diff --git a/nuttx/ChangeLog b/nuttx/ChangeLog
index af944aeb9..2edeef196 100644
--- a/nuttx/ChangeLog
+++ b/nuttx/ChangeLog
@@ -477,5 +477,6 @@
 	* Complete the basic port of the NXP LPC2148 on the mcu123.com board.
 	  The basic port includes successful booting, serial console and succesfully
 	  passing the examples/ostest.
+	* ARM architectures now support drivers/lowconsole.c
 
 
diff --git a/nuttx/Documentation/NuttX.html b/nuttx/Documentation/NuttX.html
index e93eb5bcb..bc8398e5d 100644
--- a/nuttx/Documentation/NuttX.html
+++ b/nuttx/Documentation/NuttX.html
@@ -8,7 +8,7 @@
   <tr align="center" bgcolor="#e4e4e4">
     <td>
       <h1><big><font color="#3c34ec"><i>NuttX RTOS</i></font></big></h1>
-      <p>Last Updated: September 17, 2008</p>
+      <p>Last Updated: September 18, 2008</p>
     </td>
   </tr>
 </table>
@@ -1111,6 +1111,7 @@ nuttx-0.3.15 2008-xx-xx Gregory Nutt &lt;spudmonkey@racsa.co.cr&gt;
 	* Complete the basic port of the NXP LPC2148 on the mcu123.com board.
 	  The basic port includes successful booting, serial console and succesfully
 	  passing the examples/ostest.
+	* ARM architectures now support drivers/lowconsole.c
 
 pascal-0.1.3 2008-xx-xx Gregory Nutt &lt;spudmonkey@racsa.co.cr&gt;
 
diff --git a/nuttx/arch/arm/src/c5471/c5471_lowputc.S b/nuttx/arch/arm/src/c5471/c5471_lowputc.S
index 78154fd8c..4e949cf35 100644
--- a/nuttx/arch/arm/src/c5471/c5471_lowputc.S
+++ b/nuttx/arch/arm/src/c5471/c5471_lowputc.S
@@ -1,7 +1,7 @@
 /**************************************************************************
  * c5471/c5471_lowputc.S
  *
- *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -14,7 +14,7 @@
  *    notice, this list of conditions and the following disclaimer in
  *    the documentation and/or other materials provided with the
  *    distribution.
- * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ * 3. Neither the name NuttX nor the names of its contributors may be
  *    used to endorse or promote products derived from this software
  *    without specific prior written permission.
  *
diff --git a/nuttx/arch/arm/src/common/up_head.S b/nuttx/arch/arm/src/common/up_head.S
index e6afed640..019872f4d 100644
--- a/nuttx/arch/arm/src/common/up_head.S
+++ b/nuttx/arch/arm/src/common/up_head.S
@@ -284,7 +284,7 @@ __start:
 #endif
 	/* Perform early serial initialization */
 
-#if defined(CONFIG_DEV_CONSOLE) && CONFIG_NFILE_DESCRIPTORS > 0
+#ifdef CONFIG_USE_EARLYSERIALINIT
 	bl      up_earlyserialinit
 #endif
 
diff --git a/nuttx/arch/arm/src/common/up_initialize.c b/nuttx/arch/arm/src/common/up_initialize.c
index 583142ec0..e5b612fc6 100644
--- a/nuttx/arch/arm/src/common/up_initialize.c
+++ b/nuttx/arch/arm/src/common/up_initialize.c
@@ -135,7 +135,11 @@ void up_initialize(void)
 
   /* Initialize the serial device driver */
 
+#ifdef CONFIG_USE_SERIALDRIVER
   up_serialinit();
+#elif defined(CONFIG_DEV_LOWCONSOLE)
+  lowconsole_init();
+#endif
 
   /* Initialize the netwok */
 
diff --git a/nuttx/arch/arm/src/common/up_internal.h b/nuttx/arch/arm/src/common/up_internal.h
index 182e6058c..836a2579f 100644
--- a/nuttx/arch/arm/src/common/up_internal.h
+++ b/nuttx/arch/arm/src/common/up_internal.h
@@ -55,6 +55,16 @@
 #undef  CONFIG_SUPPRESS_UART_CONFIG   /* DEFINED: Do not reconfig UART */
 #undef  CONFIG_DUMP_ON_EXIT           /* DEFINED: Dump task state on exit */
 
+/* Determine which (if any) console driver to use */
+
+#if CONFIG_NFILE_DESCRIPTORS == 0 || defined(CONFIG_DEV_LOWCONSOLE)
+#  undef CONFIG_USE_SERIALDRIVER
+#  undef CONFIG_USE_EARLYSERIALINIT
+#elif defined(CONFIG_DEV_CONSOLE) && CONFIG_NFILE_DESCRIPTORS > 0
+#  define CONFIG_USE_SERIALDRIVER 1
+#  define CONFIG_USE_EARLYSERIALINIT 1
+#endif
+
 /****************************************************************************
  * Public Types
  ****************************************************************************/
@@ -88,7 +98,6 @@ extern uint32 g_heapbase;
  * Inline Functions
  ****************************************************************************/
 
