From: clemens@dwf.com
To: Brian Gerst <bgerst@didntduck.org>
Cc: root@chaos.analogic.com, reg@dwf.com,
linux-kernel@vger.kernel.org, reg@orion.dwf.com,
linux@horizon.com, reg@orion.dwf.com
Subject: Re: Intel 875 Motherboard cant use 4GB of Memory.
Date: Wed, 02 Jun 2004 21:03:49 -0600 [thread overview]
Message-ID: <200406030303.i5333nof009223@orion.dwf.com> (raw)
In-Reply-To: Message from Brian Gerst <bgerst@didntduck.org> of "Wed, 02 Jun 2004 21:11:25 EDT." <40BE7ABD.1050609@quark.didntduck.org>
Wrong. Ever since the Pentium Pro, x86 processors have had 36-bit
*physical* addressing. This is why PAE-mode paging was introduced. A
sane BIOS would configure the memory controller to remap some of the
memory above 4G physical to allow for memory mapped devices. It sounds
like this board's BIOS isn't doing that, or at least not reporting it in
the e820 map.
---
Hummm.
Let me restate the fact that I dont understand how PC hardware works, but
I can understand how the area for PCI devices has to come out of the
KERNEL address space, but why does it have to be subtracted from the USER
address space too?
--
Reg.Clemens
reg@dwf.com
prev parent reply other threads:[~2004-06-03 3:13 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-01 7:32 reg
2004-06-01 19:56 ` reg
2004-06-01 20:10 ` Valdis.Kletnieks
2004-06-02 9:56 ` Jurriaan
2004-06-02 12:17 ` Richard B. Johnson
2004-06-02 19:52 ` clemens
2004-06-03 1:11 ` Brian Gerst
2004-06-03 2:32 ` reg
2004-06-03 11:46 ` Richard B. Johnson
2004-06-03 3:03 ` clemens [this message]
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