Screen Refresh

[Lucas Correia Villa Real <lucasvr@gobolinux.org>]

Hi,

I'm writing a device driver for a monochrome LCD display managed by a 
controller that will be plugged into the CPU through a SPI, that is, I cannot 
directly memory-map it's address, since the communication will be done via 
a serial interface.

I've seen good chunks of code tonight (fbcon.c, fbmem.c and fbcon_mfb.c), but 
an unique question still remains: I didn't see anywhere *how* the buffer is 
updated to the video card. As far I could see on others drivers that I've 
read, they are doing that by memory mapping the video card's memory, and 
hence any write done into the buffer will be automagically reflected on the 
screen.

On my case I probably won't be able to memory map it's video memory. So, is 
there a way to get notified (at driver level) when some write is going to 
happen? Or should I just install a timer and use some kind of 
double-buffering scheme to verify if changes happened?

Many thanks in advance,
Lucas


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