[OpenWrt-Devel] mbim / Sierra Wireless AirCard 340U
bjorn at mork.no
Tue Apr 7 07:38:12 EDT 2015
John Crispin <blogic at openwrt.org> writes:
> On 07/04/2015 12:31, Bjørn Mork wrote:
>> David Hutchison <dhutchison at bluemesh.net> writes:
>>> Hello John,
>>> One of our customers use the 340U, and the latest firmware
>>> revision that fixes Windows 8 support.. broke linux support (
>>> http://mtekk.us/archives/guides/netgear-aircard-340u-linux/ ) We
>>> had to downgrade the firmware on the 340u itself.
>> Is this broken on linux with libmbim+ModemManager, or only with
>> umbim? Or is it just that the new version forces MBIM mode, while
>> the older allows QMI? Or is the problem related to the QMI issues
>> discussed here:
> the bug report comes from umbim it is a segfault that happens, not nice.
Looking further into what seems to be the real problem there: The
attach + connect failing with "message not long enough" errors.
The error message is a side effect of the fixed buffer size approach
taken by umbim. It assumes that a response to attach/connect always
will have a MBIM_PACKET_SERVICE_INFO data buffer. But that depends on
the status code, as described in "10.5.10.8 STATUS CODES".
In this case, the connect message fails with:
MessageType: 0x80000003 (MBIM_COMMAND_DONE)
which I assume happens because MBIM session was closed after
initialisation. It could also be that we are missing some command
necessary to bring the modem up.
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