c8e0d44307
The firmware for these drivers breaks parallel make install with recent versions of make: | make[1]: *** No rule to make target `/build/v2013.12/build/tmp-angstrom_v2013_12-eglibc/work/olinuxino_a20-angstrom-linux-gnueabi/linux/3.4.79-r0/image/lib/firmware/./', needed by `/build/v2013.12/build/tmp-angstrom_v2013_12-eglibc/work/olinuxino_a20-angstrom-linux-gnueabi/linux/3.4.79-r0/image/lib/firmware/ti_3410.fw'. Stop. Since both of them are rarely used and virtually never on ARM systems just disable them. Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
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:
- Nicolas Aguirre aguirre.nicolas@gmail.com
- Enrico Butera ebutera@users.berlios.de
- Sergey Lapin slapin@ossfans.org
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