diff --git a/arch/x86/cpu/start.S b/arch/x86/cpu/start.S
index d072825..5b4ee79 100644
--- a/arch/x86/cpu/start.S
+++ b/arch/x86/cpu/start.S
@@ -126,14 +126,9 @@
 	call	board_init_f_mem
 	mov	%eax, %esp
 
-	/*
-	 * Debug UART is available here although it may not be plumbed out
-	 * to pins depending on the board. To use it:
-	 *
-	 * call  debug_uart_init
-	 * mov   $'a', %eax
-	 * call  printch
-	 */
+#ifdef CONFIG_DEBUG_UART
+	call	debug_uart_init
+#endif
 
 	/* Get address of global_data */
 	mov	%fs:0, %edx