Serial driver needed even when no console; Fix user LED settings in all STM32 configurations

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5575 42af7a65-404d-4744-a932-0658087f49c3

arch/arm/src/common/up_initialize.c

@@ -1,7 +1,7 @@
 /****************************************************************************
  * arch/arm/src/common/up_initialize.c
  *
- *   Copyright (C) 2007-2010, 2012 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007-2010, 2012-2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -161,11 +161,17 @@ void up_initialize(void)
   devnull_register();   /* Standard /dev/null */
 #endif
 
-  /* Initialize the console device driver */
+  /* Initialize the serial device driver */
 
-#if defined(USE_SERIALDRIVER)
+#ifdef USE_SERIALDRIVER
   up_serialinit();
-#elif defined(CONFIG_DEV_LOWCONSOLE)
+#endif
+
+  /* Initialize the console device driver (if it is other than the standard
+   * serial driver).
+   */
+
+#if defined(CONFIG_DEV_LOWCONSOLE)
   lowconsole_init();
 #elif defined(CONFIG_RAMLOG_CONSOLE)
   ramlog_consoleinit();

arch/arm/src/common/up_internal.h

@@ -1,7 +1,7 @@
 /****************************************************************************
  * common/up_internal.h
  *
- *   Copyright (C) 2007-2012 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007-2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -63,7 +63,10 @@
 #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 */
+/* Determine which (if any) console driver to use.  If a console is enabled
+ * and no other console device is specified, then a serial console is
+ * assumed.
+ */
 
 #if !defined(CONFIG_DEV_CONSOLE) || CONFIG_NFILE_DESCRIPTORS == 0
 #  undef  USE_SERIALDRIVER
@@ -84,6 +87,16 @@
 #  endif
 #endif
 
+/* If some other device is used as the console, then the serial driver may
+ * still be needed.  Let's assume that if the upper half serial driver is
+ * built, then the lower half will also be needed.  There is no need for
+ * the early serial initialization in this case.
+ */
+
+#if !defined(USE_SERIALDRIVER) && defined(CONFIG_STANDARD_SERIAL)
+#  define USE_SERIALDRIVER 1
+#endif
+
 /* Determine which device to use as the system logging device */
 
 #ifndef CONFIG_SYSLOG

arch/avr/src/at32uc3/at32uc3_config.h

@@ -1,7 +1,7 @@
 /************************************************************************************
  * arch/avr/src/at32uc3/at32uc3_config.h
  *
- *   Copyright (C) 2010 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2010, 2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -144,7 +144,10 @@
 #  undef HAVE_SERIAL_CONSOLE
 #endif
 
-/* Determine which (if any) console driver to use */
+/* Determine which (if any) console driver to use.  If a console is enabled
+ * and no other console device is specified, then a serial console is
+ * assumed.
+ */
 
 #if !defined(CONFIG_DEV_CONSOLE) || CONFIG_NFILE_DESCRIPTORS <= 0
 #  undef  USE_SERIALDRIVER
@@ -168,6 +171,16 @@
 #  endif
 #endif
 
+/* If some other device is used as the console, then the serial driver may
+ * still be needed.  Let's assume that if the upper half serial driver is
+ * built, then the lower half will also be needed.  There is no need for
+ * the early serial initialization in this case.
+ */
+
+#if !defined(USE_SERIALDRIVER) && defined(CONFIG_STANDARD_SERIAL)
+#  define USE_SERIALDRIVER 1
+#endif
+
 /* Determine which device to use as the system logging device */
 
 #ifndef CONFIG_SYSLOG

arch/avr/src/at90usb/at90usb_config.h

@@ -1,7 +1,7 @@
 /************************************************************************************
  * arch/avr/src/at90usb/at90usb_config.h
  *
- *   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2011-2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -63,7 +63,10 @@
 #  undef HAVE_SERIAL_CONSOLE
 #endif
 
-/* Determine which (if any) console driver to use */
+/* Determine which (if any) console driver to use.  If a console is enabled
+ * and no other console device is specified, then a serial console is
+ * assumed.
+ */
 
 #if !defined(CONFIG_DEV_CONSOLE) || CONFIG_NFILE_DESCRIPTORS <= 0
 #  undef  USE_SERIALDRIVER
@@ -87,6 +90,16 @@
 #  endif
 #endif
 
+/* If some other device is used as the console, then the serial driver may
+ * still be needed.  Let's assume that if the upper half serial driver is
+ * built, then the lower half will also be needed.  There is no need for
+ * the early serial initialization in this case.
+ */
+
+#if !defined(USE_SERIALDRIVER) && defined(CONFIG_STANDARD_SERIAL)
+#  define USE_SERIALDRIVER 1
+#endif
+
 /* Determine which device to use as the system logging device */
 
