[PATCH 13/13] Nokia RX-51: Enable usbtty serial console by default

[Andy Shevchenko]

On Sun, Nov 29, 2020 at 6:53 PM Pali Rohár <pali at kernel.org> wrote:
>
> Now when usbtty serial console is fixed in U-Boot enable it for Nokia RX-51
> board by default.
>
> CONFIG_CONSOLE_MUX is already used and U-Boot console is available for
> all in/out devices. Therefore there is no need to have separate commands
> 'run sercon', 'run usbcon' and 'run vgacon', so remove them.
>
> As space for U-Boot is limited to 256kB, disable some other unused options
> so CONFIG_USB_TTY can be enabled.
>
> Nokia RX-51 does not have easily accessible UART serial console so the only
> option for easy debugging is to use device's keyboard+screen or this usbtty
> serial console over USB.

I think it's not a good idea to revive usbtty.
I was recently playing around f_serial.c (I can send you the half
baked stuff, which by a lot of twisted code in DWC3 driver is not
working properly, actually almost not working) and I think that would
be the right thing to do.

usbtty quite old, intrusive way of serial console via USB supported
only by outdated hardware (like this Nokia N-900), while f_serial
gotta work on better recent base. And I believe musb should be, if
needed, patched to support composite devices.

So, kinda disagreement from my side as a summary on this.
But disclaimer, I'm not a maintainer here, just my 2 cents.




-- 
With Best Regards,
Andy Shevchenko