Re: USB-serial adapter suggestions needed

> On Jan 6, 2024, at 18:36, bob prohaska <fbsd@www.zefox.net> wrote:
> 
> On Sat, Jan 06, 2024 at 11:44:49PM +0000, Marcin Cieslak wrote:
>>> On Fri, 5 Jan 2024, Mark Millard wrote:
>>> 
>>> I also request to again list the exact content of the two
>>> config.txt files --and again every time they are changed during
>>> this investigation.
>> 
>> I second this. There is way too much text in this conversation
>> and not enough data. It also does not help if every system is somewhat
>> different.
> 
> Unfortunately, the systems simply are different. Four Pi2

Please differentiate RPi2B v1.1 (armv7) from v1.2 (aarch64).

I suggest armv7 use the snapshot armv7’s config.txt as its config.txt prefix.

> , two Pi3,
> one Pi4. I'll try to make the config.txt files on the Pi3s match
> better when the present experiment is complete. The interconnection
> of hosts is unique and, apparently, unusual. Not all of that is
> relevant, but exatctly what part isn't yet obvious.
> 
>> 
>> I have skimmed the peripherial documentation for one of the Broadcom
>> chips (I think the one from Raspberry Pi 3) and it says that
>> the speed of the mini uart depends on the CPU clock frequency.
>> 
>> I could imagine a situation when mini uart speed changes during
>> downlocking the CPU.  There was suggestion to not use mini uart.
>> Use the port where the frequency is not changing with the weather.
>> 
> 
> Agreed, and I changed config.txt to set
> dtoverly=disable-bt
> on www.zefox.org (the console host) to force use of the PL011.
> It didn't help detectably.
> 
>> I don't know how smart is the power management with powerd, but
>> I could also imagine shutting down peripherials or stopping the UART
>> clock as a potential power saving feature, so here you are.
> 
> No sign of that, but Mark posited that powerd might be causing
> trouble with the terminal server (pelorus in this test). That
> looks like a possibility. At the moment pelorus is without
> powerd and it's holding a serial connection to www.zefox.org.
> 
> Meanwhile www.zefox.org is running powerd and buildworld
> while being a terminal server to a Pi4 named nemesis.zefox.com
> That connection has dropped twice so far today.

Interesting. You have not reported on nemesis.zefox.com ‘s config.txt content or powerd status. Also, which type of RPi* ?

> It'll be a day or so before buildworld finishes.
> 
> Thanks for writing!
> 
> bob prohaska
> 
>