Basic Usage: FAT32 format a 4GB to 1TB memory card. Place an ISO file on the memory card called boot.iso and insert the memory card. Use a program such as GUIFormat to format large Fat32 memory cards. http://www.ridgecrop.demon.co.uk/index.htm?guiformat.htm If you would like to take advantage of a full menu, Swiss is needed. Simply place Swiss on the memory card called boot.iso. Drag your other homebrew and backups to memory and insert it in the GC Loader. Swiss will automatically boot and you will have access to your library.
The Latest version of Swiss r743 supports the GCLoader and can be downloaded from the github. https://github.com/emukidid/swiss-gc/releases Make sure to you choose the correct region for your gamecube.
Write support to the GCLoader is not 100% working. This means to use features in Swiss, such as force resolution a separate SD card device is needed, such as an SDGecko or SD2SP2 to store these settings. Write support will be added very soon to the GCLoader so these extra devices will not be needed in the future.