android 几个快速编译images指令

ndroid比较重要的三个img文件：
make systemimage - system.img
make userdataimage -userdata.img
make ramdisk - ramdisk.img
make snod - 快速打包system.img (with thiscommand, it will build a new system.img very quickly. well, youcannot use “make snod” for all the situations. it would not checkthe dependences.
if you change some code in the framework whichwill effect other applications)

因為

system.img 是 從 out/target/product/xxxx/system 做出來的。

如果改了 這個 folder 的內容，想要重新產生 system.img。不要管 system folde 裡面的 file 的dependency，可以用 snod 這個 target:
make snod

定義在build/core/Makefile 可以看到 snod 這個 target:

(有說明是： make system.img ignoring depencies)

.PHONY: systemimage-nodepssnod

systemimage-nodeps snod: $(filter-out systemimage-nodepssnod,$(MAKECMDGOALS)) \

| $(INTERNAL_MKUSERFS)

@echo "make $@: ignoring dependencies"

$(call build-systemimage-target,$(INSTALLED_SYSTEMIMAGE))

$(hide) $(callassert-max-image-size,$(INSTALLED_SYSTEMIMAGE),$(BOARD_SYSTEMIMAGE_PARTITION_SIZE),yaffs)

Ref:
http://hi.baidu.com/kyan/blog/item/df7ea8d346f5c839960a163c.html
http://r40eubuntu.blogspot.com/2010/10/systemimg.html