disko/example/gpt-bios-compat.nix

# Example to create a bios compatible gpt partition
{ disks ? [ "/dev/vdb" ], ... }: {
  disko.devices = {
    disk = {
      vdb = {
        device = builtins.elemAt disks 0;
        type = "disk";
        content = {
          type = "table";
          format = "gpt";
          partitions = [
            {
              name = "boot";
              start = "0";
              end = "1M";
              part-type = "primary";
              flags = [ "bios_grub" ];
            }
            {
              name = "root";
              # leave space for the grub aka BIOS boot
              start = "1M";
              end = "100%";
              part-type = "primary";
              bootable = true;
              content = {
                type = "filesystem";
                format = "ext4";
                mountpoint = "/";
              };
            }
          ];
        };
      };
    };
  };
}