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Thanks I'll put what I do know here too
Bear with me as I try to get it all here first then try to analyse it.

is the normal reset when power on and GPIO0 grounded.
So 1=001 or UART mode



This is from a while(1); statement so the wdt had more than a second with nothing happening.
So 3=011 or FLASH(running) mode


Is where it resets when ch_pd is shorted to reset
So 3=011 or FLASH(running) mode


So 1=001 or UART mode
This is put out when the GPIO16 pin deepsleep() command sends reset low through a capacitor


So 3=011 or FLASH(running) mode
Don't know what this one is yet

I came accross a bit more of the puzzle today

In the bootup message 'boot mode:(x,y)' three low bits of x are {MTDO(GPIO15), GPIO0, GPIO2}.

Not sure how that fits in but brackets are probably meant to indicate an array.

ets Jan 8 2013,rst cause:4, boot mode:(1,0)

would mean maybe 15=1,0=0,2=0?? Not getting a lot out of that yet

tytower wrote:

In the bootup message 'boot mode:(x,y)' three low bits of x are {MTDO(GPIO15), GPIO0, GPIO2}.

Not sure how that fits in but brackets are probably meant to indicate an array.

A concatenation, verilog-style.

tytower wrote:ets Jan 8 2013,rst cause:4, boot mode:(1,0)

GPIO15 == 0, GPIO0 == 0, GPIO2 == 1

I see thanks