Re: devfs + PCI serial card = no extra serial ports

From: Adam J. Richter (adam@yggdrasil.com)
Date: Mon Mar 10 2003 - 13:37:20 EST


Bryan Whitehead wrote:
>[snip]
>> There is nothing in devfs that prevents you from registering
>> devfs devices even if they are not yet bound to specific hardware
>> (you do not need a sysfs mapping, for example). So, you should be
>> able to register /dev/tts/0..N at initialization, where N is the
>> maximum number of serial devices you want to support.

>are you saying there is a way to force devfs to make more entries in
>/dev/tts/ without any hardware being attached to the entries? Then i can
>use setserial? so on boot I'd have 4 entries in /dev/tts ?

        I don't know what you mean by "force." devfs_register does
not know (or "care") if there is a physical device associated with the
major/minor/ops that it is given.

>Or are you saying I write a script to goto /dev/tts after boot and mknod
>the ports that are missing?

        User level programs can also do mknod() calls in devfs
directories, if that is what you are referring to, so you could
do "mknod /dev/tts/3 c 4 68", for example.

        By the way, I notice that 2.5.64 with devfs already creates
/dev/tts/0 through /dev/tts/49.

Adam J. Richter __ ______________ 575 Oroville Road
adam@yggdrasil.com \ / Milpitas, California 95035
+1 408 309-6081 | g g d r a s i l United States of America
                         "Free Software For The Rest Of Us."
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/



This archive was generated by hypermail 2b29 : Sat Mar 15 2003 - 22:00:22 EST