3.5GB memory limit? (fwd)

Ronald G Minnich rminnich at lanl.gov
Tue Sep 24 12:57:00 CEST 2002

this is kind of interesting ...

---------- Forwarded message ----------
Date: Tue, 24 Sep 2002 10:02:49 -0700
From: Terry Lambert <tlambert2 at mindspring.com>
To: Danny Braniss <danny at cs.huji.ac.il>
Cc: freebsd-hackers at FreeBSD.ORG
Subject: Re: 3.5GB memory limit?

Danny Braniss wrote:
>         the Addendum says:
>         * AMD chipset architecture requieres memory above 3.5GB to be reserved
>           for PCI devices.

We have a winner.

>         Q1: is this AMD specific, or also true for P3/P4?

It's chipset, not CPU specific.  Your question is like asking if,
because your Yugo (car) can't go faster than 100 KPH on one brand
of gasoline, if it's a gasoline problem.

>         Q2: is there any way of accessing the 'lost' memory? ie some device
>             driver?

No, not unless the chipset that imposes the limitation permits
some form of bank selection.

-- Terry

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