[Libdlo] DLFB 0.1 (udlfb)

[Roberto De Ioris]

Hi all, this is the first (prototype) release of a linux
framebuffer module for the displaylink devices.

The module implements a semi-accelerated fbcon and an ioctl that send
update commands to the device.

*** FBCON MODE (1400x1050x16bpp)***

put the Makefile and udlfb.c in a directory (you need to have the kernel
headers installed)

launch make

then (as root)

insmod udlfb.ko

you will see some debug stuff in your dmesg

now map a console to your new framebuffer device (in the fbset package):

con2fbmap 3 1

...will map the third console to /dev/fb1

switch to the third console (ctrl-alt-f3) and you will
see the fbcon.

The only accelerated part is the vertical scolling, more optimizations
will follow in the next days (this is a stripped down version of a
bigger work)

*** MMAP/RW MODE ***

compile the testctl.c code:

gcc -o testctl testctl.c

launch an application that use framebuffer as its output (via mmap or
simple read/write)

Example (as root):

mplayer -vo fbdev:/dev/fb1 <filename>

now update the framebuffer:

./testctl

if you want to redraw bigger (or smaller) area modify the testctl.c code


*** TEST ON MIMO DEVICE ***

The module code is forced on 1400x1050 at 16bit.

MIMO devices supports 800x480

You need to modify the first (configuration) line of the code in this
way:

// CONFIGURE YOUR DISPLAY HERE

#define FB_W 800
#define FB_H 480

#define DLO_MODE_DATA DLO_MODE_DATA_800_480_60_24_0
#define DLO_MODE_ENABLE DLO_MODE_ENABLE_800_480_60_24_0

// END OF CONFIGURATION


*** CAUTION ***

this is a proof of concept, it contains leaks, bad code practice and all
sort of evil things, i hope to release a real version in the next week
(if the world is still rotating after your tests).

-- 
Roberto De Ioris
http://unbit.it
JID: roberto at jabber.unbit.it
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