[PATCH] acpi, spcr: Make SPCR available to x86
From: peterz@infradead.org (Peter Zijlstra)
Date: 2018-02-12 14:57:13
Also in:
linux-acpi, linux-pm, linux-serial, lkml
On Mon, Feb 12, 2018 at 08:47:57AM -0500, Prarit Bhargava wrote:
On 02/12/2018 08:34 AM, Peter Zijlstra wrote:quoted
On Thu, Jan 18, 2018 at 10:09:51AM -0500, Prarit Bhargava wrote:quoted
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?