# environment vaiables read:
# BOARD = {ml402, denano}
# TLB = {no, yes}
# ENDIANESS = {eb, el}
BOARD ?= ml402
TLB ?= no
ENDIANESS ?= eb

ifeq ($(ENDIANESS),el)
  ENDIAN_FLAGS=-EL
else
  ENDIAN_FLAGS=-EB
endif

CFLAGS=$(ENDIAN_FLAGS) -Os -flto -Wl,-M -I. -I../libsys -msoft-float -march=r3000 -G0 -I../libsys/boards/$(BOARD) -D$(BOARD)
LFLAGS=$(ENDIAN_FLAGS) -Os -flto

ifeq ($(TLB),yes)
  CFLAGS+=-DSYS_IO_BASE=0xAC000000 -DSDRAM_BASE=0x80000000 -DFLASH_BASE_IO=0xA4000000 -DFLASH_BASE_MEM=0x88000000
  LFLAGS+=-T bootloader_tlb.ld
else
  CFLAGS+=-DSYS_IO_BASE=0xA0000000 -DSDRAM_BASE=0x40000000 -DFLASH_BASE_IO=0xA4000000 -DFLASH_BASE_MEM=0x00000000
  LFLAGS+=-T bootloader.ld
endif

BUILD_DIR=./build/$(BOARD)/$(ENDIANESS)
		  
LIBS=-lc -lgcc
CFLAGS += -DXCP_SIZE=4096
		  
CC=mips-elf-gcc
LD=mips-elf-gcc
OBJDUMP=mips-elf-objdump
OBJCOPY=mips-elf-objcopy
ROMGEN=$(MIPS_HOME)/tools/romgen

.PHONY: libsys

all: $(BUILD_DIR) $(BUILD_DIR)/bootloader.elf $(BUILD_DIR)/bootloader_with_flash.elf

OBJS-ml402=$(addprefix $(BUILD_DIR)/, startup.o kernel.o libsys.o board.o uart.o gdb_stub.o)
OBJS-denano=$(addprefix $(BUILD_DIR)/, startup.o kernel.o libsys.o board.o uart.o gdb_stub.o)

$(BUILD_DIR)/uart.o : ../libsys/uart.c
	$(CC) $(CFLAGS) -c -o $@ $<

$(BUILD_DIR)/board.o : boards/$(BOARD)/board.c
	$(CC) $(CFLAGS) -c -o $@ $<

$(BUILD_DIR)/gdb_stub.o : ../libsys/gdb_stub.c
	$(CC) $(CFLAGS) -c -o $@ $<

$(BUILD_DIR)/%.o : %.c
	$(CC) $(CFLAGS) -c -o $@ $<

$(BUILD_DIR)/%.o : %.S
	$(CC) $(CFLAGS) -c -o $@ $<
		  
$(BUILD_DIR)/bootloader.elf: $(OBJS-$(BOARD)) bootloader.c
	$(CC) $(CFLAGS) -o $(BUILD_DIR)/bootloader.o -g -c bootloader.c
	$(LD) $(LFLAGS) $(LIB_DIRS) $(OBJS-$(BOARD)) bootloader.o -o $@ $(LIBS) >$@.map
	$(OBJDUMP) -D $@ > $@.dis
	$(OBJCOPY) $@ -j ROM --output-target=binary $@.ROM.bin
	$(OBJCOPY) -O srec $@ $@.srec
	$(ROMGEN) $@.ROM.bin 11 $(ENDIAN_FLAGS)
		  
$(BUILD_DIR)/bootloader_with_flash.elf: $(OBJS-$(BOARD)) bootloader_with_flash.c ../cfiflash.c
	$(CC) $(CFLAGS) -o $(BUILD_DIR)/bootloader_with_flash.o -g -c bootloader_with_flash.c
	$(CC) $(CFLAGS) -o $(BUILD_DIR)/cfiflash.o -g -c ../cfiflash.c
	$(LD) $(LFLAGS) $(LIB_DIRS) $(OBJS-$(BOARD)) cfiflash.o bootloader_with_flash.o -o $@ $(LIBS) >$@.map
	$(OBJDUMP) -D $@ > $@.dis
	$(OBJCOPY) $@ -j ROM --output-target=binary $@.ROM.bin
	$(OBJCOPY) -O srec $@ $@.srec
	$(ROMGEN) $@.ROM.bin 11 $(ENDIAN_FLAGS)

$(BUILD_DIR):
	mkdir -p $(BUILD_DIR)

clean:
	rm -rf $(BUILD_DIR)/*.* > /dev/null

mrproper:
	rm -rf $(BUILD_DIR)