diff --git a/ChangeLog b/ChangeLog
index 7814921b2f..67d641ea67 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -87,6 +87,7 @@
 	  errno; pthread_setscheduler() now returns the correct errno.
 	* Added pthread_setschedprio().
 	* Added directories to hold board-specific header files
+	* Added directories to hold board-specific drivers
 	* Started m68322
 
 
diff --git a/Documentation/NuttxPortingGuide.html b/Documentation/NuttxPortingGuide.html
index c970198fce..e609b5287b 100644
--- a/Documentation/NuttxPortingGuide.html
+++ b/Documentation/NuttxPortingGuide.html
@@ -295,6 +295,8 @@ below and discussed in the following paragraphs:</p>
 <ul><pre>
 	&lt;<i>board-name</i>&gt;
 	|-- include/
+	|-- src/
+	|   `-- Makefile
 	|-- Make.defs
 	|-- defconfig
 	`-- setenv.sh
@@ -310,6 +312,17 @@ below and discussed in the following paragraphs:</p>
     These header file can only be included by files in <code>arch/&lt;arch-name&gt;/include/</code>
     and <code>arch/&lt;arch-name&gt;/src/</code>.
   </li>
+  <li>
+    <code>src/</code>:
+    This directory contains board specific drivers.
+    This directory will be linked as <config>arch/&lt;arch-name&gt;/src/board</config> at configuration
+    time and will be integrated into the build system.
+  </li>
+  <li>
+    <code>src/Makefile</code>:
+    This makefile will be invoked to build the board specific drivers.
+    It must support the following targets:  <code>libext$(LIBEXT)</code>, <code>clean</code>, and <code>distclean</code>.
+  </li>
   <li>
     <code>Make.defs</code>: This makefile fragment provides architecture and
     tool-specific build options.  It will be included by all other
diff --git a/Makefile b/Makefile
index 34cc90910b..69ad07da21 100644
--- a/Makefile
+++ b/Makefile
@@ -80,12 +80,21 @@ include/arch/board: Make.defs include/arch
 	fi
 	@ln -s $(TOPDIR)/$(BOARD_DIR)/include include/arch/board
 
-context: check_context include/nuttx/config.h include/arch include/arch/board
+$(ARCH_SRC)/board: Make.defs
+	@if [ -e $(ARCH_SRC)/board ]; then \
+		if [ -h $(ARCH_SRC)/board ]; then \
+			rm -f $(ARCH_SRC)/board ; \
+		else \
+			echo "$(ARCH_SRC)/board exists but is not a symbolic link" ; \
+			exit 1 ; \
+		fi ; \
+	fi
+	@ln -s $(TOPDIR)/$(BOARD_DIR)/src $(ARCH_SRC)/board
+
+context: check_context include/nuttx/config.h include/arch include/arch/board $(ARCH_SRC)/board
 
 clean_context:
-	rm -f include/nuttx/config.h
-	rm -f include/arch
-	rm -f include/arch/board
+	rm -f include/nuttx/config.h include/arch include/arch/board $(ARCH_SRC)/board
 
 check_context:
 	@if [ ! -e ${TOPDIR}/.config -o ! -e ${TOPDIR}/Make.defs ]; then \
@@ -123,19 +132,26 @@ depend:
 		$(MAKE) -C $$dir TOPDIR=$(TOPDIR) depend ; \
 	done
 
-clean:
+subdir_clean:
 	@for dir in $(SUBDIRS) ; do \
-		$(MAKE) -C $$dir TOPDIR=$(TOPDIR) clean ; \
+		if [ -e $$dir/Makefile ]; then \
+			$(MAKE) -C $$dir TOPDIR=$(TOPDIR) clean ; \
+		fi \
 	done
 	$(MAKE) -C tools -f Makefile.mkconfig TOPDIR=$(TOPDIR) clean
 	$(MAKE) -C mm -f Makefile.test TOPDIR=$(TOPDIR) clean
+
+clean: subdir_clean
 	rm -f $(BIN) $(BIN).* mm_test *.map *~
 
