RE: MPC8360E USB Host Controller Driver

-----Original Message-----
From: Alex Zeffertt [mailto:ajz@cambridgebroadband.com]=20
Sent: Thursday, September 07, 2006 6:59 PM
To: Li Yang-r58472
Cc: n.balaji@gdatech.co.in; linuxppc-embedded@ozlabs.org
Subject: Re: MPC8360E USB Host Controller Driver
=20

quoted

quoted

manual, they told that this controller does not belong to UHCI or=20
OHCI standard.

=20
Yes, you can call it FHCI if you like. :)

=20
I heard that on the PQII (82xx) devices the FHCI required=20
intervention from the core, even when there was zero traffic=20
on the USB.  I think this was because the core had to=20
continuously service a 1ms interrupt.  This generates=20
significant extra loading, making it worth considering using=20
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.

=20
Does anyone know if this is still the case with the PQII Pro (83xx)?

834x has a integrated EHCI controller instead.

- Leo