-
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
@@ -110,12 +119,7 @@ extern void up_sigdeliver(void);
 extern void up_syscall(uint32 *regs);
 extern int  up_timerisr(int irq, uint32 *regs);
 extern void up_undefinedinsn(uint32 *regs);
-
-#ifdef CONFIG_DEBUG
 extern void up_lowputc(char ch);
-#else
-# define up_lowputc(ch)
-#endif
 
 /* Defined in up_vectors.S */
 
@@ -137,6 +141,14 @@ extern void up_serialinit(void);
 # define up_serialinit()
 #endif
 
+/* Defined in drivers/lowconsole.c */
+
+#ifdef CONFIG_DEV_LOWCONSOLE
+extern void lowconsole_init(void);
+#else
+# define lowconsole_init()
+#endif
+
 /* Defined in up_watchdog.c */
 
 extern void up_wdtinit(void);
diff --git a/nuttx/arch/arm/src/common/up_nommuhead.S b/nuttx/arch/arm/src/common/up_nommuhead.S
index 581ed0a6d..318afb186 100644
--- a/nuttx/arch/arm/src/common/up_nommuhead.S
+++ b/nuttx/arch/arm/src/common/up_nommuhead.S
@@ -105,10 +105,10 @@ __start:
 
 #endif
 
-#if defined(CONFIG_DEV_CONSOLE) && CONFIG_NFILE_DESCRIPTORS >0
 	/* Perform early serial initialization */
 
 	mov	fp, #0
+#ifdef CONFIG_USE_EARLYSERIALINIT
 	bl	up_earlyserialinit
 #endif
 
diff --git a/nuttx/arch/arm/src/dm320/dm320_lowputc.S b/nuttx/arch/arm/src/dm320/dm320_lowputc.S
index 5566b3f58..53c9912bf 100644
--- a/nuttx/arch/arm/src/dm320/dm320_lowputc.S
+++ b/nuttx/arch/arm/src/dm320/dm320_lowputc.S
@@ -1,7 +1,7 @@
 /**************************************************************************
  * dm320/dm320_lowputc.S
  *
- *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -14,7 +14,7 @@
  *    notice, this list of conditions and the following disclaimer in
  *    the documentation and/or other materials provided with the
  *    distribution.
- * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ * 3. Neither the name NuttX nor the names of its contributors may be
  *    used to endorse or promote products derived from this software
  *    without specific prior written permission.
  *
diff --git a/nuttx/arch/arm/src/dm320/dm320_serial.c b/nuttx/arch/arm/src/dm320/dm320_serial.c
index 7018f7b41..479c271bb 100644
--- a/nuttx/arch/arm/src/dm320/dm320_serial.c
+++ b/nuttx/arch/arm/src/dm320/dm320_serial.c
@@ -55,7 +55,7 @@
 #include "os_internal.h"
 #include "up_internal.h"
 
-#if CONFIG_NFILE_DESCRIPTORS > 0
+#ifdef CONFIG_USE_SERIALDRIVER
 
 /****************************************************************************
  * Definitions
@@ -780,7 +780,7 @@ int up_putc(int ch)
   return ch;
 }
 
-#else /* CONFIG_NFILE_DESCRIPTORS > 0 */
+#else /* CONFIG_USE_SERIALDRIVER */
 
 /****************************************************************************
  * Definitions
@@ -833,6 +833,6 @@ int up_putc(int ch)
   return ch;
 }
 
-#endif /* CONFIG_NFILE_DESCRIPTORS > 0 */
+#endif /* CONFIG_USE_SERIALDRIVER */
 
 
diff --git a/nuttx/arch/arm/src/lpc214x/lpc214x_head.S b/nuttx/arch/arm/src/lpc214x/lpc214x_head.S
index 117ca6a1f..6b5c24e17 100644
--- a/nuttx/arch/arm/src/lpc214x/lpc214x_head.S
+++ b/nuttx/arch/arm/src/lpc214x/lpc214x_head.S
@@ -477,7 +477,9 @@ __start:
 	/* Perform early serial initialization */
 
 	mov	fp, #0
+#ifdef CONFIG_USE_EARLYSERIALINIT
 	bl	up_earlyserialinit
+#endif
 
 	showprogress 'C'
 	showprogress '\n'
diff --git a/nuttx/arch/arm/src/lpc214x/lpc214x_serial.c b/nuttx/arch/arm/src/lpc214x/lpc214x_serial.c
index dc8a4accb..746899b96 100644
--- a/nuttx/arch/arm/src/lpc214x/lpc214x_serial.c
+++ b/nuttx/arch/arm/src/lpc214x/lpc214x_serial.c
@@ -1,5 +1,5 @@
 /****************************************************************************
- * lpc214x/lpc214x_serial.c
+ * arch/arm/src/lpc214x/lpc214x_serial.c
  *
  *   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
@@ -55,11 +55,13 @@
 
 #include "lpc214x_uart.h"
 
+#ifdef CONFIG_USE_SERIALDRIVER
+
 /****************************************************************************
  * Definitions
  ****************************************************************************/
 