-distclean: clean clean_context
+subdir_distclean:
 	@for dir in $(SUBDIRS) ; do \
-		$(MAKE) -C $$dir TOPDIR=$(TOPDIR) distclean ; \
+		if [ -e $$dir/Makefile ]; then \
+			$(MAKE) -C $$dir TOPDIR=$(TOPDIR) distclean ; \
+		fi \
 	done
-	$(MAKE) -C examples/$(CONFIG_EXAMPLE) TOPDIR=$(TOPDIR) distclean
+
+distclean: clean subdir_distclean clean_context
 	rm -f Make.defs setenv.sh .config
 
 
diff --git a/TODO b/TODO
index 9f83c3e42e..c15c8d23b6 100644
--- a/TODO
+++ b/TODO
@@ -27,15 +27,16 @@ o pthreads
 - pthread_cancel():  Should implemenent cancellation points and pthread_testcancel()
 
 o Libraries
-- There needs to be some kind of mutual exclusion protection on buffered
-  I/O.  If two threads try fflush-ing at the same time, there is corruption
-  of the output.
-- At present, there is a failure in the examples/ostest POSIX timer
-  test when CONFIG_DEBUG is enabled.  This is almost certainly yet
-  another case where printf (or its kin) are being called from a 
-  sensitive area in the OS.
-- I am now seeing the same thing with the dm320 barrier test.
-  Apparently printf has some thread safety issues.
+- There seems to be some kind of failure in the mutual exclusion logic on
+  buffered, "standard," IO.
+  - If two threads try fflush-ing at the same time, there is corruption
+    of the output.
+  - Yhere is a failure in the examples/ostest POSIX timer
+    test when CONFIG_DEBUG is enabled.  This is almost certainly yet
+    another case where printf (or its kin) are being called from a 
+    sensitive area in the OS.
+  - I am now seeing the same thing with the dm320 barrier test.
+    Apparently printf has some thread safety issues.
 
 o File system
 - Add some concept like mount points to handle mounted "real" filesystems.
@@ -47,6 +48,13 @@ o Documentation
 - Document filesystem, library
 
 o Build system
+- Names under arch are incorrect.  These should hold processor architectures.
+  c5471 should be arm7
+  dm320 should be arm9
+  pjrc-8051 should be 805x
+- SoC-specific logic should be in subdirectories under arch/<processor-name>.
+  Eg. arm7/include/c5471 should hold c5471 specific header files
+- configs/pjrc-8051 should be configs/pjrc-87c52
 
 o Applications & Tests
 
diff --git a/arch/c5471/src/Makefile b/arch/c5471/src/Makefile
index b282cbf8df..770c4e3a6b 100644
--- a/arch/c5471/src/Makefile
+++ b/arch/c5471/src/Makefile
@@ -51,7 +51,7 @@ CSRCS		= up_initialize.c up_initialstate.c up_idle.c up_doirq.c \
 		  up_exit.c up_assert.c up_blocktask.c up_unblocktask.c \
 		  up_releasepending.c up_reprioritizertr.c up_copystate.c \
 		  up_schedulesigaction.c up_sigdeliver.c up_serial.c \
-		  up_delay.c up_allocateheap.c up_leds.c up_watchdog.c
+		  up_delay.c up_allocateheap.c up_watchdog.c
 COBJS		= $(CSRCS:.c=.o)
 
 SRCS		= $(ASRCS) $(CSRCS)
@@ -65,6 +65,8 @@ LINKLIBS	=
 LDPATHES	= $(addprefix -L$(TOPDIR)/,$(dir $(LINKLIBS)))
 LDLIBS		= $(patsubst lib%,-l%,$(basename $(notdir $(LINKLIBS))))
 
