Cleanup for GCC-4.x
diff --git a/board/esd/plu405/plu405.c b/board/esd/plu405/plu405.c
index e3eff31..16f2360 100644
--- a/board/esd/plu405/plu405.c
+++ b/board/esd/plu405/plu405.c
@@ -203,7 +203,7 @@
  */
 int checkboard (void)
 {
-	unsigned char str[64];
+	char str[64];
 	int i = getenv_r ("serial#", str, sizeof(str));
 
 	puts ("Board: ");