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How do you make a .img file from a rootfs?

Moderators: chensy, FATechsupport

NanoPi-fuser-win32 requires a .img file. Could you explain how to generate a .img file from a rootfs or rootfs.tgz file?

I how found a utility called make_ext4fs but an usage example would be helpful, say for a 8G microSD card.

Thank you,
More searching ... and I think running the mkimage.sh file in the sd-fuse_nanopi folder, after you apt-get install kpartx is the solution.

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