l4-hackers Digest, Vol 105, Issue 9

Adam Lackorzynski adam at os.inf.tu-dresden.de
Fri Jan 27 21:51:44 CET 2012


On Thu Jan 26, 2012 at 11:10:17 +0900, jangwoo wrote:
> I have similar problem.
> Currently  applications on linux can't use mmap of framebuffer(/dev/fb0).
> When apps access memory to get through mmap, it occurs page fault.
> Without goos, fbdrv of L4 cell, mag, l4fb drv in linux, etc on,
> Is there ways that it modify <linux lcd device driver> little bit as other
> linux device drivers
> In other words, could Apps use allocated  memory in linux kernel?
> As a guide,
> Because of using dedicated frame buffer only in one cell(linux), it mustn't
> use things like goos, mag.

I'm not sure I'm getting your question right but you want to have an
L4Linux with direct fb access? This is a rather unusual setup but
nevertheless possible. In any case you need fbdrv because it's setting
up the fb. One common exception is on x86 where the bootloader can also
set it up. Regarding input handling L4Linux would probably do it with
its own drivers.

Adam                 adam at os.inf.tu-dresden.de
  Lackorzynski         http://os.inf.tu-dresden.de/~adam/

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