linux-kernel - Re: [PATCH] Change the internal SRAM memory type MT_MEMORY

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Message-ID: <20130613134342.GE18614@n2100.arm.linux.org.uk>
Date:	Thu, 13 Jun 2013 14:43:43 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Nicolas Ferre <nicolas.ferre@...el.com>
Cc:	Wenyou Yang <wenyou.yang@...el.com>,
	linux-arm-kernel@...ts.infradead.org, linux@...im.org.za,
	plagnioj@...osoft.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Change the internal SRAM memory type
	MT_MEMORY_NONCACHED

On Thu, Jun 13, 2013 at 03:19:58PM +0200, Nicolas Ferre wrote:
> On 08/06/2013 04:17, Wenyou Yang :
>> Because MT_DEVICE is not executable in armv7, we change
>> the internal SRAM memory type to MT_MEMORY_NONCACHED.
>> As it seems that caching this internal SRAM memory is not necessary,
>> we chose the this memory type.
>>
>> Signed-off-by: Wenyou Yang <wenyou.yang@...el.com>
>
> Acked-by: Nicolas Ferre <nicolas.ferre@...el.com>
>
> But Russell, can we have your advice on this as you made us re-think  
> about that during previous patch discussion?

I think this is fine - using MT_MEMORY_NONCACHED gets you a memory-like
mapping instead of a strongly ordered or device mapping, but without
caching issues, which is what you want here.
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