linux-kernel - Re: [PATCH v2 7/7] x86/boot: Support nocfg parameter for earlyprintk

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Message-ID: <20190328130317.GG22720@zn.tnic>
Date:   Thu, 28 Mar 2019 14:03:17 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 7/7] x86/boot: Support nocfg parameter for earlyprintk

On Tue, Mar 19, 2019 at 09:43:25PM +0300, Andy Shevchenko wrote:
> If by BIOS or by other means the serial port is configured
> user might want to skip reconfiguration in the boot code.

That needs more explanation: how can that happen? How is the user
supposed to know whether the serial port is configured in order to use
this cmdline param?

Why can't the kernel detect whether the serial port is configured and
not touch that configuration?

A lot of why's and head scratching...

-- 
Regards/Gruss,
    Boris.

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