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Hermes SMTP Server) with ESMTPA ID 28e98d4fefcfe714b4e0a9c5891f964d; Wed, 27 Dec 2023 08:30:37 +0000 (UTC) Content-Type: text/plain; charset=utf-8 List-Id: Porting FreeBSD to ARM processors List-Archive: https://lists.freebsd.org/archives/freebsd-arm List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-arm@freebsd.org Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3774.300.61.1.2\)) Subject: Re: USB-serial adapter suggestions needed From: Mark Millard In-Reply-To: Date: Wed, 27 Dec 2023 00:30:26 -0800 Cc: ticso@cicely.de, Marcin Cieslak , freebsd-arm@freebsd.org Content-Transfer-Encoding: quoted-printable Message-Id: References: <16864054-4os0-pq3p-7qp0-7299666908os@fncre.vasb> <55q37289-ss30-nq9o-7r31-086n999p394s@fncre.vasb> To: bob prohaska X-Mailer: Apple Mail (2.3774.300.61.1.2) X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[]; ASN(0.00)[asn:36647, ipnet:98.137.64.0/20, country:US] X-Spamd-Bar: ---- X-Rspamd-Queue-Id: 4T0Pwg3R7Wz3VnH On Dec 26, 2023, at 18:09, bob prohaska wrote: > On Tue, Dec 26, 2023 at 02:06:59AM +0100, Bernd Walter wrote: >> On Tue, Dec 26, 2023 at 12:02:50AM +0000, Marcin Cieslak wrote: >>> On Sun, 24 Dec 2023, bob prohaska wrote: >>>=20 >>>> I do see what looks like noise on the serial lines, but only after = a spontaneous >>>> disconnect and only with FTDI adapters. When the serial connections = are working >>>> nothing resembling noise is seen. >>>=20 >>> How does that noise look like? >>=20 > It appears to be non-ascii. I can't get it to copy and paste in a way > that's recognizable to me, but here's a sample anyway, taken from > bob@pelorus:~ % uname -a > FreeBSD pelorus 14.0-RELEASE-p4 FreeBSD 14.0-RELEASE-p4 #0 = releng/14.0-n265400-4edf3b80733e: Wed Dec 27 20:21:26 PST 2023 = bob@pelorus:/usr/obj/usr/src/arm64.aarch64/sys/GENERIC arm64: > ....... > # tip ucom > connected >=20 > FreeBSD/arm64 (www.zefox.org) (ttyu1) >=20 > login: =EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF= =BF=BD > Password: > Login incorrect > .......... >=20 > The backslash letter pairs are clearly different, but they're = displayed on a > RasPiOS lxterminal window as a white oval with a dark question mark in = the middle. It shows that way in some programs but not others in my context. But what matters is the byte sequence, not the potentially false interpretations of them. In a program that shows hexadecimal byte values and the printable text (with "." for control characters and for 8-bit characters on the right below): 0000: 6C 6F 67 69 6E 3A 20 C3 AF C2 BF C2 BD C3 AF C2 login: ......... 0010: BF C2 BD C3 AF C2 BF C2 BD C3 AF C2 BF C2 BD C3 ................ 0020: AF C2 BF C2 BD C3 AF C2 BF C2 BD C3 AF C2 BF C2 ................ 0030: BD C3 AF C2 BF C2 BD 0A 50 61 73 73 77 6F 72 64 ........Password 0040: 3A : The byte pairs that start with C3 's and C2's look far from random to me --also they do not look like glitches. (Of course, I'm not looking at original files.) > Sometimes printable characters show up, but it doesn't look like my = memory > of a baudrate mismatch on a serial modem. Maybe that's just an = artifact of > modern character sets. =3D=3D=3D Mark Millard marklmi at yahoo.com