FCC Authentication with umbim
bjorn at mork.no
Sun Jun 5 19:24:39 UTC 2016
Fabian Schörghofer <fabian.schoergi at gmail.com> writes:
> I have an EM7455 here from or better with Lenovo settings applied. How
> to deactivate the FCC check? The device will not be used in a Lenovo
> laptop anymore, so no problem with the notebook not be booting anymore.
> Bjørn wrote that the FCC_AUTH can be deactivated in the settings:
I shouldn't have written that :) It seems very likely, but we don't
>> learn a bit about these modems, and I did notice that there is a
>> FCC_AUTH => 01
>> setting in the
>> file (which AFAIU contains all the Lenovo specific settings).
> How can this be achieved? Is there a "settings editor"?
I assume there is, but I've never seen one. It is either a tool provided
to OEM vendors, or maybe just an internal tool for Sierra. What I
observe is that laptop vendors like Lenovo and Dell include such .nvu
files as part of their driver/firmware packages.
Now I have been fiddling a bit with the files to try to understand the
format, and had some success with creating similar files. But there is
a lot I don't know, so any experiment has a significant chance of
bricking the modem. Personally I don't think it's worth the risk for a
modem you are not prepared to replace...
> I know this might be the wrong place to ask,
The OpenWrt or LEDE developement lists would probably be better, but I
haven't seen anyone here have a problem with a few umbim discussions.
libmbim and umbim are so different that it's not like they really
compete in any way. They solve different problems.
> but if the above is not
> possible, would it be possible to send the FCC Auth with umbim? The
> library hasn't been updated recently, so I don't think this is as of now
Implementing this in umbim is on my TODO list. Which means that I might
do it in a couple of years :)
I don't think it makes sense to add the full QMI proxying thing in
umbim, since there is no matching libqmi library. A simpler approach,
just implementing the necessary QMI messages inside umbim, is probably
fine. Should not be too much work if anyone wants to get their feet
wet. I think it would be good for umbim if it got more developer action
than an occasional patch from John or me.. Especially since I don't use
umbim myself, except for testing.
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