linux-kernel - Re: [PATCH] powerpc 4xx: DDR0_14[REDUC] decoded incorrectly

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Message-ID: <20090309171243.GA26415@zod.rchland.ibm.com>
Date:	Mon, 9 Mar 2009 13:12:43 -0400
From:	Josh Boyer <jwboyer@...ux.vnet.ibm.com>
To:	Mikhail Zolotaryov <lebon@...on.org.ua>
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org
Subject: Re: [PATCH] powerpc 4xx: DDR0_14[REDUC] decoded incorrectly

On Mon, Mar 09, 2009 at 06:21:36PM +0200, Mikhail Zolotaryov wrote:
> Hi,
>
> according to the PPC440EPx Embedded Processor User Manual (rev 1.14)  
> DDR0_14[REDUC] bit has the following meaning:
>
> REDUC - Enable the half data path feature of the controller
> 0 = Standard operation using full 64/72-bit memory bus
> 1 = Memory data path width is 32/40 bits
>
> However, "1" is decoded as 64 bit (8 byte), "0" - as 32 bit (4 byte) bus  
> by the kernel code. My understanding is this is not correct - patch  
> attached.

You are missing the Signed-off-by tag that is needed.

Aside from that, I'm curious if you found this just through inspection, or
if you actually had a problem because of it.  Your fix seems correct, yet
I've had no problems with my boards at all.

josh
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