+BOARDDIR	= $(TOPDIR)/arch/$(CONFIG_ARCH)/src/board
+
 LIBGCC		= ${shell $(CC) -print-libgcc-file-name}
 
 all: up_head.o libarch$(LIBEXT)
@@ -81,9 +83,12 @@ libarch$(LIBEXT): $(OBJS)
 			{ echo "$(AR) $@ $obj FAILED!" ; exit 1 ; } ; \
 	done ; )
 
-nuttx: $(LINKOBJS)
-	$(LD) --entry=__start $(LDFLAGS) $(LDPATHES) -o $(TOPDIR)/$@ $(LINKOBJS) \
-		--start-group $(LDLIBS) --end-group $(EXTRA_LIBS) $(LIBGCC) 
+board/libboard$(LIBEXT):
+	$(MAKE) -C board TOPDIR=$(TOPDIR) libboard$(LIBEXT)
+
+nuttx: $(LINKOBJS) board/libboard$(LIBEXT)
+	$(LD) --entry=__start $(LDFLAGS) $(LDPATHES) -L$(BOARDDIR) -o $(TOPDIR)/$@ $(LINKOBJS) \
+		--start-group $(LDLIBS) -lboard --end-group $(EXTRA_LIBS) $(LIBGCC) 
 	@$(NM) $(TOPDIR)/$@ | \
 	grep -v '\(compiled\)\|\(\.o$$\)\|\( [aUw] \)\|\(\.\.ng$$\)\|\(LASH[RL]DI\)' | \
 	sort > $(TOPDIR)/System.map
@@ -100,15 +105,23 @@ ifeq ($(CONFIG_RRLOAD_BINARY),y)
 endif
 
 .depend: Makefile $(SRCS)
+	echo $(SRCS)
 	$(MKDEP) $(CC) -- $(CFLAGS) -- $(SRCS) >Make.dep
+	$(MAKE) -C board TOPDIR=$(TOPDIR) depend
 	touch $@
 
 depend: .depend
 
 clean:
 	rm -f libarch$(LIBEXT) *.o *~
+	@if [ -e board/Makefile ]; then \
+		$(MAKE) -C board TOPDIR=$(TOPDIR) clean ; \
+	fi
 
 distclean: clean
 	rm -f Make.dep .depend
+	@if [ -e board/Makefile ]; then \
+		$(MAKE) -C board TOPDIR=$(TOPDIR) distclean ; \
+	fi
 
 -include Make.dep
diff --git a/arch/c5471/src/up_assert.c b/arch/c5471/src/up_assert.c
index 6edc2c4dfe..0dad02f891 100644
--- a/arch/c5471/src/up_assert.c
+++ b/arch/c5471/src/up_assert.c
@@ -79,7 +79,7 @@ static inline uint32 up_getsp(void)
  * Name: up_stackdump
  ************************************************************/
 
-#ifdef CONFIG_C5471_STACKDUMP
+#ifdef CONFIG_ARCH_STACKDUMP
 static void up_stackdump(void)
 {
   _TCB *rtcb        = (_TCB*)g_readytorun.head;
@@ -137,7 +137,7 @@ static void _up_assert(int errorcode) /* __attribute__ ((noreturn)) */
        (void)irqsave();
         for(;;)
           {
-#ifdef CONFIG_C5471_LEDS
+#ifdef CONFIG_ARCH_LEDS
             up_ledon(LED_PANIC);
             up_delay(250);
             up_ledoff(LED_PANIC);
diff --git a/arch/c5471/src/up_head.S b/arch/c5471/src/up_head.S
index 770caddceb..d681a177e2 100644
--- a/arch/c5471/src/up_head.S
+++ b/arch/c5471/src/up_head.S
@@ -117,7 +117,7 @@ __start:
 #endif
 	/* Initialize onboard LEDs */
 
-#ifdef CONFIG_C5471_LEDS
+#ifdef CONFIG_ARCH_LEDS
 	bl	up_ledinit
 #endif
 
diff --git a/arch/c5471/src/up_internal.h b/arch/c5471/src/up_internal.h
index 60cc252732..fc5f92f7bd 100644
--- a/arch/c5471/src/up_internal.h
+++ b/arch/c5471/src/up_internal.h
@@ -153,7 +153,7 @@ extern void up_maskack_irq(int irq);
 
