Date: Sat, 6 Jan 2024 19:00:54 -0800 From: Mark Millard <marklmi@yahoo.com> To: bob prohaska <fbsd@www.zefox.net> Cc: Marcin Cieslak <saper@saper.info>, freebsd-arm@freebsd.org Subject: Re: USB-serial adapter suggestions needed Message-ID: <7D27DF9F-AA9A-4D44-BC28-8CC637D0F550@yahoo.com> In-Reply-To: <ZZoOMoM/iwcFqSNi@www.zefox.net> References: <ZZoOMoM/iwcFqSNi@www.zefox.net>
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> On Jan 6, 2024, at 18:36, bob prohaska <fbsd@www.zefox.net> wrote: >=20 > =EF=BB=BFOn Sat, Jan 06, 2024 at 11:44:49PM +0000, Marcin Cieslak wrote: >>> On Fri, 5 Jan 2024, Mark Millard wrote: >>>=20 >>> 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. >>=20 >> 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. >=20 > 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=E2=80=99s config.txt as its config.tx= t 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. >=20 >>=20 >> 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. >>=20 >> 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. >>=20 >=20 > Agreed, and I changed config.txt to set > dtoverly=3Ddisable-bt > on www.zefox.org (the console host) to force use of the PL011. > It didn't help detectably. >=20 >> 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. >=20 > 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. >=20 > 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 =E2=80=98s config.tx= t content or powerd status. Also, which type of RPi* ? > It'll be a day or so before buildworld finishes. >=20 > Thanks for writing! >=20 > bob prohaska >=20 >=20
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