Question about Gobiserial Vs qmi_wwan

Gopakumar Choorakkot Edakkunni gopakumar.c.e at
Fri Aug 15 11:30:44 PDT 2014

Thanks for the response, great blog post ! Even for the Gobinet driver, for
some devices like Pantech UML295, I dont even see them putting a linux gobi
driver for that in their webpage .. Looks like other than netgear (ie old
sierra wireless), no one seems to be really putting the vendor specific
version of GobiNet driver on their website !!

Now in this whole scheme of things, where does the sierra_net.c stand ? I
see that netgear  packages sierra.c (serial) and sierra_net.c (direct ip)
as their drivers for some of their models, and GobiNet as their driver for
some other models. So is sierra.c and sierra_net.c the driver which was
created before GobiNet and then later GobiNet became the standard vendor
provided driver which provides the same functionality as sierra.c and
sierra_net.c ?  Also I see that the sierra_net.c is still used along with
qmmi/cdc modules - I guess the sierra_net.c is used for the ethernet/data
portion and qmmi/cdc is purely for management/control ?


On Fri, Aug 15, 2014 at 9:31 AM, Aleksander Morgado <
aleksander at> wrote:

> On Fri, Aug 15, 2014 at 3:52 PM, Gopakumar Choorakkot Edakkunni
> <gopakumar.c.e at> wrote:
> >
> >>>> No, I Sierra Wireless do definitely test their Linux drivers.  And
> they
> >>>> do provide support for them (in the embedded market).  So the
> >>>> GobiSerial/GobiNet drivers *might* be the correct choice for some
> users,
> >
> > So does the Gobinet driver that I get for example from the Netgear AC340U
> > product page - does that work for ALL classes of Sierra devices or does
> > Netgear or other vendors (huawei etc..) put in their own fixes on top and
> > repackage it and put it on their website ? Or is there some other place
> > where qualcomm maintains a gobinet driver which is the latest and
> greatest
> > and supports netgear and huawei and pantech and etc.. etc.. ?
> More or less on-topic, I wrote a blogpost about this not long ago:
> There is a 'qualcomm' GobiNet, in the CodeAurora project page, but
> every vendor keeps its own. E.g. Sierra will modify the stock GobiNet
> at least to add their specific VID/PID matches as well as their unique
> USB interface layouts. I guess others do this as well. Sierra actually
> also decided to port a fix that Bjørn did in the upstream qmi_wwan
> driver, but don't know if others did that as well.
> From my POV, there are reasons to use GobiNet instead of qmi_wwan
> (e.g. if you're looking for the vendor-provided product support), or
> other things which we currently don't support yet (like firmware
> loading)... apart from those, I'd really suggest to use qmi_wwan and
> libqmi (with qmicli and/or ModemManager :) ).
> --
> Aleksander
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