因工作需要，做了個簡單的 makefile

#
# SDCC Makefile
#
# Memory Layout
#   Program Size: 4KB
#   Internal Mem: 256B
#   External Mem: 4KB


# ------------------------------------------------------
# PATH

INCDIR  = ../inc
SRCDIR  = ./src
OBJDIR  = ./obj

LIBDIR  =  

# ------------------------------------------------------
# UTILITY

UTILDIR = ../../util
HEX2BIN = $(UTILDIR)/hex2bin/bin/hex2bin

# ------------------------------------------------------
# Target and Source

TARGET = prom
OBJ = 
	$(OBJDIR)/printf.c.rel      
	$(OBJDIR)/debug.c.rel      
	$(OBJDIR)/gpio.c.rel       
	$(OBJDIR)/spi.c.rel        
	$(OBJDIR)/s25fl040a.c.rel  
	$(OBJDIR)/main.c.rel       
	$(OBJDIR)/crtstart.asm.rel

# ------------------------------------------------------
# SDCC

CC = sdcc
AS = sdas8051

# ------------------------------------------------------
# Memory Layout

# PRG Size = 4K Bytes
CODE_SIZE = --code-loc 0x0000 --code-size 4096

# INT-MEM Size = 256 Bytes
IRAM_SIZE = --idata-loc 0x0000  --iram-size 256

# EXT-MEM Size = 4K Bytes
XRAM_SIZE = --xram-loc 0x0000 --xram-size 4096

# ------------------------------------------------------
# MCS51 Options

# Memory Model (small, medium, large, huge)
MODEL  = medium

#LIBS    = 
#LIBPATH = -L $(LIBDIR)

#DEBUG = --debug
AFLAGS = -l -s
CFLAGS = -I./inc -I$(INCDIR) -mmcs51 --model-$(MODEL) --out-fmt-ihx --no-xinit-opt $(DEBUG)
LFLAGS = $(LIBPATH) $(LIBS) -mmcs51 --model-$(MODEL) $(CODE_SIZE) $(IRAM_SIZE) $(XRAM_SIZE) --out-fmt-ihx  $(DEBUG)

# ------------------------------------------------------
# S = @

.PHONY: all util clean
.SECONDARY:

all: util $(OBJDIR)/$(TARGET).memh

util:
	(cd $(UTILDIR)/hex2bin; make)

%.memh: %.bin
	$(S) hexdump -v -e '"@%04.4_ax " 16/1 "%02x " "n"' $^ > $@

%.bin: %.hex
	$(S) $(HEX2BIN) -s 0 -l 1000 -p ff $^

%.hex: %.ihx
	$(S) packihx $^ > $@

%.ihx: $(OBJ)
	$(S) $(CC) -o $@ $(LFLAGS) $^

$(OBJDIR)/%.c.rel: $(SRCDIR)/%.c
	$(S) $(CC) -o $@ $(CFLAGS) -c $^

$(OBJDIR)/%.asm.rel: $(SRCDIR)/%.asm
	$(S) $(AS) $(AFLAGS) -o $@ $^ 

clean:
	$(S) rm -rf $(OBJDIR)/*
	(cd $(UTILDIR)/hex2bin; make clean)