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After a lot of work Ive managed to get near-mainline kernel and #postmarketos (now #nura but my image built before the change) booting on kindle paperwhite3 without opening it up and accessing the serial port. The installation is a bit convoluted but doable. Current have WiFi/screen/touchscreen/backlight all working, and issue with usb right now.
I've nearly finished packaged it up to be submitted as an MR even with the slightly convoluted installation