linux-kernel - Re: Macbook 4G only see 3G

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Date:	Thu, 11 Jun 2009 11:21:59 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	"Trenton D. Adams" <trenton.d.adams@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Macbook 4G only see 3G

On Wed, 10 Jun 2009 17:54:39 -0700
Yinghai Lu <yhlu.kernel@...il.com> wrote:

> On Wed, Jun 10, 2009 at 5:47 PM, Trenton D.
> Adams<trenton.d.adams@...il.com> wrote:
> > 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
> 
> boot log?
> 
I bet you should set CONFIG_HIGHMEM64G or use x86-64 kernel because of
1G of memory hole somewhere below 4G.

Thanks,
-Kame

> YH
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