLK,
if (plcomcnattach(&ifpga_pi1, plcomcnspeed, IFPGA_UART_CLK,