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iMPACT - Checksum read from SPI Flash does not match value in the .prm file
When I read the checksum in iMPACT from an SPI Flash, it does not match the value listed in the .prm file.
Why is this?
iMPACT uses a different algorithm for SPI Checksum calculation.
iMPACT will byte swap data before carrying out the byte addition.
PROM Generator does not do this.
iMPACT will consistently read the checksum, so a "Golden" version of the Checksum from a known good programming attempt can be used to compare iMPACT programming attempts.
Where programming is carried out by a non-Xilinx tool, the Checksum generated by the PROM Generator in the .prm file will be a better fit for comparison.
See (Xilinx Answer 18884) for details on how PROM Generator calculates a checksum and considerations when matching this checksum to one read from a device.
This issues is resolved in the Vivado Device Programmer 2014.3/2014.4.
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