To generate the merged .mcs file, use the Deployment tool (Lattice Diamond 2.2 onwards).
Follow the process mentioned below:
1. Open the Deployment Tool from Start Menu> All Programs> Lattice Diamond version > Accessories> Deployment Tool. Or Start Menu > All Programs > Lattice Diamond Programmer version > Deployment Tool.
2. In the Diamond Deployment Tool - Getting Started window, create a New Deployment file and select Function Type as "External Memory" and Output File Type as "Advance SPI Flash".
3. Under the File name, browse to the input bit file (The iCE40 device name under Device Family will pop up automatically). Click Next.
4. Select your Flash. Enable the cold boot option, and select multiple files. Click Next and then click on Generate to get the merged .mcs file.
5. Click on Launch Debugger icon to view the file.