Re: [Linux-fbdev-devel] how to handle MSB framebuffer in LSBkernel?

[Krzysztof H. <krz...@wp...>]

Dnia 13-08-2007 o godz. 22:15 Antonino A. Daplas napisał(a):
> On Mon, 2007-08-13 at 21:41 +0200, Krzysztof Helt wrote:
> > Hi,
> > 
> > I have a problem how to handle MSB framebuffer (s3c2410fb) in 
LSB 
> > kernel (typical ARM kernel).
> > 
> > It is not a problem in 8+ bpp (bits per pixel) modes.
> > The problem is how to reverse pixel order in 1, 2 and 4 bpp
> > modes, because it does not work otherwise. Is there any fb 
flag
> > or something?
> 
> If 4bpp, ab|cd|ef is reversed as ba|dc|ef?

Yes.

> I don't think the drawing
> libraries do not support pixel reversal. Either the hardware 
does it, or
> we create a library for this.
> 

It may be not so important if it is difficult/slow. Most PDAs 
uses TFT so support 8+ bpp modes. If it is not easy, this may 
stay as it is (mean still broken) or these modes (1-4bpp)  can be 
removed than added fixed and tested if someone needs them.

Regards,
Krzysztof

> 
> 

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