Re: basic FB development questions

[Christian Schoenebeck <cuse@users.sourceforge.net>]

Es geschah am Wednesday, 23. April 2008 11:01 als Geert Uytterhoeven schrieb:
> On Wed, 23 Apr 2008, Christian Schoenebeck wrote:
> > First of all, AFAIK most FB drivers are based upon memory mapped IO,
> > right? But in my case the graphics are forwarded via calls of Linux's USB
> > subsystem. Which FB approach would suggest in this case? Something like
> > the virtual framebuffer driver with some kind of static allocated buffer?
> > If yes, what kind of function would I have to implement to trigger the
> > screen sync between that modified buffer and the hardware (that is
> > sending the buffer's data via USB to the device)? Or should I implement
> > mmap? I mean: I know everything about the USB side to recognize the
> > device and sending data etc., I just don't know how to establish a FB
> > callback or something to "flush" the suggested graphics buffer.
>
> Documentation/fb/deferred_io.txt

Ah, that's a good one!

Seems the "hecubafb" driver is a very good candidate for stealing code for 
that USB LCD FB driver.

Thanks a lot Geert!

CU
Christian

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