[RK3288][Android6.0] 调试笔记 --- user版本串口只有输出不能输入

Platform: ROCKCHIP

OS: Android 6.0

Kernel: 3.10.92

现象:

编译成user版本之后串口只有输出没有输入.

原因:

编译user版本之后 ro.debuggable=0
build/core/main.mk:

ifeq (true,$(strip $(enable_target_debugging)))

  # Target is more debuggable and adbd is on by default

  ADDITIONAL_DEFAULT_PROPERTIES += ro.debuggable=1

  # Enable Dalvik lock contention logging.

  ADDITIONAL_BUILD_PROPERTIES += dalvik.vm.lockprof.threshold=500

  # Include the debugging/testing OTA keys in this build.

  INCLUDE_TEST_OTA_KEYS := true

else # !enable_target_debugging

  # Target is less debuggable and adbd is off by default

  ADDITIONAL_DEFAULT_PROPERTIES += ro.debuggable=0

endif # !enable_target_debugging

system/core/rootdir/init.rc

service console /system/bin/sh

    class core

    console

    disabled

    user shell

    group shell log

    seclabel u:r:shell:s0

on property:ro.debuggable=1

    start console

可见console是否启动受属性ro.debuggable的控制.

解决方法:

1. 修改 ro.debuggable = 1

2. 直接将disabled移除,默认无条件启动console.

参考:
http://blog.csdn.net/buaaroid/article/details/32714041