复杂模板

start server M4_state

do not start camera&display

First Stage

NOTE: the default evs display hal is based on the suraceflinger. we may need to rewrite the display hal.

start evs server

insmod camera.ko&display.ko in early-init stage

Fourth Stage

no camera&display detected

Third Stage

Linux Driver loader

no response from A core. Start camera&display

reverse signal detected

Linux & Android

send fourth stage

Start camera&display

M4 image

send Third stage

android boot complete

Second Stage

check camera&display state

send Secnd stage