编译uboot出错！

make uboot时出现这种错误
make[1]: *** No rule to make target `hello_world.srec', needed by `all'.
可以编辑u-boot/examples/Makefile
找到以下这几行，

$(obj)%.srec:   $(obj)%
                $(OBJCOPY) -O srec $< $@ 2>/dev/null

$(obj)%.bin:    $(obj)%
                $(OBJCOPY) -O binary $< $@ 2>/dev/null

改为：
$(obj)%.srec:   $(obj)%.o
                $(OBJCOPY) -O srec $< $@ 2>/dev/null

$(obj)%.bin:    $(obj)%.o
                $(OBJCOPY) -O binary $< $@ 2>/dev/null