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

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 21:36:07 +0100
Cc: linux-mips@linux-mips.org
In-reply-to: <4B82E827.8030005@hauke-m.de>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <1266691880-372-1-git-send-email-hauke@hauke-m.de> <20100222191440.GA12818@linux-mips.org> <4B82E827.8030005@hauke-m.de>
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.5.20 (2009-08-17)
On Mon, Feb 22, 2010 at 09:25:11PM +0100, Hauke Mehrtens wrote:

> > 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.
> 
> This is a hardware issue on the bcm47xx when 128MB ram is present. This
> workaround is out of broadcom's kernel sources and is included in
> OpenWRT for some months. Without this patch the kernel does not even
> print out anything and with this patch it is working.

Thanks!

I was asking to ensure this isn't a workaround for an already solved
kernel software issue.  Patch applied,

  Ralf

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