diff --git a/ChangeLog b/ChangeLog
index 7ebfac3144..32e9073fde 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -6374,3 +6374,8 @@
 	  missing interrupt handling logic for UART4-7 (2014-1-6).
 	* nuttx/tools/mkconfig.c: Cast size to unsigned in calculation of
 	  CONFIG_RAM_END to avoid complains about integer overflow (2013-1-6).
+	* nuttx/tools/mkconfig.c: Back out the last change, this causes
+	  problems for assembly language.  How to prevent the integer over-
+	  flow warnings? (2014-1-6).
+	* arch/arm/src/a1x/a1x_serial.c: Handle BUSY interrupt (2014-1-6).
+
diff --git a/arch/arm/src/a1x/a1x_serial.c b/arch/arm/src/a1x/a1x_serial.c
index d821377834..0864fb5518 100644
--- a/arch/arm/src/a1x/a1x_serial.c
+++ b/arch/arm/src/a1x/a1x_serial.c
@@ -1173,12 +1173,17 @@ static int uart_interrupt(struct uart_dev_s *dev)
               break;
             }
 
+          /* Busy detect.  Just ignore.  Cleared by reading the status register */
+
+          case UART_IIR_IID_BUSY:
+              break;
+
           /* Otherwise, there is no (handled) interrupt pending */
 
           case UART_IIR_IID_NONE:
           default:
             {
-              dbg("Unexpected IIR: %02x\n", status);
+              lldbg("Unexpected IIR: %02x\n", status);
               break;
             }
         }
diff --git a/tools/mkconfig.c b/tools/mkconfig.c
index 431a5cdb5a..18d91e7c75 100644
--- a/tools/mkconfig.c
+++ b/tools/mkconfig.c
@@ -182,7 +182,7 @@ int main(int argc, char **argv, char **envp)
   printf(" * of RAM plus the RAM size.\n");
   printf(" */\n\n");
   printf("#ifndef CONFIG_RAM_END\n");
-  printf("# define CONFIG_RAM_END (CONFIG_RAM_START+(unsigned)CONFIG_RAM_SIZE)\n");
+  printf("# define CONFIG_RAM_END (CONFIG_RAM_START+CONFIG_RAM_SIZE)\n");
   printf("#endif\n\n");
   printf("#ifndef CONFIG_RAM_VEND\n");
   printf("# define CONFIG_RAM_VEND (CONFIG_RAM_VSTART+CONFIG_RAM_SIZE)\n");