• 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 

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

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')