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Official sunxi OpenEmbedded layer for Allwinner-based boards.
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Jens Lucius b10c844cb2 kernel: move devicetree to machine files, include in sd-card 
Move device tree configuration to machine files. Check for device tree
in sd card creation and include device tree file in first partition.

Signed-off-by: Jens Lucius <info@jenslucius.com>
 		2015-06-10 22:01:24 +02:00
classes kernel: move devicetree to machine files, include in sd-card 2015-06-10 22:01:24 +02:00
conf kernel: move devicetree to machine files, include in sd-card 2015-06-10 22:01:24 +02:00
recipes-bsp Add more devices (LimeA10, Lime2, A13SOM, Forfun Q88DB) 2015-03-03 18:09:46 +01:00
recipes-devtools/python pyA20: Add more olimex boards 2015-03-02 16:39:10 +01:00
recipes-graphics Add more devices (LimeA10, Lime2, A13SOM, Forfun Q88DB) 2015-03-03 18:09:46 +01:00
recipes-kernel/linux kernel: move devicetree to machine files, include in sd-card 2015-06-10 22:01:24 +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 added A20 to description 2014-09-08 12:16:10 +02:00
COPYING.MIT allwinner-a10: initial import. 2012-06-03 19:47:57 +02:00
README.md README: update email 2014-07-26 14:27:02 +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