[PATCH 0/3] PIN operations with UIM service for the MC7455
Bjørn Mork
bjorn at mork.no
Mon Feb 1 09:19:25 PST 2016
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 FWIW, the issue could be either the now outdated firmware (which I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
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