xorg fbdev support for < 8 bits per pixel

Dushara Jayasinghe dushara.jayasinghe at hydrix.com
Thu May 12 00:58:33 PDT 2011

Hi all,

Just saw the thread regarding kdrive being >/< obsolete. Pity spent a 
few weeks trying to bring up Xfbdev :-(

Anyway, just would like to find out, how much effort it would take to 
add support for devices with 1/2 bits/pixel depth. I noticed that the 
current xorg-fbdev implementation doesn't support these depths.

Just to add context to the question, I'm working on an embedded device 
with a monochrome LCD. The CPU can generate grayscale images by upping 
the frame-rate and modulating the pixels but the hardware implementation 
limits the max FR so I can only support about 2 bits per pixel depth.

Would anyone be able to provide some quick info on the areas I need to 
focus on please?

Thank you

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