documentation boot mode?

Hi I can't find, where is boot mode message described.

rst cause:2, boot mode:(3,6) I can't find what this mean :frowning:
rst cause:2, boot mode:(2,6)

Thank you for help

What produces those messages?


What produces those messages?



this messages I see on serial console. (ESP8266 - Wemos D1 mini and LoLin (Node MCU board) )

I seen this messages
ets Jan 8 2013,rst cause:2, boot mode:(3,6)
or boot mode:(3,0)
or boot mode:(2,6)

but I can't find any description or documentation.

Sorry. I have never programmed an ESP8266.