Re: USB-serial adapter suggestions needed

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:
>> 
>> Overall I've not been able to understand what the
>> (various?) hypothesized stage-by-stage byte flow
>> paths are in these notes.
>> 
> 
> Maybe this will help. The path is
> 
> workstation> Ethernet > terminal server:usb-serial > serial wires> GPIO 8/10
> 
> I hesitated to use the words "terminal server" because that has implications
> (distinct IP address, multiple serial interfaces) that don't exist here. 
> 
> 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 
> 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 
uses in config.txt:
b@www:/boot/msdos % more config.txt
init_uart_clock=3000000
enable_uart=1
kernel=u-boot.bin
kernel7=u-boot.bin
dtoverlay=mmc
force_mac_address=b8:27: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=1 . (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=1
dtparam=audio=on,i2c_arm=on,spi=on
dtoverlay=mmc
dtoverlay=disable-bt
device_tree_address=0x4000
kernel=u-boot.bin

which has the full-function UART for its serial console
and is using arm_64bit=1 .

Why the variation?

===
Mark Millard
marklmi at yahoo.com