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

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Message-ID: <20190328141307.GM22720@zn.tnic>
Date:   Thu, 28 Mar 2019 15:13:07 +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 Thu, Mar 28, 2019 at 04:00:39PM +0200, Andy Shevchenko wrote:
> If it's _non-standard_ serial interface (by meaning of I/O accessors and port
> addresses), user may consider to use this options in case the interface to
> communicate with kernel is serial one and its configuration is done by other
> means (firmware / bootloader / EFI / etc).

And is this non-standard interface out there in the wild or only at
Intel's labs?

Are there boxes like that out there?

If I go to the store and buy a box, how do I know whether that box would
need "nocfg"? Do I look in the BIOS or how do I find out I need to supply
"nocfg"?

> If by BIOS or by other means the serial port is configured

How do I find out that the serial port is configured?

And don't give me that "example" about the typing on keyboard or on
touch screen again.

-- 
Regards/Gruss,
    Boris.

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