bugGNU GRUB - Bugs: bug #22751, GRUB1.96 fails to recognize more...

 
 

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

Submitter:  Pierre Baillet <octplane>
Submitted:  Thu 27 Mar 2008 11:31:04 AM UTC
   
 
Category:  Booting Severity:  Major
Priority:  5 - Normal Item Group:  Software Error
Status:  Fixed Privacy:  Public
Assigned to:  None Originator Name: 
Open/Closed:  Closed Release:  1.98
Release:  1.96 Reproducibility:  Every Time
Planned Release:  None

Fri 21 May 2010 09:12:08 PM UTC, comment #2: 

Author failed to answer Felix' retest request. Additionaly grub 1.98 doesn't seem to exhibit such a bug when tested in qemu

Vladimir Serbinenko <phcoder>
Group administrator
Fri 22 Aug 2008 07:28:40 PM UTC, comment #1: 

the 1.96 release is a bit old, can you (or someone else of course) please try this with current SVN ?
Maybe this has been already fixed in GRUB or something on Xen changed in the meanwhile so it's not needed anymore.

Felix Zielcke <fzielcke>
Group Member
Thu 27 Mar 2008 11:31:04 AM UTC, original submission:  

Hi,

This bugs seems to exists in grub legacy but a patch exists (http://lists.xensource.com/archives/html/xen-users/2007-08/msg00028.html) 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.
--
Pierre.

Pierre Baillet <octplane>

 

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    Follow 3 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2010-05-21 phcoder StatusNone Fixed
        Open/ClosedOpen Closed
        ReleaseNone 1.98

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