• Ah, looks like it's like this on the RAK5010

    # Use this for the 8mb external flash if chip is installed in board
    #    'address' : 0x60000000, # put this in external spiflash (see below)
    #    'page_size' : 4096,
    #    'pages' : 2048, # Entire 8MB of external flash
    #    'flash_available' : 512 - ((31 + 8 + 2)*4) # Softdevice uses 31 pages of flash, bootloader 8, FS 2. Each page is 4 kb.
      },
    };
    
    devices = {
      'LED1' : { 'pin' : 'D12' },
      # IS25WP064A QSPI flash
    #  'SPIFLASH' : { # Chip is not installed in board
    #            'pin_cs' : 'D42',  #  cs    P1.10
    #            'pin_sck' : 'D43', #  clk   P1.11
    #            'pin_mosi' : 'D3', #  d0    P0.03
    #            'pin_miso' : 'D47', #  d1    P1.15
    #            'pin_wp' : 'D46', #  d2    P1.14 
    #            'pin_rst' : 'D45', #  d3    P1.13
    #            'size' : 8192*1024, # 8MB
    #            'memmap_base' : 0x60000000 # map into the address space (in software)
    #          }
    };
    

    which I expect the commented out lines would relocate the storage to external flash

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