How come android headunits in a car boot up so fast despite being very under powered compared to phones these days ?
My car's android unit has some quad core processor , and it instantly boots up and reaches the home screen where as my phone takes almost 30 seconds or a minute to reach the home screen despite having much better hardware.
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One reason may be that they're not actually off when the ignition is off, they're just asleep like your phone is when the screen is off but it's still powered on.
That's exactly it.
The unit does restart about once every week and then goes back to suspend to ram.
You basically will never notice the restart unless you cut off power. And additionally drain all capacitors.
Yeah, I recall the one time I actually saw my head unit restart, it took a minute to boot up.