-#define BASE_BAUD 115200
+#define BASE_BAUD 38400
 
 /****************************************************************************
  * Private Types
@@ -458,9 +460,9 @@ static int up_interrupt(int irq, void *context)
        */
 
        status  = up_serialin(priv, LPC214X_UART_IIR_OFFSET);
-      
+
       /* The NO INTERRUPT should be zero */
-      
+
       if (status  !=  LPC214X_IIR_NO_INT)
         {
           /* Handline incoming, receive bytes (with or without timeout) */
@@ -478,20 +480,20 @@ static int up_interrupt(int irq, void *context)
             }
 
           /* Just clear modem status interrupts */
-        
+
           else if (status == LPC214X_IIR_MS_INT)
            {
              /* Read the modem status regisgter (MSR) to clear */
-            
+
              (void)up_serialin(priv, LPC214X_UART_MSR_OFFSET);
            }
 
           /* Just clear any line status interrupts */
-        
+
           else if (status == LPC214X_IIR_RLS_INT)
             {
               /* Read the line status register (LSR) to clear */
-            
+
               (void)up_serialin(priv, LPC214X_UART_LSR_OFFSET);
             }
         }
@@ -698,19 +700,19 @@ static boolean up_txempty(struct uart_dev_s *dev)
 void up_earlyserialinit(void)
 {
   /* Enable UART0 and 1 */
-  
+
   uint32 pinsel = getreg32(LPC214X_PINSEL0);
   pinsel &= ~(LPC214X_UART0_PINMASK|LPC214X_UART1_PINMASK);
   pinsel |= (LPC214X_UART0_PINSEL|LPC214X_UART1_PINSEL);
   putreg32(pinsel, LPC214X_PINSEL0);
 
   /* Disable both UARTS */
-  
+
   up_disableuartint(TTYS0_DEV.priv, NULL);
   up_disableuartint(TTYS1_DEV.priv, NULL);
 
   /* Configuration whichever on is the console */
-  
+
   CONSOLE_DEV.isconsole = TRUE;
   up_setup(&CONSOLE_DEV);
 }
@@ -735,8 +737,7 @@ void up_serialinit(void)
  * Name: up_putc
  *
  * Description:
- *   Provide priority, low-level access to support OS debug
- *   writes
+ *   Provide priority, low-level access to support OS debug  writes
  *
  ****************************************************************************/
 
@@ -764,3 +765,29 @@ int up_putc(int ch)
   return ch;
 }
 
+#else /* CONFIG_USE_SERIALDRIVER */
+
+/****************************************************************************
+ * Name: up_putc
+ *
+ * Description:
+ *   Provide priority, low-level access to support OS debug writes
+ *
+ ****************************************************************************/
+
+int up_putc(int ch)
+{
+  /* Check for LF */
+
+  if (ch == '\n')
+    {
+      /* Add CR */
+
+      up_lowputc('\r');
+    }
+
+  up_lowputc(ch);
+  return ch;
+}
+
+#endif /* CONFIG_USE_SERIALDRIVER */
diff --git a/nuttx/arch/z80/src/common/up_internal.h b/nuttx/arch/z80/src/common/up_internal.h
index ec3f6b811..3c60495cc 100644
--- a/nuttx/arch/z80/src/common/up_internal.h
+++ b/nuttx/arch/z80/src/common/up_internal.h
@@ -63,7 +63,7 @@
  * Definitions
  ****************************************************************************/
 
- /* Determine which (if any) console driver to use */
+/* Determine which (if any) console driver to use */
 
 #if CONFIG_NFILE_DESCRIPTORS == 0 || defined(CONFIG_DEV_LOWCONSOLE)
 #  undef CONFIG_USE_SERIALDRIVER
diff --git a/nuttx/configs/c5471evm/defconfig b/nuttx/configs/c5471evm/defconfig
index eeeb61a9b..626e7fc8b 100644
--- a/nuttx/configs/c5471evm/defconfig
+++ b/nuttx/configs/c5471evm/defconfig
@@ -145,6 +145,8 @@ CONFIG_HAVE_LIBM=n
 # CONFIG_JULIAN_TIME - Enables Julian time conversions
 # CONFIG_DEV_CONSOLE - Set if architecture-specific logic
 #   provides /dev/console.  Enables stdout, stderr, stdin.
+# CONFIG_DEV_LOWCONSOLE - Use the simple, low-level serial console
+#   driver (minimul support)
 #
 CONFIG_EXAMPLE=ostest
 CONFIG_DEBUG=n
@@ -159,6 +161,7 @@ CONFIG_START_MONTH=2
 CONFIG_START_DAY=13
 CONFIG_JULIAN_TIME=n
 CONFIG_DEV_CONSOLE=y
+CONFIG_DEV_LOWCONSOLE=n
 
