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Subject: Re: USB-serial adapter suggestions needed
From: Mark Millard <marklmi@yahoo.com>
In-Reply-To: <ZY3LWKmCPvmLZvzU@www.zefox.net>
Date: Thu, 28 Dec 2023 12:38:58 -0800
Cc: John F Carr <jfc@mit.edu>,
"ticso@cicely.de" <ticso@cicely.de>,
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"freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org>
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To: bob prohaska <fbsd@www.zefox.net>
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On Dec 28, 2023, at 11:24, bob prohaska <fbsd@www.zefox.net> wrote:
> On Wed, Dec 27, 2023 at 12:27:33PM -0800, Mark Millard wrote:
>>=20
>> Overall I've not been able to understand what the
>> (various?) hypothesized stage-by-stage byte flow
>> paths are in these notes.
>>=20
>=20
> Maybe this will help. The path is
>=20
> workstation> Ethernet > terminal server:usb-serial > serial wires> =
GPIO 8/10
>=20
> I hesitated to use the words "terminal server" because that has =
implications
> (distinct IP address, multiple serial interfaces) that don't exist =
here.=20
>=20
> The workstation is a RasPiOS Pi4, the Pi3 host called pelorus is the =
terminal
> server and the GPIO pins are on the Pi3 host named www.zefox.net .
Your prior messages reported text referencing .org, such as:
FreeBSD/arm64 (www.zefox.org) (ttyu1)
and:
No, the garbled login prompt originates from www.zefox.org's
serial console.
and:
Understood, it's been hard to articulate 8-( Maybe
Workstation > ethernet > pelorus > usb port > gpio 8,10 > console =
www.zefox.org
is a little clearer
So: "www.zefox.net <http://www.zefox.net/>" above is a change of report, =
if I understand
right.
> The Ethernet connection works well enough for all the other hosts =
that I think=20
> we can disregard whether it's wired or WiFi and LAN or WAN or all =
four.
You have also reported that:
The Pi3 which reported the garbled login prompt=20
uses in config.txt:
b@www:/boot/msdos % more config.txt
init_uart_clock=3D3000000
enable_uart=3D1
kernel=3Du-boot.bin
kernel7=3Du-boot.bin
dtoverlay=3Dmmc
force_mac_address=3Db8:27:eb:71:46:4f
This is using the mini-uart for the serial console and the
full-function UART for bluetooth. It also is not using
arm_64bit=3D1 . (So armv7 support instead of aarch64 support?)
https://elinux.org/RPi_Serial_Connection claims:
QUOTE
. . . the less capable mini-UART with no break detection, no framing =
errors
detection, no parity bit, no receive timeout interrupt and no DCD, DSR,
DTR or RI signals
END QUOTE
This contrasts with:
The Pi3 hosting the usb-serial adapter has in config.txt
bob@pelorus:~ % more /boot/efi/config.txt
[all]
arm_64bit=3D1
dtparam=3Daudio=3Don,i2c_arm=3Don,spi=3Don
dtoverlay=3Dmmc
dtoverlay=3Ddisable-bt
device_tree_address=3D0x4000
kernel=3Du-boot.bin
which has the full-function UART for its serial console
and is using arm_64bit=3D1 .
Why the variation?
=3D=3D=3D
Mark Millard
marklmi at yahoo.com