It is a FAT32 partition which has the .efi files for booting, which you can create using gparted or gdisk. (Size at least 200-300 MiB.) Ensure the flags `boot` and `esp` are set on this partition.
它是一个 FAT32 分区，里边包含用于启动的 .efi 文件，您可以通过 gparted 或者 gdisk 来创建它 (大小为 200-300 MiB)，并且要确保给分区设置 `boot` 和 `esp` 标记。