Eric wrote: > setserial -a give me: > > /dev/ttyS1, Line 1, Uart: 16550A, Port: 0x0000, IRQ: 121 > Baud_base: 454545 close_delay:50 divisor: 0 > closing_wait: 3000 > Flags: spd_normal 459 printf("%s uart %s port 0x%.4x irq %d baud_base %d", device, 460 serial_type(serinfo.type), serinfo.port, For PCI, Port address is a 32-bit value, not 16-bit. See /proc/ioports output. This is a bug in setserial though I don't think it's causing the problem you are seeing. grant