i have a question about:ppc pci and frame_buffer

now i have a question:
  i know ppc is big_endian and pci bus is little_endian.i made a graphics pci card use big_endian.
  when i use graphics card to show QT 's picture through VGA ,the color is not what i wanted, it's inversed ,others are in right position.
  here below is what i want :
  #################################################
  0..................7  8............15 16..............24 25.................31 
           B                    G                   R                TRANS
  now it is this:
  #################################################
  0..................7  8............15 16..............24 25.................31 
        TRANS               R                   G                   B
  #################################################
   
  through mmap, the ppc display the screen color through direct pci bus control ,how can i change it?? 
  change kernel?? (i don't know where to change)
  or change others?? 

       
---------------------------------
抢注雅虎免费邮箱3.5G容量，20M附件！ 

On Thu, Jul 26, 2007 at 03:58:04PM +0800, ???? ?? wrote:

  here below is what i want :
  #################################################
  0..................7  8............15 16..............24 25.................31 
           B                    G                   R                TRANS
  now it is this:
  #################################################
  0..................7  8............15 16..............24 25.................31 
        TRANS               R                   G                   B

In U-boot, there is what you might do yourself, perhaps:

#define LONGSWAP(x) ((((x) & 0x000000ff) << 24) | (((x) & 0x0000ff00) << 8)|\
           (((x) & 0x00ff0000) >>  8) | (((x) & 0xff000000) >> 24) )
#define PCISWAP(x)   LONGSWAP(x)

Any good for your purpose?

Erik