National Semiconductor DP83815/DP83816 and DP83820 NIC programmer support

Some instability remains, but that may be due to hardware problems in
the specific card (Netgear FA311) used for testing.

Corresponding to flashrom svn r1039.

Signed-off-by: Andrew Morgan <ziltro@ziltro.com>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
diff --git a/Makefile b/Makefile
index 18c5a6b..2e774df 100644
--- a/Makefile
+++ b/Makefile
@@ -113,6 +113,9 @@
 # Always enable Realtek NICs for now.
 CONFIG_NICREALTEK ?= yes
 
+# Disable National Semiconductor NICs until support is complete and tested.
+CONFIG_NICNATSEMI ?= no
+
 # Always enable Bus Pirate SPI for now.
 CONFIG_BUSPIRATE_SPI ?= yes
 
@@ -192,6 +195,12 @@
 NEED_PCI := yes
 endif
 
+ifeq ($(CONFIG_NICNATSEMI), yes)
+FEATURE_CFLAGS += -D'CONFIG_NICNATSEMI=1'
+PROGRAMMER_OBJS += nicnatsemi.o
+NEED_PCI := yes
+endif
+
 ifeq ($(CONFIG_BUSPIRATE_SPI), yes)
 FEATURE_CFLAGS += -D'CONFIG_BUSPIRATE_SPI=1'
 PROGRAMMER_OBJS += buspirate_spi.o