Re: Boot stops at loader after build/install cycle

Also, the sequence looks like the terminal is reporting something, maybe
focus?. That's why it's regular. Though I can't find a sequence that ends
in R.

Warner

On Wed, Mar 29, 2023, 7:09 PM Steve Rikli <sr@genyosha.net> wrote:

> On Thu, Mar 30, 2023 at 12:24:13AM +0000, Marcin Cieslak wrote:
> > On Wed, 29 Mar 2023, bob prohaska wrote:
> >
> > > If not maybe try  different hardware (cables, usb-serial adapters,
> > > power supplies and so on) with an eye to any changes of behavior.
> > > At this stage making the problem worse might be more useful than
> > > making it better. Disconnecting the serial-end ground might be
> > > worth a try. If the connection still works it suggests you have
> > > multiple grounds, which can cause trouble. I ended up lifting
> > > the ground on one of my serial connections. AFAIK both Ethernet
> > > and USB power supplies are floating, so multiple grounds are very
> > > unlikely. But something might be faulty.
> >
> > The characters look too regular to me, just like a normal terminal
> > codes, not a line noise. I test the device now powered from the
> > same USB hub as the USB-serial converter. Rockchip needs 1500000 bps
> > console, pretty fest.
>
> OK, then let's assume your serial cables & hoods etc. are OK for the
> moment. What does serial console config on the rpi look like?
>
> When I specified the rpi4 serial console speed in the config to match my
> serial terminal server, rather than let it "float" (default 9600), my
> loader interruptions stopped, and no more stray characters on the serial
> console after boot either.
>
> > Also, uboot autoboot prompt never gets interrupted.
> >
> > I also noticed that "resizewin" complains about not getting
> > information about the terminal upon login on the serial console
> > while being in the vt(4) text mode.
> >
> > Looks like the bootloader tries to send/receives some terminal control
> > sequences and this fails, interupting the autoboot.
>
> It may be something along those lines. When I was getting loader stops
> during reboot on my rpi4, my guess was the default FreeBSD speed 9600
> vs. my serial terminal server setting of 115200 was causing stray
> characters on the line during boot, loader interpretted that as a
> keystroke, so it stopped.
>
> Cheers,
> sr.
>
>