Orange Pi Zero dmesg - error?

[Milan Obuch]

Hi,

for some time I see following when booting Orange Pi Zero board using
current 12-CURRENT:

cpulist0: <Open Firmware CPU Group> on ofwbus0
cpu0: <Open Firmware CPU> on cpulist0
cpu0: missing 'clock-frequency' property
random: harvesting attach, 8 bytes (4 bits) from cpu0
cpu1: <Open Firmware CPU> on cpulist0
cpu1: missing 'clock-frequency' property
random: harvesting attach, 8 bytes (4 bits) from cpu1
cpu2: <Open Firmware CPU> on cpulist0
cpu2: missing 'clock-frequency' property
random: harvesting attach, 8 bytes (4 bits) from cpu2
cpu3: <Open Firmware CPU> on cpulist0
cpu3: missing 'clock-frequency' property

I have r327998 at a moment, this can be seen using
sun8i-h2-plus-orangepi-zero.dtb as generated from official sources, no
local modification.

Is it actually an error or just cosmetics? The board itself works just
right, as far as I can tell...

Regards,
Milan