Using Storage with the W25 flash chips

So in this case,

  'SPIFLASH' : {
            'pin_cs' : 'D21',
            'pin_sck' : 'D19',
            'pin_mosi' : 'D27', # D0
            'pin_miso' : 'D20', # D1
            'pin_wp' : 'D31', # D2
            'pin_rst' : 'D17', # D3
            'size' : 4096*1024, # 4MB
            'memmap_base' : 0x60000000 # map into the address space (in software)
          }

if I add something like that in a custom board file, is there anything else i need to do so I can have the same layout as you mentioned: Storage in internal flash and then SPI accessible via Flash API ? Or I just need to add that board definition and that's it?