From: Roland Dreier <rolandd@cisco.com>
To: Marcel Holtmann <marcel@holtmann.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 4GB memory and Intel Dual-Core system
Date: Thu, 27 Oct 2005 13:54:37 -0700 [thread overview]
Message-ID: <52ek66wuia.fsf@cisco.com> (raw)
In-Reply-To: <1130446278.5416.10.camel@blade> (Marcel Holtmann's message of "Thu, 27 Oct 2005 22:51:18 +0200")
> BIOS-provided physical RAM map:
> BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
> BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
> BIOS-e820: 00000000000edbb0 - 0000000000100000 (reserved)
> BIOS-e820: 0000000000100000 - 00000000cec11000 (usable)
> BIOS-e820: 00000000cec11000 - 00000000cee12000 (ACPI NVS)
> BIOS-e820: 00000000cee12000 - 00000000cf68f000 (usable)
> BIOS-e820: 00000000cf68f000 - 00000000cf6e9000 (ACPI NVS)
> BIOS-e820: 00000000cf6e9000 - 00000000cf6ed000 (usable)
> BIOS-e820: 00000000cf6ed000 - 00000000cf6ff000 (ACPI data)
> BIOS-e820: 00000000cf6ff000 - 00000000cf700000 (usable)
If that's the full e820 map, then I guess the question is why did the
BIOS not tell you about any memory above 0xcf700000?
And I have no idea why it wouldn't. For comparison, here's an AMD64
system I have with 4 GB of RAM. Notice how it put a big chunk of RAM
above 4G:
BIOS-e820: 0000000000000000 - 0000000000098800 (usable)
BIOS-e820: 0000000000098800 - 00000000000a0000 (reserved)
BIOS-e820: 00000000000c2000 - 0000000000100000 (reserved)
BIOS-e820: 0000000000100000 - 00000000bff20000 (usable)
BIOS-e820: 00000000bff20000 - 00000000bff2a000 (ACPI data)
BIOS-e820: 00000000bff2a000 - 00000000bff80000 (ACPI NVS)
BIOS-e820: 00000000bff80000 - 00000000c0000000 (reserved)
BIOS-e820: 00000000d8800000 - 00000000d8800400 (reserved)
BIOS-e820: 00000000d8801000 - 00000000d8801400 (reserved)
BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
BIOS-e820: 00000000fec00000 - 00000000fec00400 (reserved)
BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
BIOS-e820: 00000000fff80000 - 0000000100000000 (reserved)
BIOS-e820: 0000000100000000 - 0000000140000000 (usable)
- R.
next prev parent reply other threads:[~2005-10-27 20:54 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-27 20:33 4GB memory and Intel Dual-Core system Marcel Holtmann
2005-10-27 20:44 ` Roland Dreier
2005-10-27 20:51 ` Marcel Holtmann
2005-10-27 20:54 ` Roland Dreier [this message]
2005-10-27 21:00 ` Marcel Holtmann
2005-10-27 21:06 ` Roland Dreier
2005-10-27 21:08 ` Marcel Holtmann
2005-10-27 21:10 ` Alejandro Bonilla
2005-10-27 20:57 ` Alejandro Bonilla
2005-10-27 20:54 ` Alejandro Bonilla
2005-10-27 20:57 ` Marcel Holtmann
2005-10-27 21:02 ` Alejandro Bonilla
2005-10-27 21:07 ` Marcel Holtmann
2005-10-27 21:15 ` Alejandro Bonilla
2005-10-27 21:19 ` Marcel Holtmann
2005-10-27 22:26 ` Joe Bob Spamtest
2005-10-27 22:05 ` Dave Jones
2005-10-27 22:09 ` Vladimir Lazarenko
2005-11-02 16:21 ` Lennart Sorensen
2005-10-27 22:11 ` Marcel Holtmann
2005-10-27 22:12 ` Dave Jones
2005-10-27 22:17 ` Marcel Holtmann
2005-10-27 22:20 ` Alejandro Bonilla
2005-10-28 0:33 ` Bernd Eckenfels
2005-10-30 22:26 ` Alan Cox
2005-10-31 3:39 ` Alejandro Bonilla Beeche
2005-10-31 13:02 ` Alan Cox
2005-10-31 23:03 ` Martin J. Bligh
2005-11-01 5:03 ` thockin
2005-10-27 22:29 ` Joel Jaeggli
2005-10-27 22:13 ` Alejandro Bonilla
2005-10-27 22:18 ` Marcel Holtmann
2005-10-28 2:35 ` Fawad Lateef
2005-10-28 3:09 ` Joel Jaeggli
2005-10-28 7:19 ` Fawad Lateef
2005-10-28 15:56 ` Joe Bob Spamtest
2005-10-28 15:29 ` Eric W. Biederman
2005-10-28 15:45 ` Alejandro Bonilla
2005-10-28 16:09 ` Eric W. Biederman
2005-10-30 22:24 ` Alan Cox
2005-11-02 16:20 ` Lennart Sorensen
2005-10-27 22:12 ` Andi Kleen
2005-10-27 21:09 ` linux-os (Dick Johnson)
2005-10-27 21:32 ` Bernd Eckenfels
-- strict thread matches above, loose matches on Subject: below --
2005-10-28 20:58 Lukas Hejtmanek
2005-10-29 3:32 ` Dave Jones
2005-10-29 11:15 ` Marcel Holtmann
2005-10-30 6:49 ` Dave Jones
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