 #
 # The following can be used to disable categories of
diff --git a/nuttx/configs/c5471evm/dhcpconfig b/nuttx/configs/c5471evm/dhcpconfig
index b78b87eb8..cbcea2f62 100644
--- a/nuttx/configs/c5471evm/dhcpconfig
+++ b/nuttx/configs/c5471evm/dhcpconfig
@@ -145,6 +145,8 @@ CONFIG_HAVE_LIBM=n
 # CONFIG_JULIAN_TIME - Enables Julian time conversions
 # CONFIG_DEV_CONSOLE - Set if architecture-specific logic
 #   provides /dev/console.  Enables stdout, stderr, stdin.
+# CONFIG_DEV_LOWCONSOLE - Use the simple, low-level serial console
+#   driver (minimul support)
 #
 CONFIG_EXAMPLE=uip
 CONFIG_DEBUG=n
@@ -159,6 +161,7 @@ CONFIG_START_MONTH=2
 CONFIG_START_DAY=13
 CONFIG_JULIAN_TIME=n
 CONFIG_DEV_CONSOLE=y
+CONFIG_DEV_LOWCONSOLE=n
 
 #
 # The following can be used to disable categories of
diff --git a/nuttx/configs/c5471evm/netconfig b/nuttx/configs/c5471evm/netconfig
index 713467dd4..109cd7279 100644
--- a/nuttx/configs/c5471evm/netconfig
+++ b/nuttx/configs/c5471evm/netconfig
@@ -145,6 +145,8 @@ CONFIG_UART_MODEM_2STOP=0
 # CONFIG_JULIAN_TIME - Enables Julian time conversions
 # CONFIG_DEV_CONSOLE - Set if architecture-specific logic
 #   provides /dev/console.  Enables stdout, stderr, stdin.
+# CONFIG_DEV_LOWCONSOLE - Use the simple, low-level serial console
+#   driver (minimul support)
 #
 CONFIG_EXAMPLE=nettest
 CONFIG_DEBUG=n
@@ -159,6 +161,7 @@ CONFIG_START_MONTH=2
 CONFIG_START_DAY=13
 CONFIG_JULIAN_TIME=n
 CONFIG_DEV_CONSOLE=y
+CONFIG_DEV_LOWCONSOLE=n
 
 #
 # The following can be used to disable categories of
diff --git a/nuttx/configs/c5471evm/nshconfig b/nuttx/configs/c5471evm/nshconfig
index fef337dc0..206438f17 100644
--- a/nuttx/configs/c5471evm/nshconfig
+++ b/nuttx/configs/c5471evm/nshconfig
@@ -145,6 +145,8 @@ CONFIG_HAVE_LIBM=n
 # CONFIG_JULIAN_TIME - Enables Julian time conversions
 # CONFIG_DEV_CONSOLE - Set if architecture-specific logic
 #   provides /dev/console.  Enables stdout, stderr, stdin.
+# CONFIG_DEV_LOWCONSOLE - Use the simple, low-level serial console
+#   driver (minimul support)
 #
 CONFIG_EXAMPLE=nsh
 CONFIG_DEBUG=n
@@ -159,6 +161,7 @@ CONFIG_START_MONTH=2
 CONFIG_START_DAY=13
 CONFIG_JULIAN_TIME=n
 CONFIG_DEV_CONSOLE=y
+CONFIG_DEV_LOWCONSOLE=n
 
 #
 # The following can be used to disable categories of
diff --git a/nuttx/configs/m68332evb/defconfig b/nuttx/configs/m68332evb/defconfig
index 0df6da5d9..227677ba0 100644
--- a/nuttx/configs/m68332evb/defconfig
+++ b/nuttx/configs/m68332evb/defconfig
@@ -134,6 +134,8 @@ CONFIG_HAVE_LIBM=n
 # CONFIG_JULIAN_TIME - Enables Julian time conversions
 # CONFIG_DEV_CONSOLE - Set if architecture-specific logic
 #   provides /dev/console.  Enables stdout, stderr, stdin.
+# CONFIG_DEV_LOWCONSOLE - Use the simple, low-level serial console
+#   driver (minimul support)
 #
 CONFIG_EXAMPLE=ostest
 CONFIG_DEBUG=n
@@ -148,6 +150,7 @@ CONFIG_START_MONTH=2
 CONFIG_START_DAY=13
 CONFIG_JULIAN_TIME=n
 CONFIG_DEV_CONSOLE=y
+CONFIG_DEV_LOWCONSOLE=n
 
