How to see runtime log on Rpi3 B+

kimberly nNA eft823177 at gmail.com
Sat Jul 20 16:52:41 CEST 2019


Dear Tomasz,

Apologies for the delay in getting back to you.
I appreciate your efforts.
Thanks so much for your help.
I can see the runtime log on Rpi3 B+ !

Thanks Alexander Weidinger for his help.
Adding the three lines on config.txt will work !

I didn't use u-boot, I just used bootcode.bin (rpi website provided).

Now, I could go ahead to do experimenting with Rpi 3 B+
But recently I faced some problems. It's about how to write the system
configuration.
Although I tried to solve it according to the runtime logs, finally I still
failed...
I wrote a new letter. The title was "Can QT-based "textedit" run
successfully on Rpi 3 B+ ?"

Thank you. 😊



Tomasz Gajewski <tomga at wp.pl> 於 2019年7月5日 週五 下午7:50寫道:

> kimberly nNA <eft823177 at gmail.com> writes:
>
> Hi,
>
> > I modified and added some apps on demo.run
> > The genode version is
> https://github.com/tomga/genode/tree/rpi3bplus_19.02
>
> It's great that someone tries to use this :-).
>
> > I tried this commands :
> > $ ./tool/create_builddir rpi3bplus
> > $ make run/demo KERNEL=hw
> > This case successfully run on Rpi3 B+
>
> It's even more great to hear that it is working.
>
> > But I couldn't see the runtime log like as on x86_64 :
> >
> ----------------------------------------------------------------------------------
> > ...
> > [init -> drivers] Error: Could not open ROM session for "config"
> > [init -> drivers] Error: Uncaught exception of type
> 'Genode::Rom_connection::Rom_connection_failed'
> > [init -> drivers] Warning: abort called - thread: ep
> > [init] child "drivers" exited with exit value 1
> > [init -> acpi_drv] Found MADT
> > ...
> >
> -----------------------------------------------------------------------------------
> > Like the above example, sometimes I want to debug errors on Rpi.
> > Can I see the runtime log on Rpi3 B+ ?
> > If it can, how to set on putty ? (p.s. I used USB to TTL Serial Cable)
>
> Some time ago Alexander Weidinger wrote on this list that it is
> important to have in config.txt following:
>
>    enable_uart=1
>    init_uart_baud=115200
>    init_uart_clock=3000000
>
> and that last line is really important. I haven't really checked if it
> works without it but definitely works with. Maybe it is the missing
> part?
>
> If you use u-boot you should see some logs from it first. Do you use it
> and see logs?
>
> > In putty configuration :
> > serial line : /dev/ttyUSB0
> > speed : 115200
>
> 115200 should work.
>
> > I also tried speed : 9600
> > But I still couldn't see runtime log.
> >
> > Maybe I have to refer to gpio_signal.run and then modify demo.run ?
>
> I've never tested gpio_signal.run yet but for testing UART you should
> probably start with run/log instead of run/demo. It's much smaller.
>
> Some time ago I've started to write my first article to genodians.org
> documenting all steps I've done to configure booting on RPI. Your
> problem gives me motivation to finish it. I don't promise, but I'll try
> to finish it in next few days.
>
> Tomasz
>
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