How to get cpu l1, l2, l3 cache size on rock3a?

Hello

I tried using command getconf -a | grep CACHE to get cache size, but l1, l2 and l3 cache size are all zero.
04

By the way, dir /sys/devices/system/cpu/cpu0/cache does not exist.

My question is how to get these messages?

My system is debian 10, kernel: Linux 4.19.193-24-rockchip.

THX.