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Re: grub EFI "too little memory"

From: Andrei E. Warkentin
Subject: Re: grub EFI "too little memory"
Date: Tue, 17 Jun 2008 08:26:56 -0500

Straight from the public UEFI  docs:

If the MemoryMap buffer is too small, the EFI_BUFFER_TOO_SMALL error code is returned and 
the MemoryMapSize value contains the size of the buffer needed to contain the current 
memory map. The actual size of the buffer allocated for the consequent call to GetMemoryMap() 
should be bigger then the value returned in MemoryMapSize, since allocation of the new buffer 
may potentially increase memory map size. 

...and of course you can use BootServices->AllocatePool to grab the desired amount...

17.06.2008, в 3:58, David Holloway написал(а):

David Holloway wrote:
Intended for Robert Millan, et. al.

I have an Intel 1U server board that fails with the current version of grub with the message "too little memory", as in line 312 of CVS version 1.4 of grub2/kern/efi/mm.c
The board is described here:

I added some debug and I think "required_pages" at line 312 has a value of 1MB (256 pages), consistent with MIN_HEAP.
mmap from the EFI shell reports just 38 pages of LoaderData and just 196 pages of LoaderCode.

It's my intention to bone up on EFI, but I'm not there yet.

The question: does just 38 pages of LoaderData make sense in this implemetation? is MIN_HEAP too large or does this EFI implementation provide too little memory to be practical?

I diagnosed the root problem.
The NSW1U board requires 7872 bytes for its memory map during the EFI GetMemoryMap call, but only 4096 are supplied.

Obviously my short term solution is to increase MEMORY_MAP_SIZE from 0x1000 to 0x2000, but one wonders what the robust solution should be instead.  In fact, I now have the NSW1U server board working after this change.

I'm now filing a bug report on the matter.

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