 /* Defined in up_leds.c */
 
-#ifdef CONFIG_C5471_LEDS
+#ifdef CONFIG_ARCH_LEDS
 extern void up_ledinit(void);
 extern void up_ledon(int led);
 extern void up_ledoff(int led);
diff --git a/configs/README.txt b/configs/README.txt
index 5962c34a4a..e15c57c36f 100644
--- a/configs/README.txt
+++ b/configs/README.txt
@@ -25,6 +25,8 @@ following characteristics:
 
 	<board-name>
 	|-- include/
+	|-- src/
+	|   `-- Makefile
 	|-- Make.defs
 	|-- defconfig
 	`-- setenv.sh
@@ -32,12 +34,20 @@ following characteristics:
 Summary of Files
 ^^^^^^^^^^^^^^^^
 
-include/ -- This directoy contains board specific header files.  This
+include/ -- This directory contains board specific header files.  This
   directory will be linked as include/arch/board at configuration time and
   can be included via '#include <arch/board/header.h>'.  These header file
   can only be included by files in arch/<arch-name>include/ and
   arch/<arch-name>/src
 
+src/ -- This directory contains board specific drivers.  This
+  directory will be linked as arch/<arch-name>/src/board at configuration
+  time and will be integrated into the build system.
+
+src/Makefile -- This makefile will be invoked to build the board specific
+  drivers.  It must support the following targets:  libext$(LIBEXT), clean,
+  and distclean.
+
 Make.defs -- This makefile fragment provides architecture and
   tool-specific build options.  It will be included by all other
   makefiles in the build (once it is installed).  This make fragment
diff --git a/configs/c5471evm/defconfig b/configs/c5471evm/defconfig
index a65cdb4358..2971805c51 100644
--- a/configs/c5471evm/defconfig
+++ b/configs/c5471evm/defconfig
@@ -35,15 +35,19 @@
 #
 # architecture selection
 #
-# CONFIG_ARCH - identifies the arch subdirectory
-# CONFIG_ARCH_name - for use in C code
-# CONFIG_BOARD - identifies the configs subdirectory
-# CONFIG_BARD_name - for use in C code
+# CONFIG_ARCH - identifies the arch subdirectory and, hence, the
+#   processor architecture.
+# CONFIG_ARCH_name - for use in C code.  This identifies the
+#   particular chip or SoC that the architecture is implemented
+#   in.
+# CONFIG_BOARD - identifies the configs subdirectory and, hence,
+#   the board that supports the particular chip or SoC.
+# CONFIG_BOARD_name - for use in C code
 # CONFIG_ROM_VECTORS - unique to c5471
 # CONFIG_DRAM_END - the size of installed DRAM.
 #   Unique to c5471
-# CONFIG_C5471_LEDS - Use LEDs to show state. Unique to c5471.
-# CONFIG_C5471_STACKDUMP - Do stack dumps after assertions
+# CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to c5471.
+# CONFIG_ARCH_STACKDUMP - Do stack dumps after assertions
 #
 CONFIG_ARCH=c5471
 CONFIG_ARCH_C5471=y
@@ -51,8 +55,8 @@ CONFIG_BOARD=c5471evm
 CONFIG_BOARD_C5471EVM=y
 CONFIG_ROM_VECTORS=n
 CONFIG_DRAM_END=0x11000000
-CONFIG_C5471_LEDS=y
-CONFIG_C5471_STACKDUMP=y
+CONFIG_ARCH_LEDS=y
+CONFIG_ARCH_STACKDUMP=y
 
