linux-kernel - Re: Linux detects only 2.6GiB RAM in legacy boot

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Message-ID: <CAFLxGvzsb2C+qBXjCtSQcGYT6TGnRR8LuvsCAdcGvru7CvKkdA@mail.gmail.com>
Date:	Sun, 20 Jan 2013 00:14:15 +0100
From:	richard -rw- weinberger <richard.weinberger@...il.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Linux detects only 2.6GiB RAM in legacy boot

On Sat, Jan 19, 2013 at 11:04 PM, Yinghai Lu <yinghai@...nel.org> wrote:
>> Is there anything I can do or is this a plain UEFI/BIOS bug?
>
> looks like BIOS problem:
>
> UEFI one:
> [    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000008ffff] usable
> [    0.000000] BIOS-e820: [mem 0x0000000000090000-0x00000000000bffff] reserved
> [    0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000001fffffff] usable
> [    0.000000] BIOS-e820: [mem 0x0000000020000000-0x00000000201fffff] reserved
> [    0.000000] BIOS-e820: [mem 0x0000000020200000-0x0000000040003fff] usable
> [    0.000000] BIOS-e820: [mem 0x0000000040004000-0x0000000040004fff] reserved
> [    0.000000] BIOS-e820: [mem 0x0000000040005000-0x000000008f465fff] usable
> [    0.000000] BIOS-e820: [mem 0x000000008f466000-0x000000008f667fff] reserved
> [    0.000000] BIOS-e820: [mem 0x000000008f668000-0x00000000d829efff] usable
> [    0.000000] BIOS-e820: [mem 0x00000000d829f000-0x00000000dae9efff] reserved
> [    0.000000] BIOS-e820: [mem 0x00000000dae9f000-0x00000000daf9efff] ACPI NVS
> [    0.000000] BIOS-e820: [mem 0x00000000daf9f000-0x00000000daffefff] ACPI data
> [    0.000000] BIOS-e820: [mem 0x00000000dafff000-0x00000000daffffff] usable
> [    0.000000] BIOS-e820: [mem 0x00000000db000000-0x00000000df9fffff] reserved
> [    0.000000] BIOS-e820: [mem 0x00000000f80f8000-0x00000000f80f8fff] reserved
> [    0.000000] BIOS-e820: [mem 0x00000000fed1c000-0x00000000fed1ffff] reserved
> [    0.000000] BIOS-e820: [mem 0x0000000100000000-0x000000011e5fffff] usable
>
> legacy one:
>
> [    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009d7ff] usable
> [    0.000000] BIOS-e820: [mem 0x000000000009d800-0x000000000009ffff] reserved
> [    0.000000] BIOS-e820: [mem 0x00000000000e0000-0x00000000000fffff] reserved
> [    0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000001fffffff] usable
> [    0.000000] BIOS-e820: [mem 0x0000000020000000-0x00000000201fffff] reserved
> [    0.000000] BIOS-e820: [mem 0x0000000020200000-0x0000000040003fff] usable
> [    0.000000] BIOS-e820: [mem 0x0000000040004000-0x0000000040004fff] reserved
> [    0.000000] BIOS-e820: [mem 0x0000000040005000-0x000000008cfaafff] usable
> [    0.000000] BIOS-e820: [mem 0x000000008cfab000-0x00000000dae9efff] reserved
> [    0.000000] BIOS-e820: [mem 0x00000000dae9f000-0x00000000daf9efff] ACPI NVS
> [    0.000000] BIOS-e820: [mem 0x00000000daf9f000-0x00000000daffefff] ACPI data
> [    0.000000] BIOS-e820: [mem 0x00000000dafff000-0x00000000df9fffff] reserved
> [    0.000000] BIOS-e820: [mem 0x00000000f8000000-0x00000000fbffffff] reserved
> [    0.000000] BIOS-e820: [mem 0x00000000fec00000-0x00000000fec00fff] reserved
> [    0.000000] BIOS-e820: [mem 0x00000000fed08000-0x00000000fed08fff] reserved
> [    0.000000] BIOS-e820: [mem 0x00000000fed10000-0x00000000fed19fff] reserved
> [    0.000000] BIOS-e820: [mem 0x00000000fed1c000-0x00000000fed1ffff] reserved
> [    0.000000] BIOS-e820: [mem 0x00000000fee00000-0x00000000fee00fff] reserved
> [    0.000000] BIOS-e820: [mem 0x00000000ffc00000-0x00000000ffffffff] reserved
> [    0.000000] BIOS-e820: [mem 0x0000000100000000-0x000000011e5fffff] usable
>
> So difference:
>
> [    0.000000] BIOS-e820: [mem 0x000000008f466000-0x000000008f667fff] reserved
> [    0.000000] BIOS-e820: [mem 0x000000008f668000-0x00000000d829efff] usable
> [    0.000000] BIOS-e820: [mem 0x00000000d829f000-0x00000000dae9efff] reserved
>
> to
>
> [    0.000000] BIOS-e820: [mem 0x000000008cfab000-0x00000000dae9efff] reserved
>
> at least about 1G get lost in e820.

BTW: My BIOS is already the latest version.

> Can you please apply attached patch to see the raw e820?

See attachment. :-)

-- 
Thanks,
//richard

View attachment "dmesg_legacy.txt" of type "text/plain" (57677 bytes)