Re: Sierra wireless Model: MC8790 qmi_wwan? Howto to test?

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On Wed, 2012-05-16 at 22:58 +0200, Thomas Schäfer wrote:
> 
> Am Mittwoch, 16. Mai 2012, 22:36:01 schrieben Sie:
> > On Sat, 2012-05-12 at 21:38 +0200, Thomas Schäfer wrote:
> > > Hi,
> > > 
> > > the new qmi-wwan-driver supports a lot of hardware.
> > 
> > It only supports hardware based on newer Qualcomm chipsets that speak
> > the proprietary QMI protocol, which is mainly for MSM72xx, 8xxx, and
> > 9xxx.
> > 
> 
> > This device is already supported by the 'sierra' serial driver.  The IDs
> > were added to the kernel on 2009-06-11 and was part of the 2.6.31 and
> > later kernels.  Unless your kernel is really, really old, it should
> > already work.
> 
> 
> It does work without problems(ppp). But the wwan-interface looks nicer/faster 
> :-)

It is faster.  But your device doesn't support it :(

> 
> 
> > This indicates that the device is based on the Qualcomm MSM6290 chip,
> > which does not support QMI.  This generation of Sierra devices only
> > speak DIAG, CnS, and AT.  And obviously you've found one of the
> > AT-capable ports, so that indicates the modem is already supported by
> > the 'sierra' driver.
> 
> > No, this device cannot be supported by qmi-wwan because it does not
> > speak QMI. 
> 
> 
> That was the  thing I want to know. 
> The second qustion was, how to get this information the easy way. Because the 
> year of manufacturing is a bad indicator - the quite old ZTE K3565-Z supports 
> the new wwan/qmi-interface, of course also working with ppp for years.

Actually, the K3565-Z doesn't support QMI either :)  It does have the
possibility of a pseudo-ethernet port, but that's a custom
implementation by ZTE's firmware team that isn't at all QMI related.
Thankfully on the K3565-Z it's more or less standard and we don't have
to go to the lengths to support it that we do for QMI-based devices.  It
appears the K3565-Z is based on the MDM6290 which is the same chipset
that's in your Sierra 8790 :)  Thus no QMI.

(Technically QMI and pseudo-ethernet interfaces are completely
unrelated, it just happens that every Qualcomm-derived device that
supports QMI has the capability of a pseudo-ethernet interface even if
the OEM's firmware team doesn't actually expose it.)

Dan

> Thanks a lot for your clarification.
> 
> Regards,
> 
> Thomas
> 
> 
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