From mboxrd@z Thu Jan 1 00:00:00 1970 From: Prarit Bhargava Subject: Re: [PATCH] acpi, spcr: Make SPCR available to x86 Date: Mon, 12 Feb 2018 09:49:47 -0500 Message-ID: <7bd5897f-d6da-7e29-29c4-aa26d24f6355@redhat.com> References: <20180118150951.28964-1-prarit@redhat.com> <20180212133429.GC25314@hirez.programming.kicks-ass.net> <1e69fffc-1c3b-8cc0-f1cb-695de5ccdcb5@redhat.com> <953565bd-436b-c1fe-d3c5-cde731dee83d@codeaurora.org> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <953565bd-436b-c1fe-d3c5-cde731dee83d@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org To: Timur Tabi , Peter Zijlstra 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 , Lv Zheng , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , x86@kernel.org, Jonathan Corbet , Catalin Marinas , Will Deacon , graeme.gregory@linaro.org, mark.salter@redhat.com List-Id: linux-acpi@vger.kernel.org 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. >