usb & udev

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Hi all,

When I plug my board with the FT232R chip from FTDI (USB to serial) a
module named usbserial.ko and ftdi_sio.ko is inserted automatically.

I saw in udev rules that this is the line responsible for doing that:

# Load drivers that match kernel-supplied alias
ENV{MODALIAS}=="?*",                    RUN+="/sbin/modprobe -Q $env{MODALIAS}"

What I want to know is who send this for udev? usbcore module?

The variable $env{MODALIAS} is something like this:

                 usb:v0403p6001d0600dc00dsc00dp00icFFiscFFipFF

v0403 is the vendor ID, p6001 is the product ID, but the others? I
didnt find anything about this in modprobe or udev docs....

Thanks,

-- 
Alemao
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