Problem with Zip file

You can get the address of the flash memory from SOPC builder, and the offset is something you can fix in the flash programmer when you add the zip file.

But I just saw you mentioned epcs_flash_controller. I wasn't sure serial flash memories were supported in rozipfs (the documentation doesn't say which type of flash is supported) so I had a quick look at the source code. From what I see only parallel flash chips are supported, as this filesystem requires a direct memory map access to the contents. If you want to use it with an EPCS you will need to modify it, especially the read_word, read_word_inc, read_half_word, and read_half_word_inc functions. I think someone else on the forum did this but I don't remember if the modified source code was ever published.