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[bug #22751] GRUB1.96 fails to recognize more than 4GB of memory

From: Pierre Baillet
Subject: [bug #22751] GRUB1.96 fails to recognize more than 4GB of memory
Date: Thu, 27 Mar 2008 11:31:05 +0000
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; fr; rv: Gecko/20080311 Firefox/


                 Summary: GRUB1.96 fails to recognize more than 4GB of memory
                 Project: GNU GRUB
            Submitted by: octplane
            Submitted on: jeudi 27.03.2008 à 11:31
                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: 1.96
         Reproducibility: Every Time
         Planned Release: 




This bugs seems to exists in grub legacy but a patch exists
which cannot simply be applied to grub-2. 

In grub-2 however, the amount of memory detected is limited to the first 4GB
of memory. On a machine having 16GB the kernel reports an  incorrect figure. 

>From the documentation found on the internet this issue arises when using
kernel that does not recompute the amount of memory themselves and trust the
bootloader to give exact figures. 

This is the case when using Xen-3.0.3 and grub-1.96 on debian stable. In my
case, I need 1.96 because of a fully LVMed disk.

(XEN) Command line: (racine-os)/boot/xen-3.0.3-1-i386-pae.gz dom0_mem=256M
(XEN) Physical RAM map:
(XEN)  0000000000000000 - 000000000009f000 (usable)
(XEN)  0000000000100000 - 00000000bfb50000 (usable)
(XEN) System RAM: 3066MB (3140540kB)
(XEN) Xen heap: 10MB (10316kB)
(XEN) PAE enabled, limit: 16 GB

This is on x86 architecture.

I hope updating the patch is a matter of minutes to someone knowing the
internals of grub-2. I'm afraid it's not my case...

Thanks for providing GRUB.


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