8 words bursts for fbdev driver

8 words bursts for fbdev driver

[xcsnake]

Hello,

I have posted this message on the linux-kernel mailing list, but I think it
could be more appropriate here.
I'm working on a FPGA vga controller, with an arm cpu (at91rm9200). My FPGA is
plugged on a 16 bits data bus. I'm trying to develop the framebuffer driver,
from the epson s1d13xxxfb driver to use my controller. I have a first driver
which works well. To accelerate my controller, I would like to read and write in
my video memory (controlled by the FPGA) by 8 words bursts. Is it possible to
tell the kernel that the memory must be accessed only by 8 words bursts ??
My driver is available on http://xcsnake.free.fr/driver

Thanks a lot

Mickaël

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Re: 8 words bursts for fbdev driver

[Antonino A. Daplas]

On Mon, 2007-05-28 at 17:25 +0200, xcsnake@free.fr wrote:
> Hello,
> 
> I have posted this message on the linux-kernel mailing list, but I think it
> could be more appropriate here.
> I'm working on a FPGA vga controller, with an arm cpu (at91rm9200). My FPGA is
> plugged on a 16 bits data bus. I'm trying to develop the framebuffer driver,
> from the epson s1d13xxxfb driver to use my controller. I have a first driver
> which works well. To accelerate my controller, I would like to read and write in
> my video memory (controlled by the FPGA) by 8 words bursts. Is it possible to
> tell the kernel that the memory must be accessed only by 8 words bursts ??
> My driver is available on http://xcsnake.free.fr/driver

You can write your own fillrect, imageblit and copyarea routine. The
same with fb_read and fb_write.  For userland that mmap's the
framebuffer, I don't think there's a way to tell them how to access the
framebuffer.

Tony 



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