diff -r 9c7e8f1918d9 -r 2a084f8943da src/dev/arm/pl011.hh
--- a/src/dev/arm/pl011.hh	Tue Mar 15 16:54:43 2016 +0000
+++ b/src/dev/arm/pl011.hh	Tue Mar 15 16:54:44 2016 +0000
@@ -120,8 +120,10 @@
     static const int UART_DR = 0x000;
     static const int UART_FR = 0x018;
     static const int UART_FR_CTS  = 0x001;
+    static const int UART_FR_RXFE = 0x010;
+    static const int UART_FR_TXFF = 0x020;
+    static const int UART_FR_RXFF = 0x040;
     static const int UART_FR_TXFE = 0x080;
-    static const int UART_FR_RXFE = 0x010;
     static const int UART_IBRD = 0x024;
     static const int UART_FBRD = 0x028;
     static const int UART_LCRH = 0x02C;
diff -r 9c7e8f1918d9 -r 2a084f8943da src/dev/arm/pl011.cc
--- a/src/dev/arm/pl011.cc	Tue Mar 15 16:54:43 2016 +0000
+++ b/src/dev/arm/pl011.cc	Tue Mar 15 16:54:44 2016 +0000
@@ -91,7 +91,8 @@
       case UART_FR:
         data =
             UART_FR_CTS | // Clear To Send
-            (!term->dataAvailable() ? UART_FR_RXFE : 0) | // RX FIFO Empty
+            // Given we do not simulate a FIFO we are either empty or full.
+            (!term->dataAvailable() ? UART_FR_RXFE : UART_FR_RXFF) |
             UART_FR_TXFE; // TX FIFO empty
 
         DPRINTF(Uart,