Liberation of the Serial Console in the FreeBSD on the Raspberry Pi

Raspberry Pi has UART interface on GPIO pins 14 and 15.
FreeBSD uses it as serial console.
It outputs system messages and provides terminal mode on it.
This is good for first time setup and for debugging.
But if you plan to use this interface for connection to any special device especially in a standalone project, you need to liberate this interface.

Here is a description how to do this.

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