Build

• features

  • wifi
  • gsm (call in / call out / hangout)
  • egl
  • sound
  • camera
  • BT
  • sensors

• init

    # repo init -u git://github.com/CyanogenMod/android.git -b cm-12.1
    
    # repo sync
    
    # source build/envsetup.sh
    
    # lunch cm_rainbow-eng
  

• recoveries

    # . build/tools/device/makerecoveries.sh cm_rainbow-eng
  
    # mka bootimage
  

• full build

    # brunch cm_rainbow-eng
  

MTK

Few words about mtk related binaries, services and migration peculiarities.

Limitations

Services requires root:

system/core/rootdir/init.rc

• surfaceflinger depends on sched_setscheduler calls, unable to change process priority from 'system' user (default user 'system')

• mediaserver depends on /data/nvram folder access, unable to do voice calls from 'media' user (default user 'media')