On 26/04/17 09:11 PM, Gerd Hoffmann wrote:
> Hi,
>
>>>> Just to reiterate, this won't work for the radeon driver, which programs
>>>> the GPU to use (effectively, per the current definition that these are
>>>> little endian GPU formats) DRM_FORMAT_XRGB8888 with pre-R600 and
>>>> DRM_FORMAT_BGRX8888 with >= R600.
>>>
>>> Hmm, ok, how does bigendian fbdev emulation work on pre-R600 then?
>>
>> Using a GPU byte swapping mechanism which only affects CPU access to
>> video RAM.
>
> That is done using the RADEON_TILING_SWAP_{16,32}BIT flag mentioned in
> another thread?
Right.
> What about dumb bos? You've mentioned the swap flag isn't used for
> those. Which implies they are in little endian byte order (both gpu and
> cpu view).
Right, AFAICT from looking at the code.
> Does the modesetting driver work correctly on that hardware?
Not sure.
--
Earthling Michel Dänzer | http://www.amd.com
Libre software enthusiast | Mesa and X developer
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