Removing dependencies on /system

The dependencies to the Android /system folder include two parts:

• All kernel modules for device drivers are located at: $OUT/system/lib/modules/4.x.x-android-x86.
• We need to run some basic Linux commands during the recovery boot process. For example, we do hardware initialization using the following command:
  on init
  exec -- /system/bin/logwrapper /system/bin/sh /system/etc/init.sh

Let's work on the preceding two points one by one in the following sections.

Hardware initialization in recovery

To load the minimum device drivers needed by recovery, we have to change the execution of the shell script for Android system start. This is a customization process from general to specific, which is different from the goal of the Android...