[PATCH 0/3] PIN operations with UIM service for the MC7455

[Bjørn Mork]

Aleksander Morgado <aleksander at aleksander.es> writes:

>> I did some more experimenting and found that an "USB reset" somehow
>> resolves this problem as well.  It will reset the USB bus connection,
>> causing drivers to unbind and rebind and therefore a full new modem
>> discovery by MM.  But it doesn't actually reset the modem, so the SIM
>> state is unlocked.
>>
>> My working theory at the moment is that this is just another symptom of
>> the firmware issue that makes the AT port go unresponsive. That problem
>> is also "fixed" by an USB reset. There is certainly something fishy
>> going on there, but it is not something we can fix on the host side of
>> the equation.  So please ignore.
>>
>
> Did you talk to Sierra already about the reset needed for the AT port?

Not really.  I did mention it, but I think it might have been hidden in
too much other nonsense I wrote at the same time :)

I'm really hoping for a publicly avaialble firmware soon.


>> FWIW, the issue could be either the now outdated firmware (which I
>> believe is not distributed widely enough to be a real problem), or the
>> missing USB3 bus connection.  But you haven't seen anything similar,
>> have you?
>>
>
> I have not actually tested the patches with a full connection attempt;
> I'm roaming without a proper data sim card to test with :/

Ouch.  Yes, I can see the need to be careful then.  You definitely don't
want to do any speed testing while roaming.  I see from
https://en.wikipedia.org/wiki/European_Union_roaming_regulations
that the current maximum per MB is 0.20 euros.  So that would be 7.50
euros per second if you max out the MC7455 :)


Bjørn