How does sysupgrade bin generate?

why the data layout of the binary will diff every time after building?
many different blocks when diff?

files are date stamped, on file level, and sometimes internally, every time you build a new binary,
the date will get updated, it's enough for the image to differ.

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Most timestamps are static based on the timestamp of the last git commit, but there may be packages that do not follow the practice and e.g. include the build time into the package binaries.

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