To: "Alejandro Bonilla" <abonilla@linuxwireless.org>
Cc: Marcel Holtmann <marcel@holtmann.org>, linux-kernel@vger.kernel.org
Subject: Re: 4GB memory and Intel Dual-Core system
References: <1130445194.5416.3.camel@blade> <52mzkuwuzg.fsf@cisco.com>
	<20051027204923.M89071@linuxwireless.org>
	<1130446667.5416.14.camel@blade>
	<20051027205921.M81949@linuxwireless.org>
	<1130447261.5416.20.camel@blade>
	<20051027211203.M33358@linuxwireless.org>
From: ebiederm@xmission.com (Eric W. Biederman)
Date: Fri, 28 Oct 2005 09:29:34 -0600
In-Reply-To: <20051027211203.M33358@linuxwireless.org> (Alejandro Bonilla's
 message of "Thu, 27 Oct 2005 17:15:50 -0400")
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"Alejandro Bonilla" <abonilla@linuxwireless.org> writes:

>> so there is no way to give me back the "lost" memory. Is it possible
>> that another motherboard might help?
>
> AFAIK, No. AMD and Intel will always do the same thing until we all move to
> real IA64.

IA64 inherits this part of the architecture from x86, so no magic fix.
This is a fundamentally a chipset limitation, not an architectural bug.

rev-E amd64 cpus from AMD all have memory hoisting support,
as do all server chipsets from Intel for the last several years.

To avoid this you just need a good chipset and a good BIOS implementation.
Any recent server board should be fine.  Hopefully the desktop boards
will catch up soon.

Eric
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