章节之外：makefile中的函数定义
?build-userimage-ext2-target的调用：include external/genext2fs/Config.mkifeq ($(TARGET_SYSTEMIMAGES_USE_EXT3),true)## generate an ext3 image# $(1): output filedefine build-radioimage-target @echo "Target radio fs image: $(1)" $(call build-userimage-ext2-target,$(1),$(2),radio,journal)endefelse # TARGET_SYSTEMIMAGES_USE_EXT3 != true$(error Radio does not support yaffs!)endif?
