(04-25-2021, 04:11 AM)amosbatto Wrote:(04-21-2021, 05:25 PM)megous Wrote: Actually Linux is GPL, so there are no legal reasons not to run it on the ARM SoC part of the modem. It would be against the contract to prevent users from modifying it and running it as they want.
I assume that the FCC won't allow a phone to be sold with free firmware in the cellular modem, since people can modify it to use unauthorized bands. I haven't investigated whether that is possible with the free firmware for the EG25-G, but that is probably what gamerminstral is talking about.
The part that the certification bodies are interested in, or at least should be interested in, is the DSP part of the modem. This closed-source part is responsible for the wireless communication coming in and out of the modem. The part that runs on the ARM SoC inside the modem is pretty much a bridge to the phone, and cannot do much with the wireless signal that gets out of the modem, such as make the modem use unauthorized bands.