[maemo-developers] [maemo-developers] RNDIS, CDC, usbnet, usb in host mode

From: Ian Smith ianster at gmail.com
Date: Wed Dec 27 20:48:10 EET 2006
I was wondering if anyone knew how to "switch" a N770 (scirocco) to  
use CDC (via usbnet) when it is in USB host mode?


I have another linux box (PXA-based) that is a USB client only and it  
speaks CDC_subset over USB.  I would like the N770 to speak IP with  
it, which it refuses to do at present.

I used flasher-2.0 to set my nokia to host mode.  I confirmed that  
N770 works correctly with a Human Interface Device (a USB keyboard).  
I'm using the "voltage hack" from the UCLA folks.

Both of the devices (when the n770 is not in USB host mode) work  
properly with a standard laptop linux box and can be pinged or I can  
SSH to them no problem.

Both of the devices can be reached via their other interfaces without  
problems (bluetooth to my local device, wlan to the nokia).

What worries me about the N770 is that when one uses the "switcher"  
to switch to USB net when the N770 is a USB host I get this in dmesg:

[xxx] usb0: RNDIS ready

Seems like somehow it wants to speak RNDIS when in host mode... but  
it speaks CDC when in client mode!

I do get some worrying messages when I connect up my PXA linux box to  
my n770 (which is in host mode).  This is the part of dmesg:

[xxx]: usb 1-1: new full speed USB device using ohci and address 11
[xxx]  usb 1-1: device v049f p505a is not supported
[xxx]  usb 1-1: configuration #1 chosen from 1 choice

If anybody can suggest where to turn on this issue, I'd really  
appreciate it....


Ian Smith
iansmith at acm.org
We've seen everything there is to see, from Bangkok to Calgary.

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