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Official sunxi OpenEmbedded layer for Allwinner-based boards.
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Kristof Robot 9a2692fcde sdcard_image-sunxi.bbclass: adding ext3 dependency (resolves #46) 
Without this explicit dependency,
a race condition would be present between the generation of the sd image
and the generation of the ext3 file,
which leads to corrupt SD images in some circumstances.

Based on meta-raspberrypi commit a760ea5fa2
2014-03-04 22:37:31 +01:00
classes sdcard_image-sunxi.bbclass: adding ext3 dependency (resolves #46) 2014-03-04 22:37:31 +01:00
conf kernel-modules to include are now defined in sunxi.inc 2014-02-12 20:40:02 +01:00
recipes-bsp u-boot: fix PV 2014-02-14 13:23:25 +01:00
recipes-graphics xf86-video-fbturbo: fix PE 2014-02-18 13:02:15 +01:00
recipes-kernel/linux linux: run all defconfigs through 'make savedefconfig' 2014-02-23 08:44:58 +01:00
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.md: added performance options (resolves #25) 2014-02-03 18:37:56 +01:00

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