Re: [PATCH] USB: option: Add USB ID for Novatel Ovation MC551

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On Fri, 2012-06-22 at 19:10 +0200, Bjørn Mork wrote:
> Dan Williams <dcbw@xxxxxxxxxx> writes:
> 
> > I'll do some Windows traces to see if it does use QMI on the Ethernet
> > endpoints.  I know it doesn't do QMI on any of the serial interfaces
> > (ff/ff/ff) based on the Windows drivers.  I could be completely wrong,
> > but I'm really expecting QMI on this device, given that it's a MDM9600.
> 
> The firmware doesn't need to export a QMI interface even if the chip
> supports it.  The Sierra Wireless MC77xx modules in Direct IP mode are
> good examples of this.  And I believe the same goes for most (all?) of
> the Sierra Wireless LTE USB sticks.  I assume they use MDM9200 or
> MDM9600 chips, but only support Sierras Direct IP protocol with HIP
> embedded in CDC instead of QMI.
> 
> There is of course always the possibility that the device can be
> switched into a "dumber" mode where QMI is available.  But you'll
> probably need a hint from the vendor to find out how that can be done,
> if at all possible.

Obviously, but I more meant that in the absence of some vendor
proprietary protocol like HIP, I have to believe the device does QMI.  I
know the AT command set of this device is somewhat limited, and the only
other serial ports are DM ports and GPS, and DM/DIAG isn't extremely
useful with LTE devices because it's been largely replaced by QMI.
Thus, I expected to find a QMI interface somewhere.  And it has one.

Dan


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