Can a hexacoptor fly without a Raspberry Pi?

Hello.
We are trying to create a hexacoptor.
In our search for parts, we found Pixhawk RPi CM4 Baseboard.
Raspberry Pi is often bought together.
What is the Raspberry Pi used for?
We want to use the flight controller, Pixhawk 6X.
Is it possible to fly a drone without it?

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It’s a companion computer.

Yes, you can fly without it.

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Thank you so much!!!