11-23-2020, 07:06 AM
(11-23-2020, 12:39 AM)JuniperFury Wrote:There's a separation between Qualcomm's blob that does the radio side and Quectel's part that does management and looks after interfaces. All the reverse engineering I'm aware of has been directed at Quectel's part.(11-15-2020, 11:07 AM)LinAdmin2 Wrote: There are reverse engineering efforts for Qualcomm and Quectel modems underway.
We will see how far they advance...
Can you point me in the direction of these efforts?
https://forum.pine64.org/showthread.php?tid=11797
https://xnux.eu/devices/feature/modem-pp-reveng.html
https://projects.osmocom.org/projects/qu.../wiki/EC25
I don't know whether libqmi is based on public documentation or reverse engineering of the interface for talking to Qualcomm's blob.
(11-23-2020, 12:39 AM)JuniperFury Wrote: I've been off the internet for quite some time. Can anyone recommend good courses or moocs that would help me dive in to everything I need to develop the PinePhone as well? Courses without much theory or history that would allow me to start working and customising the device for different scenarios would be great. I am guessing I need basics of electrical engineering because those schematics looked like extraterrestrial hieroglyphics ^_^. GSM Stack and I guess C++ for the linux os?That's a big one - what level are you starting from? Any electronics or programming experience at all? Are you looking for general understanding, or do you have a specific goal in mind?
The GSM side is abstracted by oFono or ModemManager depending on which front end you're using. You communicate with these via dbus, and they translate to/from the AT, QMI or whatever else the modem hardware uses.