URL:
<http://savannah.gnu.org/bugs/?23615>
Summary: EFI memory map size
Project: GNU GRUB
Submitted by: gwythaint
Submitted on: Tuesday 06/17/2008 at 08:57
Category: Booting
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: kern/efi/mm.c version 1.4
Reproducibility: Every Time
Planned Release:
_______________________________________________________
Details:
grub_efi_get_memory_map() has two failure modes and one,
GRUB_EFI_BUFFER_TOO_SMALL is not handled gracefully.
The the problem occurs if a native EFI firmware requires more than
MEMORY_MAP_SIZE; 4096 bytes in this case.
By happenstance, the problem is mis-reported as "too little memory" when in
fact, the memory map itself is not processor properly.
It probably takes a seriously large server board such as the Intel NSW1U
Network Server to report such a large memory map table.
As an example, the NSW1U, American Megatrends bios version
S5000.86B.10.00.0085 requires 7872 bytes.
The following is a workaround for this class of symptom and a differential
diagnostic message for the errors possible from grub_efi_get_memory_map().
Index: mm.c
===================================================================
RCS file: /sources/grub/grub2/kern/efi/mm.c,v
retrieving revision 1.4
diff -r1.4 mm.c
33c33
< #define MEMORY_MAP_SIZE 0x1000
---
> #define MEMORY_MAP_SIZE 0x2000
346a347
> int efi_status;
367c368,373
< if (grub_efi_get_memory_map (&map_size, memory_map, 0, &desc_size, 0) <
0)
---
> efi_status = grub_efi_get_memory_map (&map_size, memory_map, 0,
&desc_size, 0);
>
> if (efi_status == 0)
> grub_fatal ("buffer too small: need %d bytes", map_size);
>
> if (efi_status == -1)
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/bugs/?23615>
_______________________________________________
Message sent via/by Savannah
http://savannah.gnu.org/
_______________________________________________
Bug-grub mailing list
[email protected]
http://lists.gnu.org/mailman/listinfo/bug-grub