 #
 # The following can be used to disable categories of
diff --git a/nuttx/configs/mcu123-lpc214x/ostest/defconfig b/nuttx/configs/mcu123-lpc214x/ostest/defconfig
index 9d1567d3d..a0bd930fa 100644
--- a/nuttx/configs/mcu123-lpc214x/ostest/defconfig
+++ b/nuttx/configs/mcu123-lpc214x/ostest/defconfig
@@ -1,5 +1,5 @@
 ############################################################################
-# configs/mcu123-lpc214x/defconfig
+# configs/mcu123-lpc214x/ostest/defconfig
 #
 #   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
 #   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
@@ -33,7 +33,7 @@
 #
 ############################################################################
 #
-# architecture selection
+# Architecture selection
 #
 # CONFIG_ARCH - identifies the arch subdirectory and, hence, the
 #   processor architecture.
@@ -158,13 +158,15 @@ CONFIG_HAVE_LIBM=n
 # CONFIG_JULIAN_TIME - Enables Julian time conversions
 # CONFIG_DEV_CONSOLE - Set if architecture-specific logic
 #   provides /dev/console.  Enables stdout, stderr, stdin.
+# CONFIG_DEV_LOWCONSOLE - Use the simple, low-level serial console
+#   driver (minimul support)
 #
 CONFIG_EXAMPLE=ostest
 CONFIG_DEBUG=n
 CONFIG_DEBUG_VERBOSE=n
 CONFIG_MM_REGIONS=1
 CONFIG_ARCH_LOWPUTC=y
-CONFIG_RR_INTERVAL=200
+CONFIG_RR_INTERVAL=0
 CONFIG_SCHED_INSTRUMENTATION=n
 CONFIG_TASK_NAME_SIZE=0
 CONFIG_START_YEAR=2008
@@ -172,6 +174,7 @@ CONFIG_START_MONTH=9
 CONFIG_START_DAY=17
 CONFIG_JULIAN_TIME=n
 CONFIG_DEV_CONSOLE=y
+CONFIG_DEV_LOWCONSOLE=y
 
 #
 # The following can be used to disable categories of
@@ -264,12 +267,12 @@ CONFIG_NPTHREAD_KEYS=4
 CONFIG_NFILE_DESCRIPTORS=8
 CONFIG_NFILE_STREAMS=8
 CONFIG_NAME_MAX=32
-CONFIG_STDIO_BUFFER_SIZE=512
+CONFIG_STDIO_BUFFER_SIZE=256
 CONFIG_NUNGET_CHARS=2
-CONFIG_PREALLOC_MQ_MSGS=8
+CONFIG_PREALLOC_MQ_MSGS=4
 CONFIG_MQ_MAXMSGSIZE=32
-CONFIG_MAX_WDOGPARMS=4
-CONFIG_PREALLOC_WDOGS=8
+CONFIG_MAX_WDOGPARMS=2
+CONFIG_PREALLOC_WDOGS=4
 CONFIG_PREALLOC_TIMERS=4
 
 #
@@ -324,6 +327,11 @@ CONFIG_NET_BROADCAST=n
 CONFIG_NET_DHCP_LIGHT=n
 CONFIG_NET_RESOLV_ENTRIES=4
 
+#
+# Settings for examples/ostest
+CONFIG_EXAMPLES_OSTEST_LOOPS=1
+CONFIG_EXAMPLES_OSTEST_STACKSIZE=512
+
 #
 # Settings for examples/nsh
 CONFIG_EXAMPLES_NSH_CONSOLE=y
@@ -354,8 +362,8 @@ CONFIG_EXAMPLES_NSH_NETMASK=(255<<24|255<<16|255<<8|0)
 CONFIG_BOOT_FROM_FLASH=y
 CONFIG_CUSTOM_STACK=n
 CONFIG_STACK_POINTER=
-CONFIG_PROC_STACK_SIZE=1024
+CONFIG_PROC_STACK_SIZE=512
 CONFIG_PTHREAD_STACK_MIN=256
-CONFIG_PTHREAD_STACK_DEFAULT=1024
+CONFIG_PTHREAD_STACK_DEFAULT=512
 CONFIG_HEAP_BASE=
 CONFIG_HEAP_SIZE=
diff --git a/nuttx/configs/ntosd-dm320/nettest/defconfig b/nuttx/configs/ntosd-dm320/nettest/defconfig
index 6bba44f69..be3ca6d24 100644
--- a/nuttx/configs/ntosd-dm320/nettest/defconfig
+++ b/nuttx/configs/ntosd-dm320/nettest/defconfig
@@ -143,6 +143,8 @@ CONFIG_HAVE_LIBM=n
 # CONFIG_JULIAN_TIME - Enables Julian time conversions
 # CONFIG_DEV_CONSOLE - Set if architecture-specific logic
 #   provides /dev/console.  Enables stdout, stderr, stdin.
+# CONFIG_DEV_LOWCONSOLE - Use the simple, low-level serial console
+#   driver (minimul support)
 #
 CONFIG_EXAMPLE=nettest
 CONFIG_DEBUG=n
@@ -157,6 +159,7 @@ CONFIG_START_MONTH=8
 CONFIG_START_DAY=29
 CONFIG_JULIAN_TIME=n
 CONFIG_DEV_CONSOLE=y
+CONFIG_DEV_LOWCONSOLE=n
 
