Add USB serial/storage examples

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2563 42af7a65-404d-4744-a932-0658087f49c3

configs/ea3131/src/Makefile

 ############################################################################
 # configs/ea3131/src/Makefile
 #
-#   Copyright (C) 2009 Gregory Nutt. All rights reserved.
+#   Copyright (C) 2009-2010 Gregory Nutt. All rights reserved.
 #   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
 #
 # Redistribution and use in source and binary forms, with or without
@@ -44,6 +44,9 @@ CSRCS		= up_boot.c up_buttons.c up_clkinit.c up_leds.c up_mem.c up_spi.c
 ifeq ($(CONFIG_EXAMPLES_NSH_ARCHINIT),y)
 CSRCS		+= up_nsh.c
 endif
+ifeq ($(CONFIG_EXAMPLE),usbstorage)
+CSRCS		+= up_usbstrg.c
+endif
 COBJS		= $(CSRCS:.c=$(OBJEXT))
 
 SRCS		= $(ASRCS) $(CSRCS)