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When used to read characters from the terminal (e.g., when the SBI console is used via ecall from linux with `console=hvc0`), we must acknowledge receipt of each character to "pop" it off the LiteUART hardware queue, and allow the next character to be made available. Fixes: 52af6e4b ("lib: utils: Add LiteX UART support") Suggested-by: Dolu1990 <charles.papon.90@gmail.com> Signed-off-by: Gabriel Somlo <gsomlo@gmail.com> Reviewed-by: Anup Patel <anup@brainfault.org>