最近在做android BSP 4.2的时候遇到一个BUG，编译user 版本的时候，系统刷进手机里面去，无限循环在开机动画，编译userdebug 刷机进去的时候发现正常，于是我先回滚到正常的版本，进系统打开adb调试，然后刷异常的版本，发现无限循环的log如下
I/dalvikvm( 823): DexOpt: not all deps represented
E/dalvikvm( 823): /system/framework/android.test.runner.jar odex has stale
dependencies
为啥会出现这个BUG呢，看了一下git，发现我新增加的 FM收音机里面有一个qcom.fmradio.jar 这个并且做了如下处理
export BOOTCLASSPATH ${BOOTCLASSPATH}:/system/framework/changhong.jar
于是我google了一下错误信息，找到了一个相关帖子
https://groups.google.com/forum/#!topic/android-porting/jgJqrZ9uGXs
The optimized DEX files have inter-file dependencies. All .odex files
depend on the bootstrap class entries, so if you add or remove entries
from the bootclasspath you must re-run dexopt over all files.This happens automatically on -userdebug and -eng developer builds,
but -user builds don’t have the un-optimized versions of the APKs
sitting around. So it just falls over.The best plan is to leave bootclasspath alone.
See also dalvik/docs/dexopt.html in the source tree.
根据这个回答，我在build/core/dex_preopt.mk 里面找到了
DEXPREOPT_BOOT_JARS := core:core-junit:bouncycastle:ext:framework:telephony-common:voip-common:mms-common:android.policy:services:apache-xml
修改成：
DEXPREOPT_BOOT_JARS := core:core-junit:bouncycastle:ext:framework:telephony-common:voip-common:mms-common:android.policy:services:apache-xml:changhong
注意最后面那个。
删除out/target/product/device/system,重新编译打包，刷机，正常进入系统！！