MPC8360E USB Host Controller Driver
Claus Gindhart
claus.gindhart at kontron.com
Thu Sep 7 21:12:05 EST 2006
Hi all,
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).
--
Mit freundlichen Gruessen / Best regards
Claus Gindhart
SW R&D
Kontron Modular Computers
phone :++49 (0)8341-803-374
mailto:claus.gindhart at kontron-modular.com
http://www.kontron.com
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-----Original Message-----
From: linuxppc-embedded-bounces+claus.gindhart=kontron.com at ozlabs.org
[mailto:linuxppc-embedded-bounces+claus.gindhart=kontron.com at ozlabs.org]
On Behalf Of Alex Zeffertt
Sent: Donnerstag, 7. September 2006 12:59
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....
Does anyone know if this is still the case with the PQII Pro (83xx)?
Alex
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