查看當前DDR頻率
cat /sys/class/devfreq/dmc/cur_freq
查看頻率範圍
cat /sys/class/devfreq/dmc/available_frequencies
查看DDR容量
cat /proc/meminfo
設置固定頻率
最大和最小頻率設置相同即可，比如設置800M
echo 800000000 > /sys/class/devfreq/dmc/min_freq
設置CPU定頻
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
