linux-kernel - Macbook 4G only see 3G

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Date:	Wed, 10 Jun 2009 18:47:50 -0600
From:	"Trenton D. Adams" <trenton.d.adams@...il.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Macbook 4G only see 3G

Hi Guys,

Has anyone been doing any development in the area of enabling 4G for
any PC that doesn't have an option in the BIOS?  The Mac OS X sees the
full 4G, but Linux does not.

tdamac ~ # uname -a
Linux tdamac 2.6.30-rc7-dirty #3 SMP Fri Jun 5 21:24:29 MDT 2009
x86_64 Intel(R) Core(TM)2 CPU T7400 @ 2.16GHz GenuineIntel GNU/Linux

I'm curious if there's some simple piece of code that can disable
legacy PCI assignment of that extra 1G that Mac OS X does, but not the
Linux kernel?  I know I disabled something called legacy mode or
something, in one of my 64 bit machines, and the 4G then showed up.
But, seeing the Mac uses EFI, I'm unable to do that.

If no one has done any development in that area, does anyone have any
idea where to look up the technical aspects of adding this code, and
where in the kernel I would put it if I found out how to do it?

Thanks.
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