[Bug 278716] ucom(4)/uslcom(4)/uchcom(4) serial driver: communcation problem with FBSD > 13.2-RELENG

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278716

O. Hartmann <ohartmann@walstatt.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|uslcom serial driver:       |ucom(4)/uslcom(4)/uchcom(4)
                   |communcation problem with   |serial driver: communcation
                   |FBSD > 13.2-RELENG          |problem with FBSD >
                   |                            |13.2-RELENG
          Component|kern                        |usb

--- Comment #2 from O. Hartmann <ohartmann@walstatt.org> ---
Another ESP32, this time with CH340 (uchcom(4)) chipset.
On the Fujitsu Esprimo D538, attached with a Micro-USB cabling, consecutive
connect attempts results in partial errors, while the CH340 seems to send at
least something, while CP2102/CP2104 seems to give me nothing (see PR report
above):

[...]
ohartmann@hebe:~ $ esptool.py --chip esp32 --baud 115200 --port /dev/cuaU0
read_mac
esptool.py v4.7.0
Serial port /dev/cuaU0
Connecting.......
Chip is ESP32-D0WD-V3 (revision v3.0)
Features: WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme
None
Crystal is 40MHz
MAC: XX:XX:XX:XX:XX:XX
Uploading stub...

A fatal error occurred: Invalid head of packet (0xAC): Possible serial noise or
corruption.
ohartmann@hebe:~ $ esptool.py --chip esp32 --baud 115200 --port /dev/cuaU0
read_mac
esptool.py v4.7.0
Serial port /dev/cuaU0
Connecting....................
Chip is ESP32-D0WD-V3 (revision v3.0)
Features: WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme
None
Crystal is 40MHz
MAC: XX:XX:XX:XX:XX:XX
Uploading stub...

A fatal error occurred: Invalid head of packet (0x00): Possible serial noise or
corruption.

ohartmann@hebe:~ $ esptool.py --chip esp32 --baud 115200 --port /dev/cuaU0
read_mac
esptool.py v4.7.0
Serial port /dev/cuaU0
Connecting.....
Chip is ESP32-D0WD-V3 (revision v3.0)
Features: WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme
None
Crystal is 40MHz
MAC: XX:XX:XX:XX:XX:XX
Uploading stub...
Running stub...
Stub running...
MAC: 9XX:XX:XX:XX:XX:XX
Hard resetting via RTS pin...
ohartmann@hebe:~ $ 
[...]

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