i have a question about:ppc pci and frame_buffer

i have a question about:ppc pci and frame_buffer

[利平 张]

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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?? 

       
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Re: I have a question about:ppc pci and frame_buffer

[Erik Christiansen]

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