 #
 # The following can be used to disable categories of
diff --git a/nuttx/configs/ntosd-dm320/nsh/defconfig b/nuttx/configs/ntosd-dm320/nsh/defconfig
index c9bc5d208..d10fafeb2 100644
--- a/nuttx/configs/ntosd-dm320/nsh/defconfig
+++ b/nuttx/configs/ntosd-dm320/nsh/defconfig
@@ -143,6 +143,8 @@ CONFIG_HAVE_LIBM=n
 # CONFIG_JULIAN_TIME - Enables Julian time conversions
 # CONFIG_DEV_CONSOLE - Set if architecture-specific logic
 #   provides /dev/console.  Enables stdout, stderr, stdin.
+# CONFIG_DEV_LOWCONSOLE - Use the simple, low-level serial console
+#   driver (minimul support)
 #
 CONFIG_EXAMPLE=nsh
 CONFIG_DEBUG=n
@@ -157,6 +159,7 @@ CONFIG_START_MONTH=9
 CONFIG_START_DAY=12
 CONFIG_JULIAN_TIME=n
 CONFIG_DEV_CONSOLE=y
+CONFIG_DEV_LOWCONSOLE=n
 
 #
 # The following can be used to disable categories of
diff --git a/nuttx/configs/ntosd-dm320/ostest/defconfig b/nuttx/configs/ntosd-dm320/ostest/defconfig
index 1b0018040..3e4c44c6f 100644
--- a/nuttx/configs/ntosd-dm320/ostest/defconfig
+++ b/nuttx/configs/ntosd-dm320/ostest/defconfig
@@ -143,6 +143,8 @@ CONFIG_HAVE_LIBM=n
 # CONFIG_JULIAN_TIME - Enables Julian time conversions
 # CONFIG_DEV_CONSOLE - Set if architecture-specific logic
 #   provides /dev/console.  Enables stdout, stderr, stdin.
+# CONFIG_DEV_LOWCONSOLE - Use the simple, low-level serial console
+#   driver (minimul support)
 #
 CONFIG_EXAMPLE=ostest
 CONFIG_DEBUG=n
@@ -157,6 +159,7 @@ CONFIG_START_MONTH=8
 CONFIG_START_DAY=29
 CONFIG_JULIAN_TIME=n
 CONFIG_DEV_CONSOLE=y
+CONFIG_DEV_LOWCONSOLE=n
 
 #
 # The following can be used to disable categories of
diff --git a/nuttx/configs/ntosd-dm320/udp/defconfig b/nuttx/configs/ntosd-dm320/udp/defconfig
index b07a48092..d0ec81a7d 100644
--- a/nuttx/configs/ntosd-dm320/udp/defconfig
+++ b/nuttx/configs/ntosd-dm320/udp/defconfig
@@ -143,6 +143,8 @@ CONFIG_HAVE_LIBM=n
 # CONFIG_JULIAN_TIME - Enables Julian time conversions
 # CONFIG_DEV_CONSOLE - Set if architecture-specific logic
 #   provides /dev/console.  Enables stdout, stderr, stdin.
+# CONFIG_DEV_LOWCONSOLE - Use the simple, low-level serial console
+#   driver (minimul support)
 #
 CONFIG_EXAMPLE=udp
 CONFIG_DEBUG=n
@@ -157,6 +159,7 @@ CONFIG_START_MONTH=8
 CONFIG_START_DAY=29
 CONFIG_JULIAN_TIME=n
 CONFIG_DEV_CONSOLE=y
+CONFIG_DEV_LOWCONSOLE=n
 
 #
 # The following can be used to disable categories of
diff --git a/nuttx/configs/ntosd-dm320/uip/defconfig b/nuttx/configs/ntosd-dm320/uip/defconfig
index 52a59a515..d463ab1a9 100644
--- a/nuttx/configs/ntosd-dm320/uip/defconfig
+++ b/nuttx/configs/ntosd-dm320/uip/defconfig
@@ -143,6 +143,8 @@ CONFIG_HAVE_LIBM=n
 # CONFIG_JULIAN_TIME - Enables Julian time conversions
 # CONFIG_DEV_CONSOLE - Set if architecture-specific logic
 #   provides /dev/console.  Enables stdout, stderr, stdin.
+# CONFIG_DEV_LOWCONSOLE - Use the simple, low-level serial console
+#   driver (minimul support)
 #
 CONFIG_EXAMPLE=uip
 CONFIG_DEBUG=n
@@ -157,6 +159,7 @@ CONFIG_START_MONTH=8
 CONFIG_START_DAY=29
 CONFIG_JULIAN_TIME=n
 CONFIG_DEV_CONSOLE=n
+CONFIG_DEV_LOWCONSOLE=n
 
 #
 # The following can be used to disable categories of
diff --git a/nuttx/configs/pjrc-8051/defconfig b/nuttx/configs/pjrc-8051/defconfig
index 920eb96f8..280f61239 100644
--- a/nuttx/configs/pjrc-8051/defconfig
+++ b/nuttx/configs/pjrc-8051/defconfig
@@ -131,6 +131,8 @@ CONFIG_HAVE_LIBM=n
 #   Used to initialize the internal time logic.
 # CONFIG_DEV_CONSOLE - Set if architecture-specific logic
 #   provides /dev/console.  Enables stdout, stderr, stdin.
+# CONFIG_DEV_LOWCONSOLE - Use the simple, low-level serial console
+#   driver (minimul support)
 #
 CONFIG_EXAMPLE=ostest
 CONFIG_DEBUG=n
@@ -145,6 +147,7 @@ CONFIG_START_MONTH=2
 CONFIG_START_DAY=21
 CONFIG_JULIAN_TIME=n
 CONFIG_DEV_CONSOLE=n
+CONFIG_DEV_LOWCONSOLE=n
 
