Re: [PATCH 1/5]: drm: ati_pcigart: Do not access I/O MEM space using pointer derefs.

[Dave Airlie <airlied@gmail.com>]

On Thu, Feb 12, 2009 at 9:09 PM, David Miller <davem@davemloft.net> wrote:
> From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Date: Thu, 12 Feb 2009 21:35:59 +1100
>
>> Oh BTW something else to be careful with, though I suppose it's working
>> some what by accident right now... when the GART is in the frame buffer
>> it gets applied the current fb swapper setting... ouch !
>>
>> So it might be a good idea, if we're going to use DRM_READ/WRITE32 which
>> afaik are readl/writel (ie, swapping) to make sure we at least
>> temporarily disable that swapper while whacking the GART.
>
> Cute.

Dave,

are you on a PCI or PCIE card, I've no idea what buses you have on sparc64.

On the PCI cards the GART table will always be in main memory.
PCIE always in VRAM.

Dave.

>
> I wonder if this is what is tripping me up.
>
> But, looking more closely, it appears that:
>
> 1) The kernel radeon framebuffer driver doesn't mess with
>   the framebuffer endianness setting.
>
> 2) On >= R300 (which my chip is), Xorg leaves it alone too.
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