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by yjftsjthsd-h 2191 days ago
> A reboot is even faster, only 0.26 seconds from issuing the reboot to entering user space.

Curious; it doesn't say how that works. Could be kexec, but if it's a real reboot then I'd be interested to know why it's faster. Can you still skip some hardware initialization somehow?
2 comments
eerimoq 2191 days ago
I'm curious as well, and yes, by reboot I mean calling "reboot(RB_AUTOBOOT)". I was under the impression that the ROM code has to start over from the beginning, which I think it does. Maybe it can skip some initialization since the SoC is already up and running. Maybe there is some initial hardware setup that is only done at power on. It's hard to tell as this part of the boot sequence runs closed source NXP code.
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aappleby 2191 days ago
Soft boot doesn't have to read the bootloader from ROM again.
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