 #
 # The following can be used to disable categories of
diff --git a/nuttx/configs/sim/mount/defconfig b/nuttx/configs/sim/mount/defconfig
index fd576979b..1ebb03bfc 100644
--- a/nuttx/configs/sim/mount/defconfig
+++ b/nuttx/configs/sim/mount/defconfig
@@ -80,6 +80,8 @@ CONFIG_ARCH_BOARD_SIM=y
 #   Used to initialize the internal time logic.
 # CONFIG_DEV_CONSOLE - Set if architecture-specific logic
 #   provides /dev/console.  Enables stdout, stderr, stdin.
+# CONFIG_DEV_LOWCONSOLE - Use the simple, low-level serial console
+#   driver (minimul support)
 #
 CONFIG_EXAMPLE=mount
 CONFIG_DEBUG=y
@@ -94,6 +96,7 @@ CONFIG_START_MONTH=6
 CONFIG_START_DAY=1
 CONFIG_JULIAN_TIME=n
 CONFIG_DEV_CONSOLE=y
+CONFIG_DEV_LOWCONSOLE=n
 
 #
 # The following can be used to disable categories of
diff --git a/nuttx/configs/sim/nettest/defconfig b/nuttx/configs/sim/nettest/defconfig
index bf918b2b2..df04db1ed 100644
--- a/nuttx/configs/sim/nettest/defconfig
+++ b/nuttx/configs/sim/nettest/defconfig
@@ -80,6 +80,8 @@ CONFIG_ARCH_BOARD_SIM=y
 #   Used to initialize the internal time logic.
 # CONFIG_DEV_CONSOLE - Set if architecture-specific logic
 #   provides /dev/console.  Enables stdout, stderr, stdin.
+# CONFIG_DEV_LOWCONSOLE - Use the simple, low-level serial console
+#   driver (minimul support)
 #
 CONFIG_EXAMPLE=nettest
 CONFIG_DEBUG=n
@@ -94,6 +96,7 @@ CONFIG_START_MONTH=8
 CONFIG_START_DAY=16
 CONFIG_JULIAN_TIME=n
 CONFIG_DEV_CONSOLE=y
+CONFIG_DEV_LOWCONSOLE=n
 
 #
 # The following can be used to disable categories of
diff --git a/nuttx/configs/sim/nsh/defconfig b/nuttx/configs/sim/nsh/defconfig
index 828788895..6cc39f2b2 100644
--- a/nuttx/configs/sim/nsh/defconfig
+++ b/nuttx/configs/sim/nsh/defconfig
@@ -80,6 +80,8 @@ CONFIG_ARCH_BOARD_SIM=y
 #   Used to initialize the internal time logic.
 # CONFIG_DEV_CONSOLE - Set if architecture-specific logic
 #   provides /dev/console.  Enables stdout, stderr, stdin.
+# CONFIG_DEV_LOWCONSOLE - Use the simple, low-level serial console
+#   driver (minimul support)
 #
 CONFIG_EXAMPLE=nsh
 CONFIG_DEBUG=y
@@ -94,6 +96,7 @@ CONFIG_START_MONTH=6
 CONFIG_START_DAY=1
 CONFIG_JULIAN_TIME=n
 CONFIG_DEV_CONSOLE=y
+CONFIG_DEV_LOWCONSOLE=n
 
 #
 # The following can be used to disable categories of
diff --git a/nuttx/configs/sim/ostest/defconfig b/nuttx/configs/sim/ostest/defconfig
index a00dd1126..577b762a5 100644
--- a/nuttx/configs/sim/ostest/defconfig
+++ b/nuttx/configs/sim/ostest/defconfig
@@ -80,6 +80,8 @@ CONFIG_ARCH_BOARD_SIM=y
 #   Used to initialize the internal time logic.
 # CONFIG_DEV_CONSOLE - Set if architecture-specific logic
 #   provides /dev/console.  Enables stdout, stderr, stdin.
+# CONFIG_DEV_LOWCONSOLE - Use the simple, low-level serial console
+#   driver (minimul support)
 #
 CONFIG_EXAMPLE=ostest
 CONFIG_DEBUG=y
@@ -94,6 +96,7 @@ CONFIG_START_MONTH=2
 CONFIG_START_DAY=27
 CONFIG_JULIAN_TIME=n
 CONFIG_DEV_CONSOLE=y
+CONFIG_DEV_LOWCONSOLE=n
 CONFIG_MUTEX_TYPES=y
 
