linux-kernel - SPCR and default serial port

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Message-ID: <364e0ff5da091ed7faa0232302b6181ac30000de.camel@amazon.com>
Date:   Wed, 15 Apr 2020 06:04:02 +0000
From:   "Herrenschmidt, Benjamin" <benh@...zon.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "x86@...nel.org" <x86@...nel.org>
Subject: SPCR and default serial port

Hi !

Today, arm64 allows the serial port specified in ACPI SPCR table to be
selected as a default console, but x86 doesn't (second argument to
acpi_parse_spcr).

I understand while we might have been worried of breaking existing
setups back then but should we re-think this, maybe via a CONFIG option
?

It makes a lot of sense to have firmware tell us which of the
potentially many serial port in a system is our active console, along
with its configuration...

This also shouldn't cause problem on systems that already specify a
console explicitly on the command line.

Any opinion ?

Cheers,
Ben.