I'm using blackfin533, and I would like to write a software for flash memory testing. How would I test the flash memory ? I know how to test an eeprom but how would I test the flash memory of the blackfin533?
Normally applications do not test flash memory as normal flash memory has a limited number of guaranteed write cycles.
The normal practice, if data validation is necessary, is to write a set of data followed by a check sum. The specific type of check sum does not matter as long as it satisfies your requirements. They all should be able to tell if a single bit has unexpectedly changed. More complex check sums can also correct for these unexpected changes.
I see from the comments the intent is to use an Analog.com's Blackfin processor to access external flash memory. Perhaps this document will help you develop the code to manage this type of memory.