Public bug reported:
the esp8266 development boards like wemos D1 mini have an integrated
usb-uart converter which allows to flash/monitor/debug the esp8266 by
usb cable and a tool called esptool on linux, which is either standalone
(esptool package) or integrated into some IDE (platformio + visio)
dmesg output:
[ 46.614510] usbcore: registered new interface driver usbserial_generic
[ 46.614523] usbserial: USB Serial support registered for generic
[ 46.615912] usbcore: registered new interface driver ch341
[ 46.615925] usbserial: USB Serial support registered for ch341-uart
[ 46.615938] ch341 1-9:1.0: ch341-uart converter detected
[ 46.616332] usb 1-9: ch341-uart converter now attached to ttyUSB0
This convenient flashing method worked without issues up to kernel
5.11.0-36-generic and stopped working with 5.11.0-37-generic. The issue
remains the same whether I use the esptool package or the version
bundled with platformio,
>> esptool --chip esp8266 --port /dev/ttyUSB0 --baud 115200 write_flash 0x0000
>> firmware.bin
esptool.py v2.8
Serial port /dev/ttyUSB0
Connecting........_____....._____....._____....._____....._____....._____....._____
A fatal error occurred: Failed to connect to ESP8266: Timed out waiting
for packet header
The communication to the esp8266 still seems to work, but the flash process
includes some additional DTR/RTS magic in the beginning to switch the esp into
flash mode before transmitting the data. My impression is that this DTR/RTS
process might be broken. I can flash an esp with an external UART (some dongle)
and manually triggering the flash mode. I tried with several cables, esps, ...
Booting the older kernel (5.11.0-36-generic) solves the issue ... There
seems to be an update to the ch341 from kernel -36 to -37, but it is
beyond my knowledge whether there is any connection.
Description: Ubuntu 20.04.3 LTS
Release: 20.04
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.11.0-37-generic 5.11.0-37.41~20.04.2
ProcVersionSignature: Ubuntu 5.11.0-37.41~20.04.2-generic 5.11.22
Uname: Linux 5.11.0-37-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.20
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Wed Oct 6 14:59:58 2021
InstallationDate: Installed on 2020-08-29 (403 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
SourcePackage: linux-signed-hwe-5.11
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: linux-signed-hwe-5.11 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal third-party-packages
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https://bugs.launchpad.net/bugs/1946231
Title:
esp8266 flashing stopped working with kernel 5.11.0-37-generic (ch341)
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