Enabling second UART in U-Boot.

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I would like to send and receive some data via UART during U-Boot is running and before a kernel is loaded to the RAM. It must be done from U-Boot C code, not from U-Boot commands. I have no idea what I should do. Should I add the second UART to U-Boot device tree source file?  Should I change something in a board configuration file? Do you have any ideas on what steps I should take to achieve my goal? Thank you in advance for any help. 

Last Edited: Fri. Apr 9, 2021 - 06:57 AM