 #
 # C5471 specific device driver settings
diff --git a/configs/m68332evb/defconfig b/configs/m68332evb/defconfig
index 86a7e059a5..c63dc6aa23 100644
--- a/configs/m68332evb/defconfig
+++ b/configs/m68332evb/defconfig
@@ -35,10 +35,14 @@
 #
 # architecture selection
 #
-# CONFIG_ARCH - identifies the arch subdirectory
-# CONFIG_ARCH_name - for use in C code
-# CONFIG_BOARD - identifies the configs subdirectory
-# CONFIG_BARD_name - for use in C code
+# CONFIG_ARCH - identifies the arch subdirectory and, hence, the
+#   processor architecture.
+# CONFIG_ARCH_name - for use in C code.  This identifies the
+#   particular chip or SoC that the architecture is implemented
+#   in.
+# CONFIG_BOARD - identifies the configs subdirectory and, hence,
+#   the board that supports the particular chip or SoC.
+# CONFIG_BOARD_name - for use in C code
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_ARCH_STACKDUMP - Do stack dumps after assertions
 #
diff --git a/configs/ntosd-dm320/defconfig b/configs/ntosd-dm320/defconfig
index 1763fe0f4c..7ea06e2170 100644
--- a/configs/ntosd-dm320/defconfig
+++ b/configs/ntosd-dm320/defconfig
@@ -35,10 +35,14 @@
 #
 # architecture selection
 #
-# CONFIG_ARCH - identifies the arch subdirectory
-# CONFIG_ARCH_name - for use in C code
-# CONFIG_BOARD - identifies the configs subdirectory
-# CONFIG_BARD_name - for use in C code
+# CONFIG_ARCH - identifies the arch subdirectory and, hence, the
+#   processor architecture.
+# CONFIG_ARCH_name - for use in C code.  This identifies the
+#   particular chip or SoC that the architecture is implemented
+#   in.
+# CONFIG_BOARD - identifies the configs subdirectory and, hence,
+#   the board that supports the particular chip or SoC.
+# CONFIG_BOARD_name - for use in C code
 # CONFIG_ROM_VECTORS - unique to dm320
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_ARCH_STACKDUMP - Do stack dumps after assertions
diff --git a/configs/pjrc-8051/defconfig b/configs/pjrc-8051/defconfig
index 316bda2b4b..cc5da93bd7 100644
--- a/configs/pjrc-8051/defconfig
+++ b/configs/pjrc-8051/defconfig
@@ -35,9 +35,13 @@
 #
 # Architecture selection
 #
-# CONFIG_ARCH - identifies the arch subdirectory
+# CONFIG_ARCH - identifies the arch subdirectory and, hence, the
+#   processor architecture.
 # CONFIG_ARCH_8051 - Set if processor is 8051 family
 # CONFIG_ARCH_8052 = Set if processor is 8052 family
+# CONFIG_BOARD - identifies the configs subdirectory and, hence,
+#   the board that supports the particular chip or SoC.
+# CONFIG_BOARD_name - for use in C code
 # CONFIG_BOARD - identifies the configs subdirectory
 # CONFIG_BARD_name - for use in C code
 #
diff --git a/configs/sim/defconfig b/configs/sim/defconfig
index 13e1030eea..935ca1db25 100644
--- a/configs/sim/defconfig
+++ b/configs/sim/defconfig
@@ -35,10 +35,14 @@
 #
 # architecture selection
 #
-# CONFIG_ARCH - identifies the arch subdirectory
-# CONFIG_ARCH_name - for use in C code
-# CONFIG_BOARD - identifies the configs subdirectory
-# CONFIG_BARD_name - for use in C code
+# CONFIG_ARCH - identifies the arch subdirectory and, hence, the
+#   processor architecture.
+# CONFIG_ARCH_name - for use in C code.  This identifies the
+#   particular chip or SoC that the architecture is implemented
+#   in.
+# CONFIG_BOARD - identifies the configs subdirectory and, hence,
+#   the board that supports the particular chip or SoC.
+# CONFIG_BOARD_name - for use in C code
 #
 CONFIG_ARCH=sim
 CONFIG_ARCH_SIM=y