@@ -31,7 +31,7 @@ static __always_inline size_t cmdline_strlcat(char *dest, const char *src, size_
 }
 
 /*
- * This function will append a builtin command line to the command
+ * This function will append or prepend a builtin command line to the command
  * line provided by the bootloader. Kconfig options can be used to alter
  * the behavior of this builtin command line.
  * @dest: The destination of the final appended/prepended string.

@@ -50,6 +50,9 @@ static __always_inline void cmdline_build(char *dest, const char *src, size_t le
 		cmdline_strlcat(dest, CONFIG_CMDLINE, length);
 		return;
 	}
+
+	if (IS_ENABLED(CONFIG_CMDLINE_PREPEND) && sizeof(CONFIG_CMDLINE) > 1)
+		cmdline_strlcat(dest, CONFIG_CMDLINE " ", length);
 #endif
 	if (dest != src)
 		cmdline_strlcat(dest, src, length);