RESET USB : error management

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Hello,

Under Open embedded (Angstrom 05-2012) with kernel 3.2.30, I've got USB resets (on less than 1% machines).

Looking for the root cause (first hardware with intel combo lan 9514 susceptibility ...) ...

Does the kernel may generate the reset? The HUB ?
And what can be the reason?
(Data integrity, number of retry, ...?)

More: I would like to know where I can find the USB error management documentation.

Thanks,
Daniel.

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