w1: build sdbfs if gensdbfs is available

tools/.gitignore

@@ -5,3 +5,4 @@ wrpc-uart-sw
 wrpc-w1-read
 wrpc-w1-write
 eb-w1-write
+sdb-wrpc.bin

tools/Makefile

-EB ?= no
+EB    ?= no
+SDBFS ?= no
 
 CFLAGS = -Wall -ggdb -DEXTERNAL_W1 -I../include
 LDFLAGS = -lutil
@@ -8,6 +9,9 @@ ALL   += wrpc-w1-read wrpc-w1-write
 ifneq ($(EB),no)
 ALL += eb-w1-write
 endif
+ifneq ($(SDBFS),no)
+ALL += sdb-wrpc.bin
+endif
 
 AS		= as
 LD		= ld
@@ -33,5 +37,8 @@ wrpc-w1-write: wrpc-w1-write.c ../dev/w1.c ../dev/w1-eeprom.c ../dev/w1-hw.c
 eb-w1-write: eb-w1-write.c ../dev/w1.c ../dev/w1-eeprom.c eb-w1.c
 	$(CC) $(CFLAGS) -I $(EB) $^ $(LDFLAGS) -o $@ -L $(EB) -letherbone
 
+sdb-wrpc.bin: sdbfs
+	$(SDBFS)/gensdbfs $< $@
+
 clean:
 	rm -f $(ALL) *.o *~