 #ifndef CONFIG_SYSLOG

arch/avr/src/atmega/atmega_config.h

@@ -1,7 +1,7 @@
 /************************************************************************************
  * arch/avr/src/atmega/atmega_config.h
  *
- *   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2011-2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -68,7 +68,10 @@
 #  undef HAVE_SERIAL_CONSOLE
 #endif
 
-/* Determine which (if any) console driver to use */
+/* Determine which (if any) console driver to use.  If a console is enabled
+ * and no other console device is specified, then a serial console is
+ * assumed.
+ */
 
 #if !defined(CONFIG_DEV_CONSOLE) || CONFIG_NFILE_DESCRIPTORS <= 0
 #  undef  USE_SERIALDRIVER
@@ -92,6 +95,16 @@
 #  endif
 #endif
 
+/* If some other device is used as the console, then the serial driver may
+ * still be needed.  Let's assume that if the upper half serial driver is
+ * built, then the lower half will also be needed.  There is no need for
+ * the early serial initialization in this case.
+ */
+
+#if !defined(USE_SERIALDRIVER) && defined(CONFIG_STANDARD_SERIAL)
+#  define USE_SERIALDRIVER 1
+#endif
+
 /* Determine which device to use as the system logging device */
 
 #ifndef CONFIG_SYSLOG

arch/avr/src/common/up_initialize.c

@@ -1,7 +1,7 @@
 /****************************************************************************
  * arch/avr/src/common/up_initialize.c
  *
- *   Copyright (C) 2010, 2012 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2010, 2012-2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -57,6 +57,10 @@
  * up_serialinit to be incorrectly called if there is no USART configured to
  * be an RS-232 device (see as an example arch/avr/src/at32uc23/at32uc3_config.h)
  * This will probably have to be revisited someday.
+ *
+ * If a console is enabled and no other console device is specified, then a
+ * serial console is
+ * assumed.
  */
 
 #if !defined(CONFIG_DEV_CONSOLE) || CONFIG_NFILE_DESCRIPTORS <= 0
@@ -78,6 +82,16 @@
 #  endif
 #endif
 
+/* If some other device is used as the console, then the serial driver may
+ * still be needed.  Let's assume that if the upper half serial driver is
+ * built, then the lower half will also be needed.  There is no need for
+ * the early serial initialization in this case.
+ */
+
+#if !defined(USE_SERIALDRIVER) && defined(CONFIG_STANDARD_SERIAL)
+#  define USE_SERIALDRIVER 1
+#endif
+
 /* Determine which device to use as the system logging device */
 
 #ifndef CONFIG_SYSLOG
@@ -182,11 +196,17 @@ void up_initialize(void)
   devnull_register();   /* Standard /dev/null */
 #endif
 
-  /* Initialize the console device driver */
+  /* Initialize the serial device driver */
 
-#if defined(USE_SERIALDRIVER)
+#ifdef USE_SERIALDRIVER
   up_serialinit();
-#elif defined(CONFIG_DEV_LOWCONSOLE)
+#endif
+
+  /* Initialize the console device driver (if it is other than the standard
+   * serial driver).
+   */
+
+#if defined(CONFIG_DEV_LOWCONSOLE)
   lowconsole_init();
 #elif defined(CONFIG_RAMLOG_CONSOLE)
   ramlog_consoleinit();

arch/hc/src/common/up_initialize.c

@@ -1,7 +1,7 @@
 /****************************************************************************
  * arch/hc/src/common/up_initialize.c
  *
- *   Copyright (C) 2009-2010, 2012 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2009-2010, 2012-2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -149,11 +149,17 @@ void up_initialize(void)
   devnull_register();   /* Standard /dev/null */
 #endif
 
-  /* Initialize the console device driver */
+  /* Initialize the serial device driver */
 
-#if defined(USE_SERIALDRIVER)
+#ifdef USE_SERIALDRIVER
   up_serialinit();
-#elif defined(CONFIG_DEV_LOWCONSOLE)
+#endif
+
+  /* Initialize the console device driver (if it is other than the standard
+   * serial driver).
+   */
+
+#if defined(CONFIG_DEV_LOWCONSOLE)
   lowconsole_init();
 #elif defined(CONFIG_RAMLOG_CONSOLE)
   ramlog_consoleinit();

arch/hc/src/common/up_internal.h

@@ -1,7 +1,7 @@
 /****************************************************************************
  * arch/hc/src/common/up_internal.h
  *
- *   Copyright (C) 2009, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2009, 2011-2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -62,7 +62,10 @@
 #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 */
+/* Determine which (if any) console driver to use.  If a console is enabled
+ * and no other console device is specified, then a serial console is
+ * assumed.
+ */
 
