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By piersfinlayson
#62674
SlowBro wrote:As the title says.


You're going to have to be more specific.

The ESP8266's ROM bootloader will boot the application stored in the default location on flash pretty much instantaneously upon application of power (and the correct GPIO states).

I have a modified secondary bootloader in flash that then goes on and boots my application code. This is also very fast (milliseconds) if I remove the 2s sleep I have in my bootloader.

But you may mean boot time for nodemcu or Arduino, or some other platform to run a bunch of code.
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By SlowBro
#62697 Prefer Arduino but I'll take whatever info you have about non-custom bootloaders.

Approximately how many microseconds is "instantaneously"?

I'd like to know this because I'm considering building an ESP-NOW-only device.