Re: How to get a list of all available serial ports?

[Jan-Benedict Glaw <jbglaw@lug-owl.de>]

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On Thu, 2004-08-26 12:52:27 +0200, Salomon, Frank <frank.salomon@wincor-nixdorf.com>
wrote in message <412DC0EB.1090605@wincor-nixdorf.com>:
> hi,
> 
> cat /proc/ioports and serach serial
> 
[...]
> 02f8-02ff : serial(auto)
[...]
> 03f8-03ff : serial(auto)

That's *very* unreliable. There are a lot of UARTs that handle more than
one serial port within one I/O space or PCI bar, so you'd "miss" those.
To be honest, I think that quite a lot of the non-8250 UARTs will
actually handle more than one serial port...

> or cat /proc/tty/driver/serial
> 
> serinfo:1.0 driver:5.05c revision:2001-07-08
> 0: uart:16550A port:3F8 irq:4 baud:9600 tx:11 rx:0
> 1: uart:16550A port:2F8 irq:3 baud:9600 tx:11 rx:0

I actually think that this is one of the mest methods to find out about
serial ports from userspace (among letting the user specify the correct
device node for it:-)  Also (just as a hint), don't really worry about
I/O address, uart type (as long as it isn't "unknown") or IRQ. It's
somewhat architecture dependant (eg. Sparc64 used to show off vector
addresses instead of IRQ numbers, so you'd see an address instead...).

MfG, JBG

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