You can use the write_cfgmem Tcl command to generate .mcs images for a dual Quad SPI (x8) device. This command automatically splits the configuration data into two separate .mcs files.
Note: The size specified when generating the .mcs for SPIx8 is the total size of the two Quad Flash devices.
Note: The
write_cfgmem Tcl command divides the start address by 2 when building .mcs files for dual quad SPI (x8) mode.