Android 11 无法remount问题

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本文针对Android11开发中遇到的remount失败问题进行了深入分析，并提供了详细的解决方案，包括如何禁用DM-Verity以允许系统分区的读写操作。

问题描述： 在Android 11开发的时候，想快速调试把单独编译好的模块push 到 /system 目录下，结果发现remount failed

C:>adb root
restarting adbd as root

C:>adb remount
Skipping /system for remount
Skipping /vendor for remount
Skipping /product for remount
No partitions to remount
remount failed

强行push 也是显示错误

 Z:framework> adb push .\framework.jar /system/
adb: error: failed to copy '.\framework.jar' to '/system/framework.jar': 
remote couldn't create file: Read-only file system
.\framework.jar: 1 file pushed, 0 skipped. 43.0 MB/s (29967488 bytes in 0.665s)

remote couldn't create file: Read-only file system

MTK解释： 原因是android P版本后google启用avb(Android Verified Boot)2.0，verified boot and DM-verity默认启用策略发生了变化。
DM-Verity behavior changes from vboot1.0 to avb2.0.
On vboot1.0, dm-verity is turned off on eng build and is enabled on userdebug/user build.
DM-verity could be disabled with adb (not fastboot) on userdebug build without unlocking device first.
DM-Verity could not be disabled on user build.
On avb2.0, dm-verity behavior are the same on all build variants.
It’s turned on by default and could only be disabled after device is unlocked.
dm-verity disable flag is moved from system image dm-verity metadata(vboot1.0) to vbmeta image(avb2.0), and you have two ways to disable it: adb and fastboot.

解决办法：

Android P + kernel-4.4 or kernel-3.18

download preloader with verified boot disabled which location is the same as scatter file //preloader_<PROJECT>_SBOOT_DIS.bin
adb root
adb disable-verity
adb reboot
adb root
adb remount

Android P + kernel-4.9 or after

1. download preloader with verified boot disabled which location is the same as scatter file. //preloader_<PROJECT>_SBOOT_DIS.bin
2.boot to Home Screen
3.go to setting -> system -> Developer options -> OEM unlocking
4.adb reboot bootloader
5.fastboot flashing unlock
6.press volume up key
7.fastboot reboot
8.adb root
9.adb disable-verity
10.adb reboot
11.adb root
12.adb remount

注意事项：

第一步需要先确认out目录有没有编译出preloader_<PROJECT>_SBOOT_DIS.bin 这个文件，是和下载时选择的Android_scatter.txt同级目录
如果没有这个文件，那么需要先在系统里找到对应BoardConfig.mk，
```
	ifneq ($(wildcard vendor/mediatek/internal/sboot_disable),)
	BOARD_BUILD_SBOOT_DIS:=yes
	else
	BOARD_BUILD_SBOOT_DIS:=no  // 把这个no 改为yes
	endif
```
把这个no 改为yes，然后重编烧录开机，之后再进行后面的步骤。
第三步是要在开发者模式里找到OEM unlocking 并打开

成功之后remount 是这样

	Z:> adb remount
	Using overlayfs for /system
	Using overlayfs for /vendor
	Using overlayfs for /product
	Now reboot your device for settings to take effect
	remount succeeded

总结： android 真的好难呀！