[PATCH 0/1] Workaround for rut955 modem initialization

Reiner Karlsberg karlsberg at softart-ge.com
Mon Jun 28 20:42:56 PDT 2021


Actually, I am using the RUT955 running PPP, _not_ qmi.
For the requirement (or precaution) of a reset of the modem, using the GPIO for the RUT955
looks like the proper solution to go.

In the opposite, ZBT confirmed, that on their WE826 there is no wiring
to (power-)reset the installed Quectel EC25.

Could you please publish a complete shell-script on the openwrt forum, using the GPIO on the RUT955
to reset the EC25 ?


Reiner Karlsberg

Am 29.06.2021 um 01:38 schrieb Daniel Golle:
> On Mon, Jun 28, 2021 at 02:19:11PM +0200, John Crispin wrote:
>> On 28.06.21 13:56, Ontje.Luensdorf at dlr.de wrote:
>>> This will probably affect all other modems and we are not sure if this may cause
>>> side-effects on other devices.
>> As similar problem can be observed when looking at swconfig. some switches
>> need a reset, others do not. for this purpose an "option reset 0/1" was
>> introduced in uci. In this case maybe "modem_reset" might be a good option.
> This particular device (Teltonika RUT955) got a dedicated reset line for
> the USB-connected internal Quectel EC-25 modem available as GPIO which
> could be toggled on boot if needed (in user-space or by wiring up
> device-tree magic doing that).
> That's more reliable than using QMI to trigger the reset, and also more
> generic in terms of people not even using 'uqmi' on that device.
> Cheers
> Daniel
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