Disable ttyS2 console

I need to connect a device to uart. I saw in documents that the only uart is ttyS2.

ttyS2 is connected to the debug console of the ROCK64.

How can I free ttyS2 for my purposes?

The image I used is "stretch-minimal-rock64-0.8.3-1141-arm64.img".

I opened "/boot/extlinux/extlinux.conf" but there isn't reference to tty console to disable.

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