 #if !defined(CONFIG_DEV_CONSOLE) || CONFIG_NFILE_DESCRIPTORS <= 0
 #  undef  USE_SERIALDRIVER
@@ -83,6 +86,16 @@
 #  endif
 #endif
 
+/* If some other device is used as the console, then the serial driver may
+ * still be needed.  Let's assume that if the upper half serial driver is
+ * built, then the lower half will also be needed.  There is no need for
+ * the early serial initialization in this case.
+ */
+
+#if !defined(USE_SERIALDRIVER) && defined(CONFIG_STANDARD_SERIAL)
+#    define USE_SERIALDRIVER 1
+#endif
+
 /* Determine which device to use as the system logging device */
 
 #ifndef CONFIG_SYSLOG

arch/mips/src/common/up_initialize.c

@@ -151,11 +151,17 @@ void up_initialize(void)
   devnull_register();   /* Standard /dev/null */
 #endif
 
-  /* Initialize the console device driver */
+  /* Initialize the serial device driver */
 
-#if defined(USE_SERIALDRIVER)
+#ifdef USE_SERIALDRIVER
   up_serialinit();
-#elif defined(CONFIG_DEV_LOWCONSOLE)
+#endif
+
+  /* Initialize the console device driver (if it is other than the standard
+   * serial driver).
+   */
+
+#if defined(CONFIG_DEV_LOWCONSOLE)
   lowconsole_init();
 #elif defined(CONFIG_RAMLOG_CONSOLE)
   ramlog_consoleinit();

arch/mips/src/common/up_internal.h

@@ -60,7 +60,10 @@
 #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 */
+/* Determine which (if any) console driver to use.  If a console is enabled
+ * and no other console device is specified, then a serial console is
+ * assumed.
+ */
 
 #if !defined(CONFIG_DEV_CONSOLE) || CONFIG_NFILE_DESCRIPTORS <= 0
 #  undef  USE_SERIALDRIVER
@@ -81,6 +84,16 @@
 #  endif
 #endif
 
+/* If some other device is used as the console, then the serial driver may
+ * still be needed.  Let's assume that if the upper half serial driver is
+ * built, then the lower half will also be needed.  There is no need for
+ * the early serial initialization in this case.
+ */
+
+#if !defined(USE_SERIALDRIVER) && defined(CONFIG_STANDARD_SERIAL)
+#  define USE_SERIALDRIVER 1
+#endif
+
 /* Determine which device to use as the system logging device */
 
 #ifndef CONFIG_SYSLOG

arch/sh/src/common/up_initialize.c

@@ -1,7 +1,7 @@
 /****************************************************************************
  * arch/sh/src/common/up_initialize.c
  *
- *   Copyright (C) 2008-2010, 2012 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2008-2010, 2012-2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -136,16 +136,20 @@ void up_initialize(void)
   devnull_register();   /* Standard /dev/null */
 #endif
 
-  /* Initialize the console device driver.  NOTE that the naming
+  /* Initialize the serial device driver */
-   * implies that the console is a serial driver.  That is usually the case,
+
-   * however, if no UARTs are enabled, the console could als be provided
+#ifdef USE_SERIALDRIVER
-   * through some other device, such as an LCD.  Architecture-specific logic
+  up_serialinit();
-   * will have to detect that case.
+#endif
+
+  /* Initialize the console device driver (if it is other than the standard
+   * serial driver). NOTE that the naming implies that the console is a serial
+   * driver.  That is usually the case, however, if no UARTs are enabled, the
+   * console could als be provided through some other device, such as an LCD.
+   * Architecture-specific logic will have to detect that case.
    */
 
-#if defined(USE_SERIALDRIVER)
+#if defined(CONFIG_DEV_LOWCONSOLE)
-  up_consoleinit();
-#elif defined(CONFIG_DEV_LOWCONSOLE)
   lowconsole_init();
 #elif defined(CONFIG_RAMLOG_CONSOLE)
   ramlog_consoleinit();

arch/sh/src/common/up_internal.h

@@ -1,7 +1,7 @@
 /****************************************************************************
  * arch/sh/src/common/up_internal.h
  *
- *   Copyright (C) 2008-2009, 2012 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2008-2009, 2012-2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -67,6 +67,9 @@
  * however, if no UARTs are enabled, the console could als be provided
  * through some other device, such as an LCD.  Architecture-specific logic
  * will have to detect that case.
+ *
+ * If a console is enabled and no other console device is specified, then
+ * a serial console is assumed.
  */
 
