yeah, and just adding to what Satyakaam sir said,
after 2.6.31 usb 3.0 support was added up,
you can also check from you system configuration file in /boot
you may find macros like CONFIG_USB_ARCH_HAS_XHCI i.e. extensible host
controller interface is enabled or not.
AFAIK, this is thought to be responsible for the superspeed of USB..


On Mon, Sep 3, 2012 at 7:10 AM, satyaakam goswami <[email protected]>wrote:

> On Sun, Sep 2, 2012 at 11:14 PM, Deepak Sisodiya
> <[email protected]> wrote:
> > does linux kernal 2.6.38-15 support USB 3.0 for external hard disk
>
> Simple answer yes it does according to
> http://askubuntu.com/questions/12139/does-ubuntu-support-usb-3-0 , but
> i was more curious about your question and wanted to dig a bit more
> and know where exactly is it defined in the code ? so found the code
> in here http://lxr.free-electrons.com/source/drivers/usb/host/?v=2.6.38
> i will not point to the exact piece where it is defined i would leave
> that as an exercise to  the budding kernel hackers on the group.
>
> keep these kind of questions  coming at least this way we will  look
> at the kernel code and learn in the process . for the people with
> academic interest it is because of this spec
> http://www.intel.com/technology/usb/xhcispec.htm  we have  support for
> USB 3.0 .
>
> cheers
>
> -Satya
> fossevents.in
>
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