[bug #34840] grub 1.99 fails to detect FAT filesystem on EFI Partition

[Mildred]

URL:
  <http://savannah.gnu.org/bugs/?34840>

                 Summary: grub 1.99 fails to detect FAT filesystem on EFI
Partition
                 Project: GNU GRUB
            Submitted by: mildred
            Submitted on: Wed 16 Nov 2011 01:32:05 PM GMT
                Category: Filesystem
                Severity: Major
                Priority: 5 - Normal
              Item Group: Software Error
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 
                 Release: other
         Reproducibility: None
         Planned Release: None

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Details:

I have a system which has an EFI partition, formatted as FAT. But GRUB doesn't
recognize it is a FAT filesystem. Consequently, GRUB don't find its
configuration file and defaults to the command line.

I set debug=all and all I could find that was of interest was:

grub> ls (hd1,gpt1)
...
kern/disk.c:245: Opening `hd1,gpt1'
disk/efi/efidisk.c:508: opening hd1
disk/efi/efidisk.c:538: m = 0x7de9c448, last block = df94daf, block size =
200
disk/efi/efidisk.c:543: opening hd1 succeeded
disk/efi/efidisk.c:571: reading 0x8 sectors at the sector 0x0 from hd1
partmap/gpt.c:86: Read a valid GPT header
partmap/gpt.c:110: GPT entry 0: start=40, length=409600
kern/fs.c:54: Detecting ext2...
disk/efi/efidisk.c:571: reading 0x8 sectors at the sector 0x28 from hd1
kern/fs.c:60: ext2 detection failed.
kern/fs.c:54: Detecting fat...
kern/fs.c:60: fat detection failed.
kern/disk.c:330: Closing `hd1'.
disk/efi/efidisk.c:552: closing hd1
error: unknown filesystem
...

(hd0) is the USB key, and (hd0,msdos1) is FAT, and GRUB detect it correctly.




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