The communication with the external memory must be configured before performing a write, read, and verify operations. The top bar "Setup -> Memory Configuration" shows the memory configuration window. In this window, you can configure the connection with memories supported by the device. The result of the configuration is the values of configuration words used in the "configure-memory" command.
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Configuration involves selecting the type and parameters of the external memory.
At first, you need to select one of the available types: Nor, SD or Nand. Then you can select one of the pre-configured "Boot Device" options.
Alternatively, you can make your own settings.