RK 默认root、User版本编译

一.默认root

1. adb shell 默认root
在build/core/main.mk下将ADDITIONAL_DEFAULT_PROPERTIES += ro.secure=1
改成ADDITIONAL_DEFAULT_PROPERTIES += ro.secure=0
2.挂载分区device\rockchip\rk3399\fstab.rk30board.bootmode.emmc
system 由 ro 改成 rw

二.补丁

diff --git a/build/core/main.mk b/build/core/main.mk
index a6b2544..98d0549 100755
--- a/build/core/main.mk
+++ b/build/core/main.mk
@@ -393,7 +393,7 @@ enable_target_debugging := true
 tags_to_install :=
 ifneq (,$(user_variant))
   # Target is secure in user builds.
-  ADDITIONAL_DEFAULT_PROPERTIES += ro.secure=1
+  ADDITIONAL_DEFAULT_PROPERTIES += ro.secure=0
   ADDITIONAL_DEFAULT_PROPERTIES += security.perf_harden=1
 
   ifeq ($(user_variant),user)
diff --git a/device/rockchip/rk3399/fstab.rk30board.bootmode.emmc b/device/rockchip/rk3399/fstab.rk30board.bootmode.emmc
index 8668a0f..b40ba17 100755
--- a/device/rockchip/rk3399/fstab.rk30board.bootmode.emmc
+++ b/device/rockchip/rk3399/fstab.rk30board.bootmode.emmc
@@ -3,7 +3,7 @@
 # The filesystem that contains the filesystem checker binary (typically /system) cannot
 # specify MF_CHECK, and must come before any filesystems that do specify MF_CHECK
 
-/dev/block/platform/fe330000.sdhci/by-name/system         /system             ext4      ro,noatime,nodiratime,noauto_da_alloc                                  wait,resize
+/dev/block/platform/fe330000.sdhci/by-name/system         /system             ext4      rw,noatime,nodiratime,noauto_da_alloc                                  wait,resize
 # use this line below instead to enable verity
 #/dev/block/platform/fe330000.sdhci/by-name/system         /system             ext4      ro,noatime,nodiratime,noauto_da_alloc                                  wait,check,verify
 /dev/block/platform/fe330000.sdhci/by-name/cache          /cache              ext4      noatime,nodiratime,nosuid,nodev,noauto_da_alloc,discard                wait,check

default.prop

#
# ADDITIONAL_DEFAULT_PROPERTIES
#
ro.secure=0
ro.allow.mock.location=0
ro.debuggable=1
ro.zygote=zygote32
ro.enable_boot_charger_mode=0
dalvik.vm.dex2oat-Xms=64m
dalvik.vm.dex2oat-Xmx=512m
dalvik.vm.image-dex2oat-Xms=64m
dalvik.vm.image-dex2oat-Xmx=64m
ro.dalvik.vm.native.bridge=0
persist.sys.usb.config=adb

 三.daemonsu 开启root 服务

out\target\product\rk3288\root\init.rc

service daemonsu /system/xbin/daemonsu --auto-daemon
    class main

 四.unroot 编译user版本 注意busybox工具

diff --git a/vendor/rockchip/common/bin/Android.mk b/vendor/rockchip/common/bin/Android.mk
old mode 100644
new mode 100755
index e58759f..3450150
--- a/vendor/rockchip/common/bin/Android.mk
+++ b/vendor/rockchip/common/bin/Android.mk
@@ -6,7 +6,7 @@ LOCAL_PATH := $(call my-dir)
 #ifeq ($(strip $(TARGET_ARCH)), arm)
 
 ###############################################################################
-ifneq (,$(filter userdebug eng,$(TARGET_BUILD_VARIANT)))
+ifneq (,$(filter userdebug user eng,$(TARGET_BUILD_VARIANT)))
 # busybox
 include $(CLEAR_VARS)
 LOCAL_MODULE := busybox
diff --git a/vendor/rockchip/common/bin/bin.mk b/vendor/rockchip/common/bin/bin.mk
old mode 100644
new mode 100755
index 13df1ad..db24e88
--- a/vendor/rockchip/common/bin/bin.mk
+++ b/vendor/rockchip/common/bin/bin.mk
@@ -12,7 +12,7 @@ PRODUCT_PACKAGES += \
 
 endif
 
-ifneq (,$(filter userdebug eng,$(TARGET_BUILD_VARIANT)))
+ifneq (,$(filter userdebug user eng,$(TARGET_BUILD_VARIANT)))
 PRODUCT_PACKAGES += \
 	busybox
 endif

　默认的目标构建变体(TARGET_BUILD_VARIANT)为 userdebug。常用变体有三种，分别是用户(user)、用户调试(userdebug)和工程模式(eng)