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

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Date:   Mon, 12 Feb 2018 08:43:45 -0600
From:   Timur Tabi <timur@...eaurora.org>
To:     Prarit Bhargava <prarit@...hat.com>,
        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 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.

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