Storing user data in EPCS64

Configuration data is stored at the lower epcs addresses. The higher address depends from the configuration data itself and you can retrieve from the .sof file.

If you don't need to change the user data (I mean you only need to write it and never erasing) you can write directly from the first epcs free address. If you need to change user data, you must start at the beginning of next epcs block, otherwise you are erasing the last part of configuration data, too.