Bug#419994: Missing memory in Xen due to wrong detection of e820 memory map in grub
On Fri, Dec 07, 2007 at 12:18:21PM +0100, Markus Hochholdinger wrote: Hi, i had the same problem and found a bug report on https://bugzilla.redhat.com/show_bug.cgi?id=250299 . My solution for Debian 4.0, for others who hit this problem: Can you reproduce with GRUB 2? -- Robert Millan GPLv2 I know my rights; I want my phone call! DRM What use is a phone call, if you are unable to speak? (as seen on /.) -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Bug#419994: Missing memory in Xen due to wrong detection of e820 memory map in grub
Hi, i had the same problem and found a bug report on https://bugzilla.redhat.com/show_bug.cgi?id=250299 . My solution for Debian 4.0, for others who hit this problem: apt-get source grub apt-get build-dep grub cd grub-0.97/ cp -a stage2/common.c stage2/common.c.original vi stage2/common.c diff stage2/common.c.original stage2/common.c 145c145,146 unsigned long cont, memtmp, addr; --- unsigned long memtmp, addr; volatile unsigned long cont; debian/rules binary dpkg -i ../grub_0.97-27_i386.deb grub-install /dev/sda grub-install /dev/sdb After reboot all memory is seen by the xen hypervisor. -- greetings eMHa pgpvU11WHCHAG.pgp Description: PGP signature
Bug#419994: Missing memory in Xen due to wrong detection of e820 memory map in grub
On Thu, Apr 19, 2007 at 02:26:43PM +0200, Rafał Kupka wrote:
Dnia 19-04-2007, czw o godzinie 12:10 +0200, Rafal Kupka napisał:
Hello,
I think that problem is located in do { } while (cont) loop at file
stage2/common.c around line 181.
It looks like while loop is optimized away (gone) during compilation.
I was wrong, on another motherboard grub (same iso image) works
correctly. So, it's not missing code but something more machine/BIOS
specific. I'll try to get some more information.
Please, could you direct your debugging effort into grub2 ? grub legacy is
deprecated now, and I'm afraid you might be wasting your time since it's
probably going to be completely replaced soon.
Thanks
--
Robert Millan
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Bug#419994: Missing memory in Xen due to wrong detection of e820 memory map in grub
Package: grub
Version: 0.97-27
Severity: normal
Tags: patch
Hello,
On my system grub don't properly detect E820 memory map.
Without it Xen hypervisor cannot use memory above 4G range.
Output from grub command displaymem:
grub displaymem
EISA Memory BIOS Interface is present
Address Map BIOS Interface is present
Lower memory: 639K, Upper memory (to first chipset hole): 3406656K
grub
I think that problem is located in do { } while (cont) loop at file
stage2/common.c around line 181.
It looks like while loop is optimized away (gone) during compilation.
Don't know if it's bug in grub or toolchain and unfortunately I haven't
necessary knowledge to verify that.
Patch below fixes problem:
--- ../common.c 2007-04-19 11:36:19.0 +0200
+++ stage2/common.c 2007-04-19 11:36:55.0 +0200
@@ -142,7 +142,8 @@
init_bios_info (void)
{
#ifndef STAGE1_5
- unsigned long cont, memtmp, addr;
+ unsigned long memtmp, addr;
+ volatile unsigned long cont;
int drive;
#endif
displaymem after patch:
grub displaymem
EISA Memory BIOS Interface is present
Address Map BIOS Interface is present
Lower memory: 639K, Upper memory (to first chipset hole): 3406656K
[Address Range Descriptor entries immediately follow (values are 64-bit)]
Usable RAM: Base Address: 0x0 X 4GB + 0x0,
Length: 0x0 X 4GB + 0x9fc00 bytes
[ more ranges ] ...
Usable RAM: Base Address: 0x1 X 4GB + 0x0,
Length: 0x0 X 4GB + 0x3000 bytes
grub
Regards
Kupson
-- System Information:
Debian Release: 4.0
APT prefers stable
APT policy: (900, 'stable'), (700, 'unstable')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.20-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=pl_PL.UTF-8, LC_CTYPE=pl_PL.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
-- no debconf information
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Bug#419994: Missing memory in Xen due to wrong detection of e820 memory map in grub
Dnia 19-04-2007, czw o godzinie 12:10 +0200, Rafal Kupka napisał:
Hello,
I think that problem is located in do { } while (cont) loop at file
stage2/common.c around line 181.
It looks like while loop is optimized away (gone) during compilation.
I was wrong, on another motherboard grub (same iso image) works
correctly. So, it's not missing code but something more machine/BIOS
specific. I'll try to get some more information.
Kupson