 #
diff --git a/nuttx/configs/sim/pashello/defconfig b/nuttx/configs/sim/pashello/defconfig
index bfddb43c3..a75275f6a 100644
--- a/nuttx/configs/sim/pashello/defconfig
+++ b/nuttx/configs/sim/pashello/defconfig
@@ -80,6 +80,8 @@ CONFIG_ARCH_BOARD_SIM=y
 #   Used to initialize the internal time logic.
 # CONFIG_DEV_CONSOLE - Set if architecture-specific logic
 #   provides /dev/console.  Enables stdout, stderr, stdin.
+# CONFIG_DEV_LOWCONSOLE - Use the simple, low-level serial console
+#   driver (minimul support)
 #
 CONFIG_EXAMPLE=pashello
 CONFIG_DEBUG=n
@@ -94,6 +96,7 @@ CONFIG_START_MONTH=2
 CONFIG_START_DAY=27
 CONFIG_JULIAN_TIME=n
 CONFIG_DEV_CONSOLE=y
+CONFIG_DEV_LOWCONSOLE=n
 
 #
 # The following can be used to disable categories of
diff --git a/nuttx/configs/z80sim/pashello/defconfig b/nuttx/configs/z80sim/pashello/defconfig
index 8dea30eab..e091eb1d5 100644
--- a/nuttx/configs/z80sim/pashello/defconfig
+++ b/nuttx/configs/z80sim/pashello/defconfig
@@ -131,9 +131,8 @@ CONFIG_START_YEAR=2007
 CONFIG_START_MONTH=2
 CONFIG_START_DAY=21
 CONFIG_JULIAN_TIME=n
-CONFIG_DEV_CONSOLE=y
 CONFIG_HAVE_LOWUARTINIT=n
-CONFIG_DEV_LOWCONSOLE=y
+CONFIG_DEV_CONSOLE=y
 CONFIG_DEV_LOWCONSOLE=n
 
 #
diff --git a/nuttx/drivers/lowconsole.c b/nuttx/drivers/lowconsole.c
index d627d4d87..0dcfe72b3 100755
--- a/nuttx/drivers/lowconsole.c
+++ b/nuttx/drivers/lowconsole.c
@@ -50,6 +50,12 @@
  * Definitions
  ****************************************************************************/
 
+/* The architecture must provide up_putc for this driver */
+
+#ifndef CONFIG_ARCH_LOWPUTC
+#  error "Architecture must provide up_putc() for this driver"
+#endif
+
 /****************************************************************************
  * Private Function Prototypes
  ****************************************************************************/
diff --git a/nuttx/drivers/serial.c b/nuttx/drivers/serial.c
index 9f26632ee..eb71f0c2c 100644
--- a/nuttx/drivers/serial.c
+++ b/nuttx/drivers/serial.c
@@ -53,12 +53,14 @@
  * Definitions
  ************************************************************************************/
 
-#ifdef CONFIG_HAVE_LOWPUTC
-# define uart_putc(ch) up_lowputc(ch);
-#else
-# define uart_putc(ch) up_putc(ch);
+/* The architecture must provide up_putc for this driver */
+
+#ifndef CONFIG_ARCH_LOWPUTC
+#  error "Architecture must provide up_putc() for this driver"
 #endif
 
+#define uart_putc(ch) up_putc(ch)
+
 /************************************************************************************
  * Private Types
  ************************************************************************************/
diff --git a/nuttx/examples/ostest/Makefile b/nuttx/examples/ostest/Makefile
index 3eeda4f08..adb875932 100644
--- a/nuttx/examples/ostest/Makefile
+++ b/nuttx/examples/ostest/Makefile
@@ -40,7 +40,10 @@ ASRCS	=
 AOBJS	= $(ASRCS:.S=$(OBJEXT))
 CSRCS	= main.c dev_null.c
 ifneq ($(CONFIG_DISABLE_PTHREAD),y)
-CSRCS	+= cancel.c cond.c mutex.c sem.c roundrobin.c barrier.c
+CSRCS	+= cancel.c cond.c mutex.c sem.c barrier.c
+ifneq ($(CONFIG_RR_INTERVAL),0)
+CSRCS	+= roundrobin.c
+endif
 ifeq ($(CONFIG_MUTEX_TYPES),y)
 CSRCS   += rmutex.c
 endif
diff --git a/nuttx/examples/ostest/roundrobin.c b/nuttx/examples/ostest/roundrobin.c
index 003c6cf6b..061d51f3d 100644
--- a/nuttx/examples/ostest/roundrobin.c
+++ b/nuttx/examples/ostest/roundrobin.c
@@ -14,7 +14,7 @@
  *    notice, this list of conditions and the following disclaimer in
  *    the documentation and/or other materials provided with the
  *    distribution.
- * 3. Neither the name Gregory NuttX nor the names of its contributors may be
+ * 3. Neither the name NuttX nor the names of its contributors may be
  *    used to endorse or promote products derived from this software
  *    without specific prior written permission.
  *
@@ -47,7 +47,10 @@
  * Definitions
  ********************************************************************************/
 
-/* This number may need to be tuned for different processor speeds */
+/* This number may need to be tuned for different processor speeds.  Since these
+ * arrays must be large to very correct SCHED_RR behavior, this test may require
+ * too much memory on many targets.
+ */
 
 /* #define CONFIG_NINTEGERS 32768 Takes forever on 60Mhz ARM7 */