Right sequense for flashing and burning e-fuses

[daniel-alsen]

Hi.

What is the right sequence and approach to flash an esp32-s3 device and then burn e-fuses as part of a continuous manufacturing flow, with as high automation as possible?

The hard reset via RTS seems to be critical after the flashing to get the device into boot mode. Otherwise I can't start the device after flashing, even if I pull EN low and try different combinations with IO0 (Boot). I also managed to get a device bricked after burning the efuses when the device was still in bootloader mode.

These are the eFuses I'm burning:

DIS_PAD_JTAG
DIS_USB_JTAG
DIS_DOWNLOAD_MODE

Can you please clarify a bit more about the "hard reset" sequence including RTS that esptool is doing?

How do I best sequence this and which mode should the device be in when burning the efuses, so it will boot safely afterwards?

Best,
Daniel