Support new configuration of TRAB board with more memory

Minor cleanup of comments
diff --git a/lib_arm/board.c b/lib_arm/board.c
index 93deef7..493112d 100644
--- a/lib_arm/board.c
+++ b/lib_arm/board.c
@@ -157,7 +157,7 @@
 /*
  * Breath some life into the board...
  *
- * Initialize an SMC for serial comms, and carry out some hardware
+ * Initialize a serial port as console, and carry out some hardware
  * tests.
  *
  * The first part of initialization is running from Flash memory;