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Official sunxi OpenEmbedded layer for Allwinner-based boards.
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Sergey Matyukevich 941e978370 Add support for pcduino devices 
Add support for LinkSprite pcDuino1 device and its flavors
including pcduino-lite and pcduino-lite-wifi:

- add pcduino machine description
- enable CONFIG_SPI_SPIDEV in upstream kernel defconfig to provide simple userspace access
  to SPI devices on Arduino shields

Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com>
2016-05-18 22:17:42 +03:00
classes Remove image dependency on fex for mainline 2015-11-19 16:58:24 +01:00
conf Add support for pcduino devices 2016-05-18 22:17:42 +03:00
recipes-bsp Remove old U-Boot 2016-03-20 19:16:33 +01:00
recipes-devtools/python pyA20: Add more olimex boards 2015-03-02 16:39:10 +01:00
recipes-graphics sunxi-mali test 2015-09-25 22:46:33 -04:00
recipes-kernel/linux Add support for pcduino devices 2016-05-18 22:17:42 +03:00
recipes-multimedia/gstreamer gst-plugin-cedar: import PoC gstreamer 0.10 plugin 2014-01-16 13:52:23 +01:00
recipes-support/sunxi-tools update sunxi-tools 2015-09-21 15:54:00 +02:00
COPYING.MIT allwinner-a10: initial import. 2012-06-03 19:47:57 +02:00
README.md README.md: improve instructions for sunxi versions 2015-09-21 22:04:36 -04:00

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:

Kernel / U-Boot Version

Most Allwinner devices and hardware are supported in mainline kernel and U-Boot, so this layer builds mainline by default. There is a custom U-Boot and Kernel version for sunxi devices which includes some special drivers not mainlined. These versions are rather old (3.4 for kernel and 2014.04 for U-Boot), but may support more functions and devices than current mainline

If you want to switch back to sunxi versions for some reasons (no device tree available, unsupported hardware), either:

  • change the file conf/machine/include/sunxi.inc to include the following block

  • edit your conf/local.conf to add the following block

    PREFERRED_PROVIDER_u-boot="u-boot-sunxi" PREFERRED_PROVIDER_virtual/bootloader="u-boot-sunxi" PREFERRED_PROVIDER_virtual/kernel="linux-sunxi"

If you already have built the mainline versions it might be necessary to reset the build directories with:

bitbake -c clean linux
bitbake -c clean u-boot

Also, older kernel versions such as this don't build successfully with any gcc version 5.0 or newer. Since gcc-5.2 is the current default compiler on master, if you wish to build this kernel with master you'll need to add the following to your conf/local.conf:

GCCVERSION = "4.9%"

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