When using SPIM/SPI configuration with some hardware designs, the pins.io2 and pins.io3 fields can serve additional purposes beyond data lines.
These pins can be connected to the external flash's write protect and reset pins, which are typically active low.
When pins.io2 and pins.io3 are specified in the configuration, the pins connected to them will be pulled high during programming operations to ensure write protection and reset do not activate.
If you have a designs that uses these connections, make sure to properly configure the pins.io2 and pins.io3 pins to ensure correct external flash operation during programming.
If these pins are not used in your design, you can indicate that they are disabled by setting them to 4294967295 (which corresponds to 0xFFFFFFFF).