OMAP3 EHCI USB HS mode performance issue

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Hi All,
 
I am using OMAP3 based board,  running git based kernel 2..6.28, and enabled "EHCI HCD (USB 2.0) support", PHY mode.
 
EHCI HS performance is measured using Catalyst, USB analyzer.   I supposed to get 480 Mbits/s(theoritically), but getting around 80 Mbits/s for write and around 128 Mbits/s for read.  Please suggest me some method/option to increase HS USB EHCI performance.
 
Thanks in advance 
Regards
Ganeshan


      

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