autoloading of kernel modules in the udev area ?!
Bill Nottingham
notting at redhat.com
Tue Nov 13 20:28:44 UTC 2007
Hans de Goede (j.w.r.degoede at hhs.nl) said:
>> What are the modules that live behind that device?
>
> The module / driver behind it us i2c-dev, which gives userspace access to
> one ore more i2c-busses. So the chain basically is:
> -userspace app (i2cdump for example) -> i2c-dev -> i2c master driver
> (i2c-i801
> for example).
>
> Notice that under normal circumstances userspace access to the i2c busses
> is not used, its main use is as a debugging / development technique.
So, i2c-i801 is automatically loaded, but i2c-dev isn't?
If it's not needed by default, I suppose the device node + kmod is one
way to do it; you could also build it statically if you really want
to. Why wouldn't i2c-dev be part of i2c-core anyway?
> Interesting this seems to be different from adding entries under
> /lib/udev/devices, as as said on my system after dev the loop module gets
> loaded, while I assume its not used during boot. Wouldn't it be better
> (faster, less memory use) for the loop-devices to sit under
> /lib/udev/devices, so that no module gets loaded?
I'm not seeing it getting loaded by default for me. Did you set up
a loop device?
Bill
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