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Official sunxi OpenEmbedded layer for Allwinner-based boards.
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Jens Lucius 339dc8af45 python: added pyA20 for controlling GPIO 
pyA20 allows controlling GPIO, SPI and I2C on Allwinner boards from python.
Although it is named A20 it should work on A10, A13 and other CPUs.
Provided by Olimex for their boards but should work for others as well.
Tested on A20-OLinuXino-MICRO.

Signed-off-by: Jens Lucius <info@jenslucius.com>
2014-11-28 09:22:02 +01:00
classes sdcard_image-sunxi.bbclass: make sunxi-sdimg image dependent on rootfs type 2014-03-06 00:39:47 +11:00
conf Append the shortened git revision to the u-boot version 2014-10-01 22:42:20 +02:00
recipes-bsp This adds support to build for the Olimex A20-OLinuXino-LIME 2014-09-29 22:19:37 +02:00
recipes-devtools/python python: added pyA20 for controlling GPIO 2014-11-28 09:22:02 +01:00
recipes-graphics libdri2: added missing pkgconfig inherit 2014-11-11 19:55:32 +01:00
recipes-kernel/linux This adds support to build for the Olimex A20-OLinuXino-LIME 2014-09-29 22:19:37 +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