linux-kernel - Re: [PATCH] acpi, spcr: Make SPCR available to x86

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Message-ID: <7bd5897f-d6da-7e29-29c4-aa26d24f6355@redhat.com>
Date:   Mon, 12 Feb 2018 09:49:47 -0500
From:   Prarit Bhargava <prarit@...hat.com>
To:     Timur Tabi <timur@...eaurora.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-pm@...r.kernel.org, linux-serial@...r.kernel.org,
        Bhupesh Sharma <bhsharma@...hat.com>,
        Lv Zheng <lv.zheng@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Jonathan Corbet <corbet@....net>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>, graeme.gregory@...aro.org,
        mark.salter@...hat.com
Subject: Re: [PATCH] acpi, spcr: Make SPCR available to x86



On 02/12/2018 09:43 AM, Timur Tabi wrote:
> On 2/12/18 7:47 AM, Prarit Bhargava wrote:
>> ACPI SPCR is used by a vendor to define the serial console for a system.  If
>> SPCR exists a user can add kernel parameter "earlycon" (no extra kernel
>> parameters) and the console will work out-of-the-box.
> 
> "earlycon" is needed only for an *early* console.  You don't need any command
> line parameters for a normal console to work with SPCR.

That's true on ARM64.  I specifically did not enable the console by default on
x86.  There are users who do not want a console active during boot & runtime.

P.

>