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AM437x boot signed image

Hello all.

We need to boot the signed u-boot image.

The initial ROM loader is checking whether the key is correct and continue loading of the image (looking at flow chart in technical reference man).

All I found is signGP util (and don't know if it's really what I need).

So I need to know what docs I need and is there availabe tools at all do do what I need.

Thanks.