[U-Boot] Bug in cfb_console driver

[Anatolij Gustschin]

On Wed, 21 Mar 2012 02:54:02 -0700 (PDT)
Pali Rohár <pali.rohar at gmail.com> wrote:

> On Saturday 10 March 2012 14:06:23 Pali Rohár wrote:
> > On Tuesday 06 March 2012 10:25:57 Anatolij Gustschin wrote:
> > > Hi,
> > > 
> > > On Mon, 05 Mar 2012 11:42:13 +0100
> > > Pali Rohár <pali.rohar at gmail.com> wrote:
> > > ...
> > > 
> > > > Hi, thanks. If you need some more info write me.
> > > 
> > > Can you please test with attached patch? Does it help to solve
> > > your problem on N900?
> > > 
> > > Thanks,
> > > Anatolij
> > 
> > Hi! This patch solving problem on my N900.
> 
> Hi, I found a problem why code (without) this patch garbage display 
> output. I played with code in function video_draw_cursor and every 
> time when I tried to only read what is stored in *dest, on n900 
> dispaly was show some random white or blue pixel. This code not 
> working on n900:
> 
> static u8 foo;
> ...
> for (y 	for (x 		u8 *dest 		foo 		*dest 	}
> }
> 
> But if I commented assign foo 
> So I think that reading memory of framebuffer on n900 does not working 
> (it also write something somewhere...) What do you think, where can be 
> problem?

I have a suspicion that your framebuffer area configured for the
display controller is not exclusively used. In another email [1]
to Marek I explained where the problem could be.

Thanks,
Anatolij

[1] http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/123527/focus=127720