MPC8360E USB Host Controller Driver

[Li Yang-r58472]

> -----Original Message-----
> From: Alex Zeffertt [mailto:ajz at cambridgebroadband.com] 
> Sent: Thursday, September 07, 2006 6:59 PM
> To: Li Yang-r58472
> Cc: n.balaji at gdatech.co.in; linuxppc-embedded at ozlabs.org
> Subject: Re: MPC8360E USB Host Controller Driver
> 
> >> manual, they told that this controller does not belong to UHCI or 
> >> OHCI standard.
> > 
> > Yes, you can call it FHCI if you like. :)
> 
> I heard that on the PQII (82xx) devices the FHCI required 
> intervention from the core, even when there was zero traffic 
> on the USB.  I think this was because the core had to 
> continuously service a 1ms interrupt.  This generates 
> significant extra loading, making it worth considering using 
> a cheap EHCI chip instead....

There are improvements on future chips with a QE.  However it is still
full-speed and need CPU intervention.  But keep in mind that USB is not
a key feature for netcomm devices which PQ is targeting.
> 
> Does anyone know if this is still the case with the PQII Pro (83xx)?

834x has a integrated EHCI controller instead.

- Leo