Netgear 340u

[Ramesh Siripurapu]

09.10.2015, 00:39, "Bjørn Mork" <bjorn at mork.no>:
> Ramesh Siripurapu <ramesh.siripurapu at aptiwiz.com> writes:
>
>>  After banging my head for a day, figured that cdc-mbim is the
>>  culprit. Once I remove that module, then everything is good. I guess
>>  that module binding to modem when it was in MBIM mode and then
>>  switching to QMI, unbinding cdc-mbim and qmi_wwan binding is causing
>>  firmware go bonkers. It isn't sending out any Bo packets although
>>  usbmon shows it is sending out Bo packets.
>
> I wish this surprised me, but it doesn't.
>
> The multiconfiguration support in these firmwares assume that the
> OS/driver selects the wanted configuration *before* they start
> communicating with the selected functions. The cdc_mbim driver will
> exchange a bit of config info when it probes an MBIM function. So if
> the configuration switch happens after cdc_mbim has started probing,
> then the firmware might not recover properly.
>
> When you say "usbmon shows it is sending out Bo packets", would that by
> any chance be a stream of empty (zero length) packets? I've see that
> from the MC7710 when doing "late" config switching.
>
> Bjørn

-- 
Sincerely,
Ramesh Siripurapu
Founder & CEO
http://www.aptiwiz.com
510 493 6394 (cell)