xHCI vs legacy usb host controllers (OHCI, UHCI, and EHCI)

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Hi,

Is it necessary to use xHCI driver for USB 3.0 host controller? I am
trying to support Transdent PNU3 (having usb 3.0 controller) in my h/w
running 2.6.16 kernel. Is it not
possible to use other legacy host controllers (ohci/uhci/ehci) already
available in  2.6.16 kernel ? Will usb 3.0 not fallback to usb 2.0
with legacy drivers ? I do not want to put my effort back-porting xhci
to old kernel until it is absolutely necessary.


thanks...
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