BusyBox 1.30.1 fstrim did not take effect

[Tang Jiye]

Hi,

I am using busybox 1.30.1 and yocto.

I enable the fstrim then I try this command on my machine

everytime I used fstrim -o

it does not do anything.

It only shows me :
BusyBox v1.30.1 (2020-06-02 20:35:41 UTC) multi-call binary.

Usage: fstrim [OPTIONS] MOUNTPOINT

nothing takes effect as well as other commands

Anyone knows how to trouble shoot this issue?
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