Re: [Linux-fbdev-devel] Mirrored and shiftet fonts and logos

[James S. <jsi...@in...>]

Sounds like a endian issue. =Maybe the frmaebuffer and the processor are 
different endianess.


On Sat, 14 Dec 2002, André Stierenberg wrote:

> Hello,
> 
> i´m using the framebuffer driver pxafb for my board using the pxa processor
> (Accelent IDP). I have a 4 bit monocrom display. when I run the framebuffer
> I have some problems. The text in the console it in some way shifted. The
> two parts of the font are switched. The first 4 pixels are at dest+2 and the
> last 4 pixels at dest+0. And both parts are mirrored. Now I have done the
> following in fbcon_cfb4.c in function fbcon_cfb4_putcs:
> 
>   for (rows = fontheight(p), dest = dest0; rows-- ; dest += bytes) {
>       fb_writew((nibbletab_cfb4[rv(*cdat) >> 4] & eorx) ^ bgx, dest+2);
>       fb_writew((nibbletab_cfb4[rv(*cdat++) & 0xf] & eorx) ^ bgx, dest+0);
>   }
> 
> 
> The function rv will reverse the bit order (bit 1 is bit 8, bit 2 is bit 7..
> etc.).
> And i have swaped the destination offset.
> Now the characters are printed correctly. And in the linux logo, the
> pinguin, something is also wrong. It seems the some pixels are mirrored too
> whereas other pixels are correct.
> 
> What could this be and in what way can i fix the problem?
> 
> Andre
> 
> 
> 
> 
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