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Official sunxi OpenEmbedded layer for Allwinner-based boards.
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Christian Ege fbc46658ef Added a machine configuration for the Olimex A20-OLinuXino Lime board 
This is based on the Olimex A20-OLinuXino board

Signed-off-by: Christian Ege <k4230r6@gmail.com>
2014-09-27 20:18:38 +02:00
classes sdcard_image-sunxi.bbclass: make sunxi-sdimg image dependent on rootfs type 2014-03-06 00:39:47 +11:00
conf Added a machine configuration for the Olimex A20-OLinuXino Lime board 2014-09-27 20:18:38 +02:00
recipes-bsp sunxi-board-fex: trivial: Remove invalid comment 2014-04-23 16:56:02 +02:00
recipes-graphics Fix build and usage of sunxi-mali 2014-09-11 14:26:46 +00:00
recipes-kernel/linux linux 3.4: update to latest git 2014-04-08 09:55:42 +02:00
recipes-multimedia/gstreamer gst-plugin-cedar: import PoC gstreamer 0.10 plugin 2014-01-16 13:52:23 +01:00
recipes-support/sunxi-tools sunxi-tools: Fix build of sunxi-tools-native 2013-10-25 14:18:12 +02:00
COPYING.MIT allwinner-a10: initial import. 2012-06-03 19:47:57 +02:00
README.md README: update email 2014-07-26 14:39:31 +02:00

README.md

meta-sunxi

Official sunxi OpenEmbedded layer for Allwinner-based boards.

This layer depends on the additional layer:

meta-openembedded: git://git.openembedded.org/meta-openembedded

Tested with core-image-base.

Maintainers:

Performance

The default machine settings are meant to be the lowest common denominator, maximizing generality. Significantly better performance (2x-3x) can be achieved with the following settings:

Allwinner A20

For Allwinner A20 (Cubieboard2/CubieTruck), the following tuning options are recommended:

Enable hardfloat, thumb2 and neon capabilities

DEFAULTTUNE = "cortexa7hf-neon-vfpv4"

This tuning profile takes advantage of the Allwinner A20 hardfloat, neon and vfpv4 capabilities.

Change CPU governor to ondemand, and tune settings

echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
echo 336000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq
echo 912000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
#More aggressive
#echo 1008000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
echo 40 > /sys/devices/system/cpu/cpufreq/ondemand/up_threshold
echo 200000 > /sys/devices/system/cpu/cpufreq/ondemand/sampling_rate

This code changes the default CPU governor from fantasy to ondemand, and tunes its settings, as recommended at http://linux-sunxi.org/Cpufreq

For additional discussion, see https://github.com/linux-sunxi/meta-sunxi/issues/25