From: magnus.damm@gmail.com (Magnus Damm)
To: linux-arm-kernel@lists.infradead.org
Subject: CONSISTENT_DMA_SIZE limitations
Date: Wed, 28 Apr 2010 16:53:40 +0900 [thread overview]
Message-ID: <m2gaec7e5c31004280053kbc268921g75f7d447ea966576@mail.gmail.com> (raw)
In-Reply-To: <EAF47CD23C76F840A9E7FCE10091EFAB02C5172F4B@dbde02.ent.ti.com>
Hi Santosh,
On Wed, Apr 28, 2010 at 4:07 PM, Shilimkar, Santosh
<santosh.shilimkar@ti.com> wrote:
>> On Wed, Apr 28, 2010 at 2:25 PM, Magnus Damm <magnus.damm@gmail.com> wrote:
>> > Extending CONSISTENT_DMA_SIZE seems like a good idea to me, but I'm
>> > not sure if doing so will break something else. Perhaps I need to
>> > rework some code in arch/arm/mm/dma-mapping.c?
> Not the best way but works is :
> You can override the default setting of 2MB to whatever memory you need and
> then use the dma_alloc_coherent(), to allocate from this space.
>
> Just ensure that you don't ioremap this memory with different cache-attribute
> otherwise you will end up in the alias mapping of same memory which is not
> allowed on newer ARMv7.
Good idea. =) Thanks for your suggestions.
/ magnus
next prev parent reply other threads:[~2010-04-28 7:53 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-28 6:25 CONSISTENT_DMA_SIZE limitations Magnus Damm
2010-04-28 6:47 ` Eric Miao
2010-04-28 7:07 ` Shilimkar, Santosh
2010-04-28 7:53 ` Magnus Damm [this message]
2010-04-28 7:08 ` Magnus Damm
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