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This highly depends on your RISC-V system. If you already have a UART you can use that to output data via printf (for example using newlib's system calls). But in most cases is pretty oversized as it requires 100s of kB of memory. I think it would be better to use some kind of "embedded printf" like this from the example provided above and just add the according "putc" function to send one char to your UART.
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