Index: boot/arch/riscv64/src/putchar.c
===================================================================
--- boot/arch/riscv64/src/putchar.c	(revision 5b61171402bf41905f2575034ebd820663168e72)
+++ boot/arch/riscv64/src/putchar.c	(revision fc0b2a8b439bd4294aa93f37af1e7fe305fbee77)
@@ -33,9 +33,9 @@
 #include <arch/ucb.h>
 
-void putchar(const wchar_t ch)
+void putwchar(wchar_t ch)
 {
 	if (ascii_check(ch))
 		htif_cmd(HTIF_DEVICE_CONSOLE, HTIF_CONSOLE_PUTC, ch);
 	else
-		htif_cmd(HTIF_DEVICE_CONSOLE, HTIF_CONSOLE_PUTC, U_SPECIAL);
+		htif_cmd(HTIF_DEVICE_CONSOLE, HTIF_CONSOLE_PUTC, '?');
 }