Serial port problem

[atamer]

Hello
I am stuck with my serial port , I need some help please

I am using a linux version from lfs and my linux can not detect any serial port.
I have read lots of article about it, What i understand is kernel (2.6 for me) detects serial ports automatically.
I looked at my bios settings and there are serial ports which are set to irqs however "dmesg | grep ttys" is not showing any ttys output,
I also looked at /proc/devices here is output

Character devices:
1 mem
2 pty
3 ttyp
4 /dev/vc/0
4 tty
5 /dev/tty
5 /dev/console
5 /dev/ptmx
7 vcs
10 misc
13 input
21 sg
29 fb
128 ptm
136 pts
180 usb
189 usb_device

I install setserial proc however dont want to use it without knowing what I am doing . Could you describe how can I setup a serial port on my linux.
Thank you

[Rubberman]

There are no entries in /dev like /dev/ttyS0, /dev/ttyS1, etc? What kernel are you running (you can find out with the command uname -r)?

[sooset]

You can't get ttyS0... by reading /proc/devices, I think 'ls -l /dev/ ', you can find your
ttyS0 ttyS1 ..and so on, you can use minicom to use it .

[clickit]

Try ls -l /dev/* | grep -i ttyS it is a bit shorter listing.
By any chance do you have a dialup modem attatched? It may well be on a serial port if so.
Baring the preceding, try "cd /proc" and "cat ioports". Scan the listing for serial and/or addresses (on the left) of 2F8 and 3F8. Those are the serial ports.