[krallja]

How about the two cited references?

> Damien Cauquil held a presentation at HITB Amsterdam in 2019 that went into detail about how this process works on I.MX based processors. Lucky for us, he released a tool that removes the OOB data. It produces a binary file similar to what U-Boot or Linux would see when interacting with the NAND flash.

[zbrozek]

I did check that out, but it's a bit narrower and deeper than I'm ready for. But maybe that's sort of the point - there's not a great general-purpose way to examine device flash memories.