On 8/10/07, Michael Mauch [off-list ref] wrote:

Hi,

until 2.6.21, I had the normal assignments for ttyS0 and ttyS1:

00:08: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
00:09: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A

With 2.6.22 I get the names <-> ports/irqs the other way around:

00:08: ttyS0 at I/O 0x2f8 (irq = 3) is a 16550A
00:09: ttyS1 at I/O 0x3f8 (irq = 4) is a 16550A

Is this supposed to be that way? Should we reassign these names with
udev? udev-114 doesn't seem to have built-in rules to assign the
traditional names.

Or could it be related to some brokeness in my BIOS (ACPI/PNP)?

I'm using the 8250_pnp module (and it's the same with builtin serial
modules). I made sure that I did not accidentally change the BIOS
settings for the serial ports.

I'm using Gentoo, but on the lirc list was a Fedora user with the same
symptoms.

http://lkml.org/lkml/2007/7/25/455

YH