Cleanup for GCC-4.x
diff --git a/board/esd/ocrtc/ocrtc.c b/board/esd/ocrtc/ocrtc.c
index ac032ef..261b8a5 100644
--- a/board/esd/ocrtc/ocrtc.c
+++ b/board/esd/ocrtc/ocrtc.c
@@ -74,7 +74,7 @@
  */
 int checkboard (void)
 {
-	unsigned char str[64];
+	char str[64];
 	int i = getenv_r ("serial#", str, sizeof (str));
 
 	puts ("Board: ");