Messages in this thread | | | From | "Guzman Lugo, Fernando" <> | Date | Thu, 26 Aug 2010 07:38:26 -0500 | Subject | RE: [PATCH 8/9] dspbridge: add map support for big buffers |
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Hi Fujita, ________________________________________ >From: FUJITA Tomonori [fujita.tomonori@lab.ntt.co.jp] >Sent: Thursday, August 26, 2010 1:55 AM >To: Guzman Lugo, Fernando >Cc: linux-omap@vger.kernel.org; linux-kernel@vger.kernel.org; ohad@wizery.com; hiroshi.doyu@nokia.com; ameya.palande@nokia.com; felipe.contreras@nokia.com >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@ti.com> 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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