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Re: [PATCH] MIPS: Bcm47xx: Fix 128MB RAM support

from [Ralf Baechle] [Permanent Link][Original]
To: Hauke Mehrtens <hauke@hauke-m.de>
Subject: Re: [PATCH] MIPS: Bcm47xx: Fix 128MB RAM support
From: Ralf Baechle <ralf@linux-mips.org>
Date: Mon, 22 Feb 2010 20:14:40 +0100
Cc: linux-mips@linux-mips.org
In-reply-to: <1266691880-372-1-git-send-email-hauke@hauke-m.de>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <1266691880-372-1-git-send-email-hauke@hauke-m.de>
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.5.20 (2009-08-17) 
On Sat, Feb 20, 2010 at 07:51:20PM +0100, Hauke Mehrtens wrote:

> Ignoring the last page when ddr size is 128M. Cached
> accesses to last page is causing the processor to prefetch
> using address above 128M stepping out of the ddr address
> space.

Is this a hardware issue prefetching issue?  The kernel should not try
CPU prefetch instructions at all on non-coherent CPUs such as the
BCM47xx.

  Ralf
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