it seems that the most important bugfix that 3.0 has, compared to 2.8, is that it's upstream and thus not implicitly sets the --no-stub flag by default. This is bad because some boards require it.

TinyPICO:

$ PYTHONPATH=. python3 ./esptool.py  flash_id

esptool.py v3.1-dev

Found 3 serial ports

Serial port /dev/ttyUSB0

Connecting......

Detecting chip type... ESP32

Chip is ESP32-PICO-D4 (revision 1)

Features: WiFi, BT, Dual Core, 240MHz, Embedded Flash, VRef calibration in 
efuse, Coding Scheme None

Crystal is 40MHz

MAC: d8:a0:1d:54:76:20

Uploading stub...

Running stub...

Stub running...

Manufacturer: c8

Device: 4016

Detected flash size: 4MB

Hard resetting via RTS pin...


$ PYTHONPATH=. python3 ./esptool.py --no-stub  flash_id

esptool.py v3.1-dev

Found 3 serial ports

Serial port /dev/ttyUSB0

Connecting....

Detecting chip type... ESP32

Chip is ESP32-PICO-D4 (revision 1)

Features: WiFi, BT, Dual Core, 240MHz, Embedded Flash, VRef calibration in 
efuse, Coding Scheme None

Crystal is 40MHz

MAC: d8:a0:1d:54:76:20

Enabling default SPI flash mode...

Manufacturer: ff

Device: ffff

Detected flash size: Unknown

Hard resetting via RTS pin...


--
-- Matthias Urlichs

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