A.2. Flash Override Files
To support newly released flash memory devices which might have problems in the CFI table, the Nios® II Flash Programmer provides the ability to override CFI table entries with flash override files. A flash override file lets you manually override erroneous information in the CFI table, which enables the Nios® II Flash Programmer to function correctly.
Before creating an override file, run quartus_pgm --nios2 from the command line with the --debug parameter, which lists the CFI table found in the device. Compare the debug output with the device's data sheet.