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From: Andrey Borzenkov <arvidjaar@mail.ru>
To: linux-kernel@vger.kernel.org
Subject: 2.6.0-test3: extra ttyS in /sys/class/tty
Date: Thu, 14 Aug 2003 18:55:31 +0400
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{pts/1}% dmesg | grep ttyS
ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
ttyS2 at I/O 0xd000 (irq = 9) is a 16550A

{pts/1}% l -d /sys/class/tty/ttyS*
/sys/class/tty/ttyS0/  /sys/class/tty/ttyS1/  /sys/class/tty/ttyS2/
/sys/class/tty/ttyS3/
{pts/1}% cat /sys/class/tty/ttyS*/dev
4:64
4:65
4:66
4:67

not that I find sysfs that useful for cdevs in general but I am just curiouos 
- where does it come from?

I have irtty_sir loaded if it matters.

-andrey