 #if !defined(CONFIG_DEV_CONSOLE) || CONFIG_NFILE_DESCRIPTORS <= 0
@@ -88,6 +91,16 @@
 #  endif
 #endif
 
+/* If some other device is used as the console, then the serial driver may
+ * still be needed.  Let's assume that if the upper half serial driver is
+ * built, then the lower half will also be needed.  There is no need for
+ * the early serial initialization in this case.
+ */
+
+#if !defined(USE_SERIALDRIVER) && defined(CONFIG_STANDARD_SERIAL)
+#  define USE_SERIALDRIVER 1
+#endif
+
 /* Determine which device to use as the system logging device */
 
 #ifndef CONFIG_SYSLOG

arch/x86/src/common/up_initialize.c

@@ -1,7 +1,7 @@
 /****************************************************************************
  * arch/x86/src/common/up_initialize.c
  *
- *   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2011-2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -151,11 +151,17 @@ void up_initialize(void)
   devnull_register();   /* Standard /dev/null */
 #endif
 
-  /* Initialize the console device driver */
+  /* Initialize the serial device driver */
 
-#if defined(USE_SERIALDRIVER)
+#ifdef USE_SERIALDRIVER
   up_serialinit();
-#elif defined(CONFIG_DEV_LOWCONSOLE)
+#endif
+
+  /* Initialize the console device driver (if it is other than the standard
+   * serial driver).
+   */
+
+#if defined(CONFIG_DEV_LOWCONSOLE)
   lowconsole_init();
 #elif defined(CONFIG_RAMLOG_CONSOLE)
   ramlog_consoleinit();

arch/x86/src/common/up_internal.h

@@ -1,7 +1,7 @@
 /****************************************************************************
  * arch/x86/src/common/up_internal.h
  *
- *   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2011-2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -62,7 +62,10 @@
 #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 */
+/* Determine which (if any) console driver to use.  If a console is enabled
+ * and no other console device is specified, then a serial console is
+ * assumed.
+ */
 
 #if !defined(CONFIG_DEV_CONSOLE) || CONFIG_NFILE_DESCRIPTORS <= 0
 #  undef  USE_SERIALDRIVER
@@ -83,6 +86,16 @@
 #  endif
 #endif
 
+/* If some other device is used as the console, then the serial driver may
+ * still be needed.  Let's assume that if the upper half serial driver is
+ * built, then the lower half will also be needed.  There is no need for
+ * the early serial initialization in this case.
+ */
+
+#if !defined(USE_SERIALDRIVER) && defined(CONFIG_STANDARD_SERIAL)
+#  define USE_SERIALDRIVER 1
+#endif
+
 /* Determine which device to use as the system logging device */
 
 #ifndef CONFIG_SYSLOG

arch/z16/src/common/up_initialize.c

@@ -1,7 +1,7 @@
 /****************************************************************************
  * common/up_initialize.c
  *
- *   Copyright (C) 2008-2009, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2008-2009, 2011-2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -168,7 +168,9 @@ void up_initialize(void)
   up_serialinit();
 #endif
 
-  /* Initialize the console device driver */
+  /* Initialize the console device driver (if it is other than the standard
+   * serial driver).
+   */
 
 #if defined(CONFIG_DEV_LOWCONSOLE)
   lowconsole_init();

arch/z16/src/common/up_internal.h

@@ -1,7 +1,7 @@
 /****************************************************************************
  * common/up_internal.h
  *
- *   Copyright (C) 2008-2009, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2008-2009, 2011-2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -60,15 +60,42 @@
 #undef  CONFIG_Z16_LOWPUTC            /* Support up_lowputc for debug */
 #undef  CONFIG_Z16_LOWGETC            /* support up_lowgetc for debug */
 
-/* Determine which (if any) console driver to use */
+/* Determine which (if any) console driver to use.  If a console is enabled
+ * and no other console device is specified, then a serial console is
+ * assumed.
+ */
 
