[RK3399][Android7.1] 调试笔记 --- FwFactoryTool_v5.50_20190306拆包打包工具烧录后黑屏

Platform: RK3399-MID
OS: Android 7.1.2
Kernel: v4.4.83

问题：

FwFactoryTool可以提供给客户自主拆包，修改kernel logo 、开机动画、以及一些版本号等等再重新打包成update.img镜像包等；有客户反馈烧录了用工具生成的update.img镜像包，无法正常开机，画面黑屏；

问题日志：

[    2.774201] init: property 'ro.serialno' doesn't exist while expanding '${ro.                                                                                                             serialno}'
[    2.774998] init: write: cannot expand '${ro.serialno}'
[    2.775516] init: property 'ro.product.manufacturer' doesn't exist while expa                                                                                                             nding '${ro.product.manufacturer}'
[    2.776447] init: write: cannot expand '${ro.product.manufacturer}'
[    2.777060] init: property 'ro.product.model' doesn't exist while expanding '                                                                                                             ${ro.product.model}'
[    2.777875] init: write: cannot expand '${ro.product.model}'
[    2.780783] file system registered
[    2.783625] using random self ethernet address
[    2.784067] using random host ethernet address
[    2.784558] init: write_file: Unable to open '/config/usb_gadget/g1/functions                                                                                                             /rndis.gs4/wceis': Permission denied
[    2.794222] init: cannot find '/system/bin/sh' (No such file or directory), d                                                                                                             isabling 'console'
[    2.795212] init: Starting service 'adbd'...
[    2.796133] resource = 4, RLIM_NLIMITS = 16 pid = 1 tgid = 1
[    3.760735] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[    4.761312] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[    5.761893] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[    6.762475] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[    7.763058] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[    8.763442] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[    9.764026] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[   10.764607] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[   11.765188] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[   12.765772] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[   13.021772] read descriptors
[   13.021918] read descriptors
[   13.021944] read strings
[   13.766354] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[   14.766932] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[   15.767513] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[   16.768097] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[   17.768689] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[   18.769270] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[   19.769850] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[   20.426480] do_delay_timer init level = 0, is_delay = 1 **************
[   20.426615] pull up GPIO gpio_mute success
[   20.770431] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[   21.771013] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[   22.771594] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[   23.772178] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[   24.772745] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[   25.773388] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[   26.773980] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[   27.774561] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[   28.775145] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[   29.775725] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[   30.776384] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[   31.776968] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[   32.777550] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[   33.778132] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[   34.778713] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[   35.779301] binder: 196:196 transaction failed 29189/0, size 0-0 line 2868
[   36.043216] random: nonblocking pool is initialized

解决方法：

看到FWFactoryTool5.50 使用手册有一项注意事项：

修改文件： build//target/product/verity.mk

diff --git a/target/product/verity.mk b/target/product/verity.mk
old mode 100644
new mode 100755
index 0badb9f..2c45250
--- a/target/product/verity.mk
+++ b/target/product/verity.mk
@@ -20,7 +20,7 @@
 user_variant := $(filter user userdebug,$(TARGET_BUILD_VARIANT))
 ifneq (,$(user_variant))
     PRODUCT_SUPPORTS_BOOT_SIGNER := true
-    PRODUCT_SUPPORTS_VERITY := true
+    PRODUCT_SUPPORTS_VERITY := false
     PRODUCT_SUPPORTS_VERITY_FEC := true

     # The dev key is used to sign boot and recovery images, and the verity

 修改完确实可以进系统了，但是我到RK3288的源码上查看相同的地方，RK3288相同的地方还是true，为什么RK3288可以拆包打包并正常进系统呢？

参考：

Android 中的dm-verity

Android dm-verity 实现原理深入研究

最后

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