Message-ID: <3E6CD8B1.5070300@jpl.nasa.gov>
Date: Mon, 10 Mar 2003 10:25:53 -0800
From: Bryan Whitehead <driver@jpl.nasa.gov>
Organization: Jet Propulsion Laboratory
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To: "Adam J. Richter" <adam@yggdrasil.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: devfs + PCI serial card = no extra serial ports
References: <200303081948.LAA05459@adam.yggdrasil.com>
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[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 ?

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

>         Another approach, which I think provides a little more
> information to users, makes for a more readable /dev tree and should
> make some programs a few cycles faster would be to what my version of
> /dev/loop does (not the one currently in Linus's tree, alas): start by
> just creating /dev/tts/0, and then create /dev/tts/n+1 whenever
> /dev/tts/n is assigned and /dev/tts/n+1 has not already been defined.
> For /dev/loop, it was also useful to have the extra devices unregister
> when the highest number device became undefined (if a device in the
> middle were de-defined, it would not disappear until all higher
> numbered devices were also de-defined).
> 
>         Is this the issue, or do I misunderstand?
> 
> 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."
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-- 
Bryan Whitehead
SysAdmin - JPL - Interferometry Systems and Technology
Phone: 818 354 2903
driver@jpl.nasa.gov

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