/dev/ttySx problems... solved

[Jeff Vian]

On Thu, 2006-11-09 at 21:33 -0500, Gene Heskett wrote:
> On Thursday 09 November 2006 21:07, stan mcintosh wrote:
> >fredex wrote:
> >>>Stan, have you tried using setserial to examine and change the
> >>> properties of the serial port?
> >
> >I hadn't tried it until I saw your message, but I have now.  setserial
> > helped me confirm that my ports are active, especially when someone else
> > suggested that I copy a file to the serial port.  When the pins started
> > coming alive (yes, a scope still does come in handy), that confirmed
> > that the problem was not in hardware, BIOS, OS, or configuration.
> >
> >One problem was (possibly) that 'yum install' did not give the most
> > up_to_date version of PikDev.  When I 'yum removed' the old version and
> > installed a more recent RPM, pin control was fine.
> >
> >Thanks for the help.
> >
> >stan
> 
> Followup to my post of 30 seconds ago:
> [root at coyote gene]# ls -l /dev/ttyS*
> crw-rw---- 1 root uucp 4, 64 Nov  9 16:35 /dev/ttyS0
> crw------- 1 root root 4, 65 Nov  9 16:35 /dev/ttyS1
> crw------- 1 root root 4, 66 Nov  9 16:35 /dev/ttyS2
> crw------- 1 root root 4, 67 Nov  9 16:35 /dev/ttyS3
> [root at coyote gene]# setserial /dev/ttyS1
> /dev/ttyS1: No such device or address
> 
> Now I'm really scratching my ancient head, its there, but it ain't, WTH?
> 
Just because the device file exists does not mean the hardware exists.
How many physical serial ports are installed in that PC?

Many newer mobos only have one serial port, which would usually be
ttyS0.