[charcircuit]

In the article they describe how they are running the proprietary memory training software on the M4 core in the i.MX 8 chip.

Running proprietary code on the i.MX 8 chip means that it is not 100% running on free software.

[fsflover]

I'm no expert but probably yes. More details: https://source.puri.sm/Librem5/community-wiki/-/wikis/Freque...

It's however the most free phone as far as I know.