 #if defined(CONFIG_Z16_LOWPUTC) || defined(CONFIG_Z16_LOWGETC) || \
     CONFIG_NFILE_DESCRIPTORS == 0 || defined(CONFIG_DEV_LOWCONSOLE)
 #  define USE_LOWCONSOLE 1
 #  define USE_LOWUARTINIT 1
-#elif defined(CONFIG_DEV_CONSOLE) && CONFIG_NFILE_DESCRIPTORS > 0
+#elif !defined(CONFIG_DEV_CONSOLE) || CONFIG_NFILE_DESCRIPTORS <= 0
+#  undef  USE_SERIALDRIVER
+#  undef  USE_EARLYSERIALINIT
+#  undef  CONFIG_DEV_LOWCONSOLE
+#  undef  CONFIG_RAMLOG_CONSOLE
+#else
+#  if defined(CONFIG_RAMLOG_CONSOLE)
+#    undef  USE_SERIALDRIVER
+#    undef  USE_EARLYSERIALINIT
+#    undef  CONFIG_DEV_LOWCONSOLE
+#  elif defined(CONFIG_DEV_LOWCONSOLE)
+#    undef  USE_SERIALDRIVER
+#    undef  USE_EARLYSERIALINIT
+#  else
+#    define USE_SERIALDRIVER 1
+#    define USE_EARLYSERIALINIT 1
+#  endif
+#endif
+
+/* If some other device is used as the console, then the serial driver may
+ * still be needed.  Let's assume that if the upper half serial driver is
+ * built, then the lower half will also be needed.  There is no need for
+ * the early serial initialization in this case.
+ */
+
+#if !defined(USE_SERIALDRIVER) && defined(CONFIG_STANDARD_SERIAL)
 #  define USE_SERIALDRIVER 1
-#  define USE_EARLYSERIALINIT 1
 #endif
 
 /* Determine which device to use as the system logging device */

arch/z80/src/common/up_initialize.c

@@ -1,7 +1,7 @@
 /****************************************************************************
  * arch/z80/src/common/up_initialize.c
  *
- *   Copyright (C) 2007-2009, 2012 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007-2009, 2012-2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -161,15 +161,15 @@ void up_initialize(void)
 
   /* Initialize the serial device driver */
 
-#ifdef USE_LOWSERIALINIT
+#ifdef USE_SERIALDRIVER
-  up_lowserialinit();
+  up_serialinit();
 #endif
 
-  /* Initialize the console device driver */
+  /* Initialize the console device driver (if it is other than the standard
+   * serial driver).
+   */
 
-#if defined(USE_SERIALDRIVER)
+#if defined(CONFIG_DEV_LOWCONSOLE)
-  up_serialinit();
-#elif defined(CONFIG_DEV_LOWCONSOLE)
   lowconsole_init();
 #elif defined(CONFIG_RAMLOG_CONSOLE)
   ramlog_consoleinit();

arch/z80/src/common/up_internal.h

@@ -66,7 +66,10 @@
  * Definitions
  ****************************************************************************/
 
-/* Determine which (if any) console driver to use */
+/* Determine which (if any) console driver to use.  If a console is enabled
+ * and no other console device is specified, then a serial console is
+ * assumed.
+ */
 
 #if CONFIG_NFILE_DESCRIPTORS == 0 || defined(CONFIG_DEV_LOWCONSOLE)
 #  undef USE_SERIALDRIVER
@@ -75,9 +78,31 @@
 #  else
 #    undef USE_LOWSERIALINIT
 #  endif
-#elif defined(CONFIG_DEV_CONSOLE) && CONFIG_NFILE_DESCRIPTORS > 0
+#elif !defined(CONFIG_DEV_CONSOLE) || CONFIG_NFILE_DESCRIPTORS <= 0
+#  undef  USE_SERIALDRIVER
+#  undef  USE_LOWSERIALINIT
+#  undef  CONFIG_DEV_LOWCONSOLE
+#  undef  CONFIG_RAMLOG_CONSOLE
+#else
+#  undef  USE_LOWSERIALINIT
+#  if defined(CONFIG_RAMLOG_CONSOLE)
+#    undef  USE_SERIALDRIVER
+#    undef  CONFIG_DEV_LOWCONSOLE
+#  elif defined(CONFIG_DEV_LOWCONSOLE)
+#    undef  USE_SERIALDRIVER
+#  else
+#    define USE_SERIALDRIVER 1
+#  endif
+#endif
+
+/* If some other device is used as the console, then the serial driver may
+ * still be needed.  Let's assume that if the upper half serial driver is
+ * built, then the lower half will also be needed.  There is no need for
+ * the early serial initialization in this case.
+ */
+
+#if !defined(USE_SERIALDRIVER) && defined(CONFIG_STANDARD_SERIAL)
 #  define USE_SERIALDRIVER 1
-#  undef USE_LOWSERIALINIT
 #endif
 
 /****************************************************************************