Is Generic Serial Flash IP meant to work S25FL127S Flash in QUAD I/O mode?

Hi,

I just check that S25FL127S was not tested and not confirm to work from our end. The error might be due to the flash is not compatible with the FPGA. You may see the 3rd party configuration devices list for Cyclone V below:

https://www.intel.com/content/www/us/en/support/programmable/support-resources/design-guidance/configuration-support.html#intel-config-devices

Regards,

Aiman