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rpi-config,README: Add option to enable offline image compositing

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Set this variable to enable support for dispmanx offline compositing
DISMANX_OFFLINE = "1"

This will enable the firmware to fall back to off-line compositing of
Dispmanx elements. Normally the compositing is done on-line, during scanout,
but cannot handle too many elements. With off-line enabled, an off-screen
buffer is allocated for compositing. When scene complexity (number and sizes
of elements) is high, compositing will happen off-line into the buffer.

Heavily recommended for Wayland/Weston.

See: http://wayland.freedesktop.org/raspberrypi.html

Change-Id: I722b20ff5bdba1bdd0683d30bee07c3934c95a1f
Signed-off-by: Alex J Lennon <ajlennon@dynamicdevices.co.uk>
This commit is contained in:
Alex J Lennon 2014-06-14 14:38:13 +01:00 committed by Andrei Gherzan
parent e598f63fbb
commit 6a8c859c2f
2 changed files with 29 additions and 6 deletions
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29
README
View File

@ -35,9 +35,10 @@ Contents:
2.D. Disable overscan
2.E. Set overclocking options
2.F. Optional - Video camera support with V4L2 drivers
2.G. Images
2.H. Boot to U-Boot
2.I. Image with Initramfs
2.G. Optional - Enable offline compositing support
2.H. Images
2.I. Boot to U-Boot
2.J. Image with Initramfs
3. Extra apps
3.A. omxplayer
4. Source code and mirrors
@ -138,7 +139,23 @@ OVER_VOLTAGE = "6"
Set this variable to enable support for the video camera (Linux 3.12.4+ required)
VIDEO_CAMERA = "1"
2.G. Images
2.G. Optional - Enable offline compositing support
==================================================
Set this variable to enable support for dispmanx offline compositing
DISMANX_OFFLINE = "1"
This will enable the firmware to fall back to off-line compositing of
Dispmanx elements. Normally the compositing is done on-line, during scanout,
but cannot handle too many elements. With off-line enabled, an off-screen
buffer is allocated for compositing. When scene complexity (number and sizes
of elements) is high, compositing will happen off-line into the buffer.
Heavily recommended for Wayland/Weston.
See: http://wayland.freedesktop.org/raspberrypi.html
2.H. Images
===========
* rpi-hwup-image
Hardware up image
@ -148,7 +165,7 @@ VIDEO_CAMERA = "1"
Image based on rpi-basic-image which includes most of the packages in this
layer and some media samples.
2.H. Boot to U-Boot
2.I. Boot to U-Boot
===================
To have u-boot load kernel image, set in your local.conf
KERNEL_IMAGETYPE = "uImage"
@ -156,7 +173,7 @@ KERNEL_IMAGETYPE = "uImage"
This will make kernel.img be u-boot image which will load uImage.
By default, kernel.img is the actual kernel image (ex. Image).
2.I. Image with Initramfs
2.J. Image with Initramfs
=========================
To build an initramfs image :
* Set this 3 kernel variables (in linux-raspberrypi.inc for example)

6
recipes-bcm/bootfiles/rpi-config_git.bb
View File

@ -60,6 +60,12 @@ do_deploy() {
echo "# Enable video camera" >>${DEPLOYDIR}/bcm2835-bootfiles/config.txt
echo "start_x=1" >>${DEPLOYDIR}/bcm2835-bootfiles/config.txt
fi
# Offline compositing support
if [ -n "${DISPMANX_OFFLINE}" ]; then
echo "# Enable offline compositing" >>${DEPLOYDIR}/bcm2835-bootfiles/config.txt
echo "dispmanx_offline=1" >>${DEPLOYDIR}/bcm2835-bootfiles/config.txt
fi
}
addtask deploy before do_package after do_install