felboot: NO_PRINTF=1 make option to disable printf for smaller code size

felboot/Makefile

@@ -30,7 +30,15 @@ UBOOT_OBJS= \
 .c.o:
 	$(CROSS_COMPILE)$(CC) -c $(CFLAGS) $< -o $@
 
-fel-boot-$(BOARD).elf: main.o printf-stdarg.o early_print.o $(addprefix $(UBOOTOBJ),$(UBOOT_OBJS))
+OBJS += main.o
+
+ifeq ($(NO_PRINTF),1)
+CFLAGS += -DNO_PRINTF
+else
+OBJS += printf-stdarg.o early_print.o
+endif
+
+fel-boot-$(BOARD).elf: $(OBJS) $(addprefix $(UBOOTOBJ),$(UBOOT_OBJS))
 	$(CROSS_COMPILE)$(CC) -Tfel-boot.ld -static -nostartfiles $(CFLAGS) -Wl,-Map=$@.map $^ -o $@
 
 fel-boot-$(BOARD).bin: fel-boot-$(BOARD).elf

felboot/README.txt

@@ -28,6 +28,9 @@ Build instructions:
 
 make BOARD=cubieboard CROSS_COMPILE=arm-linux-gnueabihf- UBOOT=~/SRC/u-boot/ UBOOTOBJ=~/SRC/u-boot/build/'$(BOARD)'/
 
+Other options
+	NO_PRINTF=1	Disable printf, reducing the code size a bit
+
 Defaults:
 
 # Target board name. This should match the dram_<boardname>.c in

felboot/main.c

@@ -38,9 +38,6 @@ void sunxi_wemac_initialize(void)
 {
 }
 
-void *gd;
-int gdata;
-
 void preloader_console_init(void)
 {
 }
@@ -55,6 +52,18 @@ void udelay(unsigned long usec)
 	__udelay(usec);
 }
 
+int sunxi_mmc_init(void)
+{
+	return -1;
+}
+
+int status_led_set(void)
+{
+	return -1;
+}
+
+
+#ifndef NO_PRINTF
 int putchar(int ch)
 {
 	return uart_putc(ch);
@@ -65,12 +74,24 @@ int puts(const char *str)
 	return uart_puts(str);
 }
 
-int sunxi_mmc_init(void)
+#else
+int putchar(int ch)
 {
 	return -1;
 }
 
-int status_led_set(void)
+int puts(const char *str)
+{
+	return -1;
+}
+
+int printf(const char *fmt, ...)
 {
 	return -1;
 }
+
+void uart_init(void)
+{
+}
+
+#endif