RE: [PATCH 8/9] dspbridge: add map support for big buffers

[Guzman Lugo, Fernando]

Hi Fujita,
________________________________________
>From: FUJITA Tomonori [fujita.tomonori@xxxxxxxxxxxxx]
>Sent: Thursday, August 26, 2010 1:55 AM
>To: Guzman Lugo, Fernando
>Cc: linux-omap@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; ohad@xxxxxxxxxx; hiroshi.doyu@xxxxxxxxx; ameya.palande@xxxxxxxxx; felipe.contreras@xxxxxxxxx
>Subject: Re: [PATCH 8/9] dspbridge: add map support for big buffers
>
>On Wed, 30 Jun 2010 19:20:59 -0500
>Fernando Guzman Lugo <x0095840@xxxxxx> wrote:
>
>> due to a restriction in scatter gather lists, it can
>> not be created a list for a buffer bigger than 1MB.
>> This patch is spliting big mappings into 1MB mappings.
>
>I don't read the whole thread but the above description is incorrect.
>
>Why can't you use scatter gather chaining? You can create a scatter
>list for a buffer larger than 1MB.

The thing is that ARM architecture does not support SG chaining. This patch should be
seen like a workaround until it is fixed in iovmm module.

Thanks and regards,
Fernando.
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