Need to access 4 RockPro64 UARTs via Pins.

[rhex]

Need WiFi, Bluetooth, and UARTs. Don't need GigE.
1. I looked at Google: rk3399.dtsi, and found addresses for uart0 - uart4
2. Used enable_dtoverlay to enable ports
  enable_dtoverlay uart0 'serial@ff180000' okay
  enable_dtoverlay uart1 'serial@ff190000' okay         # Disabled ethernet for this.
#enable_dtoverlay uart2 'serial@ff1a0000' okay         # Already active The only on that works,
  enable_dtoverlay uart3 'serial@ff1b0000' okay
  enable_dtoverlay uart4 'serial@ff370000' okay

Oscilloscope with the following script only show output for ttyS2. (PI bus pins 8,10)
while : ; do echo xx > /dev/ttyS0; echo xx > /dev/ttyS1; echo xx > /dev/ttyS2; echo xx > /dev/ttyS3 ;echo xx > /dev/ttyS4; echo -n . ; sleep 1; done

Looked at the Pine A64 pin assignments,
    0)  uart0  /dev/ttyS0   console
    2)  uart2   /dev/ttyS2   PI bus            pin(8) and pin(10)
    3)  uart3   /dev/ttyS3   Euler bus      pin(24) and pin(23)
    4)  uart4   /dev/ttyS4   Euler bus      pin(19) and  pin(21)
but RockPro64 has no Euler bus. Are all RockPro64 UART pins accessible?