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Date: Thu, 07 Sep 2006 15:17:07 +0100
From: Alex Zeffertt <ajz@cambridgebroadband.com>
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To: Li Yang-r58472 <LeoLi@freescale.com>
Subject: Re: MPC8360E USB Host Controller Driver
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Cc: n.balaji@gdatech.co.in, linuxppc-embedded@ozlabs.org
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Li Yang-r58472 wrote:
>> i have a MPC8347E running with the Freescale E(F)HCI driver 
>> and Kernel 2.6.17 (Freescale LTIB).
>>
>> Because of this mail, i checked, if there are any periodical 
>> interrupts, without real USB payload.
>>
>> The result is: NO
>>
>> If i attach a USB-mouse, i get 5 interrupts.
>> If i remove it again, 1 additional.
>>
>> Nothing else, silence !
>>
>> USB works well with USB 1.1 and 2.0 devices (This was not the 
>> case with earlier Kernels, e.g. 2.6.13, because for the 
>> switching between 1.1 and 2.0 you need a transaction 
>> translator driver).
> 
> MPC834x USB is very different from the USB of CPM/QE.  It is an
> integrated EHCI controller.
> 


So, the question is still open, does the QuiccEngine HCI (a.k.a. FHCI)
generate loading on the PPC core when there is no traffic on the USB?

Alex