Re: DSS2 broken with 36-rc1

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Let's CC Russell for this one.

On Wed, Aug 25, 2010 at 11:05 AM, Tomi Valkeinen
<tomi.valkeinen@xxxxxxxxx> wrote:
> Hi,
>
> On Mon, 2010-08-23 at 09:06 +0200, ext Mike Rapoport wrote:
>> Mike Rapoport wrote:
>
>>  From 81e9278ad27bc91be42105321e0e26d0be9e883b Mon Sep 17 00:00:00 2001
>> From: Mike Rapoport <mike@xxxxxxxxxxxxxx>
>> Date: Mon, 23 Aug 2010 09:40:09 +0300
>> Subject: [PATCH] OMAP: DSS2: OMAPFB: use phys_to_virt for RAM mappings
>>
>> After commit 309caa9cc6ff39d261264ec4ff10e29489afc8f8 (ARM: Prohibit
>> ioremap() on kernel managed RAM) it is impossible to ioremap SDRAM for
>> the framebuffer. Use phys_to_virt for kernel managed RAM mapping and
>> ioremap for other memory types
>
> Hmm. omapfb reserves/allocates the ram using memblock, and obviously
> memory from memblock is "kernel managed RAM". What does it mean? The RAM
> is already mapped? I guess so, if phys_to_virt() works. (I guess the
> whole RAM is mapped automatically). With what caching? How can we get
> writecombining for this memory?
>
> Looking at the description of "ARM: Prohibit ioremap() on kernel managed
> RAM" it sounds to me that we cannot have writecombining for framebuffer
> memory, if it's "kernel managed RAM".
>
>  Tomi
>
>
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