From: Peter Zijlstra <peterz@infradead.org>
To: Prarit Bhargava <prarit@redhat.com>
Cc: linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
linux-doc@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-pm@vger.kernel.org, linux-serial@vger.kernel.org,
Bhupesh Sharma <bhsharma@redhat.com>,
Lv Zheng <lv.zheng@intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
x86@kernel.org, Jonathan Corbet <corbet@lwn.net>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Timur Tabi <timur@codeaurora.org>,
graeme.gregory@linaro.org, mark.salter@redhat.com
Subject: Re: [PATCH] acpi, spcr: Make SPCR available to x86
Date: Mon, 12 Feb 2018 15:56:53 +0100 [thread overview]
Message-ID: <20180212145652.GM25181@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <1e69fffc-1c3b-8cc0-f1cb-695de5ccdcb5@redhat.com>
On Mon, Feb 12, 2018 at 08:47:57AM -0500, Prarit Bhargava wrote:
>
>
> On 02/12/2018 08:34 AM, Peter Zijlstra wrote:
> > On Thu, Jan 18, 2018 at 10:09:51AM -0500, Prarit Bhargava wrote:
> >> config ACPI_SPCR_TABLE
> >> + bool "ACPI Serial Port Console Redirection Support"
> >> + default y if X86
> >> + help
> >> + Enable support for Serial Port Console Redirection (SPCR) Table.
> >> + This table provides information about the configuration of the
> >> + earlycon console.
> >
> > I just got asked this by oldconfig, which left me rather puzzled, WTF
> > does this do?
>
> Odd -- I thought I had taken care of that :( My apologies Peter.
>
> 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.
>
> The serial console configuration varies from vendor to vendor. This takes the
> guess-work out of defining a serial console.
But when I specify "earlyprintk=serial,ttyS0,115200" this SPCR crud will
not interfere?
next prev parent reply other threads:[~2018-02-12 14:56 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-18 15:09 [PATCH] acpi, spcr: Make SPCR available to x86 Prarit Bhargava
2018-01-20 14:33 ` Ingo Molnar
2018-01-21 23:21 ` Mark Salter
2018-01-22 21:49 ` Timur Tabi
2018-01-23 12:41 ` Prarit Bhargava
2018-02-12 13:34 ` Peter Zijlstra
2018-02-12 13:47 ` Prarit Bhargava
2018-02-12 14:43 ` Timur Tabi
2018-02-12 14:49 ` Prarit Bhargava
2018-02-12 15:10 ` Timur Tabi
2018-02-12 14:56 ` Peter Zijlstra [this message]
2018-02-12 15:18 ` Prarit Bhargava
2018-02-12 15:44 ` Peter Zijlstra
2018-02-12 15:54 ` Prarit Bhargava
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