It seems likely that this device was never intended for anything
other than video. You can probably run X on it with a shadow framebuffer.
See the glide driver. It renders to the 3Dfx Voodoo 1 and 2 boards
by putting the framebuffer in system memory and then copying rectangles
over to the real framebuffer using the Glide(tm) library. You could
have a shadowFB RefreshArea function that did the colorspace conversion
from RGB into YUV.
Mark.
On Fri, 30 May 2003, Jaroslav Vozab wrote:
> Hi,
> I try to implement xfree86 driver for one of IBM PPC based chips. Graphics of
> this chip is not based on RGB colorspace but on YUV colorspace and there are
> two planes one for Y and one for UV. I have no idea how to implement it. I
> can mmap the video memory but i have no idea how to describe how the data
> should be displayed. Is there any possibility to set a callback function that
> draws pixel? Or is possible to describe the format? Or is there any other
> possibilyty how to do it?
>
> Jaroslav
>
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