Add support for nestable interrupts

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1506 42af7a65-404d-4744-a932-0658087f49c3

configs/skp16c26/include/board.h

@@ -63,6 +63,7 @@
 #define S3_DDR		pd8_1
 
 /* LEDs */
+
 #define	RED_LED		p8_0
 #define	YLW_LED		p7_4
 #define	GRN_LED		p7_2
@@ -71,6 +72,11 @@
 #define	YLW_DDR 	pd7_4
 #define	GRN_DDR 	pd7_2
 
+/* IPL settings */
+
+#define M16C_DEFAULT_IPL   0     /* Default M16C Interrupt priority level */
+#undef  M16C_INTERRUPT_IPL       /* Default interrupt IPL to enabled nested interrupts */
+
 /* Define any of the following to specify interrupt priorities.  A default
  * value of 5 will be used for any unspecified values
  */

configs/skp16c26/ostest/defconfig

@@ -33,7 +33,8 @@
 #
 ############################################################################
 #
-# architecture selection
+# architecture selection.  NOTE:  There are additional M16C-specific
+# settings that are provided via the arch/board/board.h file.
 #
 # CONFIG_ARCH - identifies the arch subdirectory and, hence, the
 #   processor architecture.