I think I see an error in the serial driver for the Au1100. In the function serial8250_isa_init_ports() there is the line: up->port.uartclk = get_au1x00_uart_baud_base(); Shouldn't this be: up->port.uartclk = get_au1x00_uart_baud_base() * 16; Isn't the UART clock (normally) 16x the baud_base for this (and most) UARTs? Also... beware of: baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); quot = serial8250_get_divisor(port, baud); quot = 0x35; /* FIXME */ For me, 0x35 is not correct. For me, the above 16x fix eliminates the need for this kind of FIXME. Greg -- Gregory Nutt <greg.nutt@xxxxxxxxxxx> Cadenux, LLC