Re: [gentoo-user] serial port identification question

[Dale]

David Relson wrote:
> On Fri, 25 Dec 2009 14:10:46 -0600
> Dale wrote:
>
>
>> David Relson wrote:
>>
>>> My mobo has two serial ports.
>>>
>>> As reported by hwinfo they are:
>>>
>>>   Serial Port 0: 0x3f8
>>>   Serial Port 1: 0x2f8
>>>
>>> After booting the machine, dmesg indicates that tty0 is the console
>>> with message:
>>>
>>>     console [tty0] enabled
>>>
>>> /dev names a multitude of tty devices,
>>> i.e. /dev/tty0, /dev/tty1, ...
>>>
>>> How do I determine which devices correspond to the serial ports?
>>>
>>> Thanks.
>>>
>>> David
>>>
>>>
>>>
>> Mine is /dev/ttyS0 and /dev/ttyS1 .  I put both devices so you will
>> notice what is alpha and what is numeric.  Also note the S is capitol
>> as well.
>>
>> Dale
>>
>> :-)  :-)
>>
>
> My /dev/tty* didn't include any /dev/ttyS* entries.  Searching the web,
> I learned that "MAKEDEV /dev/ttyS0" and "MAKEDEV /dev/ttyS1" will
> create the missing entries and that "stty -F /dev/ttyS0 -a" will
> provide configuration information for the port.
>
> My little Serial.cpp class is now successfully writing to the port (as
> proved by my son running Hyperterminal and receiving the sent
> characters).  However, receiving characters isn't yet working.
> Neither his hyperterminal nor my sender (with a loopback plug) is
> receiving.
>
>

Are you sure you enabled this in the kernel?  It is under   Device 
Drivers > Character devices > Serial Drivers then enable these:

<*> 8250/16550 and compatible serial support
(4) Maximum number of 8250/16550 serial ports
(4) Number of 8250/16550 serial ports to register at runtime

At least that works for my dial-up modem and my UPS.

You may be able to put two instead of four but as I said, it works here 
like this.  I only have two ports tho.

Dale

:-)  :-)