Have you been able to get this to work on the pine64?
I have been unable to get older methods to work to transfer the rootFS from the SD card to the USB. There have been some changes in how DietPi seems to reading the sd card and I am not linux savvy enough to be able to figure it out on my own.
This used to work on with my pine64, however I am unable to get it to work now.
I can tell that the rock64 uses a bit of a file system compared to the pine64 from what I’ve read here and else where but a lot of it is globl-d-gook to me. Any help would be great.