Public bug reported:
Create a EFI SYSTEM PARTITION of minimum 100 MiB size (200 MiB
recomended). Also partman-efi should use FAT32 instead of FAT16 for EFI
SYSTEM PARTITION as mandated by the UEFI 2.3.1 Spec. FAT16 ESP partition
is not recognised by Windows 7 UEFI bootloader because of this.
The below quote is copied form the UEFI Specification 2.3.1 - Chapter
12.3 File System Format.
[QUOTE]
EFI encompasses the use of FAT32 for a system partition, and FAT12 or FAT16 for
removable media. The FAT32 system partition is identified by an OSType value
other than that used to identify previous versions of FAT. This unique
partition type distinguishes an EFI defined file system from a normal FAT file
system. The file system supported by EFI includes support for long file names.
FAT defines that all files in a directory must have a unique name, and
unique is defined as a case insensitive match.
UEFI does not impose a restriction on the number or location of System
Partitions that can exist on a system. System Partitions are discovered when
required by UEFI firmware by examining the partition GUID and verifying that
the contents of the partition conform to the FAT file system as defined in
Section 12.3.1.1. Further, UEFI implementations may allow the use of conforming
FAT partitions which do not use the ESP GUID. Partition creators may prevent
UEFI firmware from examining and using a specific partition by setting bit 1 of
the Partition Attributes (see 5.3.3) which will exclude the partition as a
potential ESP.
[/QUOTE]
** Affects: partman-efi (Ubuntu)
Importance: Undecided
Status: New
** Tags: efi efisys esp fat fat16 fat32 uefi
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https://bugs.launchpad.net/bugs/811485
Title:
EFI SYSTEM PARTITION should be atleast 100 MiB size and formatted as
FAT32, not FAT16
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