Difference between revisions of "Framebuffer"

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(Tips)
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==Tips==
 
==Tips==
* stop blinking cursor:
+
* To stop blinking cursor:
 
  # echo 0 > /sys/class/graphics/fbcon/cursor_blink
 
  # echo 0 > /sys/class/graphics/fbcon/cursor_blink
 
or
 
or
 
  # echo -e '\033[?17;0;0c' > /dev/tty0
 
  # echo -e '\033[?17;0;0c' > /dev/tty0
* grab a screenshot of a running framebuffer application: [[FBGrab]]
+
* To grab a screenshot of a running Framebuffer application, use [[FBGrab]]
 +
* To activate Framebuffer low power mode:
 +
# echo 1 > /sys/class/graphics/fb0/blank
 +
* To leave Framebuffer low power mode:
 +
# echo 1 > /sys/class/graphics/fb0/blank
  
 
=Links=
 
=Links=

Revision as of 14:04, 25 July 2008

On this page you will find usefull informations to have a working Linux Framebuffer on your board.

Kernel configuration

Framebuffer is already configured (for Microtips LCD) in standard/default Armadeus kernel image

  • launch Linux kernel configuration:
 [armadeus]$ make linux-menuconfig
  • in "Char Devices" menu, activate "Virtual Terminal" and "Support for virtual terminal on console"
  • activate Device drivers -> Graphic support -> Support for Framebuffer -> Motorola iMX LCD support and choose your LCD in LCD Panel
  • "Console display driver support ->Frame buffer console

support" (deactivate VGA stuff & add some fonts), then choose 224 colour boot logo

  • recompile the kernel:
[armadeus]$ make linux
  • , now to have console on serial port, you will have to add "console=ttySMX0,115200n8" to your boot parameters
  • reflash kernel image on your board and enjoy (you should see Linux logo on screen at startup)!

Userland

If you have devfs activated, framebuffer device can be accessed with /dev/fb/0. Otherwise, you will need to create the device node with

 # mknod c 29 0

You can activate some test tools from the armadeus build process:

 $ make menuconfig -> packages -> fbset

You have several test tools on yahoo groups to play a little with the framebuffer.

Tips

  • To stop blinking cursor:
# echo 0 > /sys/class/graphics/fbcon/cursor_blink

or

# echo -e '\033[?17;0;0c' > /dev/tty0
  • To grab a screenshot of a running Framebuffer application, use FBGrab
  • To activate Framebuffer low power mode:
# echo 1 > /sys/class/graphics/fb0/blank
  • To leave Framebuffer low power mode:
# echo 1 > /sys/class/graphics/fb0/blank

Links