Hejsa
I had got a board with an at91sam9263 cpu
I tried to download directfb-1.2.3, which should have BGR support
Then I compiled directfb and installed it.
in /etc/directfb i have pixelformat=BGR555

By startup an example application I got

(*) DirectFB/Core/WM: Default 0.3 (directfb.org)
(!) DirectFB/DirectFBCreate: Setting desktop resolution to 240x320 failed!
     -> Using default resolution.
(!) DirectFB/DirectFBCreate: Setting desktop format failed!
     -> Using default format.
(!) DirectFB/DirectFBCreate: Setting desktop buffer mode failed!
     -> No virtual resolution support or not enough memory?
        Falling back to system back buffer.
(!) DirectFB/DirectFBCreate: Setting system memory desktop back buffer 
failed!
     -> Using front buffer only mode.
(!) DirectFB/core/layers: Could not set primary region config!
    --> Not supported!
(!) InitLayers: Could not get primary region of layer 0!
    --> Not supported!
df_andi.c <462>:
        (#) DirectFBError [DirectFBCreate( &dfb )]: Not supported!

In the function dfb_fbdev_mode_to_var   in the file   
systems/fbdev/fbdev.c  there are no
  case DSPF_BGR555:

I added this "case" and the test application start up properly now



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