Forum Discussion

amildm's avatar
amildm
Icon for Contributor rankContributor
4 years ago
Solved

seed -> how to get same SOF for each compilation run?

Hi All, Each time when I compile the design, I'm getting the different SOF files even I don't change anything neither in my Design nor in QSF... the resulting SOF will be different... Sho...
  • ak6dn's avatar
    ak6dn
    4 years ago

    The source files drive the logic generation / mapping phases.

    So if you compile with the exact same sources, the logic produced will be exactly the same.

    The SEED value only drives the fitter.

    Different SEED values will produce different placements of the exact same logic.

    So if you don't change the source files, the logic will be the same.

    If you don't change the seed, the placement will be the same.

ShengN_altera's avatar
ShengN_altera
Icon for Super Contributor rankSuper Contributor
4 years ago

Hi,


I generated two sof files from same design then convert them to two hex files and compare side by side using diff tool.

Different seed: There are much differences between both the files up to thousand changes.

Same global seed: There are totally no differences between both the files with zero changes.

So should be the same for jic files and no problem if you stick with same global seed. I don't think you can check the timestamp of JIC file. Thank you.


Best Regards,

Sheng

p/s: If any answer from community or Intel support are helpful, please feel free to mark as solution and give Kudos.