Flashing over JTAG would be really neat. Using 2 cables is not fancy .
@ESP_Angus: do you see this could be implemented in near future? I think it would help the platform to become mature and allow users to easier catch all this possible nasty bugs thata could happen during devel cycle.

We know wifi is critical for working - couldn't we somehow dedicate wifi to run on first core and user program on another?
Is rtos mixing first and second core for all task including user tasks and wifi tasks?

Why they mark GPIO11 when it is flash reserved? Ughh... So basically all this SD_ pins fall under same flash operation pins that user could not use since then flash would be useless? SHD/SD2 17 GPIO9, SD_DATA2, SPIHD, HS1_DATA2, U1RXD SWP/SD3 18 GPIO10, SD_DATA3, SPIWP, HS1_DATA3, U1TXD SCS/CMD 19 G...

Oh that's a shame - I just followed pinout picture and pin11 is indeed shared for flash and gpio... But if gpio could not be used - why put it on this image? https://www.google.si/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwi3__z9wb_QAhWH1xQKHVDxCY0QjRwIBw&url=https%3A%2F%2F...

Another question - I added led to my board to pin no 11.
I uploaded sketch, and I barely see led light instead of bright flashes - When I measured voltage on gpio11 - it shows 1.57V.

So what's wrong with using: in blink example?

Turned out I had faulty usb - serial ttl adapter. I picked new one and here is scope trace of io0 and en line: IMG_20161120_215540.jpg and result from arduino ide: Sketch uses 102,069 bytes (9%) of program storage space. Maximum is 1,044,464 bytes. Global variables use 9,160 bytes (3%) of dynamic me...

Unfortunately I do not have another FTDI - only bus pirate (http://dangerousprototypes.com/docs/Bus_Pirate) - maybe I could use it. But I think main problem here is that EN doesn't go fully to 0V to make reset - however I see io0 to go to 0V and then back to 3.3V - so this makes me believe something...

Oh and regarding rts and cts disabling in miniterm - I tried various combinations for:
in c:\Program Files (x86)\Arduino\hardware\espressif\esp32\boards.txt file.

I checked official devc from espressif and there is "Auto program" table in schematics it says: dtr=0, rts=1 --> en==1, io0=0 so this is what I am getting, but still in arduino esp32 - I get: Global variables use 9,160 bytes (3%) of dynamic memory, leaving 285,752 bytes for local variables. Maximum ...

OK, after all I decided to use NPN transistors, but have problem with flashing esp32. It seems that EN line does not fully transition from 3.3V to 0V (check scope screenshot of yellow line that represents EN). However blue line that represents IO0 does a full transition from 3.3V to 0V - so any idea...