J3板端跑摄像头->yolo->web推流显示，报错：log没有/sys/devices/system/cpu/cpufreq/policy0/cpuinfo_cur_freq文件

J3平台，自己设计的硬件，DDR为MT53D512M32D2DS-046，

编译镜像命令：./build.sh -m micron -f 3200 -i2 -s secure -b j3dvb_emmc

跑摄像头->yolo->web显示的时候，报如下错误：

(vps_module_vapi.cc:406): group_id:0 vio_fps:5

(web_display_plugin.cc:168): open config file /sys/devices/system/cpu/cpufreq/policy0/cpuinfo_cur_freq failed

(runtime_monitor.cpp:66): Smart fps = 5

(web_display_plugin.cc:168): open config file /sys/devices/system/cpu/cpufreq/policy0/cpuinfo_cur_freq failed

(vps_module_vapi.cc:406): group_id:0 vio_fps:5

(web_display_plugin.cc:168): open config file /sys/devices/system/cpu/cpufreq/policy0/cpuinfo_cur_freq failed

查看文件系统里面，确实没有/sys/devices/system/cpu/cpufreq/policy0/cpuinfo_cur_freq这个文件

到/sys/devices/system/cpu/cpufreq/下就没有东西了

另外做了对比，J3 DVB的板端就有/sys/devices/system/cpu/cpufreq/policy0/cpuinfo_cur_freq这个文件，J3 DVB使用的hynix的DDR，编译命令直接是./build.sh

请问这个是为啥呀