RK3399 4.4内核 修改DDR频率

查看当前DDR频率

cat /sys/class/devfreq/dmc/cur_freq 

查看频率范围

cat /sys/class/devfreq/dmc/available_frequencies

查看DDR容量

 cat /proc/meminfo

设置固定频率

最大和最小频率设置相同即可，比如设置800M

echo 800000000 > /sys/class/devfreq/dmc/min_freq

设置CPU定频

echo userspace > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
echo 1008000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed
cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies