2023-05-21T16:54:14.5355595Z /opt/riscv64-unknown-elf-toolchain-10.2.0-2020.12.8-x86_64-linux-ubuntu14/bin/../lib/gcc/riscv64-unknown-elf/10.2.0/../../../../riscv64-unknown-elf/bin/ld: build/board/board.o: in function `rt_hw_console_output':
2023-05-21T16:54:14.5356344Z board.c:(.text.rt_hw_console_output+0x0): undefined reference to `my_printf'
2023-05-21T16:54:14.5381715Z collect2: error: ld returned 1 exit status