Re: Help on MPC82XX USB Host controller Development using m82xx-hcd.

Laurent Pinchart-4 wrote:

The good news is that Anton Vorontsov wrote and posted a FHCI driver for 
QE-based parts on the linux-ppc mailing list (search the archive for
"[PATCH] 
Freescale QUICC Engine USB Host Controller"). The driver can be easily 
modified to work with CPM2-based parts.

The bad news is that, from my experience with the CPM2, the controller is 
almost unusable. It eats around 40% CPU time on my MPC8248 system, and 
requires software help to generate SOF tokens, which results in bad SOF 
tokens being sent on the bus. Most USB disks don't seem to care, but all
the 
USB Bluetooth host controllers I've tested crashed.

We will be looking for an external USB host controller (or even another
CPU) 
for the next revision of the design.

oh.. woww.. great info...  :) :) thanks a million.. 
Right now I am just trying to get a USB -WiFi adapter working with EP8248
board.  Did you have a go at any USB WiFi devices?

Yes hogging processor for 40% of time is a big issue...I guess at this
moment I don't have any other options like respining or using 83xx
processors so I would like to give a try with this once.  Do you have a
patch for getting the CPM2 posted any where? If not can you send me the
patch.

Thanks and Regards 
Naren.



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