Using multiple UART's on Rock64.
We are using one of the serial interface - UART_2 on the GPIO header pins for console. We wanted to use one more UART to communicate to another device. 

From the pin diagram, there are 2 more UART's available. One set TX-RX on pins 15,18 and another set of TX-RX on pins 33,35.

We are only using EMMC and not using the SD card slot. Is it possible to disable SD card and configure it to be used for the UART.
We are using the Linux kernel from Ayufan - release-4.4.167.

How can we configure to use them appropriately. Is it possible to make the changes using dtb overlay.

Also what's the maximum baudrate that can be achieved on these UART's ? Currently the one used on UART_2 (console) is 1500000. Is this the maximum speed supported ?

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