fixeria, 01/22/2019 06:28 AM
h1. Qualcomm based cellular data modems wih Linux
*DISCLAIMER: No information here is officially provided by Qualcomm, Quectel or other modem manufacturers. It is the result of independent third-party research and should be taken with a a grain of salt*
This is the place where we gather information about the Quectel [[EC20]], [[EC21]] and [[EC25]] modules, as well as other Qualcomm based cellular modems with built-in Linux processor.
Please help us to grow this resource for the benefit of the general public.
It is a shame that Qualcomm doesn't disclose proper documentation for their products to the general public. There are many possible applications and use cases which are possible once more information about those devices is publicly available. Having the power of running customer/user-specific programs inside the Linux in the modem is very powerful, and can for example eliminate the use of a dedicated external processor in many M2M/IoT applications.
An overview of Qualcomm Gobi Modems and their specs can be found at https://www.qualcomm.com/media/documents/files/gobi-product-specs.pdf
From that table, we suspect that all cellular modem chips that have a "Cortex A5" application processor are candidates for the Qualcomm Linux based modems.
h2. Wiki structure
Please see the below auto-generated hierarchical index of wiki pages:
h2. Mailing List
We have started the email@example.com mailing list for any related discussions.
You can manage your subscription at https://lists.osmocom.org/mailman/listinfo/qc-linux-modems
h2. related reading
h3. 33C3 Talk by Holger Freyther and Harald Welte
At 33C3:"http://events.ccc.de/congress/2016", Holger and Harald first publicly presented about this project.
* Video Recording: https://media.ccc.de/v/33c3-8151-dissecting_modern_3g_4g_cellular_modems
* Slides (PDF): https://fahrplan.events.ccc.de/congress/2016/Fahrplan/system/event_attachments/attachments/000/003/151/original/Dissecting_modern_%283G_4G%29_cellular_modems.pdf
* Slides (HTML): http://git.gnumonks.org/laforge-slides/plain/2016/cellular_modems_33c3/33c3-modems.html
h2. Information sources
All information here is based on publicly found documents on the internet as well as studying the source code released by Qualcomm, Quectel and others as well as bits of reverse engineering on the devices themselves. We commit to _legal_ forms of reverse engineering, such as running software in emulators, using tracing and debugging facilities.