This blogpost propagates what I'd like to describe as an urban legend about baseband processors and main memory. The story originates from old times where even fancy phones allowed the baseband to write everywhere in main memory. The myth then becomes that you need the baseband physically separated from your main application processor.
But the world's moved on since those reports were made. It's FUD: https://www.reddit.com/r/CopperheadOS/comments/6wtul0/on_sen...