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Date:      Sat, 04 May 2024 08:16:36 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 278716] uslcom serial driver: communcation problem with FBSD > 13.2-RELENG
Message-ID:  <bug-278716-227-xwnhrz7TZ1@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-278716-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-278716-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D278716

--- Comment #1 from O. Hartmann <ohartmann@walstatt.org> ---
Addendum: I ordered ESP32 with CH340 UART to verify my observations with
uslcom(4) and CP2102 or CP2104 UARTs on devices I use. I'll report.

Also I'm inclined to install a Lenovo T560 notebook with FBSD 13.2, 14.0 and
14.1-PRERELEASE to check, whether the problem persists and were the
"terminator" might reside.

In the meanwhile I tried to move to Linux, Xubuntu 24.04 LTS to be specific=
 and
used the convenient ESP-IDF installation for quick testing.

Using the very same cabling, ESP32s test platforms, Xubuntu had out of 20
attempts of connections with esptool (taken from the IDF 5.1.3, which seems=
 to
be 4.7.0 as the FreeBSD's port) one failure on the hardware platform Lenovo
T560 to connect. In all other cases connection was established.

My skills regarding FreeBSD's internal serial system are very limited, but =
if I
can provide some more details while setting up the test platforms please
contact me - and be patient, try to get to it as soon as possible.

--=20
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