Use a specific device ?

[Jean-Christian de Rivaz]

Le 05. 06. 15 13:18, Aleksander Morgado a écrit :
> On Tue, May 26, 2015 at 12:19 AM, Jean-Christian de Rivaz <jc at eclis.ch> wrote:
>> I have a system where the modem have multiple /dev/ttyACMx ports where x is
>> not constant because of the dynamic nature of others serial devices.
> It may be worth noting that a very similar issue with the one faced
> here is the one with network interface names, where interface names
> were created as kernel drivers probed the different interfaces, ending
> up with "eth0", "eth1" and so on. Then, there would be network
> interface configurations for each network interface based on the name,
> but no one really ensured that the name was the same upon reboots. The
> solution provided by systemd to ensure that the proper configuration
> is applied always to the proper interface is to make the device names
> "predictable", see:
> http://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames/
>
> This solution avoids the need of any other udev rules to e.g. create
> network interface names containing the device MAC address or what not.
>
> I'm wondering whether the same could be applied not only to network
> interfaces, but also to ttyACMs, ttyUSBs and cdc-wdms, and end up
> having predictable tty names like e.g. /dev/ttyACMp0s20u4i0. Sure,
> those names are a nightmare to type, but they are predictable (e.g. in
> this case by including the physical location of the connector of the
> hardware).
>

This would be a wonderful solution. The only problem is when will this 
feature be available in a stable Linux kernel widely used by all majors 
distributions? Until this dream happens (probably not before severals 
years I guess), an other option must be implemented.

Jean-Christian