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Best way to compute firmware checksum?

I need to compute the checksum for a firmware image and I'm looking for suggestions on what works best.

I'm using SES and I don't see any checksum or CRC of the firmware image displayed after building the project.

I found that the SEGGER J-Flash software will compute a CRC of the data, but it seems to be broken as I can't

make it compute only the application flash region, even after deselecting the UICR region. But this is a separate

issue. I'd like to know what methods people generally use to compute a checksum.

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