On 11/04/2022 22:29, Chris Murphy wrote:
UEFI Spec 2.8, 13.3.1.1 says "The EFI firmware must support the FAT32, FAT16, and FAT12 variants of the EFI file system. What variant of EFI FAT to use is defined by the size of the media. The rules defining the relationship between media size and FAT variants is defined in the specification for the EFI file system."
Also, ESP can use any FS that your firmware can read. I'm using ext4 on my desktop.
You can use efifs[1], packaged on Fedora[2].
[1]: https://github.com/pbatard/efifs [2]: https://src.fedoraproject.org/rpms/efifs