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No, you don't need a 'very bespoke AOSP' to turn your phone into a Rabbit R1 — here's proof
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
Every device had it's own device tree and kernel with custom driver's, binary blinds, and system software. All of it runs beside the closed source modern os
I’m not entirely sure because I’m not very knowledgeable about CPUs, but it seems this is largely a problem with ARM architectures and their lack of standardization, isn’t it?
There's nothing like uefi between the os and the hardware