Add some basic fat32 code

sw/test_code/fs_test/Makefile

@@ -0,0 +1,48 @@
+CC=../../cc65/bin/cl65
+LD=../../cc65/bin/cl65
+SIM=../../cc65/bin/sim65 
+CFLAGS=-T -t sim65c02 -I.
+LDFLAGS=-m $(NAME).map
+
+NAME=fs_test
+
+BIN=$(NAME).bin
+
+FS=$(REPO_TOP)/sw/script/fs.fat
+
+LISTS=lists
+
+EXT_SRCS=$(REPO_TOP)/sw/kernel/filesystems/fat32.s
+
+SRCS=$(wildcard *.s) $(wildcard *.c)
+SRCS+=$(wildcard **/*.s) $(wildcard **/*.c)
+OBJS+=$(patsubst %.s,%.o,$(filter %s,$(SRCS)))
+OBJS+=$(patsubst %.c,%.o,$(filter %c,$(SRCS)))
+
+run: all
+	$(SIM) $(BIN)
+
+all: fs.fat fat32.s $(BIN)
+
+$(BIN): $(OBJS)
+	$(CC) $(CFLAGS) $(LDFLAGS) $(OBJS) -o $@
+
+%.o: %.c $(LISTS)
+	$(CC) $(CFLAGS) -l $(LISTS)/$<.list -c $< -o $@
+
+%.o: %.s $(LISTS)
+	$(CC) $(CFLAGS) -l $(LISTS)/$<.list -c $< -o $@
+
+fat32.s: $(EXT_SRCS)
+	cp $^ .
+
+fs.fat: $(FS)
+	cp $^ .
+
+$(LISTS):
+	mkdir -p $(addprefix $(LISTS)/,$(sort $(dir $(SRCS))))
+
+.PHONY: clean
+clean:
+	rm -rf $(OBJS) $(BIN) $(HEX) $(LISTS) $(NAME).map fat32.s
+