[Gumstix-users] udev and persistence of device files

[Skeptic <per...@br...>]

I have a Huawei USB GSM modem which normally creates 4 ttyUSBn device files
where n may be 0..3 or 1..4 depending on if the FTDI USB driver of an
Android card is detected last or first.

I believed that adding an udev-rule should give me a known device filename
if the rule requirements were met - and no device file name if not. 

Yes, it worked - but I can boot the overo without the hardware attached, and
the device filenames are still there!

Is this a bug or a feature? I believed udev should populate the /dev catalog
only with devices that are present?

What have I missed?

Here is my rule:

DRIVERS=="option", ATTRS{bInterfaceNumber}=="00", NAME="ttyMODEM0"
DRIVERS=="option", ATTRS{bInterfaceNumber}=="01", NAME="ttyMODEM1"
DRIVERS=="option", ATTRS{bInterfaceNumber}=="02", NAME="ttyMODEM2"
DRIVERS=="option", ATTRS{bInterfaceNumber}=="03", NAME="ttyMODEM3"
ATTRS{product}=="FT232R USB UART", ATTRS{serial}=="A400g2EY", NAME="ttyAVR"


Regards
Per



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