[yocto] lib source code change

[Peter Balazovic]

I ahve built an imamge and SDK where opencv is part of that. Now I do need
to change this lib.Instead of rebuilding all I am trying to change just the
library.

How should I deploy that change to reflecte the eSDK (cross toolchain) and
modify (update) target image.

I wonder if "devtool modify" can be use and how for this?
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