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
