linux-kernel - Re: [RFC PATCH -next] tty: serial: add panic serial helper

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Date:   Wed, 17 May 2023 13:56:50 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Hongyu Xie <xiehongyu1@...inos.cn>
Cc:     linux@...linux.org.uk, jirislaby@...nel.org,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        xy521521@...il.com
Subject: Re: [RFC PATCH -next] tty: serial: add panic serial helper

On Wed, May 17, 2023 at 06:14:03PM +0800, Hongyu Xie wrote:
> It works like this:
>     1.Attach the uart side of an USB-to-UART tool to any uart port on your
>     device after panic. Attach the USB side of that tool to another PC.
>     Open minicom(or other app) on that PC, set /dev/ttyUSB0 with
>     "115200 8N1".
> 
>     2.press "Enter", you'll get something like,
> 
>     "
>     wrong password
>     Panic now, please input keyword to debug
>     "
> 
>     3.type "123456" and press "Enter" will prompt a help menu.
>     "
>     help:
>         -a      show all kernel msg
>         -3      show S3 msg
>         -4      show S4 msg
>         -filter-[string]        show msg contains [string]
>         -q-     quit
>     "
> 
>     4.Finally type 'a', '3', '4', 'q' or "filter-xxx" to get what you want.

All of this needs to be documented somewhere, right?

And what is this magic "123456" stuff?

thanks,

greg k-h