Re: [Xen-users] FIXED!!! amd64 system only seeing 3.5gb instead of4gb of memory

[Rafał Kupka <rkupka+Listy.Xen@xxxxxxxxxxxxx>]

On Tue, Jun 19, 2007 at 09:14:21AM +1000, James Harper wrote:
Hello,

> > I thought the same, but one grub stage2 file behaves differently on
> > two motherboards. It fails to detect[1] e820 memory map on my
> > computer, but copied to friend's one works perfectly. I think if
> > it's compiler bug[2] that copy shouldn't work on both computers.
> 
> What are the differences between the two motherboards?

affected: MSI K9N SLI Platinum, MSI K9N SLI-2F[1].
(nvidia MCP55 chipset, socket AM2)

not affected: Asus P5AD2E (chipset Intel 925XE),
old intel 440BX based Abit (don't know exact model)

So, they differ completely.

> How positive are you that it was actually installed correctly on your
> computer? Is the updated stage2 file definitely in /boot/grub?
I'm 100% sure.

> Does Linux itself definitely detect the e820 memory map correctly in
> both computers? Are you able to post the dmesg memory map under plain
> linux to the list?

Linux always detects memory correctly, only Grub/Xen has problems.

BIOS-provided physical RAM map:
 BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
 BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
 BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)
 BIOS-e820: 0000000000100000 - 00000000bffd0000 (usable)
 BIOS-e820: 00000000bffd0000 - 00000000bffde000 (ACPI data)
 BIOS-e820: 00000000bffde000 - 00000000c0000000 (ACPI NVS)
 BIOS-e820: 00000000d0000000 - 00000000e0000000 (reserved)
 BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved)
 BIOS-e820: 00000000fee00000 - 00000000fef00000 (reserved)
 BIOS-e820: 00000000ff780000 - 0000000100000000 (reserved)
 BIOS-e820: 0000000100000000 - 0000000140000000 (usable)

Kupson
[1] just model with less peripherals onboard
-- 
Great software without the knowledge to run it is pretty useless.
(Linux Gazette #1)

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