You may set the UART to show its terminals and connect IO pins to them. With Pin_SetDriveMode() you can set the pins to digital High-Z when needed and back to strong mode to transmit data.
in other words, default uart is strong drive high & low (not open drain) right!?
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It is your choice. Strong drive will work without any extern components and is the usual choice.
I have two cpu's on the same uart, even though the protocol takes care of the two not talking at the same time, it's a risk if one drives low and the other high...
Let's say I reconfigure both as open-drain + external ~10k pull-up.
What would be a reasonable max speed ?