This news item is interesting, tho the P2 will miss the window, it does show what markets exist, and the importance of rapid booting.
Plenty of after-market, and related market uses here.
USA: "The FMVSS-111 law requires that all new vehicles sold in the U.S., beginning in May 2018, have rearview backup cameras and the rear camera video must display in less than two seconds after the driver places the vehicle into reverse gear."
& Exar claim "displaying live video with graphics overlay in less than 0.5 seconds after vehicle ignition."
and this shows why ever-larger-ARMs-running OS are not the solution...
" Today's head units are prone to operating system (OS) software freezes and hang-ups that display a frozen image or prevent the rear camera from displaying live video. With SoCs running increasingly complex operating systems, software freezes and hang-ups are more common."