Thanks, William. Yeah, it could be from hibernate, but I don't think so:
https://www.youtube.com/watch?v=4Fjfqz6FxC8
And it looks like it's 3 seconds power-to-app. I can probably live with that.
> On Jun 7, 2015, at 15:38 , William Hermans <[email protected]> wrote:
>
> I would think hard coding into the main DTB would add time. A couple ways to
> think about it would be you *could* theoretically in userspace after the
> board has booted. Then systemd is supposed to be better at parallel tasks
> when booting compared to SYSV. Which again *could* mean that keeping things
> seperate could lead to faster boot times.
>
> With all that said. You could test it yourself. There is a systemd command
> that allows you to see how long things take to load during boot.
>
> https://wiki.archlinux.org/index.php/Improve_boot_performance
>
> Also I find it difficult in believing that the rPI can boot any faster than a
> BBB. That 1 second "boot time" was probably hibernate . . . suspend ram to
> disk, or whatever it is called on Linux.
>
> On Sun, Jun 7, 2015 at 2:48 PM, Rick Mann <[email protected]> wrote:
> I'm working on reducing the boot time (power on to my C user code running) as
> much as possible. I've seen demonstrations of an RPi booting in under 1
> second.
>
> Does anyone have any idea how much overhead is introduced by the DTB
> processing? If I were to remove the DTB support in a custom kernel, and
> hard-code all the necessary peripherals, how much time could I theoretically
> shave off the boot?
>
> It's probably not worth all that effort, but if DTB processing adds two
> seconds to the boot, it's worth considering. If the overhead is negligible
> compared to doing it without, that's valuable information, too.
>
> Thanks,
>
> --
> Rick Mann
> [email protected]
>
>
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