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Date: Tue, 24 Oct 2023 09:41:00 -0700
From: bob prohaska <fbsd@www.zefox.net>
To: Warner Losh <imp@bsdimp.com>
Cc: "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org>
Subject: Re: ucom debug not working on releng/14
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On Tue, Oct 24, 2023 at 09:43:53AM -0600, Warner Losh wrote:
> I thought that was a loader tuneable... have you tried it there?
> 

It works on arm64 (Pi3 and Pi4) in sysctl.conf.

Adding
hw.usb.ucom.debug="1"
to /boot/loader.conf doesn't seem to make any difference, during
boot the armv7 releng/14 host still reports 
sysctl: unknown oid 'hw.usb.ucom.debug' at line 10

I should have stated that it works on -current with Pi3 and Pi4
but does not work on Pi2 (armv7) with stable/12 and releng/14.
There's presently no -current armv7 host to test.

Thanks for writing!

bob prohaska


> Warner
> 
> On Tue, Oct 24, 2023, 9:34 AM bob prohaska <fbsd@www.zefox.net> wrote:
> 
> > A Pi2 running armv7 releng/14 reports
> >
> > sysctl: unknown oid 'hw.usb.ucom.debug' at line 10
> >
> > when booting.
> >
> > The intent was to understand why it drops ssh connections
> > when they are used to communicate with an ftdi usb-serial
> > adapter.  A few other hosts running -current accept the
> > debug setting and generate copious output in response.
> >
> > Man pages suggest the option is available on stable,
> > -current and releng/, but it seems to actually work
> > only on -current, at least for armv7.
> >
> > Thanks for reading, and any hints what might be done wrong.
> >
> > bob prohaska
> >
> >
> >