linux-kernel - Re: [PATCH] x86/x86_64_defconfig: Enable the serial console

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Date:   Mon, 12 Oct 2020 18:43:08 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Guillaume Tucker <guillaume.tucker@...labora.com>
Cc:     Willy Tarreau <w@....eu>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        Collabora Kernel ML <kernel@...labora.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Diego Elio Pettenò <flameeyes@...meeyes.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        kernelci@...ups.io
Subject: Re: [PATCH] x86/x86_64_defconfig: Enable the serial console

On Mon, Oct 12, 2020 at 04:10:45PM +0100, Guillaume Tucker wrote:
> You can get serial console on recent enough Chromebooks with a
> debug interface such as SuzyQable:
> 
>   https://www.sparkfun.com/products/14746
> 
> It's not a USB Type-C adapter, it has a debug interface which
> works with Chromebooks that support Case-Closed Debugging.
> Anyone can do that without modifying the Chromebook, and with a
> bit of patience to go through the documentation[1]...
> 
> The KernelCI sample results from my previous email were run using
> just that: off-the-shelf Chromebooks + SuzyQ + rebuilt firmware
> for interactive console and tftp boot + kernel with the config
> options in Enric's patch.

That sounds interesting, thanks for elaborating.

At the same time, you see how this setup is very hw-specific and not
really common and those options do not really belong in a defconfig but
in a kernelCI snippet, I'd say.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette