New framebuffer

Hello All,
 
Hello, 
 
I have to write a frame buffer to control my graphic LCD.  Since this
LCD 
controller has only these I/O (Enable, R/W, Chip Select and D0 ... D7
(data)), 
i'm using GPIO of my microcontroller to control this device. It's why I 
control it through the framebuffer driver. I wonder if I can mmap() a
system 
memory for LCD display.  It's for userland application (like nano-x
engine) 
which some memory mapping is done.   Since the lcd device is not
attached to 
the external bus interface (Address, Data and control IO) of my 
microcontroller,  it's why I wonder if we can mmap() it. Almost of
graphic 
cards can mapped physically the memory because the video memory is
already 
allocated. My case is different because the LCD is connected to GPIO.   
 
For example, Userland application change some bytes (pixels) on this
allocated 
memory, then update is done directly on LCD display.... (ideal world)! 
 
Microcontroller : AT91RM900 from Atmel 
LCD graphic : LM6800 from TopWayDisplay 
              Resolution : 256 X 64 
              1 Color 
 
 
If anybody can help me, I'll appreciate it. 
 
Regards 
 
Christian

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