Thank you, I'm glad you like!

not having worked with memmap before, it is not immediately obvious to me which hex means what (I am guessing RANGE@START? ). Would be nice to have a link to an explanation there.

I just have the link to the kernel docs because I think they do a better job explaining it than I would 😁

But yeah, basically. Except for this use-case you want RANGE$START not @. And you can use human sizes like 128M$RANGE.