serial port mystery

[Bob Chiodini]

On Sun, 2005-04-03 at 18:00 -0500, Bill McCormick wrote:
> Sometime ago I upgraded to FC3 from RedHat 9 to, among other reasons,
> get my VScom PCI 2 port serial card working.
> 
> (RedHat 9 required a kernel re-compile)
> 
> Anyway FC3 made it work. The two ports have been working for sometime on
> /dev/ttyS4 & 5. Now, inexplicably (after a reboot test) the 2 ports
> insist on using /dev/ttyS14 & 15.
> 
> I removed my rc.serial ...
> 
> <reference>
> [root at billinux ~]# cat /tmp/rc.serial
> setserial /dev/ttyS4 port 0xeca8 autoconfig
> setserial /dev/ttyS5 port 0xec98 autoconfig
> </reference>
> 
> ... and still they come up as ttyS14 & 15.
> 
> Somehow, the kernel must be doing this. But how? ACPI?  Where is the
> config?
> How might this have changed? yum?
> Can I still use a rc.serial?
> How can I get the ports permissions set to 666?
> 
> <reference from: dmesg>
> ACPI: PCI interrupt 0000:00:04.0[A] -> GSI 25 (level, low) -> IRQ 177
> ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
> ttyS14 at I/O 0xeca8 (irq = 177) is a 16550A
> ttyS15 at I/O 0xec98 (irq = 177) is a 16550A
> ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
> </reference>

Bill,

Once you figure out the devices names, the default permissions can be
set in /etc/udev/permissions.d/50-local.permissions.  Add a line like:

ttyS*:root:uucp:0660

Change the 0660 as you need.

Bob...